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color maps

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This commit is contained in:
Will Charczuk 2017-04-14 17:43:52 -07:00
parent 4f15ced303
commit fdb1b191b2
11 changed files with 577 additions and 170 deletions
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19
_examples/scatter/main.go
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@ -14,18 +14,19 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
Series: []chart.Series{
chart.ContinuousSeries{
Style: chart.Style{
Show: true,
StrokeWidth: chart.Disabled,
DotWidth: 3,
Show: true,
StrokeWidth: chart.Disabled,
DotWidthProvider: func(rx, ry, x, y float64) float64 { return 10 * (y / ry) },
DotColorProvider: chart.Vidris,
},
XValues: chart.Sequence.Random(8192, 1024),
YValues: chart.Sequence.Random(8192, 1024),
XValues: chart.Sequence.Random(128, 1024),
YValues: chart.Sequence.Random(128, 1024),
},
},
}
res.Header().Set("Content-Type", chart.ContentTypeSVG)
err := graph.Render(chart.SVG, res)
res.Header().Set("Content-Type", chart.ContentTypePNG)
err := graph.Render(chart.PNG, res)
if err != nil {
log.Println(err.Error())
}
@ -49,8 +50,8 @@ func unit(res http.ResponseWriter, req *http.Request) {
},
}
res.Header().Set("Content-Type", chart.ContentTypeSVG)
err := graph.Render(chart.SVG, res)
res.Header().Set("Content-Type", chart.ContentTypePNG)
err := graph.Render(chart.PNG, res)
if err != nil {
log.Println(err.Error())
}

24
bar_chart.go
View File

@ -14,6 +14,8 @@ type BarChart struct {
Title string
TitleStyle Style
ColorPalette ColorPalette
Width int
Height int
DPI float64
@ -407,23 +409,23 @@ func (bc BarChart) getBackgroundStyle() Style {
func (bc BarChart) styleDefaultsBackground() Style {
return Style{
FillColor: DefaultBackgroundColor,
StrokeColor: DefaultBackgroundStrokeColor,
FillColor: bc.GetColorPalette().BackgroundColor(),
StrokeColor: bc.GetColorPalette().BackgroundStrokeColor(),
StrokeWidth: DefaultStrokeWidth,
}
}
func (bc BarChart) styleDefaultsBar(index int) Style {
return Style{
StrokeColor: GetAlternateColor(index),
StrokeColor: bc.GetColorPalette().GetSeriesColor(index),
StrokeWidth: 3.0,
FillColor: GetAlternateColor(index),
FillColor: bc.GetColorPalette().GetSeriesColor(index),
}
}
func (bc BarChart) styleDefaultsTitle() Style {
return bc.TitleStyle.InheritFrom(Style{
FontColor: DefaultTextColor,
FontColor: bc.GetColorPalette().TextColor(),
Font: bc.GetFont(),
FontSize: bc.getTitleFontSize(),
TextHorizontalAlign: TextHorizontalAlignCenter,
@ -448,10 +450,10 @@ func (bc BarChart) getTitleFontSize() float64 {
func (bc BarChart) styleDefaultsAxes() Style {
return Style{
StrokeColor: DefaultAxisColor,
StrokeColor: bc.GetColorPalette().AxisStrokeColor(),
Font: bc.GetFont(),
FontSize: DefaultAxisFontSize,
FontColor: DefaultAxisColor,
FontColor: bc.GetColorPalette().TextColor(),
TextHorizontalAlign: TextHorizontalAlignCenter,
TextVerticalAlign: TextVerticalAlignTop,
TextWrap: TextWrapWord,
@ -463,3 +465,11 @@ func (bc BarChart) styleDefaultsElements() Style {
Font: bc.GetFont(),
}
}
// GetColorPalette returns the color palette for the chart.
func (bc BarChart) GetColorPalette() ColorPalette {
if bc.ColorPalette != nil {
return bc.ColorPalette
}
return AlternateColorPalette
}

29
chart.go
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@ -14,6 +14,8 @@ type Chart struct {
Title string
TitleStyle Style
ColorPalette ColorPalette
Width int
Height int
DPI float64
@ -490,7 +492,7 @@ func (c Chart) drawSeries(r Renderer, canvasBox Box, xrange, yrange, yrangeAlt R
func (c Chart) drawTitle(r Renderer) {
if len(c.Title) > 0 && c.TitleStyle.Show {
r.SetFont(c.TitleStyle.GetFont(c.GetFont()))
r.SetFontColor(c.TitleStyle.GetFontColor(DefaultTextColor))
r.SetFontColor(c.TitleStyle.GetFontColor(c.GetColorPalette().TextColor()))
titleFontSize := c.TitleStyle.GetFontSize(DefaultTitleFontSize)
r.SetFontSize(titleFontSize)
@ -508,25 +510,24 @@ func (c Chart) drawTitle(r Renderer) {
func (c Chart) styleDefaultsBackground() Style {
return Style{
FillColor: DefaultBackgroundColor,
StrokeColor: DefaultBackgroundStrokeColor,
FillColor: c.GetColorPalette().BackgroundColor(),
StrokeColor: c.GetColorPalette().BackgroundStrokeColor(),
StrokeWidth: DefaultBackgroundStrokeWidth,
}
}
func (c Chart) styleDefaultsCanvas() Style {
return Style{
FillColor: DefaultCanvasColor,
StrokeColor: DefaultCanvasStrokeColor,
FillColor: c.GetColorPalette().CanvasColor(),
StrokeColor: c.GetColorPalette().CanvasStrokeColor(),
StrokeWidth: DefaultCanvasStrokeWidth,
}
}
func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
strokeColor := GetDefaultColor(seriesIndex)
return Style{
DotColor: strokeColor,
StrokeColor: strokeColor,
DotColor: c.GetColorPalette().GetSeriesColor(seriesIndex),
StrokeColor: c.GetColorPalette().GetSeriesColor(seriesIndex),
StrokeWidth: DefaultSeriesLineWidth,
Font: c.GetFont(),
FontSize: DefaultFontSize,
@ -536,9 +537,9 @@ func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
func (c Chart) styleDefaultsAxes() Style {
return Style{
Font: c.GetFont(),
FontColor: DefaultAxisColor,
FontColor: c.GetColorPalette().TextColor(),
FontSize: DefaultAxisFontSize,
StrokeColor: DefaultAxisColor,
StrokeColor: c.GetColorPalette().AxisStrokeColor(),
StrokeWidth: DefaultAxisLineWidth,
}
}
@ -549,6 +550,14 @@ func (c Chart) styleDefaultsElements() Style {
}
}
// GetColorPalette returns the color palette for the chart.
func (c Chart) GetColorPalette() ColorPalette {
if c.ColorPalette != nil {
return c.ColorPalette
}
return DefaultColorPalette
}
// Box returns the chart bounds as a box.
func (c Chart) Box() Box {
dpr := c.Background.Padding.GetRight(DefaultBackgroundPadding.Right)

