象圖映射

Delete the selected item's pixmap. 14刪除選擇項目的點(diǎn)陣圖。

To show a rotating object, we can scan-convert into the pixmap successive views from slightly different locations, one after another. 比如要顯示一個旋轉(zhuǎn)的物體，我們需要在前后連貫，變化不大的視點(diǎn)上一次接一次地進(jìn)行掃描轉(zhuǎn)換。

To display animations with raster systems, animated objects (which may consist of graphical primitives such as lines, polygons, and so on) must be scan-converted into their pixmap in the frame buffer. 為了在光柵系統(tǒng)中顯示動畫，必須將運(yùn)動物體(由如線，多邊形這樣的圖元組成)經(jīng)掃描轉(zhuǎn)換變?yōu)榭稍趲彺娣诺奈粓D。

/* free the pixmap with the given ID. */XFreePixmap(display, pixmap); 在釋放一個pixmap之后 - 我們絕對不能再訪問它。