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Add easings example

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flashback-fx 2019-05-24 19:10:14 +00:00
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commit b7d4856745
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examples/core/easings_example.c Normal file
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/*******************************************************************************************
*
* raylib [easings] example
*
* 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 Juan Miguel López
*
********************************************************************************************/
#include <raylib.h>
#include "easings.h"
// Application constants
#define SCR_WIDTH 800
#define SCR_HEIGHT 450
#define BALL_RADIUS 16.0f
#define BALL_COLOR MAROON
#define PAD 80.0f
#define START_X (0.0f + (BALL_RADIUS) + (PAD))
#define END_X ((SCR_WIDTH) - ((BALL_RADIUS) + (PAD)))
#define START_Y (0.0f + (BALL_RADIUS) + (PAD))
#define END_Y ((SCR_HEIGHT) - ((BALL_RADIUS) + (PAD)))
#define T_ADVANCE 1.0f
#define D_DFT 300.0f
#define TARGET_FPS 60
#define BG_COLOR RAYWHITE
#define TEXT_COLOR LIGHTGRAY
#define FONT_SIZE 20
#define D_STEP 20.0f
#define D_STEP_FINE 2.0f
#define D_MIN 1.0f
#define D_MAX 10000.0f
// Application control keys
#define KEY_NEXT_EASE_X KEY_RIGHT
#define KEY_PREV_EASE_X KEY_LEFT
#define KEY_NEXT_EASE_Y KEY_DOWN
#define KEY_PREV_EASE_Y KEY_UP
#define KEY_INCR_D_STEP KEY_W
#define KEY_DECR_D_STEP KEY_Q
#define KEY_INCR_D_FINE KEY_S
#define KEY_DECR_D_FINE KEY_A
#define KEY_PLAY_PAUSE KEY_ENTER
#define KEY_RESTART KEY_SPACE
#define KEY_TOGGLE_UNBOUNDED_T KEY_T
// Easing types
enum EasingTypes {
EASE_LINEAR_NONE,
EASE_LINEAR_IN,
EASE_LINEAR_OUT,
EASE_LINEAR_IN_OUT,
EASE_SINE_IN,
EASE_SINE_OUT,
EASE_SINE_IN_OUT,
EASE_CIRC_IN,
EASE_CIRC_OUT,
EASE_CIRC_IN_OUT,
EASE_CUBIC_IN,
EASE_CUBIC_OUT,
EASE_CUBIC_IN_OUT,
EASE_QUAD_IN,
EASE_QUAD_OUT,
EASE_QUAD_IN_OUT,
EASE_EXPO_IN,
EASE_EXPO_OUT,
EASE_EXPO_IN_OUT,
EASE_BACK_IN,
EASE_BACK_OUT,
EASE_BACK_IN_OUT,
EASE_BOUNCE_OUT,
EASE_BOUNCE_IN,
EASE_BOUNCE_IN_OUT,
EASE_ELASTIC_IN,
EASE_ELASTIC_OUT,
EASE_ELASTIC_IN_OUT,
NUM_EASING_TYPES,
EASING_NONE = NUM_EASING_TYPES
};
static float NoEase(float t, float b, float c, float d); // NoEase function declaration, function used when "no easing" is selected for any axis
// Easing functions reference data
static const struct {
const char *name;
float (*func)(float, float, float, float);
} Easings[] = {
[EASE_LINEAR_NONE] = {
.name = "EaseLinearNone",
.func = EaseLinearNone,
},
[EASE_LINEAR_IN] = {
.name = "EaseLinearIn",
.func = EaseLinearIn,
},
[EASE_LINEAR_OUT] = {
.name = "EaseLinearOut",
.func = EaseLinearOut,
},
[EASE_LINEAR_IN_OUT] = {
.name = "EaseLinearInOut",
.func = EaseLinearInOut,
},
[EASE_SINE_IN] = {
.name = "EaseSineIn",
.func = EaseSineIn,
},
[EASE_SINE_OUT] = {
.name = "EaseSineOut",
.func = EaseSineOut,
},
[EASE_SINE_IN_OUT] = {
.name = "EaseSineInOut",
.func = EaseSineInOut,
},
[EASE_CIRC_IN] = {
.name = "EaseCircIn",
.func = EaseCircIn,
},
[EASE_CIRC_OUT] = {
.name = "EaseCircOut",
.func = EaseCircOut,
},
[EASE_CIRC_IN_OUT] = {
.name = "EaseCircInOut",
.func = EaseCircInOut,
},
[EASE_CUBIC_IN] = {
.name = "EaseCubicIn",
.func = EaseCubicIn,
},
[EASE_CUBIC_OUT] = {
.name = "EaseCubicOut",
.func = EaseCubicOut,
},
[EASE_CUBIC_IN_OUT] = {
.name = "EaseCubicInOut",
.func = EaseCubicInOut,
},
[EASE_QUAD_IN] = {
.name = "EaseQuadIn",
.func = EaseQuadIn,
},
[EASE_QUAD_OUT] = {
.name = "EaseQuadOut",
.func = EaseQuadOut,
},
[EASE_QUAD_IN_OUT] = {
.name = "EaseQuadInOut",
.func = EaseQuadInOut,
},
[EASE_EXPO_IN] = {
.name = "EaseExpoIn",
.func = EaseExpoIn,
},
[EASE_EXPO_OUT] = {
.name = "EaseExpoOut",
.func = EaseExpoOut,
},
[EASE_EXPO_IN_OUT] = {
.name = "EaseExpoInOut",
.func = EaseExpoInOut,
},
[EASE_BACK_IN] = {
.name = "EaseBackIn",
.func = EaseBackIn,
},
[EASE_BACK_OUT] = {
.name = "EaseBackOut",
.func = EaseBackOut,
},
[EASE_BACK_IN_OUT] = {
.name = "EaseBackInOut",
.func = EaseBackInOut,
},
[EASE_BOUNCE_OUT] = {
.name = "EaseBounceOut",
.func = EaseBounceOut,
},
[EASE_BOUNCE_IN] = {
.name = "EaseBounceIn",
.func = EaseBounceIn,
},
[EASE_BOUNCE_IN_OUT] = {