184
colors.go Normal file
View File

@ -0,0 +1,184 @@
package chart
import "github.com/wcharczuk/go-chart/drawing"
var (
// ColorWhite is white.
ColorWhite = drawing.Color{R: 255, G: 255, B: 255, A: 255}
// ColorBlue is the basic theme blue color.
ColorBlue = drawing.Color{R: 0, G: 116, B: 217, A: 255}
// ColorCyan is the basic theme cyan color.
ColorCyan = drawing.Color{R: 0, G: 217, B: 210, A: 255}
// ColorGreen is the basic theme green color.
ColorGreen = drawing.Color{R: 0, G: 217, B: 101, A: 255}
// ColorRed is the basic theme red color.
ColorRed = drawing.Color{R: 217, G: 0, B: 116, A: 255}
// ColorOrange is the basic theme orange color.
ColorOrange = drawing.Color{R: 217, G: 101, B: 0, A: 255}
// ColorYellow is the basic theme yellow color.
ColorYellow = drawing.Color{R: 217, G: 210, B: 0, A: 255}
// ColorBlack is the basic theme black color.
ColorBlack = drawing.Color{R: 51, G: 51, B: 51, A: 255}
// ColorLightGray is the basic theme light gray color.
ColorLightGray = drawing.Color{R: 239, G: 239, B: 239, A: 255}
// ColorAlternateBlue is a alternate theme color.
ColorAlternateBlue = drawing.Color{R: 106, G: 195, B: 203, A: 255}
// ColorAlternateGreen is a alternate theme color.
ColorAlternateGreen = drawing.Color{R: 42, G: 190, B: 137, A: 255}
// ColorAlternateGray is a alternate theme color.
ColorAlternateGray = drawing.Color{R: 110, G: 128, B: 139, A: 255}
// ColorAlternateYellow is a alternate theme color.
ColorAlternateYellow = drawing.Color{R: 240, G: 174, B: 90, A: 255}
// ColorAlternateLightGray is a alternate theme color.
ColorAlternateLightGray = drawing.Color{R: 187, G: 190, B: 191, A: 255}
// ColorTransparent is a transparent (alpha zero) color.
ColorTransparent = drawing.Color{R: 1, G: 1, B: 1, A: 0}
)
var (
// DefaultBackgroundColor is the default chart background color.
// It is equivalent to css color:white.
DefaultBackgroundColor = ColorWhite
// DefaultBackgroundStrokeColor is the default chart border color.
// It is equivalent to color:white.
DefaultBackgroundStrokeColor = ColorWhite
// DefaultCanvasColor is the default chart canvas color.
// It is equivalent to css color:white.
DefaultCanvasColor = ColorWhite
// DefaultCanvasStrokeColor is the default chart canvas stroke color.
// It is equivalent to css color:white.
DefaultCanvasStrokeColor = ColorWhite
// DefaultTextColor is the default chart text color.
// It is equivalent to #333333.
DefaultTextColor = ColorBlack
// DefaultAxisColor is the default chart axis line color.
// It is equivalent to #333333.
DefaultAxisColor = ColorBlack
// DefaultStrokeColor is the default chart border color.
// It is equivalent to #efefef.
DefaultStrokeColor = ColorLightGray
// DefaultFillColor is the default fill color.
// It is equivalent to #0074d9.
DefaultFillColor = ColorBlue
// DefaultAnnotationFillColor is the default annotation background color.
DefaultAnnotationFillColor = ColorWhite
// DefaultGridLineColor is the default grid line color.
DefaultGridLineColor = ColorLightGray
)
var (
// DefaultColors are a couple default series colors.
DefaultColors = []drawing.Color{
ColorBlue,
ColorGreen,
ColorRed,
ColorCyan,
ColorOrange,
}
// DefaultAlternateColors are a couple alternate colors.
DefaultAlternateColors = []drawing.Color{
ColorAlternateBlue,
ColorAlternateGreen,
ColorAlternateGray,
ColorAlternateYellow,
ColorBlue,
ColorGreen,
ColorRed,
ColorCyan,
ColorOrange,
}
)
// GetDefaultColor returns a color from the default list by index.
// NOTE: the index will wrap around (using a modulo).
func GetDefaultColor(index int) drawing.Color {
finalIndex := index % len(DefaultColors)
return DefaultColors[finalIndex]
}
// GetAlternateColor returns a color from the default list by index.
// NOTE: the index will wrap around (using a modulo).
func GetAlternateColor(index int) drawing.Color {
finalIndex := index % len(DefaultAlternateColors)
return DefaultAlternateColors[finalIndex]
}
// ColorPalette is a set of colors that.
type ColorPalette interface {
BackgroundColor() drawing.Color
BackgroundStrokeColor() drawing.Color
CanvasColor() drawing.Color
CanvasStrokeColor() drawing.Color
AxisStrokeColor() drawing.Color
TextColor() drawing.Color
GetSeriesColor(index int) drawing.Color
}
// DefaultColorPalette represents the default palatte.
var DefaultColorPalette defaultColorPalette
type defaultColorPalette struct{}
func (dp defaultColorPalette) BackgroundColor() drawing.Color {
return DefaultBackgroundColor
}
func (dp defaultColorPalette) BackgroundStrokeColor() drawing.Color {
return DefaultBackgroundStrokeColor
}
func (dp defaultColorPalette) CanvasColor() drawing.Color {
return DefaultCanvasColor
}
func (dp defaultColorPalette) CanvasStrokeColor() drawing.Color {
return DefaultCanvasStrokeColor
}
func (dp defaultColorPalette) AxisStrokeColor() drawing.Color {
return DefaultAxisColor
}
func (dp defaultColorPalette) TextColor() drawing.Color {
return DefaultTextColor
}
func (dp defaultColorPalette) GetSeriesColor(index int) drawing.Color {
return GetDefaultColor(index)
}
// AlternateColorPalette represents the default palatte.
var AlternateColorPalette alternateColorPalette
type alternateColorPalette struct{}
func (ap alternateColorPalette) BackgroundColor() drawing.Color {
return DefaultBackgroundColor
}
func (ap alternateColorPalette) BackgroundStrokeColor() drawing.Color {
return DefaultBackgroundStrokeColor
}
func (ap alternateColorPalette) CanvasColor() drawing.Color {
return DefaultCanvasColor
}
func (ap alternateColorPalette) CanvasStrokeColor() drawing.Color {
return DefaultCanvasStrokeColor
}
func (ap alternateColorPalette) AxisStrokeColor() drawing.Color {
return DefaultAxisColor
}
func (ap alternateColorPalette) TextColor() drawing.Color {
return DefaultTextColor
}
func (ap alternateColorPalette) GetSeriesColor(index int) drawing.Color {
return GetAlternateColor(index)
}

