forked from llgcode/draw2d
/
gc.go
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/
gc.go
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// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 21/11/2010 by Laurent Le Goff
package draw2d
import (
"image"
"image/color"
)
// GraphicContext describes the interface for the various backends (images, pdf, opengl, ...)
type GraphicContext interface {
// PathBuilder describes the interface for path drawing
PathBuilder
// BeginPath creates a new path
BeginPath()
// GetPath copies the current path, then returns it
GetPath() Path
// GetMatrixTransform returns the current transformation matrix
GetMatrixTransform() Matrix
// SetMatrixTransform sets the current transformation matrix
SetMatrixTransform(tr Matrix)
// ComposeMatrixTransform composes the current transformation matrix with tr
ComposeMatrixTransform(tr Matrix)
// Rotate applies a rotation to the current transformation matrix. angle is in radian.
Rotate(angle float64)
// Translate applies a translation to the current transformation matrix.
Translate(tx, ty float64)
// Scale applies a scale to the current transformation matrix.
Scale(sx, sy float64)
// SetStrokeColor sets the current stroke color
SetStrokeColor(c color.Color)
// SetFillColor sets the current fill color
SetFillColor(c color.Color)
// SetFillRule sets the current fill rule
SetFillRule(f FillRule)
// SetLineWidth sets the current line width
SetLineWidth(lineWidth float64)
// SetLineCap sets the current line cap
SetLineCap(cap LineCap)
// SetLineJoin sets the current line join
SetLineJoin(join LineJoin)
// SetLineDash sets the current dash
SetLineDash(dash []float64, dashOffset float64)
// SetFontSize sets the current font size
SetFontSize(fontSize float64)
// GetFontSize gets the current font size
GetFontSize() float64
// SetFontData sets the current FontData
SetFontData(fontData FontData)
// GetFontData gets the current FontData
GetFontData() FontData
// GetFontName gets the current FontData as a string
GetFontName() string
// DrawImage draws the raster image in the current canvas
DrawImage(image image.Image)
// Save the context and push it to the context stack
Save()
// Restore remove the current context and restore the last one
Restore()
// Clear fills the current canvas with a default transparent color
Clear()
// ClearRect fills the specified rectangle with a default transparent color
ClearRect(x1, y1, x2, y2 int)
// SetDPI sets the current DPI
SetDPI(dpi int)
// GetDPI gets the current DPI
GetDPI() int
// GetStringBounds gets pixel bounds(dimensions) of given string
GetStringBounds(s string) (left, top, right, bottom float64)
// CreateStringPath creates a path from the string s at x, y
CreateStringPath(text string, x, y float64) (cursor float64)
// FillString draws the text at point (0, 0)
FillString(text string) (cursor float64)
// FillStringAt draws the text at the specified point (x, y)
FillStringAt(text string, x, y float64) (cursor float64)
// StrokeString draws the contour of the text at point (0, 0)
StrokeString(text string) (cursor float64)
// StrokeStringAt draws the contour of the text at point (x, y)
StrokeStringAt(text string, x, y float64) (cursor float64)
// Stroke strokes the paths with the color specified by SetStrokeColor
Stroke(paths ...*Path)
// Fill fills the paths with the color specified by SetFillColor
Fill(paths ...*Path)
// FillStroke first fills the paths and than strokes them
FillStroke(paths ...*Path)
}