go-chart/renderer.go

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package chart
import (
"io"
"github.com/golang/freetype/truetype"
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"github.com/wcharczuk/go-chart/drawing"
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)
// Renderer represents the basic methods required to draw a chart.
type Renderer interface {
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// ResetStyle should reset any style related settings on the renderer.
ResetStyle()
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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.
SetDPI(dpi float64)
// SetClassName sets the current class name.
SetClassName(string)
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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.
SetStrokeWidth(width float64)
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// SetStrokeDashArray sets the stroke dash array.
SetStrokeDashArray(dashArray []float64)
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// MoveTo moves the cursor to a given point.
MoveTo(x, y int)
// LineTo both starts a shape and draws a line to a given point
// from the previous point.
LineTo(x, y int)
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// QuadCurveTo draws a quad curve.
// cx and cy represent the bezier "control points".
QuadCurveTo(cx, cy, x, y int)
// ArcTo draws an arc with a given center (cx,cy)
// a given set of radii (rx,ry), a startAngle and delta (in radians).
ArcTo(cx, cy int, rx, ry, startAngle, delta float64)
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// Close finalizes a shape as drawn by LineTo.
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.
Fill()
// FillStroke fills and strokes a path.
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FillStroke()
// Circle draws a circle at the given coords with a given radius.
Circle(radius float64, x, y int)
// SetFont sets a font for a text field.
SetFont(*truetype.Font)
// 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.
SetFontSize(size float64)
// Text draws a text blob.
Text(body string, x, y int)
// MeasureText measures text.
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MeasureText(body string) Box
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// SetTextRotatation sets a rotation for drawing elements.
SetTextRotation(radians float64)
// ClearTextRotation clears rotation.
ClearTextRotation()
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// Save writes the image to the given writer.
Save(w io.Writer) error
}