132
defaults.go
View File

@ -1,12 +1,5 @@
package chart
import (
"sync"
"github.com/golang/freetype/truetype"
"github.com/wcharczuk/go-chart/drawing"
)
const (
// DefaultChartHeight is the default chart height.
DefaultChartHeight = 400
@ -82,96 +75,6 @@ const (
DefaultBarWidth = 50
)
var (
// ColorWhite is white.
ColorWhite = drawing.Color{R: 255, G: 255, B: 255, A: 255}
// ColorBlue is the basic theme blue color.
ColorBlue = drawing.Color{R: 0, G: 116, B: 217, A: 255}
// ColorCyan is the basic theme cyan color.
ColorCyan = drawing.Color{R: 0, G: 217, B: 210, A: 255}
// ColorGreen is the basic theme green color.
ColorGreen = drawing.Color{R: 0, G: 217, B: 101, A: 255}
// ColorRed is the basic theme red color.
ColorRed = drawing.Color{R: 217, G: 0, B: 116, A: 255}
// ColorOrange is the basic theme orange color.
ColorOrange = drawing.Color{R: 217, G: 101, B: 0, A: 255}
// ColorYellow is the basic theme yellow color.
ColorYellow = drawing.Color{R: 217, G: 210, B: 0, A: 255}
// ColorBlack is the basic theme black color.
ColorBlack = drawing.Color{R: 51, G: 51, B: 51, A: 255}
// ColorLightGray is the basic theme light gray color.
ColorLightGray = drawing.Color{R: 239, G: 239, B: 239, A: 255}
// ColorAlternateBlue is a alternate theme color.
ColorAlternateBlue = drawing.Color{R: 106, G: 195, B: 203, A: 255}
// ColorAlternateGreen is a alternate theme color.
ColorAlternateGreen = drawing.Color{R: 42, G: 190, B: 137, A: 255}
// ColorAlternateGray is a alternate theme color.
ColorAlternateGray = drawing.Color{R: 110, G: 128, B: 139, A: 255}
// ColorAlternateYellow is a alternate theme color.
ColorAlternateYellow = drawing.Color{R: 240, G: 174, B: 90, A: 255}
// ColorAlternateLightGray is a alternate theme color.
ColorAlternateLightGray = drawing.Color{R: 187, G: 190, B: 191, A: 255}
// ColorTransparent is a transparent (alpha zero) color.
ColorTransparent = drawing.Color{R: 1, G: 1, B: 1, A: 0}
)
var (
// DefaultBackgroundColor is the default chart background color.
// It is equivalent to css color:white.
DefaultBackgroundColor = ColorWhite
// DefaultBackgroundStrokeColor is the default chart border color.
// It is equivalent to color:white.
DefaultBackgroundStrokeColor = ColorWhite
// DefaultCanvasColor is the default chart canvas color.
// It is equivalent to css color:white.
DefaultCanvasColor = ColorWhite
// DefaultCanvasStrokeColor is the default chart canvas stroke color.
// It is equivalent to css color:white.
DefaultCanvasStrokeColor = ColorWhite
// DefaultTextColor is the default chart text color.
// It is equivalent to #333333.
DefaultTextColor = ColorBlack
// DefaultAxisColor is the default chart axis line color.
// It is equivalent to #333333.
DefaultAxisColor = ColorBlack
// DefaultStrokeColor is the default chart border color.
// It is equivalent to #efefef.
DefaultStrokeColor = ColorLightGray
// DefaultFillColor is the default fill color.
// It is equivalent to #0074d9.
DefaultFillColor = ColorBlue
// DefaultAnnotationFillColor is the default annotation background color.
DefaultAnnotationFillColor = ColorWhite
// DefaultGridLineColor is the default grid line color.
