// DrawGlyph implements the GlyphDrawer interface.
func (c CircleGlyph) DrawGlyph(da *DrawArea, 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()
da.Fill(p)
}
func (pt *Dots) Plot(da plot.DrawArea, plt *plot.Plot) {
trX, trY := plt.Transforms(&da)
da.SetColor(pt.Color)
for i := range pt.Y {
// Transform the data x, y coordinate of this bubble
// to the corresponding drawing coordinate.
x := trX(pt.X[i])
y := trY(pt.Y[i])
// Get the radius of this bubble. The radius
// is specified in drawing units (i.e., its size
// is given as the final size at which it will
// be drawn) so it does not need to be transformed.
rad := vg.Length(2)
// Fill a circle centered at x,y on the draw area.
var p vg.Path
p.Move(x+rad, y)
p.Arc(x, y, rad, 0, 2*math.Pi)
p.Close()
da.Fill(p)
}
}
// DrawGlyph implements the Glyph interface.
func (RingGlyph) DrawGlyph(da *DrawArea, sty GlyphStyle, pt Point) {
da.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()
da.Stroke(p)
}
// DrawGlyph implements the Glyph interface.
func (PyramidGlyph) DrawGlyph(da *DrawArea, sty GlyphStyle, pt Point) {
r := sty.Radius + (sty.Radius-sty.Radius*sinπover6)/2
var p vg.Path
p.Move(pt.X, pt.Y+r)
p.Line(pt.X-r*cosπover6, pt.Y-r*sinπover6)
p.Line(pt.X+r*cosπover6, pt.Y-r*sinπover6)
p.Close()
da.Fill(p)
}
func pathRectangle(top vg.Length, right vg.Length, bottom vg.Length, left vg.Length) vg.Path {
p := vg.Path{}
p.Move(left, top)
p.Line(right, top)
p.Line(right, bottom)
p.Line(left, bottom)
p.Close()
return p
}
// DrawGlyph implements the Glyph interface.
func (TriangleGlyph) DrawGlyph(da *DrawArea, sty GlyphStyle, pt Point) {
da.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
r := sty.Radius + (sty.Radius-sty.Radius*sinπover6)/2
var p vg.Path
p.Move(pt.X, pt.Y+r)
p.Line(pt.X-r*cosπover6, pt.Y-r*sinπover6)
p.Line(pt.X+r*cosπover6, pt.Y-r*sinπover6)
p.Close()
da.Stroke(p)
}
// DrawGlyph implements the Glyph interface.
func (BoxGlyph) DrawGlyph(da *DrawArea, sty GlyphStyle, pt Point) {
x := (sty.Radius-sty.Radius*cosπover4)/2 + sty.Radius*cosπover4
var p vg.Path
p.Move(pt.X-x, pt.Y-x)
p.Line(pt.X+x, pt.Y-x)
p.Line(pt.X+x, pt.Y+x)
p.Line(pt.X-x, pt.Y+x)
p.Close()
da.Fill(p)
}
// DrawGlyph implements the Glyph interface.
func (SquareGlyph) DrawGlyph(da *DrawArea, sty GlyphStyle, pt Point) {
da.SetLineStyle(LineStyle{Color: sty.Color, Width: vg.Points(0.5)})
x := (sty.Radius-sty.Radius*cosπover4)/2 + sty.Radius*cosπover4
var p vg.Path
p.Move(pt.X-x, pt.Y-x)
p.Line(pt.X+x, pt.Y-x)
p.Line(pt.X+x, pt.Y+x)
p.Line(pt.X-x, pt.Y+x)
p.Close()
da.Stroke(p)
}
// FillPolygon fills a polygon with the given color.
func (da *DrawArea) FillPolygon(clr color.Color, pts []Point) {
if len(pts) == 0 {
return
}
da.SetColor(clr)
var p vg.Path
p.Move(pts[0].X, pts[0].Y)
for _, pt := range pts[1:] {
p.Line(pt.X, pt.Y)
}
p.Close()
da.Fill(p)
}
// Plot implements the Plot method of the plot.Plotter interface.
func (bs *Bubbles) Plot(da plot.DrawArea, plt *plot.Plot) {
trX, trY := plt.Transforms(&da)
da.SetColor(bs.Color)
for _, d := range bs.XYZs {
x := trX(d.X)
y := trY(d.Y)
if !da.Contains(plot.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()
da.Fill(p)
}
}
// DrawFonts draws some text in all of the various
// fonts along with a box to make sure that their
// sizes are computed correctly.
func DrawFonts(c vg.Canvas) {
y := vg.Points(0)
var fonts []string
for fname := range vg.FontMap {
fonts = append(fonts, fname)
}
sort.Strings(fonts)
for _, fname := range fonts {
font, err := vg.MakeFont(fname, 20)
if err != nil {
panic(err)
}
w := font.Width(fname + "Xqg")
h := font.Extents().Ascent
c.FillString(font, 0, y-font.Extents().Descent, fname+"Xqg")
fmt.Println(fname)
var path vg.Path
path.Move(0, y+h)
path.Line(w, y+h)
path.Line(w, y)
path.Line(0, y)
path.Close()
c.Stroke(path)
path = vg.Path{}
c.SetColor(color.RGBA{B: 255, A: 255})
c.SetLineDash([]vg.Length{vg.Points(5), vg.Points(3)}, 0)
path.Move(0, y-font.Extents().Descent)
path.Line(w, y-font.Extents().Descent)
c.Stroke(path)
c.SetColor(color.Black)
c.SetLineDash([]vg.Length{}, 0)
y += h
}
}
// Plot draws the Line, implementing the plot.Plotter
// interface.
func (pts *Line) Plot(da plot.DrawArea, plt *plot.Plot) {
trX, trY := plt.Transforms(&da)
ps := make([]plot.Point, len(pts.XYs))
for i, p := range pts.XYs {
ps[i].X = trX(p.X)
ps[i].Y = trY(p.Y)
}
if pts.ShadeColor != nil && len(ps) > 0 {
da.SetColor(*pts.ShadeColor)
minY := trY(plt.Y.Min)
var pa vg.Path
pa.Move(ps[0].X, minY)
for i := range pts.XYs {
pa.Line(ps[i].X, ps[i].Y)
}
pa.Line(ps[len(pts.XYs)-1].X, minY)
pa.Close()
da.Fill(pa)
}
da.StrokeLines(pts.LineStyle, da.ClipLinesXY(ps)...)
}
