Batch of 9 new shapes examples!

Some examples included in this batch require the included libraries: `easings.h` and `raygui.h`. Examples included:

 - shapes_bouncing_ball
 - shapes_collision_area
 - shapes_following_eyes
 - shapes_draw_circle_sector (requires raygui.h)
 - shapes_draw_rectangle_rounded (requires raygui.h)
 - shapes_draw_ring (requires raygui.h)
 - shapes_easings_ball_anim (requires easings.h)
 - shapes_easings_box_anim (requires easings.h)
 - shapes_easings_rectangle_array (requires easings.h)

examples/shapes/easings.h

@@ -0,0 +1,257 @@
+/*******************************************************************************************
+*
+*   raylib easings (header only file)
+*   
+*   Useful easing functions for values animation
+*
+*   This header uses:
+*       #define EASINGS_STATIC_INLINE       // Inlines all functions code, so it runs faster.
+*                                           // This requires lots of memory on system.
+*   How to use:
+*   The four inputs t,b,c,d are defined as follows:
+*   t = current time (in any unit measure, but same unit as duration)
+*   b = starting value to interpolate
+*   c = the total change in value of b that needs to occur
+*   d = total time it should take to complete (duration)
+*
+*   Example:
+*
+*   int currentTime = 0;
+*   int duration = 100;
+*   float startPositionX = 0.0f;
+*   float finalPositionX = 30.0f;
+*   float currentPositionX = startPositionX;
+*
+*   while (currentPositionX < finalPositionX)
+*   {
+*       currentPositionX = EaseSineIn(currentTime, startPositionX, finalPositionX - startPositionX, duration);
+*       currentTime++;
+*   }
+*
+*   A port of Robert Penner's easing equations to C (http://robertpenner.com/easing/)
+*
+*   Robert Penner License
+*   ---------------------------------------------------------------------------------
+*   Open source under the BSD License. 
+*
+*   Copyright (c) 2001 Robert Penner. All rights reserved.
+*
+*   Redistribution and use in source and binary forms, with or without modification, 
+*   are permitted provided that the following conditions are met:
+*
+*       - Redistributions of source code must retain the above copyright notice, 
+*         this list of conditions and the following disclaimer.
+*       - Redistributions in binary form must reproduce the above copyright notice, 
+*         this list of conditions and the following disclaimer in the documentation 
+*         and/or other materials provided with the distribution.
+*       - Neither the name of the author nor the names of contributors may be used 
+*         to endorse or promote products derived from this software without specific 
+*         prior written permission.
+*
+*   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
+*   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+*   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+*   IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+*   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+*   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+*   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
+*   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
+*   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
+*   OF THE POSSIBILITY OF SUCH DAMAGE.
+*   ---------------------------------------------------------------------------------
+*
+*   Copyright (c) 2015 Ramon Santamaria
+*
+*   This software is provided "as-is", without any express or implied warranty. In no event
+*   will the authors be held liable for any damages arising from the use of this software.
+*
+*   Permission is granted to anyone to use this software for any purpose, including commercial
+*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
+*
+*     1. The origin of this software must not be misrepresented; you must not claim that you
+*     wrote the original software. If you use this software in a product, an acknowledgment
+*     in the product documentation would be appreciated but is not required.
+*
+*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
+*     as being the original software.
+*
+*     3. This notice may not be removed or altered from any source distribution.
+*
+**********************************************************************************************/
+
+#ifndef EASINGS_H
+#define EASINGS_H
+
+#define EASINGS_STATIC_INLINE     // NOTE: By default, compile functions as static inline
+
+#if defined(EASINGS_STATIC_INLINE)
+    #define EASEDEF static inline
+#else
+    #define EASEDEF extern
+#endif
+
+#include <math.h>       // Required for: sin(), cos(), sqrt(), pow()
+
+#ifndef PI
+    #define PI 3.14159265358979323846f //Required as PI is not always defined in math.h
+#endif
+
+#ifdef __cplusplus
+extern "C" {            // Prevents name mangling of functions
+#endif
+
+// Linear Easing functions
+EASEDEF float EaseLinearNone(float t, float b, float c, float d) { return (c*t/d + b); }
