CanvasRenderingContext2D
The 2D rendering context for the drawing surface of a <canvas> element. To get this object, call getContext() on a <canvas>, supplying "2d" as the argument:
Value members
Concrete methods
The arc() method creates a circular arc centered at (x, y) with a radius of radius. The path starts at startAngle, ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
The arc() method creates a circular arc centered at (x, y) with a radius of radius. The path starts at startAngle, ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
The arc() method creates a circular arc centered at (x, y) with a radius of radius. The path starts at startAngle, ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
The arc() method creates a circular arc centered at (x, y) with a radius of radius. The path starts at startAngle, ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
Adds an arc with the given control points and radius, connected to the previous point by a straight line.
Adds an arc with the given control points and radius, connected to the previous point by a straight line.
Starts a new path by resetting the list of sub-paths. Call this method when you want to create a new path.
Starts a new path by resetting the list of sub-paths. Call this method when you want to create a new path.
Adds a cubic Bézier curve to the current path.
Adds a cubic Bézier curve to the current path.
Sets all pixels in the rectangle defined by starting point (x, y) and size (width, height) to transparent black.
Sets all pixels in the rectangle defined by starting point (x, y) and size (width, height) to transparent black.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
Tries to draw a straight line from the current point to the start. If the shape has already been closed or has only one point, this function does nothing.
Tries to draw a straight line from the current point to the start. If the shape has already been closed or has only one point, this function does nothing.
Creates a new, blank ImageData object with the specified dimensions. All of the pixels in the new object are transparent black.
Creates a new, blank ImageData object with the specified dimensions. All of the pixels in the new object are transparent black.
Creates a linear gradient along the line given by the coordinates represented by the parameters.
Creates a linear gradient along the line given by the coordinates represented by the parameters.
Creates a pattern using the specified image. It repeats the source in the directions specified by the repetition argument. This method returns a CanvasPattern.
Creates a pattern using the specified image. It repeats the source in the directions specified by the repetition argument. This method returns a CanvasPattern.
Creates a radial gradient given by the coordinates of the two circles represented by the parameters.
Creates a radial gradient given by the coordinates of the two circles represented by the parameters.
Draws the specified image. This method is available in multiple formats, providing a great deal of flexibility in its use.
Draws the specified image. This method is available in multiple formats, providing a great deal of flexibility in its use.
The ellipse() method creates an elliptical arc centered at (x, y) with the radii radiusX and radiusY. The path starts at startAngle and ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
The ellipse() method creates an elliptical arc centered at (x, y) with the radii radiusX and radiusY. The path starts at startAngle and ends at endAngle, and travels in the direction given by counterclockwise (defaulting to clockwise).
Draws a filled rectangle at (x, y) position whose size is determined by width and height.
Draws a filled rectangle at (x, y) position whose size is determined by width and height.
Draws (fills) a given text at the given (x, y) position.
Draws (fills) a given text at the given (x, y) position.
Returns an ImageData object representing the underlying pixel data for the area of the canvas denoted by the rectangle which starts at (sx, sy) and has an sw width and sh height.
Returns an ImageData object representing the underlying pixel data for the area of the canvas denoted by the rectangle which starts at (sx, sy) and has an sw width and sh height.
Returns a dash list array containing an even number of non-negative numbers.
Returns a dash list array containing an even number of non-negative numbers.
Reports whether or not the specified point is contained in the current path.
Reports whether or not the specified point is contained in the current path.
Reports whether or not the specified point is contained in the current path.
Reports whether or not the specified point is contained in the current path.
Reports whether or not the specified point is contained in the current path.
Reports whether or not the specified point is contained in the current path.
Connects the last point in the subpath to the x, y coordinates with a straight line.
Connects the last point in the subpath to the x, y coordinates with a straight line.
Moves the starting point of a new subpath to the (x, y) coordinates.
Moves the starting point of a new subpath to the (x, y) coordinates.
Paints data from the given ImageData object onto the bitmap. If a dirty rectangle is provided, only the pixels from that rectangle are painted.
Paints data from the given ImageData object onto the bitmap. If a dirty rectangle is provided, only the pixels from that rectangle are painted.
Adds a quadratic Bézier curve to the current path.
Adds a quadratic Bézier curve to the current path.
Creates a path for a rectangle at position (x, y) with a size that is determined by width and height.
Creates a path for a rectangle at position (x, y) with a size that is determined by width and height.
Restores the drawing style state to the last element on the 'state stack' saved by save().
Restores the drawing style state to the last element on the 'state stack' saved by save().
Adds a rotation to the transformation matrix. The angle argument represents a clockwise rotation angle and is expressed in radians.
Adds a rotation to the transformation matrix. The angle argument represents a clockwise rotation angle and is expressed in radians.
Saves the current drawing style state using a stack so you can revert any change you make to it using restore().
Saves the current drawing style state using a stack so you can revert any change you make to it using restore().
Adds a scaling transformation to the canvas units by x horizontally and by y vertically.
Adds a scaling transformation to the canvas units by x horizontally and by y vertically.
Resets the current transform to the identity matrix, and then invokes the transform() method with the same arguments.
Resets the current transform to the identity matrix, and then invokes the transform() method with the same arguments.
Strokes the subpaths with the current stroke style.
Strokes the subpaths with the current stroke style.
Paints a rectangle which has a starting point at (x, y) and has a w width and an h height onto the canvas, using the current stroke style.
Paints a rectangle which has a starting point at (x, y) and has a w width and an h height onto the canvas, using the current stroke style.
Draws (strokes) a given text at the given (x, y) position.
Draws (strokes) a given text at the given (x, y) position.
Multiplies the current transformation matrix with the matrix described by its arguments.
Multiplies the current transformation matrix with the matrix described by its arguments.
Inherited methods
Concrete fields
Back-reference to the canvas element for which this context was created. Read only.
Back-reference to the canvas element for which this context was created. Read only.
A CSS color, a CanvasGradient or CanvasPattern, to use as a fill.
A CSS color, a CanvasGradient or CanvasPattern, to use as a fill.
Alpha value that is applied to shapes and images before they are composited onto the canvas. Default 1.0 (opaque).
Alpha value that is applied to shapes and images before they are composited onto the canvas. Default 1.0 (opaque).
With globalAlpha applied this sets how shapes and images are drawn onto the existing bitmap. Possible values: source-atop source-in source-out source-over (default) destination-atop destination-in destination-out destination-over lighter darker copy xor
With globalAlpha applied this sets how shapes and images are drawn onto the existing bitmap. Possible values: source-atop source-in source-out source-over (default) destination-atop destination-in destination-out destination-over lighter darker copy xor
A boolean value indicating whether to smooth scaled images or not. The default value is true.
A boolean value indicating whether to smooth scaled images or not. The default value is true.
Type of endings on the end of lines. Possible values: butt (default), round, square
Type of endings on the end of lines. Possible values: butt (default), round, square
Defines the type of corners where two lines meet. Possible values: round, bevel, miter (default)
Defines the type of corners where two lines meet. Possible values: round, bevel, miter (default)
Color of the shadow. Default fully-transparent black.
Color of the shadow. Default fully-transparent black.
Horizontal distance the shadow will be offset. Default 0.
Horizontal distance the shadow will be offset. Default 0.
Vertical distance the shadow will be offset. Default 0.
Vertical distance the shadow will be offset. Default 0.
A CSS color, a CanvasGradient or CanvasPattern, to use as a line around shapes.
A CSS color, a CanvasGradient or CanvasPattern, to use as a line around shapes.
Possible values: start (default), end, left, right or center.
Possible values: start (default), end, left, right or center.