zeni/go-chart
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tweaks.

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This commit is contained in:
Will Charczuk 2016-07-07 17:50:16 -07:00
parent 04bef9cad8
commit b10ead7cc1
4 changed files with 56 additions and 62 deletions
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52
chart.go
View file

@ -29,32 +29,36 @@ type Chart struct {
// GetCanvasTop gets the top corner pixel.
func (c Chart) GetCanvasTop() int {
return c.Canvas.Padding.GetTop(DefaultCanvasPadding.Top)
return c.Background.Padding.GetTop(DefaultBackgroundPadding.Top)
}
// GetCanvasLeft gets the left corner pixel.
func (c Chart) GetCanvasLeft() int {
return c.Canvas.Padding.GetLeft(DefaultCanvasPadding.Left)
return c.Background.Padding.GetLeft(DefaultBackgroundPadding.Left)
}
// GetCanvasBottom gets the bottom corner pixel.
func (c Chart) GetCanvasBottom() int {
return c.Height - c.Canvas.Padding.GetBottom(DefaultCanvasPadding.Bottom)
return c.Height - c.Background.Padding.GetBottom(DefaultBackgroundPadding.Bottom)
}
// GetCanvasRight gets the right corner pixel.
func (c Chart) GetCanvasRight() int {
return c.Width - c.Canvas.Padding.GetRight(DefaultCanvasPadding.Right)
return c.Width - c.Background.Padding.GetRight(DefaultBackgroundPadding.Right)
}
// GetCanvasWidth returns the width of the canvas.
func (c Chart) GetCanvasWidth() int {
return c.Width - (c.Canvas.Padding.GetLeft(DefaultCanvasPadding.Left) + c.Canvas.Padding.GetRight(DefaultCanvasPadding.Right))
pl := c.Background.Padding.GetLeft(DefaultBackgroundPadding.Left)
pr := c.Background.Padding.GetRight(DefaultBackgroundPadding.Right)
return c.Width - (pl + pr)
}
// GetCanvasHeight returns the height of the canvas.
func (c Chart) GetCanvasHeight() int {
return c.Height - (c.Canvas.Padding.GetTop(DefaultCanvasPadding.Top) + c.Canvas.Padding.GetBottom(DefaultCanvasPadding.Bottom))
pt := c.Background.Padding.GetTop(DefaultBackgroundPadding.Top)
pb := c.Background.Padding.GetBottom(DefaultBackgroundPadding.Bottom)
return c.Height - (pt + pb)
}
// GetFont returns the text font.
@ -79,8 +83,8 @@ func (c *Chart) Render(provider RendererProvider, w io.Writer) error {
c.drawBackground(r)
c.drawCanvas(r)
c.drawAxes(r, xrange, yrange)
for _, series := range c.Series {
c.drawSeries(r, series, xrange, yrange)
for index, series := range c.Series {
c.drawSeries(r, index, series, xrange, yrange)
}
c.drawTitle(r)
return r.Save(w)
@ -162,7 +166,7 @@ func (c Chart) drawCanvas(r Renderer) {
func (c Chart) drawAxes(r Renderer, xrange, yrange Range) {
if c.Axes.Show {
