aw/go-chart
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refactoring how the raster renderer handles styles.

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This commit is contained in:
Will Charczuk 2016-07-14 18:51:42 -07:00
parent 7bce09c859
commit 16721a5844
2 changed files with 22 additions and 17 deletions
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4
drawing_helpers.go
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@ -143,7 +143,7 @@ func DrawBox(r Renderer, b Box, s Style) {
// DrawText draws text with a given style.
func DrawText(r Renderer, text string, x, y int, s Style) {
r.SetFillColor(s.GetFillColor(DefaultTextColor))
r.SetFontColor(s.GetFontColor(DefaultTextColor))
r.SetStrokeColor(s.GetStrokeColor())
r.SetStrokeWidth(s.GetStrokeWidth())
r.SetFont(s.GetFont())
@ -154,7 +154,7 @@ func DrawText(r Renderer, text string, x, y int, s Style) {
// DrawTextCentered draws text with a given style centered.
func DrawTextCentered(r Renderer, text string, x, y int, s Style) {
r.SetFillColor(s.GetFillColor(DefaultTextColor))
r.SetFontColor(s.GetFontColor(DefaultTextColor))
r.SetStrokeColor(s.GetStrokeColor())
r.SetStrokeWidth(s.GetStrokeWidth())
r.SetFont(s.GetFont())

35
raster_renderer.go
View File

@ -2,7 +2,6 @@ package chart
import (
"image"
"image/color"
"image/png"
"io"
"math"
@ -29,9 +28,7 @@ type rasterRenderer struct {
i *image.RGBA
gc *drawing.RasterGraphicContext
fontSize float64
fontColor color.Color
f *truetype.Font
s Style
}
// GetDPI returns the dpi.
@ -46,22 +43,22 @@ func (rr *rasterRenderer) SetDPI(dpi float64) {
// SetStrokeColor implements the interface method.
func (rr *rasterRenderer) SetStrokeColor(c drawing.Color) {
rr.gc.SetStrokeColor(c)
rr.s.StrokeColor = c
}
// SetLineWidth implements the interface method.
func (rr *rasterRenderer) SetStrokeWidth(width float64) {
rr.gc.SetLineWidth(width)
rr.s.StrokeWidth = width
}
// StrokeDashArray sets the stroke dash array.
func (rr *rasterRenderer) SetStrokeDashArray(dashArray []float64) {
rr.gc.SetLineDash(dashArray, 0.0)
rr.s.StrokeDashArray = dashArray
}
// SetFillColor implements the interface method.
func (rr *rasterRenderer) SetFillColor(c drawing.Color) {
rr.gc.SetFillColor(c)
rr.s.FillColor = c
}
// MoveTo implements the interface method.
@ -81,16 +78,22 @@ func (rr *rasterRenderer) Close() {
// Stroke implements the interface method.
func (rr *rasterRenderer) Stroke() {
rr.gc.SetStrokeColor(rr.s.StrokeColor)
rr.gc.SetLineWidth(rr.s.StrokeWidth)
rr.gc.Stroke()
}
// Fill implements the interface method.
func (rr *rasterRenderer) Fill() {
rr.gc.SetFillColor(rr.s.FillColor)
rr.gc.Fill()
}
// FillStroke implements the interface method.
func (rr *rasterRenderer) FillStroke() {
rr.gc.SetFillColor(rr.s.FillColor)
rr.gc.SetStrokeColor(rr.s.StrokeColor)
rr.gc.SetLineWidth(rr.s.StrokeWidth)
rr.gc.FillStroke()
}
@ -109,31 +112,33 @@ func (rr *rasterRenderer) Circle(radius float64, x, y int) {
// SetFont implements the interface method.
func (rr *rasterRenderer) SetFont(f *truetype.Font) {
rr.f = f
rr.gc.SetFont(f)
rr.s.Font = f
}
// SetFontSize implements the interface method.
func (rr *rasterRenderer) SetFontSize(size float64) {
rr.fontSize = size
rr.gc.SetFontSize(size)
rr.s.FontSize = size
}
// SetFontColor implements the interface method.
func (rr *rasterRenderer) SetFontColor(c drawing.Color) {
rr.fontColor = c
rr.gc.SetFillColor(c)
rr.gc.SetStrokeColor(c)
rr.s.FontColor = c
}
// Text implements the interface method.
func (rr *rasterRenderer) Text(body string, x, y int) {
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.Fill()
}
// MeasureText returns the height and width in pixels of a string.
func (rr *rasterRenderer) MeasureText(body string) Box {
rr.gc.SetFont(rr.s.Font)
rr.gc.SetFontSize(rr.s.FontSize)
rr.gc.SetFillColor(rr.s.FontColor)
l, t, r, b, err := rr.gc.GetStringBounds(body)
if err != nil {
return Box{}