+EASEDEF float EaseLinearIn(float t, float b, float c, float d) { return (c*t/d + b); }
+EASEDEF float EaseLinearOut(float t, float b, float c, float d) { return (c*t/d + b); }
+EASEDEF float EaseLinearInOut(float t,float b, float c, float d) { return (c*t/d + b); }
+
+// Sine Easing functions
+EASEDEF float EaseSineIn(float t, float b, float c, float d) { return (-c*cos(t/d*(PI/2)) + c + b); }
+EASEDEF float EaseSineOut(float t, float b, float c, float d) { return (c*sin(t/d*(PI/2)) + b); }
+EASEDEF float EaseSineInOut(float t, float b, float c, float d) { return (-c/2*(cos(PI*t/d) - 1) + b); }
+
+// Circular Easing functions
+EASEDEF float EaseCircIn(float t, float b, float c, float d) { return (-c*(sqrt(1 - (t/=d)*t) - 1) + b); }
+EASEDEF float EaseCircOut(float t, float b, float c, float d) { return (c*sqrt(1 - (t=t/d-1)*t) + b); }
+EASEDEF float EaseCircInOut(float t, float b, float c, float d) 
+{
+    if ((t/=d/2) < 1) return (-c/2*(sqrt(1 - t*t) - 1) + b);
+    return (c/2*(sqrt(1 - t*(t-=2)) + 1) + b);
+}
+
+// Cubic Easing functions
+EASEDEF float EaseCubicIn(float t, float b, float c, float d) { return (c*(t/=d)*t*t + b); }
+EASEDEF float EaseCubicOut(float t, float b, float c, float d) { return (c*((t=t/d-1)*t*t + 1) + b); }
+EASEDEF float EaseCubicInOut(float t, float b, float c, float d) 
+{ 
+    if ((t/=d/2) < 1) return (c/2*t*t*t + b);
+    return (c/2*((t-=2)*t*t + 2) + b);
+}
+
+// Quadratic Easing functions
+EASEDEF float EaseQuadIn(float t, float b, float c, float d) { return (c*(t/=d)*t + b); }
+EASEDEF float EaseQuadOut(float t, float b, float c, float d) { return (-c*(t/=d)*(t-2) + b); }
+EASEDEF float EaseQuadInOut(float t, float b, float c, float d) 
+{
+    if ((t/=d/2) < 1) return (((c/2)*(t*t)) + b);
+    return (-c/2*(((t-2)*(--t)) - 1) + b);
+}
+
+// Exponential Easing functions
+EASEDEF float EaseExpoIn(float t, float b, float c, float d) { return (t == 0) ? b : (c*pow(2, 10*(t/d - 1)) + b); }
+EASEDEF float EaseExpoOut(float t, float b, float c, float d) { return (t == d) ? (b + c) : (c*(-pow(2, -10*t/d) + 1) + b);    }
+EASEDEF float EaseExpoInOut(float t, float b, float c, float d) 
+{
+    if (t == 0) return b;
+    if (t == d) return (b + c);
+    if ((t/=d/2) < 1) return (c/2*pow(2, 10*(t - 1)) + b);
+    
+    return (c/2*(-pow(2, -10*--t) + 2) + b);
+}
+
+// Back Easing functions
+EASEDEF float EaseBackIn(float t, float b, float c, float d) 
+{
+    float s = 1.70158f;
+    float postFix = t/=d;
+    return (c*(postFix)*t*((s + 1)*t - s) + b);
+}
+
+EASEDEF float EaseBackOut(float t, float b, float c, float d)
+{    
+    float s = 1.70158f;
+    return (c*((t=t/d-1)*t*((s + 1)*t + s) + 1) + b);
+}
+
+EASEDEF float EaseBackInOut(float t, float b, float c, float d)
+{
+    float s = 1.70158f;
+    if ((t/=d/2) < 1) return (c/2*(t*t*(((s*=(1.525f)) + 1)*t - s)) + b);
+    
+    float postFix = t-=2;
+    return (c/2*((postFix)*t*(((s*=(1.525f)) + 1)*t + s) + 2) + b);
+}
+
+// Bounce Easing functions
+EASEDEF float EaseBounceOut(float t, float b, float c, float d) 
+{
+    if ((t/=d) < (1/2.75f)) 
+    {
+        return (c*(7.5625f*t*t) + b);
+    } 
+    else if (t < (2/2.75f)) 
+    {
+        float postFix = t-=(1.5f/2.75f);
+        return (c*(7.5625f*(postFix)*t + 0.75f) + b);
+    } 
+    else if (t < (2.5/2.75)) 
+    {
+        float postFix = t-=(2.25f/2.75f);
+        return (c*(7.5625f*(postFix)*t + 0.9375f) + b);
+    } 
+    else 
+    {
+        float postFix = t-=(2.625f/2.75f);
+        return (c*(7.5625f*(postFix)*t + 0.984375f) + b);
+    }
+}
+
+EASEDEF float EaseBounceIn(float t, float b, float c, float d) { return (c - EaseBounceOut(d-t, 0, c, d) + b); }
+EASEDEF float EaseBounceInOut(float t, float b, float c, float d) 
+{
+    if (t < d/2) return (EaseBounceIn(t*2, 0, c, d)*0.5f + b);
+    else return (EaseBounceOut(t*2-d, 0, c, d)*0.5f + c*0.5f + b);
+}
+
+// Elastic Easing functions
+EASEDEF float EaseElasticIn(float t, float b, float c, float d) 
+{
+    if (t == 0) return b;
+    if ((t/=d) == 1) return (b + c);
+    
+    float p = d*0.3f;
+    float a = c; 
+    float s = p/4;
+    float postFix = a*pow(2, 10*(t-=1));
+    
+    return (-(postFix*sin((t*d-s)*(2*PI)/p )) + b);
+}
+
+EASEDEF float EaseElasticOut(float t, float b, float c, float d)
+{
+    if (t == 0) return b;
+    if ((t/=d) == 1) return (b + c);
+    
+    float p = d*0.3f;
+    float a = c; 
+    float s = p/4;
+    
+    return (a*pow(2,-10*t)*sin((t*d-s)*(2*PI)/p) + c + b);    
+}
+
+EASEDEF float EaseElasticInOut(float t, float b, float c, float d)
+{
+    if (t == 0) return b;
+    if ((t/=d/2) == 2) return (b + c);
+    
+    float p = d*(0.3f*1.5f);
+    float a = c;
+    float s = p/4;
+
+    if (t < 1) 
+    {
+        float postFix = a*pow(2, 10*(t-=1));
+        return -0.5f*(postFix*sin((t*d-s)*(2*PI)/p)) + b;
+    }
+    
+    float postFix = a*pow(2, -10*(t-=1));
+    
+    return (postFix*sin((t*d-s)*(2*PI)/p)*0.5f + c + b);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // EASINGS_H

