mirror of
https://github.com/Rezmason/matrix.git
synced 2026-04-14 12:29:30 -07:00
98 lines
2.8 KiB
Lua
98 lines
2.8 KiB
Lua
local gfx <const> = playdate.graphics
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local screenWidth <const> = playdate.display.getWidth()
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local screenHeight <const> = playdate.display.getHeight()
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local glyphWidth <const> = 20
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local numColumns <const> = math.floor(screenWidth / glyphWidth)
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local numRows <const> = math.floor(screenHeight / glyphWidth)
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local numCells <const> = numColumns * numRows
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local numGlyphs <const> = 133
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local numFades <const> = 15
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local blackImage = gfx.image.new(glyphWidth, glyphWidth, gfx.kColorBlack)
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local glyphTable = gfx.imagetable.new('images/matrix')
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local ditherType = gfx.image.kDitherTypeAtkinson
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local glyphs = {}
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for i = 1, numGlyphs do
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glyphs[i] = {}
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local glyph = glyphTable[i]
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for j = 1, numFades do
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glyphs[i][j] = glyph:blendWithImage(blackImage, 1 - j / numFades, ditherType)
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end
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end
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local minSpeed <const> = 0.15
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local maxSpeed <const> = 1
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local time = 0
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local speed = maxSpeed
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local sqrt2 <const> = math.sqrt(2)
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local sqrt5 <const> = math.sqrt(5)
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function wobble(x)
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return x + 0.3 * math.sin(sqrt2 * x) + 0.2 * math.sin(sqrt5 * x)
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end
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local cells = {}
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for x = 1, numColumns do
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local columnTimeOffset = math.random() * 1000
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local columnSpeedOffset = math.random() * 0.5 + 0.5
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for y = 1, numRows do
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local cell = {}
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cell.x = x
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cell.y = y
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cell.glyphCycle = math.random()
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cell.columnTimeOffset = columnTimeOffset
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cell.columnSpeedOffset = columnSpeedOffset
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cell.glyphIndex = math.floor(math.random() * numGlyphs) + 1
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cell.fadeIndex = -1
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cells[#cells + 1] = cell
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end
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end
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playdate.display.setRefreshRate(0)
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playdate.resetElapsedTime()
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function playdate.update()
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local delta
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if playdate.isCrankDocked() then
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speed = math.min(maxSpeed, speed + 0.07)
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delta = playdate.getElapsedTime() * speed
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else
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speed = math.max(minSpeed, speed - 0.07)
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delta = playdate.getElapsedTime() * speed + playdate.getCrankChange() * 2 / 360 -- TODO: tune
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end
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playdate.resetElapsedTime()
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time += delta
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for i = 1, numCells do
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local mustDraw = false
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local cell = cells[i]
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local cellTime = cell.y * -0.03 + cell.columnTimeOffset + time * cell.columnSpeedOffset
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local brightness = math.log((1 - wobble(cellTime) % 1) * 1.25) * 6
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local fadeIndex = math.max(1, math.min(numFades, math.floor(numFades * (1 - brightness))))
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if cell.fadeIndex ~= fadeIndex then
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cell.fadeIndex = fadeIndex
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mustDraw = true
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end
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cell.glyphCycle = cell.glyphCycle + delta * 2
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if cell.glyphCycle > 1 then
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cell.glyphCycle = cell.glyphCycle % 1
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local glyphIndex = (cell.glyphIndex + math.random(20)) % numGlyphs + 1
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if cell.glyphIndex ~= glyphIndex then
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cell.glyphIndex = glyphIndex
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if fadeIndex < numFades then
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mustDraw = true
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end
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end
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end
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if mustDraw then
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glyphs[cell.glyphIndex][cell.fadeIndex]:draw((cell.x - 1) * glyphWidth, (cell.y - 1) * glyphWidth)
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end
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end
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end
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