166 lines
2.9 KiB
Lua
166 lines
2.9 KiB
Lua
function lerp(x0, x1, t)
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return x0*(1-t) + x1*t
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end
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function blendExp(x0, x1, t)
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return x0^(1-t)*x1^t
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end
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local sw = 640
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local sh = 480
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local font
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local fs = 12
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local coordsA = {}
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local coordsB = {}
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local coordsAL = {}
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local coordsBL = {}
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local input = {
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[0]=0.9013,
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[60]=1.3685,
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[120]=1.1046,
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[180]=1.1633,
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[240]=0.7332,
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[300]=0.8603,
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[360]=0.9013,
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}
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local xPrecision = 60/20
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local win = {
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T = 1.5,
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B = -0.5,
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L = 0,
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R = 360,
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stepX = 30,
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stepY = 0.25,
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}
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win.scaleX = 1/(win.L - win.R)
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win.scaleY = 1/(win.T - win.B)
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function screenX(x)
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return sw*(win.L-x)*win.scaleX
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end
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function screenY(y)
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return sh*(win.T-y)*win.scaleY
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end
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function addPoint(coords, x, y)
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coords[#coords+1] = screenX(x)
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coords[#coords+1] = screenY(y)
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end
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function index(t, x)
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if type(x) ~= type(0) then
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return nil
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end
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local x0
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local x1
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for tx, ty in pairs(t) do
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-- we can't guarantee the order the key/values come in
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if tx ~= "interpolator" then
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-- x0 = largest tx that doesn't go over x
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if tx <= x and (x0 == nil or tx > x0) then
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x0 = tx
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end
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-- x1 = smallest tx that doesn't go under x
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if tx > x and (x1 == nil or tx < x1) then
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x1 = tx
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end
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end
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end
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x1 = x1 or x0
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local y0 = rawget(t, x0)
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local y1 = rawget(t, x1)
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local f = rawget(t, "interpolator")
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local y = f(y0, y1, (x - x0)/(x1 - x0))
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return y
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end
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function love.load()
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if not love.graphics.setMode(sw, sh) then
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error("couldn't setMode ("..sw.." by "..sh..")")
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end
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love.graphics.setCaption("hey it's a graph")
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--font = love.graphics.newFont("DejaVuSansMono.ttf", fs)
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--love.graphics.setFont(font)
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setmetatable(input, {__index = index})
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input.interpolator = lerp
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for x=win.L, win.R, xPrecision do
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local y = input[x]
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addPoint(coordsA, x, y)
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addPoint(coordsAL, x, math.log(y))
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end
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input.interpolator = blendExp
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for x=win.L, win.R, xPrecision do
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local y = input[x]
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addPoint(coordsB, x, y)
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addPoint(coordsBL, x, math.log(y))
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end
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end
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function love.keypressed(key)
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if key == "escape" then
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love.event.push("quit")
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end
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end
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local drawCoords = love.graphics.line
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local drawText = love.graphics.print
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function color(hex)
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local r = tonumber(string.sub(hex, 1,2), 16)
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local g = tonumber(string.sub(hex, 3,4), 16)
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local b = tonumber(string.sub(hex, 5,6), 16)
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love.graphics.setColor(r,g,b)
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end
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function drawVert(x)
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drawCoords(x, 0, x, sh)
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end
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function drawHoriz(y)
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drawCoords(0, y, sw, y)
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end
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function love.draw()
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love.graphics.setBackgroundColor(255,255,255)
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love.graphics.clear()
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for x=win.L, win.R, win.stepX do
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color("d3e2e7")
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local rx = screenX(x)
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drawVert(rx)
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color("808080")
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drawText(tostring(x), rx, sh - fs)
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end
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for y=win.B, win.T, win.stepY do
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color("c6cce3")
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local ry = screenY(y)
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drawHoriz(ry)
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color("808080")
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drawText(tostring(y), 0, ry)
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end
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color("404040")
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drawVert(screenX(0))
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drawHoriz(screenY(0))
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color("57C1BB")
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drawCoords(coordsA)
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drawCoords(coordsAL)
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color("9F65C5")
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drawCoords(coordsB)
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drawCoords(coordsBL)
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end
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