examples/shapes/shapes_bouncing_ball.c

@@ -0,0 +1,76 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - bouncing ball
+*
+*   This example has been created using raylib 1.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2013 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+int main()
+{
+    // Initialization
+    //---------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+    
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - bouncing ball");
+    
+	Vector2 ballPosition = { GetScreenWidth()/2, GetScreenHeight()/2 };
+	Vector2 ballSpeed = { 5.0f, 4.0f };
+	int ballRadius = 20;
+    
+    bool pause = 0;
+    int framesCounter = 0;
+
+    SetTargetFPS(60);
+    //----------------------------------------------------------
+    
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //-----------------------------------------------------
+        if (IsKeyPressed(KEY_SPACE)) pause = !pause;
+        
+        if (!pause)
+        {
+            ballPosition.x += ballSpeed.x;
+            ballPosition.y += ballSpeed.y;
+            
+            // Check walls collision for bouncing
+            if ((ballPosition.x >= (GetScreenWidth() - ballRadius)) || (ballPosition.x <= ballRadius)) ballSpeed.x *= -1.0f;
+            if ((ballPosition.y >= (GetScreenHeight() - ballRadius)) || (ballPosition.y <= ballRadius)) ballSpeed.y *= -1.0f;
+        }
+        else framesCounter++;
+        //-----------------------------------------------------
+        
+        // Draw
+        //-----------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+            
+            DrawCircleV(ballPosition, ballRadius, MAROON);
+            DrawText("PRESS SPACE to PAUSE BALL MOVEMENT", 10, GetScreenHeight() - 25, 20, LIGHTGRAY);
+            
+            // On pause, we draw a blinking message
+            if (pause && ((framesCounter/30)%2)) DrawText("PAUSED", 350, 200, 30, GRAY);
+
+            DrawFPS(10, 10);
+        
+        EndDrawing();
+        //-----------------------------------------------------
+    }
+
+    // De-Initialization
+    //---------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //----------------------------------------------------------
+    
+    return 0;
+}

