// DrawGlyph implements the GlyphDrawer interface.
func (CircleGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
var p vg.Path
p.Move(pt.X+sty.Radius, pt.Y)
p.Arc(pt.X, pt.Y, sty.Radius, 0, 2*math.Pi)
p.Close()
c.Fill(p)
}
// DrawGlyph implements the Glyph interface.
func (RingGlyph) DrawGlyph(c *Canvas, sty GlyphStyle, pt Point) {
c.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
var p vg.Path
p.Move(pt.X+sty.Radius, pt.Y)
p.Arc(pt.X, pt.Y, sty.Radius, 0, 2*math.Pi)
p.Close()
c.Stroke(p)
}
// Plot implements the Plot method of the plot.Plotter interface.
func (bs *Bubbles) Plot(c draw.Canvas, plt *plot.Plot) {
trX, trY := plt.Transforms(&c)
c.SetColor(bs.Color)
for _, d := range bs.XYZs {
x := trX(d.X)
y := trY(d.Y)
if !c.Contains(draw.Point{x, y}) {
continue
}
rad := bs.radius(d.Z)
// draw a circle centered at x, y
var p vg.Path
p.Move(x+rad, y)
p.Arc(x, y, rad, 0, 2*math.Pi)
p.Close()
c.Fill(p)
}
}