-- local img = assert(Image.load("/home/hkc/images/wallpapers/wallpaper.png"))
-- local font = assert(Font.load("/usr/share/fonts/TTF/TerminusTTF.ttf"))

function tick(t)
    --           Background
    Draw.clear(0xFF131300 | math.floor(128 + math.sin(t) * 127))

    --         Color ARGB,  x,  y
    Draw.pixel(0xFFFF0000,
      (math.sin(t) * 0.5 + 0.5) * 1920,
      (math.cos(t) * 0.5 + 0.5) * 1080)

    --        Color ARGB,  x1,  y1,  x2,  y2,  xn,  yn, ...
    Draw.poly(0xFF00FFFF, 100, 100, 200, 100, 300, 600) --> Rect
    --        Color ARGB, thickness,  x1,  y1,  x2,  y2,  xn,  yn, ...
    Draw.line(0xFFFF00FF,         8, 100, 100, 200, 100, 300, 600, 100, 100) --> { Vec2, ... }

    --        Color ARGB, thickness,   x,   y,   w,   h
    Draw.rect(0xFFFF000F,         4, 100, 700, 320, 240) --> Rect
    --             Color ARGB,   x,   y,   w,   h
    Draw.rect_fill(0xFF00FFFF, 100, 700, 320, 240) --> Rect

    --          Color ARGB, radius,   x,   y, start, end
    Draw.circle(0xFFFF0000,     40, 300, 300, t, t + math.pi / 2) --> Rect
    --        Color ARGB, outer, inner,  x,   y, start, end
    Draw.ring(0xFFFFFFFF,    30,    20, 300, 300, t, t + math.pi) --> Rect

    --[[
    --        font,            text, size,   x,   y, Color ARGB
    Draw.text(font, "Hello, world!",   32, 400, 400, 0xFFFF00FF) --> Rect

    --          image ptr  x, y, w, h, src_x, src_y, src_w, src_h
    Draw.image(       img, 0, 0) --> Rect
]]
end

function unload()
    Image.free(img)
    Font.free(font)
end