DefaultGridLineColor = ColorLightGray
)
var (
// DefaultColors are a couple default series colors.
DefaultColors = []drawing.Color{
ColorBlue,
ColorGreen,
ColorRed,
ColorCyan,
ColorOrange,
}
// DefaultAlternateColors are a couple alternate colors.
DefaultAlternateColors = []drawing.Color{
ColorAlternateBlue,
ColorAlternateGreen,
ColorAlternateGray,
ColorAlternateYellow,
ColorBlue,
ColorGreen,
ColorRed,
ColorCyan,
ColorOrange,
}
)
var (
// DashArrayDots is a dash array that represents '....' style stroke dashes.
DashArrayDots = []int{1, 1}
@ -183,20 +86,6 @@ var (
DashArrayDashesLarge = []int{10, 10}
)
// GetDefaultColor returns a color from the default list by index.
// NOTE: the index will wrap around (using a modulo).
func GetDefaultColor(index int) drawing.Color {
finalIndex := index % len(DefaultColors)
return DefaultColors[finalIndex]
}
// GetAlternateColor returns a color from the default list by index.
// NOTE: the index will wrap around (using a modulo).
func GetAlternateColor(index int) drawing.Color {
finalIndex := index % len(DefaultAlternateColors)
return DefaultAlternateColors[finalIndex]
}
var (
// DefaultAnnotationPadding is the padding around an annotation.
DefaultAnnotationPadding = Box{Top: 5, Left: 5, Right: 5, Bottom: 5}
@ -205,27 +94,6 @@ var (
DefaultBackgroundPadding = Box{Top: 5, Left: 5, Right: 5, Bottom: 5}
)
var (
_defaultFontLock sync.Mutex
_defaultFont *truetype.Font
)
// GetDefaultFont returns the default font (Roboto-Medium).
func GetDefaultFont() (*truetype.Font, error) {
if _defaultFont == nil {
_defaultFontLock.Lock()
defer _defaultFontLock.Unlock()
if _defaultFont == nil {
font, err := truetype.Parse(roboto)
if err != nil {
return nil, err
}
_defaultFont = font
}
}
return _defaultFont, nil
}
const (
// ContentTypePNG is the png mime type.
ContentTypePNG = "image/png"

15
draw.go
View File

@ -56,15 +56,26 @@ func (d draw) LineSeries(r Renderer, canvasBox Box, xrange, yrange Range, style
}
if style.ShouldDrawDot() {
dotWidth := style.GetDotWidth()
defaultDotWidth := style.GetDotWidth()
style.GetDotOptions().WriteDrawingOptionsToRenderer(r)
for i := 0; i < vs.Len(); i++ {
vx, vy = vs.GetValue(i)
x = cl + xrange.Translate(vx)
y = cb - yrange.Translate(vy)
dotWidth := defaultDotWidth
if style.DotWidthProvider != nil {
dotWidth = style.DotWidthProvider(xrange.GetDelta(), yrange.GetDelta(), vx, vy)
}
if style.DotColorProvider != nil {
dotColor := style.DotColorProvider(xrange.GetDelta(), yrange.GetDelta(), vx, vy)
r.SetFillColor(dotColor)
r.SetStrokeColor(dotColor)
}
r.Circle(dotWidth, x, y)
r.FillStroke()
}

28
font.go Normal file
View File

@ -0,0 +1,28 @@
package chart
import (
"sync"
"github.com/golang/freetype/truetype"
)
var (
_defaultFontLock sync.Mutex
_defaultFont *truetype.Font
)
// GetDefaultFont returns the default font (Roboto-Medium).
func GetDefaultFont() (*truetype.Font, error) {
if _defaultFont == nil {
_defaultFontLock.Lock()
defer _defaultFontLock.Unlock()
if _defaultFont == nil {
font, err := truetype.Parse(roboto)
if err != nil {
return nil, err
}
_defaultFont = font
}
}
return _defaultFont, nil
}

