71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
package chart
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import (
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"image/color"
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"sync"
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"github.com/golang/freetype/truetype"
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)
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const (
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// DefaultChartHeight is the default chart height.
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DefaultChartHeight = 400
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// DefaultChartWidth is the default chart width.
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DefaultChartWidth = 200
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// DefaultPadding is the default gap between the image border and
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// chart content (referred to as the "canvas").
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DefaultPadding = 10
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// DefaultLineWidth is the default chart line width.
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DefaultLineWidth = 2.0
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// DefaultAxisLineWidth is the line width of the axis lines.
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DefaultAxisLineWidth = 1.0
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//DefaultDPI is the default dots per inch for the chart.
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DefaultDPI = 120.0
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// DefaultMinimumFontSize is the default minimum font size.
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DefaultMinimumFontSize = 8.0
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)
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var (
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// DefaultBackgroundColor is the default chart background color.
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// It is equivalent to css color:white.
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DefaultBackgroundColor = color.RGBA{R: 255, G: 255, B: 255, A: 255}
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// DefaultCanvasColor is the default chart canvas color.
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// It is equivalent to css color:white.
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DefaultCanvasColor = color.RGBA{R: 255, G: 255, B: 255, A: 255}
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// DefaultTextColor is the default chart text color.
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// It is equivalent to #333333.
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DefaultTextColor = color.RGBA{R: 51, G: 51, B: 51, A: 255}
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// DefaultAxisColor is the default chart axis line color.
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// It is equivalent to #333333.
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DefaultAxisColor = color.RGBA{R: 51, G: 51, B: 51, A: 255}
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// DefaultBorderColor is the default chart border color.
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// It is equivalent to #efefef.
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DefaultBorderColor = color.RGBA{R: 239, G: 239, B: 239, A: 255}
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// DefaultLineColor is the default (1st) series line color.
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// It is equivalent to #0074d9.
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DefaultLineColor = color.RGBA{R: 0, G: 217, B: 116, A: 255}
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// DefaultFillColor is the default fill color.
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// It is equivalent to #0074d9.
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DefaultFillColor = color.RGBA{R: 0, G: 217, B: 116, A: 255}
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)
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var (
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_defaultFontLock sync.Mutex
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_defaultFont *truetype.Font
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)
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// GetDefaultFont returns the default font (Roboto-Medium).
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func GetDefaultFont() (*truetype.Font, error) {
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if _defaultFont == nil {
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_defaultFontLock.Lock()
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defer _defaultFontLock.Unlock()
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if _defaultFont == nil {
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font, err := truetype.Parse(roboto)
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if err != nil {
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return nil, err
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}
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_defaultFont = font
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}
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}
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return _defaultFont, nil
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}
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