func NewText(text string, font *ui.Font) *Text {
t := new(Text)
t.Wrap = true
t.Text = text
t.Font = font
t.layout = ui.NewTextLayout(text, font, 0)
t.lText = text
t.lFont = font
return t
}
func (a HistogramAreaHandler) Draw(area *ui.Area, dp *ui.AreaDrawParams) {
fntNum := ui.LoadClosestFont(&ui.FontDescriptor{Family: "Droid Sans", Size: 10, Weight: ui.TextWeightBold})
fntVolume := ui.LoadClosestFont(&ui.FontDescriptor{Family: "Droid Sans", Size: 12, Italic: ui.TextItalicItalic})
brush := &ui.Brush{Type: ui.Solid, R: 0.1, G: 0.5, B: 0.7, A: 1}
columnWidth := dp.AreaWidth / float64(len(a.Data))
barWidth := columnWidth * 0.8
for i, volume := range a.Data {
x1 := (float64(i) + 0.1) * columnWidth
x2 := x1 + barWidth
y1 := dp.AreaHeight - 16
y2 := y1 - (dp.AreaHeight-32.0)*float64(volume)/100.0
layoutNum := ui.NewTextLayout(strconv.Itoa(i), fntNum, columnWidth)
w1, _ := layoutNum.Extents()
dp.Context.Text(x1+(barWidth-w1)/2, y1, layoutNum)
layoutVolume := ui.NewTextLayout(strconv.Itoa(volume), fntVolume, columnWidth)
w2, h2 := layoutVolume.Extents()
dp.Context.Text(x1+(barWidth-w2)/2, y2-h2, layoutVolume)
dp.Context.Save()
p := ui.NewPath(ui.Winding)
p.NewFigure(x1, y1)
p.LineTo(x2, y1)
p.LineTo(x2, y2)
p.LineTo(x1, y2)
p.CloseFigure()
p.End()
dp.Context.Fill(p, brush)
dp.Context.Restore()
}
}
func (e *Text) Layout(width float64) (w float64, h float64) {
if !e.Wrap {
width = math.MaxFloat64
}
if e.Text != e.lText || e.Font != e.lFont {
e.layout.Free()
e.layout = ui.NewTextLayout(e.Text, e.Font, width)
e.lText = e.Text
e.lFont = e.Font
} else {
e.layout.SetWidth(width)
}
return e.layout.Extents()
}