28
pie_chart.go
View File

@ -13,6 +13,8 @@ type PieChart struct {
Title string
TitleStyle Style
ColorPalette ColorPalette
Width int
Height int
DPI float64
@ -195,17 +197,17 @@ func (pc PieChart) getCanvasStyle() Style {
func (pc PieChart) styleDefaultsCanvas() Style {
return Style{
FillColor: DefaultCanvasColor,
StrokeColor: DefaultCanvasStrokeColor,
FillColor: pc.GetColorPalette().CanvasColor(),
StrokeColor: pc.GetColorPalette().CanvasStrokeColor(),
StrokeWidth: DefaultStrokeWidth,
}
}
func (pc PieChart) styleDefaultsPieChartValue() Style {
return Style{
StrokeColor: ColorWhite,
StrokeColor: pc.GetColorPalette().TextColor(),
StrokeWidth: 5.0,
FillColor: ColorWhite,
FillColor: pc.GetColorPalette().TextColor(),
}
}
@ -213,9 +215,9 @@ func (pc PieChart) stylePieChartValue(index int) Style {
return pc.SliceStyle.InheritFrom(Style{
StrokeColor: ColorWhite,
StrokeWidth: 5.0,
FillColor: GetAlternateColor(index),
FillColor: pc.GetColorPalette().GetSeriesColor(index),
FontSize: pc.getScaledFontSize(),
FontColor: ColorWhite,
FontColor: pc.GetColorPalette().TextColor(),
Font: pc.GetFont(),
})
}
@ -236,8 +238,8 @@ func (pc PieChart) getScaledFontSize() float64 {
func (pc PieChart) styleDefaultsBackground() Style {
return Style{
FillColor: DefaultBackgroundColor,
StrokeColor: DefaultBackgroundStrokeColor,
FillColor: pc.GetColorPalette().BackgroundColor(),
StrokeColor: pc.GetColorPalette().BackgroundStrokeColor(),
StrokeWidth: DefaultStrokeWidth,
}
}
@ -250,7 +252,7 @@ func (pc PieChart) styleDefaultsElements() Style {
func (pc PieChart) styleDefaultsTitle() Style {
return pc.TitleStyle.InheritFrom(Style{
FontColor: ColorWhite,
FontColor: pc.GetColorPalette().TextColor(),
Font: pc.GetFont(),
FontSize: pc.getTitleFontSize(),
TextHorizontalAlign: TextHorizontalAlignCenter,
@ -273,6 +275,14 @@ func (pc PieChart) getTitleFontSize() float64 {
return 10
}
// GetColorPalette returns the color palette for the chart.
func (pc PieChart) GetColorPalette() ColorPalette {
if pc.ColorPalette != nil {
return pc.ColorPalette
}
return AlternateColorPalette
}
// Box returns the chart bounds as a box.
func (pc PieChart) Box() Box {
dpr := pc.Background.Padding.GetRight(DefaultBackgroundPadding.Right)

8
style.go
View File

@ -45,6 +45,9 @@ type Style struct {
DotColor drawing.Color
DotWidth float64
DotWidthProvider SizeProvider
DotColorProvider ColorProvider
FillColor drawing.Color
FontSize float64
@ -355,6 +358,9 @@ func (s Style) InheritFrom(defaults Style) (final Style) {
final.DotColor = s.GetDotColor(defaults.DotColor)
final.DotWidth = s.GetDotWidth(defaults.DotWidth)
final.DotWidthProvider = s.DotWidthProvider
final.DotColorProvider = s.DotColorProvider
final.FillColor = s.GetFillColor(defaults.FillColor)
final.FontColor = s.GetFontColor(defaults.FontColor)
final.FontSize = s.GetFontSize(defaults.FontSize)
@ -426,7 +432,7 @@ func (s Style) ShouldDrawStroke() bool {
// ShouldDrawDot tells drawing functions if they should draw the dot.
func (s Style) ShouldDrawDot() bool {
return !s.DotColor.IsZero() && s.DotWidth > 0
return (!s.DotColor.IsZero() && s.DotWidth > 0) || s.DotColorProvider != nil || s.DotWidthProvider != nil
}
// ShouldDrawFill tells drawing functions if they should draw the stroke.

8
value_provider.go
View File

@ -1,5 +1,7 @@
package chart
import "github.com/wcharczuk/go-chart/drawing"
// ValueProvider is a type that produces values.
type ValueProvider interface {
Len() int
@ -33,3 +35,9 @@ type FullBoundedValueProvider interface {
BoundedValueProvider
BoundedLastValueProvider
}
// SizeProvider is a provider for integer size.
type SizeProvider func(rx, ry, x, y float64) float64
// ColorProvider is a provider for dot size.
type ColorProvider func(rx, ry, x, y float64) drawing.Color

