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vector renderer works

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This commit is contained in:
Will Charczuk 2016-07-28 13:22:18 -07:00
parent b600cb1994
commit 3d9cf0da0c
5 changed files with 129 additions and 16 deletions
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13
pie_chart.go
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@ -3,7 +3,6 @@ package chart
import (
"errors"
"io"
"math"
"github.com/golang/freetype/truetype"
)
@ -142,14 +141,15 @@ func (pc PieChart) drawSlices(r Renderer, canvasBox Box, values []PieChartValue)
cx, cy := canvasBox.Center()
diameter := MinInt(canvasBox.Width(), canvasBox.Height())
radius := float64(diameter >> 1)
radius2 := (radius * 2.0) / 3.0
labelRadius := (radius * 2.0) / 3.0
// draw the pie slices
var rads, delta, delta2, total float64
var lx, ly int
for index, v := range values {
v.Style.InheritFrom(pc.stylePieChartValue(index)).PersistToRenderer(r)
r.MoveTo(cx, cy)
r.MoveTo(cx, cy)
rads = PercentToRadians(total)
delta = PercentToRadians(v.Value)
@ -161,13 +161,14 @@ func (pc PieChart) drawSlices(r Renderer, canvasBox Box, values []PieChartValue)
total = total + v.Value
}
// draw the labels
total = 0
for index, v := range values {
v.Style.InheritFrom(pc.stylePieChartValue(index)).PersistToRenderer(r)
if len(v.Label) > 0 {
delta2 = RadianAdd(PercentToRadians(total+(v.Value/2.0)), _pi2)
lx = cx + int(radius2*math.Sin(delta2))
ly = cy - int(radius2*math.Cos(delta2))
delta2 = PercentToRadians(total + (v.Value / 2.0))
delta2 = RadianAdd(delta2, _pi2)
lx, ly = CirclePoint(cx, cy, labelRadius, delta2)
tb := r.MeasureText(v.Label)
lx = lx - (tb.Width() >> 1)