r.SetStrokeColor(c.Axes.GetStrokeColor(DefaultAxisColor))
r.SetLineWidth(c.Axes.GetStrokeWidth(DefaultLineWidth))
r.SetLineWidth(c.Axes.GetStrokeWidth(DefaultStrokeWidth))
r.MoveTo(c.GetCanvasLeft(), c.GetCanvasBottom())
r.LineTo(c.GetCanvasRight(), c.GetCanvasBottom())
r.LineTo(c.GetCanvasRight(), c.GetCanvasTop())
@ -173,46 +177,46 @@ func (c Chart) drawAxes(r Renderer, xrange, yrange Range) {
}
func (c Chart) drawAxesLabels(r Renderer, xrange, yrange Range) {
// do x axis
// do y axis
}
func (c Chart) drawSeries(r Renderer, s Series, xrange, yrange Range) {
r.SetStrokeColor(s.GetStyle().GetStrokeColor(DefaultLineColor))
r.SetLineWidth(s.GetStyle().GetStrokeWidth(DefaultLineWidth))
func (c Chart) drawSeries(r Renderer, index int, s Series, xrange, yrange Range) {
r.SetStrokeColor(s.GetStyle().GetStrokeColor(GetDefaultSeriesStrokeColor(index)))
r.SetLineWidth(s.GetStyle().GetStrokeWidth(DefaultStrokeWidth))
if s.Len() == 0 {
return
}
px := c.Canvas.Padding.GetLeft(DefaultCanvasPadding.Left)
py := c.Canvas.Padding.GetTop(DefaultCanvasPadding.Top)
cx := c.GetCanvasLeft()
cy := c.GetCanvasTop()
cw := c.GetCanvasWidth()
v0x, v0y := s.GetValue(0)
x0 := cw - xrange.Translate(v0x)
y0 := yrange.Translate(v0y)
r.MoveTo(x0+px, y0+py)
r.MoveTo(x0+cx, y0+cy)
var vx, vy float64
var x, y int
for index := 1; index < s.Len(); index++ {
vx, vy = s.GetValue(index)
for i := 1; i < s.Len(); i++ {
vx, vy = s.GetValue(i)
x = cw - xrange.Translate(vx)
y = yrange.Translate(vy)
r.LineTo(x+px, y+py)
r.LineTo(x+cx, y+cy)
}
r.Stroke()
c.drawFinalValueLabel(r, s, yrange)
c.drawFinalValueLabel(r, index, s, yrange)
}
func (c Chart) drawFinalValueLabel(r Renderer, s Series, yrange Range) {
func (c Chart) drawFinalValueLabel(r Renderer, index int, s Series, yrange Range) {
if c.FinalValueLabel.Show {
_, lv := s.GetValue(s.Len() - 1)
_, ll := s.GetLabel(s.Len() - 1)
py := c.Canvas.Padding.GetTop(DefaultCanvasPadding.Top)
py := c.GetCanvasTop()
ly := yrange.Translate(lv) + py
r.SetFontSize(c.FinalValueLabel.GetFontSize(DefaultFinalLabelFontSize))
@ -245,7 +249,7 @@ func (c Chart) drawFinalValueLabel(r Renderer, s Series, yrange Range) {
//draw the shape...
r.SetFillColor(c.FinalValueLabel.GetFillColor(DefaultFinalLabelBackgroundColor))
r.SetStrokeColor(c.FinalValueLabel.GetStrokeColor(s.GetStyle().GetStrokeColor(DefaultLineColor)))
r.SetStrokeColor(c.FinalValueLabel.GetStrokeColor(s.GetStyle().GetStrokeColor(GetDefaultSeriesStrokeColor(index))))
r.SetLineWidth(c.FinalValueLabel.GetStrokeWidth(DefaultAxisLineWidth))
r.MoveTo(cx, ly)
r.LineTo(ltlx, ltly)