examples/shapes/shapes_collision_area.c

@@ -0,0 +1,108 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - collision area
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2013-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include <stdlib.h>     // Required for abs()
+
+int main()
+{
+    // Initialization
+    //---------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - collision area");
+    
+    // Box A: Moving box
+    Rectangle boxA = { 10, GetScreenHeight()/2 - 50, 200, 100 };
+	int boxASpeedX = 4;
+	
+    // Box B: Mouse moved box
+    Rectangle boxB = { GetScreenWidth()/2 - 30, GetScreenHeight()/2 - 30, 60, 60 };
+    
+    Rectangle boxCollision = { 0 };       // Collision rectangle
+    
+    int screenUpperLimit = 40;      // Top menu limits
+    
+	bool pause = false;             // Movement pause
+	bool collision = false;         // Collision detection
+    
+    SetTargetFPS(60);
+    //----------------------------------------------------------
+    
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //-----------------------------------------------------
+        // Move box if not paused
+		if (!pause) boxA.x += boxASpeedX;
+        
+        // Bounce box on x screen limits
+		if (((boxA.x + boxA.width) >= GetScreenWidth()) || (boxA.x <= 0)) boxASpeedX *= -1;
+		
+		// Update player-controlled-box (box02)
+		boxB.x = GetMouseX() - boxB.width/2;
+		boxB.y = GetMouseY() - boxB.height/2;
+		
+        // Make sure Box B does not go out of move area limits
+		if ((boxB.x + boxB.width) >= GetScreenWidth()) boxB.x = GetScreenWidth() - boxB.width;
+		else if (boxB.x <= 0) boxB.x = 0;
+		
+		if ((boxB.y + boxB.height) >= GetScreenHeight()) boxB.y = GetScreenHeight() - boxB.height;
+		else if (boxB.y <= screenUpperLimit) boxB.y = screenUpperLimit;
+        
+        // Check boxes collision
+        collision = CheckCollisionRecs(boxA, boxB);
+		
+		// Get collision rectangle (only on collision)
+		if (collision) boxCollision = GetCollisionRec(boxA, boxB);
+		
+        // Pause Box A movement
+		if (IsKeyPressed(KEY_SPACE)) pause = !pause;
+        //-----------------------------------------------------
+        
+        // Draw
+        //-----------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+            
+            DrawRectangle(0, 0, screenWidth, screenUpperLimit, collision? RED : BLACK);
+
+            DrawRectangleRec(boxA, GOLD);
+            DrawRectangleRec(boxB, BLUE);
+            
+            if (collision)
+            {
+                // Draw collision area
+                DrawRectangleRec(boxCollision, LIME);
+                
+                // Draw collision message
+                DrawText("COLLISION!", GetScreenWidth()/2 - MeasureText("COLLISION!", 20)/2, screenUpperLimit/2 - 10, 20, BLACK);
+                
+                // Draw collision area
+                DrawText(FormatText("Collision Area: %i", (int)boxCollision.width*(int)boxCollision.height), GetScreenWidth()/2 - 100, screenUpperLimit + 10, 20, BLACK);
+            }     
+
+            DrawFPS(10, 10);
+        
+        EndDrawing();
+        //-----------------------------------------------------
+    }
+
+    // De-Initialization
+    //---------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //----------------------------------------------------------
+    
+    return 0;
+}

examples/shapes/shapes_draw_circle_sector.c

@@ -0,0 +1,79 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - draw circle sector (with gui options)
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Vlad Adrian (@Demizdor) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include <raylib.h>
+
+#define RAYGUI_IMPLEMENTATION
+#include "raygui.h"                 // Required for GUI controls
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - draw circle sector");
+
+    Vector2 center = {(GetScreenWidth() - 300)/2, GetScreenHeight()/2 };
+
+    float outerRadius = 180.f;
+    int startAngle = 0;
+    int endAngle = 180;
+    int segments = 0;
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        // NOTE: All variables update happens inside GUI control functions
+        //----------------------------------------------------------------------------------
+        
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+        
+            DrawLine(500, 0, 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.6f));
+            DrawRectangle(500, 0, GetScreenWidth() - 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.3f));
+
+            DrawCircleSector(center, outerRadius, startAngle, endAngle, segments, Fade(MAROON, 0.3));
+            DrawCircleSectorLines(center, outerRadius, startAngle, endAngle, segments, Fade(MAROON, 0.6));
+            
+            // Draw GUI controls
+            //------------------------------------------------------------------------------
+            startAngle = GuiSliderBar((Rectangle){ 600, 40, 120, 20}, "StartAngle", startAngle, 0, 720, true );
+            endAngle = GuiSliderBar((Rectangle){ 600, 70, 120, 20}, "EndAngle", endAngle, 0, 720, true);
+            
+            outerRadius = GuiSliderBar((Rectangle){ 600, 140, 120, 20}, "Radius", outerRadius, 0, 200, true);
+            segments = GuiSliderBar((Rectangle){ 600, 170, 120, 20}, "Segments", segments, 0, 100, true);
+            //------------------------------------------------------------------------------
+            
+            DrawText(FormatText("MODE: %s", (segments >= 4)? "MANUAL" : "AUTO"), 600, 200, 10, (segments >= 4)? MAROON : DARKGRAY);
+            
+            DrawFPS(10, 10);
+            
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------  
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_draw_rectangle_rounded.c