272
vidris.go Normal file
View File

@ -0,0 +1,272 @@
package chart
import "github.com/wcharczuk/go-chart/drawing"
func colorFromValues(r, g, b float64) drawing.Color {
return drawing.Color{R: uint8(r * 256), G: uint8(g * 256), B: uint8(b * 256), A: 255}
}
var vidrisColors = [256]drawing.Color{
colorFromValues(0.26700401, 0.00487433, 0.32941519),
colorFromValues(0.26851048, 0.00960483, 0.33542652),
colorFromValues(0.26994384, 0.01462494, 0.34137895),
colorFromValues(0.27130489, 0.01994186, 0.34726862),
colorFromValues(0.27259384, 0.02556309, 0.35309303),
colorFromValues(0.27380934, 0.03149748, 0.35885256),
colorFromValues(0.27495242, 0.03775181, 0.36454323),
colorFromValues(0.27602238, 0.04416723, 0.37016418),
colorFromValues(0.2770184, 0.05034437, 0.37571452),
colorFromValues(0.27794143, 0.05632444, 0.38119074),
colorFromValues(0.27879067, 0.06214536, 0.38659204),
colorFromValues(0.2795655, 0.06783587, 0.39191723),
colorFromValues(0.28026658, 0.07341724, 0.39716349),
colorFromValues(0.28089358, 0.07890703, 0.40232944),
colorFromValues(0.28144581, 0.0843197, 0.40741404),
colorFromValues(0.28192358, 0.08966622, 0.41241521),
colorFromValues(0.28232739, 0.09495545, 0.41733086),
colorFromValues(0.28265633, 0.10019576, 0.42216032),
colorFromValues(0.28291049, 0.10539345, 0.42690202),
colorFromValues(0.28309095, 0.11055307, 0.43155375),
colorFromValues(0.28319704, 0.11567966, 0.43611482),
colorFromValues(0.28322882, 0.12077701, 0.44058404),
colorFromValues(0.28318684, 0.12584799, 0.44496),
colorFromValues(0.283072, 0.13089477, 0.44924127),
colorFromValues(0.28288389, 0.13592005, 0.45342734),
colorFromValues(0.28262297, 0.14092556, 0.45751726),
colorFromValues(0.28229037, 0.14591233, 0.46150995),
colorFromValues(0.28188676, 0.15088147, 0.46540474),
colorFromValues(0.28141228, 0.15583425, 0.46920128),
colorFromValues(0.28086773, 0.16077132, 0.47289909),
colorFromValues(0.28025468, 0.16569272, 0.47649762),
colorFromValues(0.27957399, 0.17059884, 0.47999675),
colorFromValues(0.27882618, 0.1754902, 0.48339654),
colorFromValues(0.27801236, 0.18036684, 0.48669702),
colorFromValues(0.27713437, 0.18522836, 0.48989831),
colorFromValues(0.27619376, 0.19007447, 0.49300074),
colorFromValues(0.27519116, 0.1949054, 0.49600488),
colorFromValues(0.27412802, 0.19972086, 0.49891131),
colorFromValues(0.27300596, 0.20452049, 0.50172076),
colorFromValues(0.27182812, 0.20930306, 0.50443413),
colorFromValues(0.27059473, 0.21406899, 0.50705243),
colorFromValues(0.26930756, 0.21881782, 0.50957678),
colorFromValues(0.26796846, 0.22354911, 0.5120084),
colorFromValues(0.26657984, 0.2282621, 0.5143487),
colorFromValues(0.2651445, 0.23295593, 0.5165993),
colorFromValues(0.2636632, 0.23763078, 0.51876163),
colorFromValues(0.26213801, 0.24228619, 0.52083736),
colorFromValues(0.26057103, 0.2469217, 0.52282822),
colorFromValues(0.25896451, 0.25153685, 0.52473609),
colorFromValues(0.25732244, 0.2561304, 0.52656332),
colorFromValues(0.25564519, 0.26070284, 0.52831152),
colorFromValues(0.25393498, 0.26525384, 0.52998273),
colorFromValues(0.25219404, 0.26978306, 0.53157905),
colorFromValues(0.25042462, 0.27429024, 0.53310261),
colorFromValues(0.24862899, 0.27877509, 0.53455561),
colorFromValues(0.2468114, 0.28323662, 0.53594093),
colorFromValues(0.24497208, 0.28767547, 0.53726018),
colorFromValues(0.24311324, 0.29209154, 0.53851561),
colorFromValues(0.24123708, 0.29648471, 0.53970946),
colorFromValues(0.23934575, 0.30085494, 0.54084398),
colorFromValues(0.23744138, 0.30520222, 0.5419214),
colorFromValues(0.23552606, 0.30952657, 0.54294396),
colorFromValues(0.23360277, 0.31382773, 0.54391424),
colorFromValues(0.2316735, 0.3181058, 0.54483444),
colorFromValues(0.22973926, 0.32236127, 0.54570633),
colorFromValues(0.22780192, 0.32659432, 0.546532),
colorFromValues(0.2258633, 0.33080515, 0.54731353),
colorFromValues(0.22392515, 0.334994, 0.54805291),
colorFromValues(0.22198915, 0.33916114, 0.54875211),
colorFromValues(0.22005691, 0.34330688, 0.54941304),
colorFromValues(0.21812995, 0.34743154, 0.55003755),
colorFromValues(0.21620971, 0.35153548, 0.55062743),
colorFromValues(0.21429757, 0.35561907, 0.5511844),
colorFromValues(0.21239477, 0.35968273, 0.55171011),
colorFromValues(0.2105031, 0.36372671, 0.55220646),
colorFromValues(0.20862342, 0.36775151, 0.55267486),
colorFromValues(0.20675628, 0.37175775, 0.55311653),
colorFromValues(0.20490257, 0.37574589, 0.55353282),
colorFromValues(0.20306309, 0.37971644, 0.55392505),
colorFromValues(0.20123854, 0.38366989, 0.55429441),
colorFromValues(0.1994295, 0.38760678, 0.55464205),
colorFromValues(0.1976365, 0.39152762, 0.55496905),
colorFromValues(0.19585993, 0.39543297, 0.55527637),
