122 lines
4.4 KiB
Lua
122 lines
4.4 KiB
Lua
-------------------------------------------------------------------------------------------
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--
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-- raylib example - particles trail blending
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--
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-- This example has been created using raylib 1.6 (www.raylib.com)
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-- raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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--
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-- Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
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--
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-------------------------------------------------------------------------------------------
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MAX_PARTICLES = 200
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-- Particle structure with basic data
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struct.Particle {
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position,
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color,
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alpha,
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size,
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rotation,
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active -- NOTE: Use it to activate/deactive particle
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}
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-- Initialization
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-------------------------------------------------------------------------------------------
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local screenWidth = 800
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local screenHeight = 450
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InitWindow(screenWidth, screenHeight, "raylib [textures] example - particles trail blending")
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-- Particles pool, reuse them!
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local mouseTail = {}
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-- Initialize particles
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for i = 1, MAX_PARTICLES do
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mouseTail[i].position = Vector2(0, 0)
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mouseTail[i].color = Color(GetRandomValue(0, 255), GetRandomValue(0, 255), GetRandomValue(0, 255), 255)
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mouseTail[i].alpha = 1.0
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mouseTail[i].size = GetRandomValue(1, 30)/20.0
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mouseTail[i].rotation = GetRandomValue(0, 360)
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mouseTail[i].active = false
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end
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local gravity = 3.0
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local smoke = LoadTexture("resources/smoke.png")
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local blending = BLEND.ALPHA
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SetTargetFPS(60)
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-------------------------------------------------------------------------------------------
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-- Main game loop
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while not WindowShouldClose() do -- Detect window close button or ESC key
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-- Update
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---------------------------------------------------------------------------------------
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-- Activate one particle every frame and Update active particles
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-- NOTE: Particles initial position should be mouse position when activated
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-- NOTE: Particles fall down with gravity and rotation... and disappear after 2 seconds (alpha = 0)
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-- NOTE: When a particle disappears, active = false and it can be reused.
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for i = 1, MAX_PARTICLES do
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if (not mouseTail[i].active) then
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mouseTail[i].active = true
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mouseTail[i].alpha = 1.0
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mouseTail[i].position = GetMousePosition()
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i = MAX_PARTICLES
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end
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end
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for i = 1, MAX_PARTICLES do
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if (mouseTail[i].active) then
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mouseTail[i].position.y = mouseTail[i].position.y + gravity
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mouseTail[i].alpha = mouseTail[i].alpha - 0.01
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if (mouseTail[i].alpha <= 0.0) then mouseTail[i].active = false end
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mouseTail[i].rotation = mouseTail[i].rotation + 5.0
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end
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end
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if (IsKeyPressed(KEY.SPACE)) then
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if (blending == BLEND.ALPHA) then blending = BLEND_ADDITIVE
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else blending = BLEND.ALPHA end
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end
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---------------------------------------------------------------------------------------
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-- Draw
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---------------------------------------------------------------------------------------
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BeginDrawing()
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ClearBackground(DARKGRAY)
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BeginBlendMode(blending)
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-- Draw active particles
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for i = 1, MAX_PARTICLES do
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if (mouseTail[i].active) then
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DrawTexturePro(smoke, Rectangle(0, 0, smoke.width, smoke.height),
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Rectangle(mouseTail[i].position.x, mouseTail[i].position.y,
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smoke.width*mouseTail[i].size, smoke.height*mouseTail[i].size),
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Vector2(smoke.width*mouseTail[i].size/2, smoke.height*mouseTail[i].size/2),
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mouseTail[i].rotation, Fade(mouseTail[i].color, mouseTail[i].alpha)) end
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end
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EndBlendMode()
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DrawText("PRESS SPACE to CHANGE BLENDING MODE", 180, 20, 20, BLACK)
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if (blending == BLEND_ALPHA) then DrawText("ALPHA BLENDING", 290, screenHeight - 40, 20, BLACK)
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else DrawText("ADDITIVE BLENDING", 280, screenHeight - 40, 20, RAYWHITE) end
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EndDrawing()
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---------------------------------------------------------------------------------------
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end
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-- De-Initialization
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-------------------------------------------------------------------------------------------
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UnloadTexture(smoke)
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CloseWindow() -- Close window and OpenGL context
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------------------------------------------------------------------------------------------- |