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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ## 3.11覆蓋畫圖函數 ``` void fl_overlay_rect(int x, int y, int w, int h); void fl_overlay_clear(); ``` 前者與先前顏色異或操作,后者清楚異或操作 使用該函數非常的巧妙,你應該在控件中有handle()和draw()函數,draw()應該調用fl_overlay_clear()在做任何事情之前。Handle()函數應該調用window()->make_current()然后在FL_DRAG事件中調用fl_overlay_rect(),在FL_RELEASE事件中調用fl_overlay_clear().
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