// 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)
}
func (point GrobPoint) Draw(vp Viewport) {
vp.Canvas.Push()
vp.Canvas.SetColor(point.color)
vp.Canvas.SetLineWidth(1)
x, y := vp.X(point.x), vp.Y(point.y)
s := vg.Points(point.size)
var p vg.Path
draw := vp.Canvas.Stroke
if point.shape >= SolidCirclePoint && point.shape <= SolidNablaPoint {
draw = vp.Canvas.Fill
}
switch point.shape {
case BlankPoint:
return
case DotPoint:
dpi := vp.Canvas.DPI()
p.Arc(x, y, vg.Inch/vg.Length(dpi), 0, 2*math.Pi)
p.Close()
vp.Canvas.Fill(p)
case CirclePoint, SolidCirclePoint:
p.Arc(x, y, vg.Points(point.size), 0, 2*math.Pi)
p.Close()
draw(p)
case SquarePoint, SolidSquarePoint:
p.Move(x-s, y-s)
p.Line(x+s, y-s)
p.Line(x+s, y+s)
p.Line(x-s, y+s)
p.Close()
draw(p)
case DiamondPoint, SolidDiamondPoint:
p.Move(x, y-s)
p.Line(x+s, y)
p.Line(x, y+s)
p.Line(x-s, y)
p.Close()
draw(p)
case DeltaPoint, SolidDeltaPoint:
ss := 0.57735 * s
p.Move(x, y+2*ss)
p.Line(x-s, y-ss)
p.Line(x+s, y-ss)
p.Close()
draw(p)
case NablaPoint, SolidNablaPoint:
ss := 0.57735 * s
p.Move(x, y-2*ss)
p.Line(x-s, y+ss)
p.Line(x+s, y+ss)
p.Close()
draw(p)
case CrossPoint:
ss := s / 1.3
p.Move(x-ss, y-ss)
p.Line(x+ss, y+ss)
p.Move(x-ss, y+ss)
p.Line(x+ss, y-ss)
draw(p)
case PlusPoint:
p.Move(x-s, y)
p.Line(x+s, y)
p.Move(x, y-s)
p.Line(x, y+s)
draw(p)
case StarPoint:
ss := s / 1.3
p.Move(x-ss, y-ss)
p.Line(x+ss, y+ss)
p.Move(x-ss, y+ss)
p.Line(x+ss, y-ss)
p.Move(x-s, y)
p.Line(x+s, y)
p.Move(x, y-s)
p.Line(x, y+s)
draw(p)
default:
println("Implement Draw for points " + point.shape.String())
}
vp.Canvas.Pop()
}
