66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package chart
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import (
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"image/color"
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"io"
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"github.com/golang/freetype/truetype"
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)
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// RendererProvider is a function that returns a renderer.
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type RendererProvider func(int, int) (Renderer, error)
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// Renderer represents the basic methods required to draw a chart.
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type Renderer interface {
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// SetDPI sets the DPI for the renderer.
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SetDPI(dpi float64)
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// SetStrokeColor sets the current stroke color.
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SetStrokeColor(color.RGBA)
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// SetFillColor sets the current fill color.
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SetFillColor(color.RGBA)
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// SetStrokeWidth sets the stroke width.
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SetStrokeWidth(width float64)
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// MoveTo moves the cursor to a given point.
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MoveTo(x, y int)
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// LineTo both starts a shape and draws a line to a given point
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// from the previous point.
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LineTo(x, y int)
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// Close finalizes a shape as drawn by LineTo.
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Close()
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// Stroke strokes the path.
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Stroke()
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// Fill fills the path, but does not stroke.
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Fill()
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// FillStroke fills and strokes a path.
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FillStroke()
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// Circle draws a circle at the given coords with a given radius.
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Circle(radius float64, x, y int)
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// SetFont sets a font for a text field.
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SetFont(*truetype.Font)
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// SetFontColor sets a font's color
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SetFontColor(color.RGBA)
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// SetFontSize sets the font size for a text field.
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SetFontSize(size float64)
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// Text draws a text blob.
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Text(body string, x, y int)
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// MeasureText measures text.
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MeasureText(body string) (width int, height int)
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// Save writes the image to the given writer.
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Save(w io.Writer) error
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}
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