Qt's paint system enables painting on screen and print devices using the same API, and is primarily based on the QPainter , QPaintDevice ，和 QPaintEngine 类。
QPainter is used to perform drawing operations, QPaintDevice is an abstraction of a two-dimensional space that can be painted on using a QPainter ，和 QPaintEngine provides the interface that the painter uses to draw onto different types of devices. The QPaintEngine class is used internally by QPainter and QPaintDevice , and is hidden from application programmers unless they create their own device type.
The main benefit of this approach is that all painting follows the same painting pipeline making it easy to add support for new features and providing default implementations for unsupported ones.
这些类提供在描绘设备上进行描绘的支持。
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Monochrome (1-bit depth) pixmaps |
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定义 QPainter 绘制形状的填充图案 |
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基于 RGB、HSV 或 CMYK 值的颜色 |
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Maps device independent QColors to device dependent pixel values |
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Used in combination with QBrush to specify a conical gradient brush |
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Specifies a font used for drawing text |
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字体规格信息 |
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字体规格信息 |
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Template class that represents a NxM transformation matrix with N columns and M rows |
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Used in combination with QBrush to specify gradient fills |
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在不同模式和状态下的可缩放图标 |
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用于 QIcon 渲染器的抽象基类 |
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独立于硬件的图像表示 (允许直接访问像素数据，且可以被用作描绘设备) |
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Format independent interface for reading images from files or other devices |
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Format independent interface for writing images to files or other devices |
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Two-dimensional vector using integer precision |
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Two-dimensional vector using floating point precision |
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Used in combination with QBrush to specify a linear gradient brush |
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定义矩形的 4 边距 |
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定义矩形的 4 边距 |
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Represents a paintdevice that supports multiple pages |
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可以采用 QPainter 进行描绘的对象的基类 |
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Abstract definition of how QPainter draws to a given device on a given platform |
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在 Widget 和其它描绘设备上，履行低级描绘 |
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Container for painting operations, enabling graphical shapes to be constructed and reused |
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Used to generate fillable outlines for a given painter path |
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Class to generate PDFs that can be used as a paint device |
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定义 QPainter 如何绘制线条和形状的轮廓 |
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可以用作描绘设备的离屏图像表示 |
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使用整数精度定义平面点 |
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使用浮点精度定义平面点 |
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Vector of points using integer precision |
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Vector of points using floating point precision |
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Used in combination with QBrush to specify a radial gradient brush |
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使用整数精度定义平面矩形 |
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Defines a rectangle in the plane using floating point precision |
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为描绘器指定裁剪区域 |
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Struct contains a 64-bit RGB color |
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Defines the size of a two-dimensional object using integer point precision |
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Defines the size of a two-dimensional object using floating point precision |
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Convenience class for drawing QStyle elements inside a widget |
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当采用内部 Qt fontdatabase (字体数据库) 注册字体时使用 |
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Paint device that is used to create SVG drawings |
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Used to draw the contents of SVG files onto paint devices |
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Widget that is used to display the contents of Scalable Vector Graphics (SVG) files |
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Specifies 2D transformations of a coordinate system |
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Represents a vector or vertex in 2D space |
