83 lines
2 KiB
Go
83 lines
2 KiB
Go
package chart
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import (
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"io"
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"github.com/golang/freetype/truetype"
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"github.com/wcharczuk/go-chart/drawing"
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)
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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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// GetDPI gets the DPI for the renderer.
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GetDPI() float64
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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(drawing.Color)
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// SetFillColor sets the current fill color.
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SetFillColor(drawing.Color)
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// SetStrokeWidth sets the stroke width.
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SetStrokeWidth(width float64)
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// SetStrokeDashArray sets the stroke dash array.
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SetStrokeDashArray(dashArray []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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// QuadCurveTo draws a quad curve.
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// cx and cy represent the bezier "control points".
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QuadCurveTo(cx, cy, x, y int)
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// ArcTo draws an arc with a given center (cx,cy)
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// a given set of radii (rx,ry), a startAngle and delta (in radians).
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ArcTo(cx, cy int, rx, ry, startAngle, delta float64)
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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(drawing.Color)
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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) Box
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// SetTextRotatation sets a rotation for drawing elements.
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SetTextRotation(radians float64)
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// ClearTextRotation clears rotation.
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ClearTextRotation()
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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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