CGCONTEXT REFERENCE PDF

A graphics context contains drawing parameters and all device-specific information needed to render the paint on a page to the destination, whether the destination is a window in an application, a bitmap image, a PDF document, or a printer. Paints the area contained within the provided rectangle, using the fill color in the current graphics state. Paints the areas contained within the provided rectangles, using the fill color in the current graphics state. Paints the area of the ellipse that fits inside the provided rectangle, using the fill color in the current graphics state.

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A graphics context contains drawing parameters and all device-specific information needed to render the paint on a page to the destination, whether the destination is a window in an application, a bitmap image, a PDF document, or a printer. Paints the area contained within the provided rectangle, using the fill color in the current graphics state.

Paints the areas contained within the provided rectangles, using the fill color in the current graphics state. Paints the area of the ellipse that fits inside the provided rectangle, using the fill color in the current graphics state.

Paints a gradient fill that varies along the line defined by the provided starting and ending points. Paints a gradient fill that varies along the area defined by the provided starting and ending circles.

Displays a character array at the current text position, a point specified by the current text matrix. Sets the clipping path to the intersection of the current clipping path with the area defined by the specified rectangle. Sets the clipping path to the intersection of the current clipping path with the region defined by an array of rectangles.

Maps a mask into the specified rectangle and intersects it with the current clipping area of the graphics context. Forces all pending drawing operations in a window context to be rendered immediately to the destination device.

These properties and methods are valid only when used with a CGContext object created with the initializers listed in Creating Bitmap Graphics Contexts. Creating Bitmap Graphics Contexts. Returns the alpha information associated with the context, which indicates how a bitmap context handles the alpha component.

Sets a destination to jump to when a point in the current page of a PDF graphics context is clicked. Rules for determining which regions are interior to a path, used by the fill Path using: and clip using: methods.

An immutable graphics path: a mathematical description of shapes or lines to be drawn in a graphics context. A mutable graphics path: a mathematical description of shapes or lines to be drawn in a graphics context. Language: Swift Objective-C.

Class CGContext. A Quartz 2D drawing environment. SDKs iOS 2. Framework Core Graphics. Declaration class CGContext. Topics Creating Bitmap Graphics Contexts. Creates a bitmap graphics context with the specified callback function.

Creates a PDF graphics context. Converting Between Coordinate Spaces. Constructing a Current Graphics Path. Returns a path object built from the current path information in a graphics context. Examining the Current Graphics Path. Drawing the Current Graphics Path. Drawing Shapes. Drawing Gradients and Shadings. Drawing Text. Drawing Core Graphics Layers. Setting Fill, Stroke, and Shadow Colors. Enables shadowing with color a graphics context.

Working with the Current Clipping Path. Working with Transparency Layers. Begins a transparency layer whose contents are bounded by the specified rectangle. Begins a transparency layer. Working with the Current Transformation Matrix. Setting Path Drawing Options. Saving and Restoring Graphics State. Managing a Graphics Context. Managing a Bitmap Graphics Context. Returns the color space of a bitmap context. Returns a pointer to the image data associated with a bitmap context.

Creates and returns a CGImage from the pixel data in a bitmap graphics context. Begins a new page in a PDF graphics context. Associates custom metadata with the PDF document. Managing a Page-Based Graphics Context. Starts a new page in a page-based graphics context. Working with Core Foundation Types. Instance Methods. See Also 2D Drawing.

Related Documentation. Quartz 2D Programming Guide.

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Header: CGContext. Quartz adds the additional space to the advance between the origin of one character and the origin of the next character. Text drawing modes determine how Quartz renders individual glyphs in a graphics context. For more information, see Text Drawing Modes. The text matrix specifies the transform from text space to user space. To produce the final text rendering matrix that is used to actually draw the text on the page, Quartz concatenates the text matrix with the current transformation matrix and other parameters from the graphics state. Note that the text matrix is not a part of the graphics state—saving or restoring the graphics state has no effect on the text matrix.

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Drawing Text

These functions are used to get information about or modify parameters in the current graphics state. Interpolation quality is a graphics state parameter that controls the level of quality when an image is interpolated for example, when scaling the image. Note that this parameter is merely a hint to the context—not all contexts support all interpolation quality levels. Header: CGContext.

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The Current Graphics State

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