What is the difference between window and viewport in computer graphics? - ogloszenia-praca.info
Given a window and viewport, what is the transformation matrix that maps the window from world coordinates into the viewport in screen coordinates?. The capability that show some part of object internal a specify window is called you should understand the differences between a window and a viewport. 2D Window To Viewport Tranformation We can see from above that to maintain relative position we must have the following relationship.
An area on a display device to which a window is mapped is called a viewport.
What is the difference between window and viewport in computer graphics?
A viewport is a polygon viewing region in computer graphics. The viewport is an area expressed in rendering-device-specific coordinates, e.
A viewport defines in normalized coordinates a rectangular area on the display device where the image of the data appears. You can have your graph take up the entire display device or show it in only a portion, say the upper-right part.
Windows and Viewports
Window to viewport transformation: Window-to-Viewport transformation is the process of transforming a two-dimensional, world-coordinate scene to device coordinates. In particular, objects inside the world or clipping window are mapped to the viewport.
The axis tick marks are printed with the numeric 2. It also begins at 70, but is units dollars long, divided with 11 tick marks. GSET sets the text font to be Swiss and the height of the letters to be 2.
The height of the characters has been increased because the viewport definition scales character sizes relative to the viewport.
GTEXT prints horizontal text. It prints the text string Year beginning at the world coordinate point 77, It prints the text string Price beginning at the world coordinate point 68, GSHOW displays the graph. Changing Windows and Viewports Windows and viewports can be changed for the graphics segment any time that the segment is active. Using the stock price example, you can first define a window for the data during the years to and map this to the viewport defined on the upper half of the normalized device; then you can redefine the window to enclose the data for to and map this to an area in the lower half of the normalized device.
Notice how the shape of the viewport affects the shape of the curve. Changing the viewport can affect the height of any printed characters as well. The following statements generate the graph in Figure You want to clip the data that falls outside of the window.WINDOW PORT TO VIEW PORT CONVERSION
See "Clipping Your Graphs" later in this chapter for more on clipping. A window or a viewport is changed globally through the IML graphics commands: When a window or viewport is defined, it persists across IML graphics commands until another window- or viewport-altering command is encountered. Stacking helps you define a viewport without losing the effect of a previously defined viewport. When a stacked viewport is popped, you are placed into the environment of the previous viewport.
After we select the screen coordinate system, we change the picture to display interior screen that means change it into screen coordinate system. Windows and Clipping The world coordinate system is used to define the position of objects in the natural world. This system does not depend on the screen coordinate systemso the interval of number can be anything positive, negative or decimal.
Sometimes the complete picture of object in the world coordinate system is too large and complicate to clearly show on the screen, and we need to show only some part of the object. The capability that show some part of object internal a specify window is called windowing and a rectangular region in a world coordinate system is called window. Before going into clipping, you should understand the differences between a window and a viewport.
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- Windows and Viewports
A Window is a rectangular region in the world coordinate system.