Strings for quartz font in r studio for mac

Strings for quartz font in r studio for mac how to#
Strings for quartz font in r studio for mac mac os x#

Creating a Window Graphics Context in Mac OS X UIView objects are described in detail in View Programming Guide for iOS. For more information on modified-coordinate systems and the implications in your own drawing code, see Quartz 2D Coordinate Systems. The UIView object modifies the CTM of the Quartz graphics context to match the UIKit conventions by translating the origin to the upper left corner of the view and inverting the y-axis by multiplying it by -1. In UIKit, the origin is in the upper-left corner, with the positive-y value pointing downward.

The default coordinate system used throughout UIKit is different from the coordinate system used by Quartz. You obtain this graphics context in your drawRect: method by calling the UIKit function UIGraphicsGetCurrentContext. As part of this configuration, the UIView object creates a graphics context (a CGContextRef opaque type) for the current drawing environment. Before calling your custom drawRect: method, the view object automatically configures its drawing environment so that your code can start drawing immediately. The viewвЂ™s drawRect: method is called when the view is visible onscreen and its contents need updating. To draw to the screen in an iOS application, you set up a UIView object and implement its drawRect: method to perform drawing. Drawing to a View Graphics Context in iOS After you obtain a graphics context, you can use Quartz 2D functions to draw to the context, perform operations (such as translations) on the context, and change graphics state parameters, such as line width and fill color. A graphics context is represented in your code by the data type CGContextRef, which is an opaque data type.

Strings for quartz font in r studio for mac how to#

This chapter shows you how to create a graphics context for a variety of drawing destinations. Quartz provides functions for various flavors of Quartz graphics contexts including bitmap and PDF, which you can use to create custom content. You can obtain a graphics context by using Quartz context creation functions or by using higher-level functions provided by one of the Mac OS X frameworks or the UIKit framework in iOS. A graphics context defines basic drawing attributes such as the colors to use when drawing, the clipping area, line width and style information, font information, compositing options, and several others. It contains drawing parameters and all device-specific information that the drawing system needs to perform any subsequent drawing commands. A graphics context represents a drawing destination.