colorFromValues(0.19410009, 0.39932336, 0.55556494),
colorFromValues(0.19235719, 0.40319934, 0.55583559),
colorFromValues(0.19063135, 0.40706148, 0.55608907),
colorFromValues(0.18892259, 0.41091033, 0.55632606),
colorFromValues(0.18723083, 0.41474645, 0.55654717),
colorFromValues(0.18555593, 0.4185704, 0.55675292),
colorFromValues(0.18389763, 0.42238275, 0.55694377),
colorFromValues(0.18225561, 0.42618405, 0.5571201),
colorFromValues(0.18062949, 0.42997486, 0.55728221),
colorFromValues(0.17901879, 0.43375572, 0.55743035),
colorFromValues(0.17742298, 0.4375272, 0.55756466),
colorFromValues(0.17584148, 0.44128981, 0.55768526),
colorFromValues(0.17427363, 0.4450441, 0.55779216),
colorFromValues(0.17271876, 0.4487906, 0.55788532),
colorFromValues(0.17117615, 0.4525298, 0.55796464),
colorFromValues(0.16964573, 0.45626209, 0.55803034),
colorFromValues(0.16812641, 0.45998802, 0.55808199),
colorFromValues(0.1666171, 0.46370813, 0.55811913),
colorFromValues(0.16511703, 0.4674229, 0.55814141),
colorFromValues(0.16362543, 0.47113278, 0.55814842),
colorFromValues(0.16214155, 0.47483821, 0.55813967),
colorFromValues(0.16066467, 0.47853961, 0.55811466),
colorFromValues(0.15919413, 0.4822374, 0.5580728),
colorFromValues(0.15772933, 0.48593197, 0.55801347),
colorFromValues(0.15626973, 0.4896237, 0.557936),
colorFromValues(0.15481488, 0.49331293, 0.55783967),
colorFromValues(0.15336445, 0.49700003, 0.55772371),
colorFromValues(0.1519182, 0.50068529, 0.55758733),
colorFromValues(0.15047605, 0.50436904, 0.55742968),
colorFromValues(0.14903918, 0.50805136, 0.5572505),
colorFromValues(0.14760731, 0.51173263, 0.55704861),
colorFromValues(0.14618026, 0.51541316, 0.55682271),
colorFromValues(0.14475863, 0.51909319, 0.55657181),
colorFromValues(0.14334327, 0.52277292, 0.55629491),
colorFromValues(0.14193527, 0.52645254, 0.55599097),
colorFromValues(0.14053599, 0.53013219, 0.55565893),
colorFromValues(0.13914708, 0.53381201, 0.55529773),
colorFromValues(0.13777048, 0.53749213, 0.55490625),
colorFromValues(0.1364085, 0.54117264, 0.55448339),
colorFromValues(0.13506561, 0.54485335, 0.55402906),
colorFromValues(0.13374299, 0.54853458, 0.55354108),
colorFromValues(0.13244401, 0.55221637, 0.55301828),
colorFromValues(0.13117249, 0.55589872, 0.55245948),
colorFromValues(0.1299327, 0.55958162, 0.55186354),
colorFromValues(0.12872938, 0.56326503, 0.55122927),
colorFromValues(0.12756771, 0.56694891, 0.55055551),
colorFromValues(0.12645338, 0.57063316, 0.5498411),
colorFromValues(0.12539383, 0.57431754, 0.54908564),
colorFromValues(0.12439474, 0.57800205, 0.5482874),
colorFromValues(0.12346281, 0.58168661, 0.54744498),
colorFromValues(0.12260562, 0.58537105, 0.54655722),
colorFromValues(0.12183122, 0.58905521, 0.54562298),
colorFromValues(0.12114807, 0.59273889, 0.54464114),
colorFromValues(0.12056501, 0.59642187, 0.54361058),
colorFromValues(0.12009154, 0.60010387, 0.54253043),
colorFromValues(0.11973756, 0.60378459, 0.54139999),
colorFromValues(0.11951163, 0.60746388, 0.54021751),
colorFromValues(0.11942341, 0.61114146, 0.53898192),
colorFromValues(0.11948255, 0.61481702, 0.53769219),
colorFromValues(0.11969858, 0.61849025, 0.53634733),
colorFromValues(0.12008079, 0.62216081, 0.53494633),
colorFromValues(0.12063824, 0.62582833, 0.53348834),
colorFromValues(0.12137972, 0.62949242, 0.53197275),
colorFromValues(0.12231244, 0.63315277, 0.53039808),
colorFromValues(0.12344358, 0.63680899, 0.52876343),
colorFromValues(0.12477953, 0.64046069, 0.52706792),
colorFromValues(0.12632581, 0.64410744, 0.52531069),
colorFromValues(0.12808703, 0.64774881, 0.52349092),
colorFromValues(0.13006688, 0.65138436, 0.52160791),
colorFromValues(0.13226797, 0.65501363, 0.51966086),
colorFromValues(0.13469183, 0.65863619, 0.5176488),
colorFromValues(0.13733921, 0.66225157, 0.51557101),
colorFromValues(0.14020991, 0.66585927, 0.5134268),
colorFromValues(0.14330291, 0.66945881, 0.51121549),
colorFromValues(0.1466164, 0.67304968, 0.50893644),
colorFromValues(0.15014782, 0.67663139, 0.5065889),
colorFromValues(0.15389405, 0.68020343, 0.50417217),
colorFromValues(0.15785146, 0.68376525, 0.50168574),
colorFromValues(0.16201598, 0.68731632, 0.49912906),
colorFromValues(0.1663832, 0.69085611, 0.49650163),
colorFromValues(0.1709484, 0.69438405, 0.49380294),
colorFromValues(0.17570671, 0.6978996, 0.49103252),
colorFromValues(0.18065314, 0.70140222, 0.48818938),
colorFromValues(0.18578266, 0.70489133, 0.48527326),
colorFromValues(0.19109018, 0.70836635, 0.48228395),
colorFromValues(0.19657063, 0.71182668, 0.47922108),
colorFromValues(0.20221902, 0.71527175, 0.47608431),
colorFromValues(0.20803045, 0.71870095, 0.4728733),
