func redraw(g *gx.Graphics, pts []Point) {
g.Clear()
g.SetPenCol(gx.BLACK, 1.0)
g.SetPenWidth(4)
g.SetFillCol(gx.GREEN, 1.0)
polygons(g)
rainbow(g)
trace(g, pts)
}
func trace(g *gx.Graphics, pts []Point) {
var hd []Point
if len(pts) < 2 {
return
}
tail := pts
g.SetPenWidth(5)
g.SetPenCol(gx.BLACK, 1.0)
i := 0
for {
i++
hd, tail = head(tail)
if len(hd) == 0 {
continue
}
if i>last && len(hd)>Nsmooth {
hd = simplify(hd)
frozen := hd[:len(hd)-Nsmooth]
sm := hd[len(hd)-Nsmooth:]
sm = smooth(sm)
hd = append(frozen, sm...)
}
lpt := hd[0]
for i := 1; i < len(hd); i++ {
pt := hd[i]
g.Line(lpt.x, lpt.y, pt.x, pt.y)
lpt = pt
}
if len(tail) == 0 {
return
}
last = i
}
}
func polygons(g *gx.Graphics) {
for i := 6; i >= 3; i-- {
g.Polygon(100, 100, 100, i, 0)
}
}
func xbgopen(g *gx.Graphics) int {
return xbopen("g:"+g.Name(), "rw", g)
}