865b216ebe
Most of the examples already working! Only some of them still fail, mostly related to data arrays...
113 lines
No EOL
4.3 KiB
Lua
113 lines
No EOL
4.3 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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-- 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] = {}
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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 = BlendMode.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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break
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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 == BlendMode.ALPHA) then blending = BlendMode.ADDITIVE
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else blending = BlendMode.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//1, smoke.height*mouseTail[i].size//1),
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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 == BlendMode.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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