@@ -0,0 +1,87 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - draw rectangle rounded (with gui options)
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Vlad Adrian (@Demizdor) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include <raylib.h>
+
+#define RAYGUI_IMPLEMENTATION
+#include "raygui.h"                 // Required for GUI controls
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - draw rectangle rounded");
+
+    float roundness = 0.2f;
+    int width = 200;
+    int height = 100;
+    int segments = 0;
+    int lineThick = 1;
+    
+    bool drawRect = false;
+    bool drawRoundedRect = true;
+    bool drawRoundedLines = false;
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        Rectangle rec = { (GetScreenWidth() - width - 250)/2, (GetScreenHeight() - height)/2, width, height };
+        //----------------------------------------------------------------------------------
+        
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+        
+            DrawLine(560, 0, 560, GetScreenHeight(), Fade(LIGHTGRAY, 0.6f));
+            DrawRectangle(560, 0, GetScreenWidth() - 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.3f));
+
+            if (drawRect) DrawRectangleRec(rec, Fade(GOLD, 0.6));
+            if (drawRoundedRect) DrawRectangleRounded(rec, roundness, segments, Fade(MAROON, 0.2));
+            if (drawRoundedLines) DrawRectangleRoundedLines(rec,roundness, segments, lineThick, Fade(MAROON, 0.4));
+        
+            // Draw GUI controls
+            //------------------------------------------------------------------------------
+            width = GuiSliderBar((Rectangle){ 640, 40, 105, 20 }, "Width", width, 0, GetScreenWidth() - 300, true );
+            height = GuiSliderBar((Rectangle){ 640, 70, 105, 20 }, "Height", height, 0, GetScreenHeight() - 50, true);
+            roundness = GuiSliderBar((Rectangle){ 640, 140, 105, 20 }, "Roundness", roundness, 0.0f, 1.0f, true);
+            lineThick = GuiSliderBar((Rectangle){ 640, 170, 105, 20 }, "Thickness", lineThick, 0, 20, true);
+            segments = GuiSliderBar((Rectangle){ 640, 240, 105, 20}, "Segments", segments, 0, 60, true);
+            
+            drawRoundedRect = GuiCheckBox((Rectangle){ 640, 320, 20, 20 }, "DrawRoundedRect", drawRoundedRect);
+            drawRoundedLines = GuiCheckBox((Rectangle){ 640, 350, 20, 20 }, "DrawRoundedLines", drawRoundedLines);
+            drawRect = GuiCheckBox((Rectangle){ 640, 380, 20, 20}, "DrawRect", drawRect);
+            //------------------------------------------------------------------------------
+            
+            DrawText(FormatText("MODE: %s", (segments >= 4)? "MANUAL" : "AUTO"), 640, 280, 10, (segments >= 4)? MAROON : DARKGRAY);
+            
+            DrawFPS(10, 10);
+            
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------  
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_draw_ring.c

