83 lines
3.1 KiB
Go
83 lines
3.1 KiB
Go
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package drawing
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import (
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"image"
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"image/color"
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"github.com/golang/freetype/truetype"
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)
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// GraphicContext describes the interface for the various backends (images, pdf, opengl, ...)
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type GraphicContext interface {
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// PathBuilder describes the interface for path drawing
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PathBuilder
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// BeginPath creates a new path
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BeginPath()
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// GetMatrixTransform returns the current transformation matrix
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GetMatrixTransform() Matrix
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// SetMatrixTransform sets the current transformation matrix
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SetMatrixTransform(tr Matrix)
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// ComposeMatrixTransform composes the current transformation matrix with tr
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ComposeMatrixTransform(tr Matrix)
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// Rotate applies a rotation to the current transformation matrix. angle is in radian.
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Rotate(angle float64)
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// Translate applies a translation to the current transformation matrix.
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Translate(tx, ty float64)
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// Scale applies a scale to the current transformation matrix.
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Scale(sx, sy float64)
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// SetStrokeColor sets the current stroke color
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SetStrokeColor(c color.Color)
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// SetFillColor sets the current fill color
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SetFillColor(c color.Color)
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// SetFillRule sets the current fill rule
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SetFillRule(f FillRule)
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// SetLineWidth sets the current line width
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SetLineWidth(lineWidth float64)
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// SetLineCap sets the current line cap
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SetLineCap(cap LineCap)
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// SetLineJoin sets the current line join
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SetLineJoin(join LineJoin)
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// SetLineDash sets the current dash
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SetLineDash(dash []float64, dashOffset float64)
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// SetFontSize sets the current font size
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SetFontSize(fontSize float64)
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// GetFontSize gets the current font size
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GetFontSize() float64
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// SetFont sets the font for the context
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SetFont(f *truetype.Font)
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// GetFont returns the current font
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GetFont() *truetype.Font
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// DrawImage draws the raster image in the current canvas
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DrawImage(image image.Image)
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// Save the context and push it to the context stack
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Save()
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// Restore remove the current context and restore the last one
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Restore()
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// Clear fills the current canvas with a default transparent color
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Clear()
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// ClearRect fills the specified rectangle with a default transparent color
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ClearRect(x1, y1, x2, y2 int)
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// SetDPI sets the current DPI
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SetDPI(dpi int)
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// GetDPI gets the current DPI
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GetDPI() int
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// GetStringBounds gets pixel bounds(dimensions) of given string
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GetStringBounds(s string) (left, top, right, bottom float64)
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// CreateStringPath creates a path from the string s at x, y
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CreateStringPath(text string, x, y float64) (cursor float64)
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// FillString draws the text at point (0, 0)
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FillString(text string) (cursor float64)
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// FillStringAt draws the text at the specified point (x, y)
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FillStringAt(text string, x, y float64) (cursor float64)
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// StrokeString draws the contour of the text at point (0, 0)
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StrokeString(text string) (cursor float64)
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// StrokeStringAt draws the contour of the text at point (x, y)
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StrokeStringAt(text string, x, y float64) (cursor float64)
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// Stroke strokes the paths with the color specified by SetStrokeColor
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Stroke(paths ...*Path)
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// Fill fills the paths with the color specified by SetFillColor
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Fill(paths ...*Path)
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// FillStroke first fills the paths and than strokes them
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FillStroke(paths ...*Path)
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}
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