123 lines
3.1 KiB
Go
123 lines
3.1 KiB
Go
package chart
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import "math"
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// DrawLineSeries draws a line series with a renderer.
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func DrawLineSeries(r Renderer, canvasBox Box, xrange, yrange Range, s Style, vs ValueProvider) {
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if vs.Len() == 0 {
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return
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}
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ct := canvasBox.Top
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cb := canvasBox.Bottom
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cr := canvasBox.Right
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v0x, v0y := vs.GetValue(0)
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x0 := cr - xrange.Translate(v0x)
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y0 := yrange.Translate(v0y) + ct
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var vx, vy float64
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var x, y int
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fill := s.GetFillColor()
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if !fill.IsZero() {
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r.SetFillColor(fill)
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r.MoveTo(x0, y0)
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for i := 1; i < vs.Len(); i++ {
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vx, vy = vs.GetValue(i)
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x = cr - xrange.Translate(vx)
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y = yrange.Translate(vy) + ct
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r.LineTo(x, y)
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}
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r.LineTo(x, cb)
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r.LineTo(x0, cb)
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r.Close()
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r.Fill()
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}
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stroke := s.GetStrokeColor()
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r.SetStrokeColor(stroke)
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r.SetStrokeWidth(s.GetStrokeWidth(DefaultStrokeWidth))
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r.MoveTo(x0, y0)
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for i := 1; i < vs.Len(); i++ {
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vx, vy = vs.GetValue(i)
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x = cr - xrange.Translate(vx)
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y = yrange.Translate(vy) + ct
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r.LineTo(x, y)
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}
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r.Stroke()
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}
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// MeasureAnnotation measures how big an annotation would be.
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func MeasureAnnotation(r Renderer, canvasBox Box, xrange, yrange Range, s Style, lx, ly int, label string) Box {
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r.SetFont(s.GetFont())
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r.SetFontSize(s.GetFontSize(DefaultAnnotationFontSize))
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textWidth, _ := r.MeasureText(label)
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textHeight := int(math.Floor(DefaultAnnotationFontSize))
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halfTextHeight := textHeight >> 1
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pt := s.Padding.GetTop(DefaultAnnotationPadding.Top)
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pl := s.Padding.GetLeft(DefaultAnnotationPadding.Left)
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pr := s.Padding.GetRight(DefaultAnnotationPadding.Right)
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pb := s.Padding.GetBottom(DefaultAnnotationPadding.Bottom)
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ltly := ly - (pt + halfTextHeight)
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ltrx := lx + pl + pr + textWidth
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lbry := ly + (pb + halfTextHeight)
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return Box{
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Top: ltly,
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Left: lx,
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Right: ltrx,
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Bottom: lbry,
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Width: ltrx - lx,
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Height: lbry - ltly,
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}
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}
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// DrawAnnotation draws an anotation with a renderer.
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func DrawAnnotation(r Renderer, canvasBox Box, xrange, yrange Range, s Style, lx, ly int, label string) {
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r.SetFont(s.GetFont())
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r.SetFontSize(s.GetFontSize(DefaultAnnotationFontSize))
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textWidth, textHeight := r.MeasureText(label)
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halfTextHeight := textHeight >> 1
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pt := s.Padding.GetTop(DefaultAnnotationPadding.Top)
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pl := s.Padding.GetLeft(DefaultAnnotationPadding.Left)
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pr := s.Padding.GetRight(DefaultAnnotationPadding.Right)
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pb := s.Padding.GetBottom(DefaultAnnotationPadding.Bottom)
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textX := lx + pl + DefaultAnnotationDeltaWidth
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textY := ly + halfTextHeight
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ltlx := lx + pl + DefaultAnnotationDeltaWidth
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ltly := ly - (pt + halfTextHeight)
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ltrx := lx + pl + pr + textWidth
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ltry := ly - (pt + halfTextHeight)
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lbrx := lx + pl + pr + textWidth
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lbry := ly + (pb + halfTextHeight)
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lblx := lx + DefaultAnnotationDeltaWidth
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lbly := ly + (pb + halfTextHeight)
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//draw the shape...
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r.SetFillColor(s.GetFillColor(DefaultAnnotationFillColor))
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r.SetStrokeColor(s.GetStrokeColor())
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r.SetStrokeWidth(s.GetStrokeWidth())
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r.MoveTo(lx, ly)
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r.LineTo(ltlx, ltly)
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r.LineTo(ltrx, ltry)
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r.LineTo(lbrx, lbry)
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r.LineTo(lblx, lbly)
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r.LineTo(lx, ly)
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r.Close()
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r.FillStroke()
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r.SetFontColor(s.GetFontColor(DefaultTextColor))
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r.Text(label, textX, textY)
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}
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