By Jack Xu
Книга sensible WPF pics Programming sensible WPF photos Programming Книги Графика, дизайн, звук Автор: Jack Xu Год издания: 2007 Формат: pdf Издат.:UniCAD Страниц: 690 Размер: 3.31 ISBN: 978-0-9793725-1-3 Язык: Английский0 (голосов: zero) Оценка:Все что надо по графике WPF в одной книге... Понятнакак букварь. Примеры всех возможностей 3D и second графики. Построение: графиков, 3D примитивов и многого другого.Не пожалеете.
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Figure 2-18 Ellipses in WPF. Both rectangle and ellipse have the ability to resize themselves to fill the available space. If the Height and Width properties aren’t specified, the shape is sized based on its container. The sizing behavior of a shape depends on the value of its stretch property. The default value is set to Fill, which stretches a shape to fill its container if an explicit size is not specified. 36 | Chapter 2: WPF Graphics Basics in 2D Let’s consider another example that illustrates how to place and size rectangles and ellipses in Grid cells.
In the following sections, we’ll discuss various coordinate systems and their relationships. Default Coordinates For 2D graphics, the WPF coordinate system locates the origin in the upper-left corner of the rendering area. In the 2D space, the positive X-axis points to the right, and the positive Y-axis points to downward, as shown in Figure 2-1. All coordinates and sizes in the default WPF system are measured in units of 96 dots per inch (DPI), called device-independent pixels. In this system, you can create adaptive layouts to deal with different resolutions, making sure your controls and graphics objects stretch accordingly when the window is stretched.
Both (x – xMin) and (xMax – xMin) have the same unit in the world coordinate system, which is cancelled out by division. Width, whose unit is in device-independent pixels. You can easily examine that the above conversion indeed provides not only the correct unit, but also the correct position in the default WPF coordinate system. For the Y coordinate conversion, the situation is a bit different. You need to not only perform the scaling operation, but also reverse the Y axis in the default coordinate system.