@@ -0,0 +1,92 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - draw ring (with gui options)
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Vlad Adrian (@Demizdor) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include <raylib.h>
+
+#define RAYGUI_IMPLEMENTATION
+#include "raygui.h"                 // Required for GUI controls
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - draw ring");
+
+    Vector2 center = {(GetScreenWidth() - 300)/2, GetScreenHeight()/2 };
+
+    float innerRadius = 80.0f;
+    float outerRadius = 190.0f;
+    
+    int startAngle = 0;
+    int endAngle = 360;
+    int segments = 0;
+    
+    bool drawRing = true;
+    bool drawRingLines = false;
+    bool drawCircleLines = false;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        // NOTE: All variables update happens inside GUI control functions
+        //----------------------------------------------------------------------------------
+        
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+        
+            ClearBackground(RAYWHITE);
+            
+            DrawLine(500, 0, 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.6f));
+            DrawRectangle(500, 0, GetScreenWidth() - 500, GetScreenHeight(), Fade(LIGHTGRAY, 0.3f));
+
+            if (drawRing) DrawRing(center, innerRadius, outerRadius, startAngle, endAngle, segments, Fade(MAROON, 0.3));
+            if (drawRingLines) DrawRingLines(center, innerRadius, outerRadius, startAngle, endAngle, segments, Fade(BLACK, 0.4));
+            if (drawCircleLines) DrawCircleSectorLines(center, outerRadius, startAngle, endAngle, segments, Fade(BLACK, 0.4));
+
+            // Draw GUI controls
+            //------------------------------------------------------------------------------
+            startAngle = GuiSliderBar((Rectangle){ 600, 40, 120, 20 }, "StartAngle", startAngle, -450, 450, true);
+            endAngle = GuiSliderBar((Rectangle){ 600, 70, 120, 20 }, "EndAngle", endAngle, -450, 450, true);
+            
+            innerRadius = GuiSliderBar((Rectangle){ 600, 140, 120, 20 }, "InnerRadius", innerRadius, 0, 100, true);
+            outerRadius = GuiSliderBar((Rectangle){ 600, 170, 120, 20 }, "OuterRadius", outerRadius, 0, 200, true);
+            
+            segments = GuiSliderBar((Rectangle){ 600, 240, 120, 20 }, "Segments", segments, 0, 100, true);
+            
+            drawRing = GuiCheckBox((Rectangle){ 600, 320, 20, 20 }, "Draw Ring", drawRing);
+            drawRingLines = GuiCheckBox((Rectangle){ 600, 350, 20, 20 }, "Draw RingLines", drawRingLines);
+            drawCircleLines = GuiCheckBox((Rectangle){ 600, 380, 20, 20 }, "Draw CircleLines", drawCircleLines);
+            //------------------------------------------------------------------------------
+            
+            DrawText(FormatText("MODE: %s", (segments >= 4)? "MANUAL" : "AUTO"), 600, 270, 10, (segments >= 4)? MAROON : DARKGRAY);
+            
+            DrawFPS(10, 10);
+            
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------  
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_easing_box_anim.c

@@ -0,0 +1,136 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - easings box anim
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include "easings.h"            // Required for easing functions
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings box anim");
+    
+    // Box variables to be animated with easings
+    Rectangle rec = { GetScreenWidth()/2, -100, 100, 100 };
+    float rotation = 0.0f;
+    float alpha = 1.0f;
+    
+    int state = 0;
+    int framesCounter = 0;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        switch (state)
+        {
+            case 0:     // Move box down to center of screen
+            {
+                framesCounter++;
+                
+                // NOTE: Remember that 3rd parameter of easing function refers to
+                // desired value variation, do not confuse it with expected final value!
+                rec.y = EaseElasticOut(framesCounter, -100, GetScreenHeight()/2 + 100, 120);
+
+                if (framesCounter >= 120) 
+                {
+                    framesCounter = 0;
+                    state = 1;
+                }
+            } break;
+            case 1:     // Scale box to an horizontal bar
+            {
+                framesCounter++;
+                rec.height = EaseBounceOut(framesCounter, 100, -90, 120);
+                rec.width = EaseBounceOut(framesCounter, 100, GetScreenWidth(), 120);
+                
+                if (framesCounter >= 120) 
+                {
+                    framesCounter = 0;
+                    state = 2;
+                }
+            } break;
+            case 2:     // Rotate horizontal bar rectangle
+            {
+                framesCounter++;
+                rotation = EaseQuadOut(framesCounter, 0.0f, 270.0f, 240);
+                
+                if (framesCounter >= 240) 
+                {
+                    framesCounter = 0;
+                    state = 3;
+                }
+            } break;
+            case 3:     // Increase bar size to fill all screen
+            {
+                framesCounter++;
+                rec.height = EaseCircOut(framesCounter, 10, GetScreenWidth(), 120);
+                
+                if (framesCounter >= 120) 
+                {
+                    framesCounter = 0;
+                    state = 4;
+                }
+            } break;
+            case 4:     // Fade out animation
+            {
+                framesCounter++;
+                alpha = EaseSineOut(framesCounter, 1.0f, -1.0f, 160);
+                
+                if (framesCounter >= 160)
+                {
+                    framesCounter = 0;
+                    state = 5;
+                }
+            } break;
+            default: break;
+        }
+        
+        // Reset animation at any moment
+        if (IsKeyPressed(KEY_SPACE))
+        {
+            rec = (Rectangle){ GetScreenWidth()/2, -100, 100, 100 };
+            rotation = 0.0f;
+            alpha = 1.0f;
+            state = 0;
+            framesCounter = 0;
+        }
+        //----------------------------------------------------------------------------------
+        
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            DrawRectanglePro(rec, (Vector2){ rec.width/2, rec.height/2 }, rotation, Fade(BLACK, alpha));
+            
+            DrawText("PRESS [SPACE] TO RESET BOX ANIMATION!", 10, GetScreenHeight() - 25, 20, LIGHTGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------  
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_easings_ball_anim.c