colorFromValues(0.21400015, 0.72211371, 0.46958774),
colorFromValues(0.22012381, 0.72550945, 0.46622638),
colorFromValues(0.2263969, 0.72888753, 0.46278934),
colorFromValues(0.23281498, 0.73224735, 0.45927675),
colorFromValues(0.2393739, 0.73558828, 0.45568838),
colorFromValues(0.24606968, 0.73890972, 0.45202405),
colorFromValues(0.25289851, 0.74221104, 0.44828355),
colorFromValues(0.25985676, 0.74549162, 0.44446673),
colorFromValues(0.26694127, 0.74875084, 0.44057284),
colorFromValues(0.27414922, 0.75198807, 0.4366009),
colorFromValues(0.28147681, 0.75520266, 0.43255207),
colorFromValues(0.28892102, 0.75839399, 0.42842626),
colorFromValues(0.29647899, 0.76156142, 0.42422341),
colorFromValues(0.30414796, 0.76470433, 0.41994346),
colorFromValues(0.31192534, 0.76782207, 0.41558638),
colorFromValues(0.3198086, 0.77091403, 0.41115215),
colorFromValues(0.3277958, 0.77397953, 0.40664011),
colorFromValues(0.33588539, 0.7770179, 0.40204917),
colorFromValues(0.34407411, 0.78002855, 0.39738103),
colorFromValues(0.35235985, 0.78301086, 0.39263579),
colorFromValues(0.36074053, 0.78596419, 0.38781353),
colorFromValues(0.3692142, 0.78888793, 0.38291438),
colorFromValues(0.37777892, 0.79178146, 0.3779385),
colorFromValues(0.38643282, 0.79464415, 0.37288606),
colorFromValues(0.39517408, 0.79747541, 0.36775726),
colorFromValues(0.40400101, 0.80027461, 0.36255223),
colorFromValues(0.4129135, 0.80304099, 0.35726893),
colorFromValues(0.42190813, 0.80577412, 0.35191009),
colorFromValues(0.43098317, 0.80847343, 0.34647607),
colorFromValues(0.44013691, 0.81113836, 0.3409673),
colorFromValues(0.44936763, 0.81376835, 0.33538426),
colorFromValues(0.45867362, 0.81636288, 0.32972749),
colorFromValues(0.46805314, 0.81892143, 0.32399761),
colorFromValues(0.47750446, 0.82144351, 0.31819529),
colorFromValues(0.4870258, 0.82392862, 0.31232133),
colorFromValues(0.49661536, 0.82637633, 0.30637661),
colorFromValues(0.5062713, 0.82878621, 0.30036211),
colorFromValues(0.51599182, 0.83115784, 0.29427888),
colorFromValues(0.52577622, 0.83349064, 0.2881265),
colorFromValues(0.5356211, 0.83578452, 0.28190832),
colorFromValues(0.5455244, 0.83803918, 0.27562602),
colorFromValues(0.55548397, 0.84025437, 0.26928147),
colorFromValues(0.5654976, 0.8424299, 0.26287683),
colorFromValues(0.57556297, 0.84456561, 0.25641457),
colorFromValues(0.58567772, 0.84666139, 0.24989748),
colorFromValues(0.59583934, 0.84871722, 0.24332878),
colorFromValues(0.60604528, 0.8507331, 0.23671214),
colorFromValues(0.61629283, 0.85270912, 0.23005179),
colorFromValues(0.62657923, 0.85464543, 0.22335258),
colorFromValues(0.63690157, 0.85654226, 0.21662012),
colorFromValues(0.64725685, 0.85839991, 0.20986086),
colorFromValues(0.65764197, 0.86021878, 0.20308229),
colorFromValues(0.66805369, 0.86199932, 0.19629307),
colorFromValues(0.67848868, 0.86374211, 0.18950326),
colorFromValues(0.68894351, 0.86544779, 0.18272455),
colorFromValues(0.69941463, 0.86711711, 0.17597055),
colorFromValues(0.70989842, 0.86875092, 0.16925712),
colorFromValues(0.72039115, 0.87035015, 0.16260273),
colorFromValues(0.73088902, 0.87191584, 0.15602894),
colorFromValues(0.74138803, 0.87344918, 0.14956101),
colorFromValues(0.75188414, 0.87495143, 0.14322828),
colorFromValues(0.76237342, 0.87642392, 0.13706449),
colorFromValues(0.77285183, 0.87786808, 0.13110864),
colorFromValues(0.78331535, 0.87928545, 0.12540538),
colorFromValues(0.79375994, 0.88067763, 0.12000532),
colorFromValues(0.80418159, 0.88204632, 0.11496505),
colorFromValues(0.81457634, 0.88339329, 0.11034678),
colorFromValues(0.82494028, 0.88472036, 0.10621724),
colorFromValues(0.83526959, 0.88602943, 0.1026459),
colorFromValues(0.84556056, 0.88732243, 0.09970219),
colorFromValues(0.8558096, 0.88860134, 0.09745186),
colorFromValues(0.86601325, 0.88986815, 0.09595277),
colorFromValues(0.87616824, 0.89112487, 0.09525046),
colorFromValues(0.88627146, 0.89237353, 0.09537439),
colorFromValues(0.89632002, 0.89361614, 0.09633538),
colorFromValues(0.90631121, 0.89485467, 0.09812496),
colorFromValues(0.91624212, 0.89609127, 0.1007168),
colorFromValues(0.92610579, 0.89732977, 0.10407067),
colorFromValues(0.93590444, 0.8985704, 0.10813094),
colorFromValues(0.94563626, 0.899815, 0.11283773),
colorFromValues(0.95529972, 0.90106534, 0.11812832),
colorFromValues(0.96489353, 0.90232311, 0.12394051),
colorFromValues(0.97441665, 0.90358991, 0.13021494),
colorFromValues(0.98386829, 0.90486726, 0.13689671),
colorFromValues(0.99324789, 0.90615657, 0.1439362),
}
// Vidris creates a vidris color map provider.
func Vidris(rx, ry, x, y float64) drawing.Color {
index := uint8((y / ry) * 256)
return vidrisColors[index]
}