.name = "EaseBounceInOut",
.func = EaseBounceInOut,
},
[EASE_ELASTIC_IN] = {
.name = "EaseElasticIn",
.func = EaseElasticIn,
},
[EASE_ELASTIC_OUT] = {
.name = "EaseElasticOut",
.func = EaseElasticOut,
},
[EASE_ELASTIC_IN_OUT] = {
.name = "EaseElasticInOut",
.func = EaseElasticInOut,
},
[EASING_NONE] = {
.name = "None",
.func = NoEase,
},
};
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
Vector2 ballPos = { .x = START_X, .y = START_Y };
float t = 0.0f; // Current time (in any unit measure, but same unit as duration)
float d = D_DFT; // Total time it should take to complete (duration)
bool paused = true;
bool boundedT = true; // If true, t will stop when d >= td, otherwise t will keep adding td to its value every loop
enum EasingTypes easingX = EASING_NONE; // Easing selected for x axis
enum EasingTypes easingY = EASING_NONE; // Easing selected for y axis
InitWindow(SCR_WIDTH, SCR_HEIGHT, "raylib [easings] example");
SetTargetFPS(TARGET_FPS);
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
if (IsKeyPressed(KEY_TOGGLE_UNBOUNDED_T))
boundedT = 1 - boundedT;
// Choose easing for the X axis
if (IsKeyPressed(KEY_NEXT_EASE_X))
{
++easingX;
if (easingX > EASING_NONE)
easingX = 0;
}
else if (IsKeyPressed(KEY_PREV_EASE_X))
{
if (easingX == 0)
easingX = EASING_NONE;
else
--easingX;
}
// Choose easing for the Y axis
if (IsKeyPressed(KEY_NEXT_EASE_Y))
{
++easingY;
if (easingY > EASING_NONE)
easingY = 0;
}
else if (IsKeyPressed(KEY_PREV_EASE_Y))
{
if (easingY == 0)
easingY = EASING_NONE;
else
--easingY;
}
// Change d (duration) value
if (IsKeyPressed(KEY_INCR_D_STEP) && d < D_MAX - D_STEP)
d += D_STEP;
else if (IsKeyPressed(KEY_DECR_D_STEP) && d > D_MIN + D_STEP)
d -= D_STEP;
if (IsKeyDown(KEY_INCR_D_FINE) && d < D_MAX - D_STEP_FINE)
d += D_STEP_FINE;
else if (IsKeyDown(KEY_DECR_D_FINE) && d > D_MIN + D_STEP_FINE)
d -= D_STEP_FINE;
// Play, pause and restart controls
if (IsKeyPressed(KEY_RESTART) ||
IsKeyPressed(KEY_NEXT_EASE_X) || IsKeyPressed(KEY_PREV_EASE_X) ||
IsKeyPressed(KEY_NEXT_EASE_Y) || IsKeyPressed(KEY_PREV_EASE_Y) ||
IsKeyPressed(KEY_INCR_D_STEP) || IsKeyPressed(KEY_DECR_D_STEP) ||
IsKeyPressed(KEY_TOGGLE_UNBOUNDED_T) ||
IsKeyDown(KEY_INCR_D_FINE) || IsKeyDown(KEY_DECR_D_FINE) ||
(IsKeyPressed(KEY_PLAY_PAUSE) && boundedT == true && t >= d))
{
t = 0.0f;
ballPos.x = START_X;
ballPos.y = START_Y;
paused = true;
}
if (IsKeyPressed(KEY_PLAY_PAUSE))
paused = 1 - paused;
// Movement computation
if ((paused == false) &&
((boundedT == true && t < d) || boundedT == false))
{
ballPos.x = Easings[easingX].func(t, START_X, END_X - START_X, d);
ballPos.y = Easings[easingY].func(t, START_Y, END_Y - START_Y, d);
t += T_ADVANCE;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(BG_COLOR);
// Draw information text
int line = 0;
DrawText(TextFormat("Easing x: %s", Easings[easingX].name), 0, FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
DrawText(TextFormat("Easing y: %s", Easings[easingY].name), 0, FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
DrawText(TextFormat("t (%c) = %.2f d = %.2f", (boundedT == true)? 'b' : 'u', t, d),
0, FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
// Draw instructions text
line = 1;
DrawText("Use ENTER to play or pause movement, use SPACE to restart", 0, SCR_HEIGHT - FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
DrawText("Use D and W or A and S keys to change duration", 0, SCR_HEIGHT - FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
DrawText("Use LEFT or RIGHT keys to choose easing for the x axis", 0, SCR_HEIGHT - FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
DrawText("Use UP or DOWN keys to choose easing for the y axis", 0, SCR_HEIGHT - FONT_SIZE * (line++), FONT_SIZE, TEXT_COLOR);
// Draw ball
DrawCircleV(ballPos, BALL_RADIUS, BALL_COLOR);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow();
//--------------------------------------------------------------------------------------
return 0;
}
// NoEase function, used when "no easing" is selected for any axis. It just ignores all parameters besides b.
static float NoEase(float t, float b, float c, float d)
{
float burn = t + b + c + d; // Hack to avoid compiler warning (about unused variables)
d += burn;
return b;
}