func (self *LineChart) drawSeries(x, y, w, h float64, ctx vg.Context) {
// Boundries
baseline := y + h
_, max, count := self.Model.Limits()
horIncr := w / (count - 1)
vratio := (h - 1) / max
for _, s := range self.Model.Series() {
c1 := CloneColor(s.Color)
c1.A = 150
ctx.StrokeColor(c1)
ctx.StrokeWidth(s.StrokeWidth)
ctx.BeginPath()
for i, f := range s.Data {
if i == 0 {
ctx.MoveTo(x+float64(i)*horIncr, baseline-(f*vratio))
} else {
ctx.LineTo(x+float64(i)*horIncr, baseline-(f*vratio))
}
}
ctx.Stroke()
if self.Fill {
ctx.BeginPath()
// ctx.MoveTo(x, baseline)
c2 := CloneColor(s.Color)
c2.A = 200
ctx.FillColor(c2)
for i, f := range s.Data {
if i == 0 {
ctx.MoveTo(x+float64(i)*horIncr, baseline-(f*vratio))
}
ctx.LineTo(x+float64(i)*horIncr, baseline-(f*vratio))
if i == len(s.Data)-1 {
ctx.LineTo(x+float64(i)*horIncr, baseline)
ctx.LineTo(x, baseline)
ctx.MoveTo(x, baseline-(s.Data[0]*vratio))
break
}
}
ctx.Fill()
}
}
}
func (self *Text) Draw(ctx vg.Context) {
x, y, w, h := self.Bounds()
self.lastContext = &ctx
ctx.Scissor(x, y, w, h)
ctx.BeginPath()
ctx.RoundedRect(x, y, w, h, self.CornerRadius)
ctx.FillColor(self.Background)
ctx.Fill()
ctx.FillColor(self.Foreground)
self.forEachDrawnToken(x, y, w, h,
func(i int, x, y, lineHeight float64, bounds *ui.Rectangle, ctx *vg.Context) {
ctx.Text(x, y, self.tokens[i])
},
)
// for i := 0; i < len(self.selections); i++ {
// s := self.selections[i]
// }
ctx.ResetScissor()
}
// draw draws the title and returns the height.
func (self *Title) draw(x, y, w, h float64, ctx vg.Context) float64 {
th := 0.0
name := self.Model.Title()
if len(name) > 0 {
th = self.FontSize + 16
// ctx.BeginPath()
// ctx.StrokeColor(color.RGBA{0, 50, 100, 25})
// ctx.StrokeWidth(1)
// ctx.LineCap(vg.ROUND)
// ctx.LineJoin(vg.ROUND)
// ctx.MoveTo(x, y+th)
// ctx.LineTo(x+1.5, y+th)
// ctx.LineTo(x+w+1.5, y+th)
// ctx.Stroke()
ctx.FillColor(color.RGBA{255, 251, 251, 255})
ctx.TextAlign(vg.ALIGN_LEFT | vg.ALIGN_MIDDLE)
ctx.SetFontSize(self.FontSize + 3)
ctx.FindFont(vg.FONT_DEFAULT)
ctx.WrappedText(x+10, y+self.FontSize, w, name)
}
return th
}