43
defaults.go
View file

@ -12,8 +12,8 @@ const (
DefaultChartHeight = 400
// DefaultChartWidth is the default chart width.
DefaultChartWidth = 200
// DefaultLineWidth is the default chart line width.
DefaultLineWidth = 2.0
// DefaultStrokeWidth is the default chart line/stroke width.
DefaultStrokeWidth = 1.0
// DefaultAxisLineWidth is the line width of the axis lines.
DefaultAxisLineWidth = 1.0
//DefaultDPI is the default dots per inch for the chart.
@ -24,26 +24,18 @@ const (
DefaultFontSize = 10.0
// DefaultTitleFontSize is the default title font size.
DefaultTitleFontSize = 18.0
// DefaultDateFormat is the default date format.
DefaultDateFormat = "2006-01-02"
)
const (
// DefaultFinalLabelDeltaWidth is the width of the left triangle out of the final label.
DefaultFinalLabelDeltaWidth = 10
// DefaultFinalLabelFontSize is the font size of the final label.
DefaultFinalLabelFontSize = 10.0
)
var (
// DefaultFinalLabelPadding is the padding around the final label.
DefaultFinalLabelPadding = Box{Top: 5, Left: 0, Right: 5, Bottom: 5}
// DefaultDateFormat is the default date format.
DefaultDateFormat = "2006-01-02"
)
var (
// DefaultBackgroundColor is the default chart background color.
// It is equivalent to css color:white.
DefaultBackgroundColor = color.RGBA{R: 239, G: 239, B: 239, A: 255} //color.RGBA{R: 255, G: 255, B: 255, A: 255}
DefaultBackgroundColor = color.RGBA{R: 255, G: 255, B: 255, A: 255}
// DefaultCanvasColor is the default chart canvas color.
// It is equivalent to css color:white.
DefaultCanvasColor = color.RGBA{R: 255, G: 255, B: 255, A: 255}
@ -56,9 +48,6 @@ var (
// DefaultStrokeColor is the default chart border color.
// It is equivalent to #efefef.
DefaultStrokeColor = color.RGBA{R: 239, G: 239, B: 239, A: 255}
// DefaultLineColor is the default (1st) series line color.
// It is equivalent to #0074d9.
DefaultLineColor = color.RGBA{R: 0, G: 116, B: 217, A: 255}
// DefaultFillColor is the default fill color.
// It is equivalent to #0074d9.
DefaultFillColor = color.RGBA{R: 0, G: 217, B: 116, A: 255}
@ -67,8 +56,26 @@ var (
)
var (
// DefaultCanvasPadding is the default canvas padding config.
DefaultCanvasPadding = Box{Top: 5, Left: 5, Right: 15, Bottom: 15}
// DefaultSeriesStrokeColors are a couple default series colors.
DefaultSeriesStrokeColors = []color.RGBA{
color.RGBA{R: 0, G: 116, B: 217, A: 255},
color.RGBA{R: 0, G: 217, B: 116, A: 255},
color.RGBA{R: 217, G: 0, B: 116, A: 255},
}
)
// GetDefaultSeriesStrokeColor returns a color from the default list by index.
// NOTE: the index will wrap around (using a modulo).g
func GetDefaultSeriesStrokeColor(index int) color.RGBA {
finalIndex := index % len(DefaultSeriesStrokeColors)
return DefaultSeriesStrokeColors[finalIndex]
}
var (
// DefaultFinalLabelPadding is the padding around the final label.
DefaultFinalLabelPadding = Box{Top: 5, Left: 0, Right: 5, Bottom: 5}
// DefaultBackgroundPadding is the default canvas padding config.
DefaultBackgroundPadding = Box{Top: 5, Left: 5, Right: 40, Bottom: 40}
)
var (

4
style.go
View file

@ -24,7 +24,7 @@ func (s Style) GetStrokeColor(defaults ...color.RGBA) color.RGBA {
if len(defaults) > 0 {
return defaults[0]
}
return DefaultLineColor
return DefaultStrokeColor
}
return s.StrokeColor
}
@ -46,7 +46,7 @@ func (s Style) GetStrokeWidth(defaults ...float64) float64 {
if len(defaults) > 0 {
return defaults[0]
}
return DefaultLineWidth
return DefaultStrokeWidth
}
return s.StrokeWidth
}

17
testserver/main.go
View file

@ -2,7 +2,6 @@ package main
import (
"bytes"
"image/color"
"log"
"time"
@ -34,31 +33,15 @@ func main() {
Show: true,
StrokeWidth: 1.0,
},
YRange: chart.Range{
Min: 0.0,
Max: 7.0,
},
FinalValueLabel: chart.Style{
Show: true,
},
Series: []chart.Series{
chart.TimeSeries{
Name: "goog",
Style: chart.Style{
StrokeWidth: 1.0,
},
XValues: []time.Time{now.AddDate(0, 0, -4), now.AddDate(0, 0, -3), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)},
YValues: []float64{2.5, 5.0, 2.0, 3.0},
},
chart.TimeSeries{
Name: "aapl",
Style: chart.Style{
StrokeWidth: 1.0,
StrokeColor: color.RGBA{R: 0, G: 217, B: 116, A: 255},
},
XValues: []time.Time{now.AddDate(0, 0, -5), now.AddDate(0, 0, -4), now.AddDate(0, 0, -2), now.AddDate(0, 0, -1)},
YValues: []float64{3.0, 2.7, 2.0, 1.1},
},
},
}