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                ## 3.8畫三邊形或四邊形,并填充內部 ``` void fl_xyline(int x, int y, int x1) void fl_xyline(int x, int y, int x1, int y2) void fl_xyline(int x, int y, int x1, int y2, int x3) ``` 先畫一條水平的線,再畫一條垂直的線條,最后畫一條水平線 ``` void fl_yxline(int x, int y, int y1) void fl_yxline(int x, int y, int y1, int x2) void fl_yxline(int x, int y, int y1, int x2, int y3) ``` 首先畫垂直線條,接著是水平線,最后是垂直線 ``` void fl_arc(int x, int y, int w, int h, double a1, double a2) void fl_pie(int x, int y, int w, int h, double a1, double a2) ``` 畫弧形線,兩個角度是以三點處為0度,逆時針旋轉,a2必須大于或等于a1 `fl_pie()`填充弧形內部
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