nsIDOMCanvasRenderingContext2D

IID:15487cf4-292b-49aa-bc36-17d9099f77a7
Inherits From:nsISupports

Properties

readonly nsIDOMHTMLCanvasElement canvas

nsIVariant fillStyle

float globalAlpha

DOMString globalCompositeOperation

DOMString lineCap

DOMString lineJoin

float lineWidth

float miterLimit

float shadowBlur

DOMString shadowColor

float shadowOffsetX

float shadowOffsetY

nsIVariant strokeStyle


Methods

void arc ( float x , float y , float r , float startAngle , float endAngle , PRBool clockwise ) void arcTo ( float x1 , float y1 , float x2 , float y2 , float radius ) void beginPath ( ) void bezierCurveTo ( float cp1x , float cp1y , float cp2x , float cp2y , float x , float y ) void clearRect ( float x , float y , float w , float h ) void clip ( ) void closePath ( ) nsIDOMCanvasGradient createLinearGradient ( float x0 , float y0 , float x1 , float y1 ) nsIDOMCanvasPattern createPattern ( nsIDOMHTMLImageElement image , DOMString repetition ) nsIDOMCanvasGradient createRadialGradient ( float x0 , float y0 , float r0 , float x1 , float y1 , float r1 ) void drawImage ( ) void drawWindow ( nsIDOMWindow window , PRInt32 x , PRInt32 y , PRInt32 w , PRInt32 h , DOMString bgColor ) void fill ( ) void fillRect ( float x , float y , float w , float h ) void lineTo ( float x , float y ) void moveTo ( float x , float y ) void quadraticCurveTo ( float cpx , float cpy , float x , float y ) void rect ( float x , float y , float w , float h ) void restore ( ) void rotate ( float angle ) void save ( ) void scale ( float x , float y ) void stroke ( ) void strokeRect ( float x , float y , float w , float h ) void translate ( float x , float y )

void arc ( float x , float y , float r , float startAngle , float endAngle , PRBool clockwise )

Arguments:
x
y
r
startAngle
endAngle
clockwise

void arcTo ( float x1 , float y1 , float x2 , float y2 , float radius )

Arguments:
x1
y1
x2
y2
radius

void beginPath ( )


void bezierCurveTo ( float cp1x , float cp1y , float cp2x , float cp2y , float x , float y )

Arguments:
cp1x
cp1y
cp2x
cp2y
x
y

void clearRect ( float x , float y , float w , float h )

Arguments:
x
y
w
h

void clip ( )


void closePath ( )


nsIDOMCanvasGradient createLinearGradient ( float x0 , float y0 , float x1 , float y1 )

Arguments:
x0
y0
x1
y1

nsIDOMCanvasPattern createPattern ( nsIDOMHTMLImageElement image , DOMString repetition )

Arguments:
image
repetition

nsIDOMCanvasGradient createRadialGradient ( float x0 , float y0 , float r0 , float x1 , float y1 , float r1 )

Arguments:
x0
y0
r0
x1
y1
r1

void drawImage ( )


void drawWindow ( nsIDOMWindow window , PRInt32 x , PRInt32 y , PRInt32 w , PRInt32 h , DOMString bgColor )

Renders a region of a window into the canvas. The contents of the window's viewport are rendered, ignoring viewport clipping and scrolling.

Of course, the rendering obeys the current scale, transform and globalAlpha values.

Hints: -- If 'rgba(0,0,0,0)' is used for the background color, the drawing will be transparent wherever the window is transparent. -- Top-level browsed documents are usually not transparent because the user's background-color preference is applied, but IFRAMEs are transparent if the page doesn't set a background. -- If an opaque color is used for the background color, rendering will be faster because we won't have to compute the window's transparency.

This API cannot currently be used by Web content. It is chrome only.

Arguments:
window
x
y
w
h: specify the area of the window to render, in CSS pixels.
bgColor

void fill ( )


void fillRect ( float x , float y , float w , float h )

Arguments:
x
y
w
h

void lineTo ( float x , float y )

Arguments:
x
y

void moveTo ( float x , float y )

Arguments:
x
y

void quadraticCurveTo ( float cpx , float cpy , float x , float y )

Arguments:
cpx
cpy
x
y

void rect ( float x , float y , float w , float h )

Arguments:
x
y
w
h

void restore ( )


void rotate ( float angle )

Arguments:
angle

void save ( )


void scale ( float x , float y )

Arguments:
x
y

void stroke ( )


void strokeRect ( float x , float y , float w , float h )

Arguments:
x
y
w
h

void translate ( float x , float y )

Arguments:
x
y

Reference documentation is generated from Mozilla's source.

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