b713ff85cc
* works more or less * updating comment * removing debugging printf * adding output * tweaks * missed a couple series validations * testing auto coloring * updated output.png * color tests etc. * sanity check tests. * should not use unkeyed fields anyway.
232 lines
8.3 KiB
Go
232 lines
8.3 KiB
Go
package chart
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/golang/freetype/truetype"
|
|
"github.com/wcharczuk/go-chart/drawing"
|
|
)
|
|
|
|
const (
|
|
// DefaultChartHeight is the default chart height.
|
|
DefaultChartHeight = 400
|
|
// DefaultChartWidth is the default chart width.
|
|
DefaultChartWidth = 1024
|
|
// DefaultStrokeWidth is the default chart stroke width.
|
|
DefaultStrokeWidth = 0.0
|
|
// DefaultDotWidth is the default chart dot width.
|
|
DefaultDotWidth = 0.0
|
|
// DefaultSeriesLineWidth is the default line width.
|
|
DefaultSeriesLineWidth = 1.0
|
|
// DefaultAxisLineWidth is the line width of the axis lines.
|
|
DefaultAxisLineWidth = 1.0
|
|
//DefaultDPI is the default dots per inch for the chart.
|
|
DefaultDPI = 92.0
|
|
// DefaultMinimumFontSize is the default minimum font size.
|
|
DefaultMinimumFontSize = 8.0
|
|
// DefaultFontSize is the default font size.
|
|
DefaultFontSize = 10.0
|
|
// DefaultTitleFontSize is the default title font size.
|
|
DefaultTitleFontSize = 18.0
|
|
// DefaultAnnotationDeltaWidth is the width of the left triangle out of annotations.
|
|
DefaultAnnotationDeltaWidth = 10
|
|
// DefaultAnnotationFontSize is the font size of annotations.
|
|
DefaultAnnotationFontSize = 10.0
|
|
// DefaultAxisFontSize is the font size of the axis labels.
|
|
DefaultAxisFontSize = 10.0
|
|
// DefaultTitleTop is the default distance from the top of the chart to put the title.
|
|
DefaultTitleTop = 10
|
|
|
|
// DefaultBackgroundStrokeWidth is the default stroke on the chart background.
|
|
DefaultBackgroundStrokeWidth = 0.0
|
|
// DefaultCanvasStrokeWidth is the default stroke on the chart canvas.
|
|
DefaultCanvasStrokeWidth = 0.0
|
|
|
|
// DefaultLineSpacing is the default vertical distance between lines of text.
|
|
DefaultLineSpacing = 5
|
|
|
|
// DefaultYAxisMargin is the default distance from the right of the canvas to the y axis labels.
|
|
DefaultYAxisMargin = 10
|
|
// DefaultXAxisMargin is the default distance from bottom of the canvas to the x axis labels.
|
|
DefaultXAxisMargin = 10
|
|
|
|
//DefaultVerticalTickHeight is half the margin.
|
|
DefaultVerticalTickHeight = DefaultXAxisMargin >> 1
|
|
//DefaultHorizontalTickWidth is half the margin.
|
|
DefaultHorizontalTickWidth = DefaultYAxisMargin >> 1
|
|
|
|
// DefaultTickCount is the default number of ticks to show
|
|
DefaultTickCount = 10
|
|
// DefaultTickCountSanityCheck is a hard limit on number of ticks to prevent infinite loops.
|
|
DefaultTickCountSanityCheck = 1 << 10 //1024
|
|
|
|
// DefaultMinimumTickHorizontalSpacing is the minimum distance between horizontal ticks.
|
|
DefaultMinimumTickHorizontalSpacing = 20
|
|
// DefaultMinimumTickVerticalSpacing is the minimum distance between vertical ticks.
|
|
DefaultMinimumTickVerticalSpacing = 20
|
|
|
|
// DefaultDateFormat is the default date format.
|
|
DefaultDateFormat = "2006-01-02"
|
|
// DefaultDateHourFormat is the date format for hour timestamp formats.
|
|
DefaultDateHourFormat = "01-02 3PM"
|
|
// DefaultDateMinuteFormat is the date format for minute range timestamp formats.
|
|
DefaultDateMinuteFormat = "01-02 3:04PM"
|
|
// DefaultFloatFormat is the default float format.
|
|
DefaultFloatFormat = "%.2f"
|
|
// DefaultPercentValueFormat is the default percent format.
|
|
DefaultPercentValueFormat = "%0.2f%%"
|
|
|
|
// DefaultBarSpacing is the default pixel spacing between bars.
|
|
DefaultBarSpacing = 100
|
|
// DefaultBarWidth is the default pixel width of bars in a bar chart.
|
|
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}
|
|
// DashArrayDashesSmall is a dash array that represents '- - -' style stroke dashes.
|
|
DashArrayDashesSmall = []int{3, 3}
|
|
// DashArrayDashesMedium is a dash array that represents '-- -- --' style stroke dashes.
|
|
DashArrayDashesMedium = []int{5, 5}
|
|
// DashArrayDashesLarge is a dash array that represents '----- ----- -----' style stroke dashes.
|
|
DashArrayDashesLarge = []int{10, 10}
|
|
)
|
|
|
|
// NewColor returns a new color.
|
|
func NewColor(r, g, b, a uint8) drawing.Color {
|
|
return drawing.Color{R: r, G: g, B: b, A: a}
|
|
}
|
|
|
|
// 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}
|
|
// DefaultBackgroundPadding is the default canvas padding config.
|
|
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
|
|
}
|