mirror of https://github.com/mgba-emu/mgba.git
35 lines
1.1 KiB
Lua
35 lines
1.1 KiB
Lua
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local state = {}
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state.wheel = image.load(script.dir .. "/wheel.png")
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state.overlay = canvas:newLayer(state.wheel.width, state.wheel.height)
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state.painter = image.newPainter(state.overlay.image)
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state.phase = 0
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state.speed = 0.01
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state.painter:setFill(true)
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state.painter:setStrokeWidth(0)
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function state.update()
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local r = math.fmod(state.phase * 3, math.pi * 2)
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local g = math.fmod(state.phase * 5, math.pi * 2)
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local b = math.fmod(state.phase * 7, math.pi * 2)
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local color = 0xFF000000
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color = color | math.floor((math.sin(r) + 1) * 127.5) << 16
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color = color | math.floor((math.sin(g) + 1) * 127.5) << 8
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color = color | math.floor((math.sin(b) + 1) * 127.5)
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-- Clear image
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state.painter:setBlend(false)
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state.painter:setFillColor(0)
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state.painter:drawRectangle(0, 0, state.wheel.width, state.wheel.height)
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-- Draw mask
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state.painter:setBlend(true)
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state.painter:setFillColor(color | 0xFF000000)
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state.painter:drawMask(state.wheel, 0, 0)
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state.overlay:update()
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state.phase = math.fmod(state.phase + state.speed, math.pi * 2 * 3 * 5 * 7)
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end
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callbacks:add("frame", state.update)
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