90 lines
2.2 KiB
Lua
90 lines
2.2 KiB
Lua
--Character controller. Renders point particle.
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local love = love
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local oldBuffer = love.graphics.newCanvas()
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local newBuffer = love.graphics.newCanvas()
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local step = assert( step )
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local state
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local FRICTION = 0.008
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local MAXSPEED = 1.0
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local t, x, y, dx, dy, ddx, ddy
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local function Update()
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t = love.timer.getTime()
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dx = (1.0 - FRICTION) * dx + FRICTION * ddx
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dy = (1.0 - FRICTION) * dy + FRICTION * ddy
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local xf = x + dx * step * MAXSPEED
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local yf = y + dy * step * MAXSPEED
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end
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local function OnKey()
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ddx = (love.keyboard.isScancodeDown( "d" ) and 1.0 or 0.0) - (love.keyboard.isScancodeDown( "a" ) and 1.0 or 0.0)
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ddy = (love.keyboard.isScancodeDown( "s" ) and 1.0 or 0.0) - (love.keyboard.isScancodeDown( "w" ) and 1.0 or 0.0)
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local n = math.sqrt( ddx * ddx + ddy * ddy )
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if n < 0.001 then return end
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ddx, ddy = ddx / n, ddy / n
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end
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local function Draw()
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local dt = love.timer.getTime() - t
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local xf, yf = x + dt * dx, y + dt * dy
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local w, h = love.graphics.getDimensions()
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local xi, yi = 1000.0 * x + 0.5 * w, 1000.0 * y + 0.5 * h
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xf, yf = 1000.0 * xf + 0.5 * w, 1000.0 * yf + 0.5 * h
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love.graphics.setCanvas( newBuffer )
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love.graphics.setColor( 1.0, 1.0, 1.0 , 0.9 ) --Trans blue.
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love.graphics.draw( oldBuffer ) --Time-dependent fade: overlay canvas over itself.
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--Render latest segment in trail.
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love.graphics.setColor( 1.0, 1.0, 1.0, 1.0 ) --White?
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love.graphics.circle( "fill", xf, yf, 4.0 ) --TODO: replace with segments.
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love.graphics.line( xi, yi, xf, yf )
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love.graphics.setCanvas( oldBuffer )
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love.graphics.clear( 1.0, 1.0, 1.0, 0.0 )
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--Render circle directly to screen.
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love.graphics.setCanvas()
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love.graphics.draw( newBuffer )
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love.graphics.setColor( 245 / 255, 169 / 255, 184 / 255 ) --Trans pink.
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love.graphics.circle( "fill", xf, yf, 5.0 )
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oldBuffer, newBuffer = newBuffer, oldBuffer
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end
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local function Impact( impact )
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end
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--Window resize.
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local function Resize()
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end
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local function Reset()
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t = love.timer.getTime()
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x = 0
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y = 0
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dx = 0
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dy = 0
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ddx = 0
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ddy = 0
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end
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Reset()
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return {
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Update = Update,
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OnKey = OnKey,
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Draw = Draw,
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Impact = Impact,
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Reset = Reset,
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} |