@@ -0,0 +1,110 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - easings ball anim
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include "easings.h"            // Required for easing functions
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings ball anim");
+    
+    // Ball variable value to be animated with easings
+    int ballPositionX = -100;
+    int ballRadius = 20;
+    float ballAlpha = 0.0f;
+    
+    int state = 0;
+    int framesCounter = 0;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (state == 0)             // Move ball position X with easing
+        {
+            framesCounter++;
+            ballPositionX = EaseElasticOut(framesCounter, -100, screenWidth/2 + 100, 120);
+            
+            if (framesCounter >= 120)
+            {
+                framesCounter = 0;
+                state = 1;
+            }
+        }
+        else if (state == 1)        // Increase ball radius with easing
+        {
+            framesCounter++;
+            ballRadius = EaseElasticIn(framesCounter, 20, 500, 200);
+            
+            if (framesCounter >= 200)
+            {
+                framesCounter = 0;
+                state = 2;
+            }
+        }
+        else if (state == 2)        // Change ball alpha with easing (background color blending)
+        {
+            framesCounter++;
+            ballAlpha = EaseCubicOut(framesCounter, 0.0f, 1.0f, 200);
+            
+            if (framesCounter >= 200)
+            {
+                framesCounter = 0;
+                state = 3;
+            }
+        }
+        else if (state == 3)        // Reset state to play again
+        {
+            if (IsKeyPressed(KEY_ENTER)) 
+            {
+                // Reset required variables to play again
+                ballPositionX = -100;
+                ballRadius = 20;
+                ballAlpha = 0.0f;
+                state = 0;
+            }
+        }
+        
+        if (IsKeyPressed(KEY_R)) framesCounter = 0;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            if (state >= 2) DrawRectangle(0, 0, screenWidth, screenHeight, GREEN);
+            DrawCircle(ballPositionX, 200, ballRadius, Fade(RED, 1.0f - ballAlpha));
+            
+            if (state == 3) DrawText("PRESS [ENTER] TO PLAY AGAIN!", 240, 200, 20, BLACK);
+            
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------   
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_easings_rectangle_array.c

@@ -0,0 +1,118 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - easings rectangle array
+*
+*   NOTE: This example requires 'easings.h' library, provided on raylib/src. Just copy 
+*   the library to same directory as example or make sure it's available on include path.
+*
+*   This example has been created using raylib 2.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include "easings.h"            // Required for easing functions
+
+#define RECS_WIDTH              50
+#define RECS_HEIGHT             50
+
+#define MAX_RECS_X              800/RECS_WIDTH
+#define MAX_RECS_Y              450/RECS_HEIGHT
+
+#define PLAY_TIME_IN_FRAMES     240                 // At 60 fps = 4 seconds
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings rectangle array");
+    
+    Rectangle recs[MAX_RECS_X*MAX_RECS_Y];
+    
+    for (int y = 0; y < MAX_RECS_Y; y++)
+    {
+        for (int x = 0; x < MAX_RECS_X; x++)
+        {
+            recs[y*MAX_RECS_X + x].x = RECS_WIDTH/2 + RECS_WIDTH*x;
+            recs[y*MAX_RECS_X + x].y = RECS_HEIGHT/2 + RECS_HEIGHT*y;
+            recs[y*MAX_RECS_X + x].width = RECS_WIDTH;
+            recs[y*MAX_RECS_X + x].height = RECS_HEIGHT;
+        }
+    }
+    
+    float rotation = 0.0f;
+    int framesCounter = 0;
+    int state = 0;                  // Rectangles animation state: 0-Playing, 1-Finished 
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (state == 0)
+        {
+            framesCounter++;
+
+            for (int i = 0; i < MAX_RECS_X*MAX_RECS_Y; i++) 
+            {
+                recs[i].height = EaseCircOut(framesCounter, RECS_HEIGHT, -RECS_HEIGHT, PLAY_TIME_IN_FRAMES);
+                recs[i].width = EaseCircOut(framesCounter, RECS_WIDTH, -RECS_WIDTH, PLAY_TIME_IN_FRAMES);
+                
+                if (recs[i].height < 0) recs[i].height = 0;
+                if (recs[i].width < 0) recs[i].width = 0;
+                
+                if ((recs[i].height == 0) && (recs[i].width == 0)) state = 1;   // Finish playing
+                
+                rotation = EaseLinearIn(framesCounter, 0.0f, 360.0f, PLAY_TIME_IN_FRAMES);
+            }
+        }
+        else if ((state == 1) && IsKeyPressed(KEY_SPACE))
+        {
+            // When animation has finished, press space to restart
+            framesCounter = 0;
+            
+            for (int i = 0; i < MAX_RECS_X*MAX_RECS_Y; i++) 
+            {
+                recs[i].height = RECS_HEIGHT;
+                recs[i].width = RECS_WIDTH;
+            }
+            
+            state = 0;
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            if (state == 0)
+            {
+                for (int i = 0; i < MAX_RECS_X*MAX_RECS_Y; i++)
+                {
+                    DrawRectanglePro(recs[i], (Vector2){ recs[i].width/2, recs[i].height/2 }, rotation, RED);
+                }
+            }
+            else if (state == 1) DrawText("PRESS [SPACE] TO PLAY AGAIN!", 240, 200, 20, GRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------   
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

