// Line draws a line between two points. It's 1 pixel thick.
func (w *Window) Line(v1, v2 *geom.Vec2, r, g, b byte) {
// Always draw from left to right (x1 <= x2)
if v1[0] > v2[0] {
v1, v2 = v2, v1
}
dx := v2[0] - v1[0]
dy := v2[1] - v1[1]
var steps int
if tmath.Absi(dx) > tmath.Absi(dy) {
steps = dx
} else {
steps = tmath.Absi(dy)
}
xinc := float64(dx) / float64(steps)
yinc := float64(dy) / float64(steps)
x := float64(v1[0])
y := float64(v1[1])
for s := 0; s <= steps; s++ {
w.Setxy(tmath.Round(x), tmath.Round(y), r, g, b)
x += xinc
y += yinc
}
}
// DrawLine draws a 1 pixel thick line between the (x1,y1) and (x2,y2) with the
// given color.
func (img *Image) DrawLine(x1, y1, x2, y2 int, c color.Color) {
r := img.Rgba
// Always draw from left to right (x1 <= x2)
if x1 > x2 {
x1, y1, x2, y2 = x2, y2, x1, y1
}
dx := x2 - x1
dy := y2 - y1
var steps int
if tmath.Absi(dx) > tmath.Absi(dy) {
steps = tmath.Absi(dx)
} else {
steps = tmath.Absi(dy)
}
xinc := float64(dx) / float64(steps)
yinc := float64(dy) / float64(steps)
x := float64(x1)
y := float64(y1)
for s := 0; s <= steps; s++ {
r.Set(tmath.Round(x), tmath.Round(y), c)
x += xinc
y += yinc
}
}