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## draw_primitive_begin——開始繪制基本體

#### **語法**

~~~
draw_primitive_begin(kind)
~~~

| 參數 | 描述 |
| --- | --- |
| kind | 用于繪制的基本圖元類型 |

#### **返回**

N/A

#### **描述**：

當你要開始定義基本幾何體時必須先調用本方法，本方法共有6中基本圖元可以使用，分別是：

*   pr_pointlist
*   pr_lineliset
*   pr_linestrip
*   pr_trianglelist
*   pr_trianglestrip
*   pr_trianglefan（在HTML5平臺無效，部分設備運作效果欠佳）

下圖即這些圖元的基本形態：![](http://7xqa61.com1.z0.glb.clouddn.com/Wechat/GMS文檔翻譯草稿/5 GML函數/_image/2017-12-24-22-30-27.png)

#### **示例：**

~~~
var i, steps, xx, yy, radius;
steps=20;
xx=50;
yy=50;
radius=30;
draw_primitive_begin(pr_trianglefan);
draw_vertex(xx, yy);
for(i = 0; i <= steps; i += 1)
   {
   draw_vertex(xx + lengthdir_x(radius, 270 * i / steps), yy + lengthdir_y(radius, 270 * i / steps));
   }
draw_primitive_end();
~~~

上述代碼繪制了3/4個圓形


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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