examples/shapes/shapes_following_eyes.c

@@ -0,0 +1,104 @@
+/*******************************************************************************************
+*
+*   raylib [shapes] example - following eyes
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2013-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include <math.h>       // Required for: atan2f()
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - following eyes");
+    
+    Vector2 scleraLeftPosition = { GetScreenWidth()/2 - 100, GetScreenHeight()/2 };
+    Vector2 scleraRightPosition = { GetScreenWidth()/2 + 100, GetScreenHeight()/2 };
+    float scleraRadius = 80;
+    
+    Vector2 irisLeftPosition = { GetScreenWidth()/2 - 100, GetScreenHeight()/2 };
+    Vector2 irisRightPosition = { GetScreenWidth()/2 + 100, GetScreenHeight()/2};
+    float irisRadius = 24;
+   
+    float angle;  
+    float dx, dy, dxx, dyy; 
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        irisLeftPosition = GetMousePosition();
+        irisRightPosition = GetMousePosition();
+        
+        // Check not inside the left eye sclera
+        if (!CheckCollisionPointCircle(irisLeftPosition, scleraLeftPosition, scleraRadius - 20))
+        {
+            dx = irisLeftPosition.x - scleraLeftPosition.x;
+            dy = irisLeftPosition.y - scleraLeftPosition.y;
+        
+            angle = atan2f(dy, dx);
+
+            dxx = (scleraRadius - irisRadius)*cosf(angle);
+            dyy = (scleraRadius - irisRadius)*sinf(angle);
+
+            irisLeftPosition.x = scleraLeftPosition.x + dxx;
+            irisLeftPosition.y = scleraLeftPosition.y + dyy;
+        }
+
+        // Check not inside the right eye sclera
+        if (!CheckCollisionPointCircle(irisRightPosition, scleraRightPosition, scleraRadius - 20))
+        {
+            dx = irisRightPosition.x - scleraRightPosition.x;
+            dy = irisRightPosition.y - scleraRightPosition.y;
+        
+            angle = atan2f(dy, dx);
+
+            dxx = (scleraRadius - irisRadius)*cosf(angle);
+            dyy = (scleraRadius - irisRadius)*sinf(angle);
+
+            irisRightPosition.x = scleraRightPosition.x + dxx;
+            irisRightPosition.y = scleraRightPosition.y + dyy;
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            DrawCircleV(scleraLeftPosition, scleraRadius, LIGHTGRAY);
+            DrawCircleV(irisLeftPosition, irisRadius, BROWN);
+            DrawCircleV(irisLeftPosition, 10, BLACK);
+            
+            DrawCircleV(scleraRightPosition, scleraRadius, LIGHTGRAY);
+            DrawCircleV(irisRightPosition, irisRadius, DARKGREEN);
+            DrawCircleV(irisRightPosition, 10, BLACK);
+            
+            DrawFPS(10, 10);
+            
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------   
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}