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can rotate text + add y axis names

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This commit is contained in:
Will Charczuk 2016-08-06 21:59:46 -07:00
parent 3607d732d9
commit 718678b421
34 changed files with 102 additions and 20 deletions
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28
raster_renderer.go
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@ -28,6 +28,8 @@ type rasterRenderer struct {
i *image.RGBA
gc *drawing.RasterGraphicContext
rotateRadians float64
s Style
}
@ -139,10 +141,11 @@ func (rr *rasterRenderer) SetFontColor(c drawing.Color) {
// Text implements the interface method.
func (rr *rasterRenderer) Text(body string, x, y int) {
xf, yf := rr.getCoords(x, y)
rr.gc.SetFont(rr.s.Font)
rr.gc.SetFontSize(rr.s.FontSize)
rr.gc.SetFillColor(rr.s.FontColor)
rr.gc.CreateStringPath(body, float64(x), float64(y))
rr.gc.CreateStringPath(body, float64(xf), float64(yf))
rr.gc.Fill()
}
@ -182,6 +185,29 @@ func (rr *rasterRenderer) MeasureText(body string) Box {
}
}
// SetTextRotation sets a text rotation.
func (rr *rasterRenderer) SetTextRotation(radians float64) {
rr.rotateRadians = radians
}
func (rr *rasterRenderer) getCoords(x, y int) (xf, yf int) {
if rr.rotateRadians == 0 {
xf = x
yf = y
return
}
rr.gc.Translate(float64(x), float64(y))
rr.gc.Rotate(rr.rotateRadians)
return
}
// ClearTextRotation clears text rotation.
func (rr *rasterRenderer) ClearTextRotation() {
rr.gc.SetMatrixTransform(drawing.NewIdentityMatrix())
rr.rotateRadians = 0
}
// Save implements the interface method.
func (rr *rasterRenderer) Save(w io.Writer) error {
return png.Encode(w, rr.i)