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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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20
vector_renderer.go
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@ -4,6 +4,7 @@ import (
"bytes"
"fmt"
"io"
"math"
"strings"
"golang.org/x/image/font"
@ -82,7 +83,24 @@ func (vr *vectorRenderer) QuadCurveTo(cx, cy, x, y int) {
}
func (vr *vectorRenderer) ArcTo(cx, cy int, rx, ry, startAngle, delta float64) {
vr.p = append(vr.p, fmt.Sprintf("A %d %d %0.2f 1 1 %d %d", int(rx), int(ry), delta, cx, cy))
startAngle = RadianAdd(startAngle, _pi2)
endAngle := RadianAdd(startAngle, delta)
startx := cx + int(rx*math.Sin(startAngle))
starty := cy - int(ry*math.Cos(startAngle))
if len(vr.p) > 0 {
vr.p = append(vr.p, fmt.Sprintf("L %d %d", startx, starty))
} else {
vr.p = append(vr.p, fmt.Sprintf("M %d %d", startx, starty))
}
endx := cx + int(rx*math.Sin(endAngle))
endy := cy - int(ry*math.Cos(endAngle))
dd := RadiansToDegrees(delta)
vr.p = append(vr.p, fmt.Sprintf("A %d %d %0.2f 0 1 %d %d", int(rx), int(ry), dd, endx, endy))
}
// Close closes a shape.