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                ## **part_system_draw_order** **設置新的粒子繪制的順序。** #### **語法:** part_system_draw_order(ind, oldtonew); The index of the particle system to change. oldtonew Whether old particles should be drawn behind newer ones (true) or vice versa (false). | 參數 | 描述 | | --- | --- | | ind | 粒子系統的ID | | oldtonew | | **返回:** N/A #### **描述** 有了這個功能,你就可以設定在屏幕上創建粒子的方式。系統默認為true,這時舊的粒子會出現的深度會比新出現的粒子更小,所以新出現的粒子總是在舊的粒子之下,但通過這個函數設置為false后,你可以扭轉這種秩序讓新的粒子出現在舊的粒子之上。下面的圖片說明了這一點,左邊的圖像是默認值true,右邊的圖像是false: ![part_system_draw_order-1](https://box.kancloud.cn/4ee8731dd87bcc242e704fb8a3b08eae_256x256.gif)|![part_system_draw_order-2](https://box.kancloud.cn/5eca97b2e89e5d85248fd6efd99ed8d4_256x256.gif) **注意:** 當粒子以添加混合模式被繪制時,這個函數的效果并不是很明顯。 舉例: ~~~ mysystem = part_system_create(); part_system_clear( mysystem, 1 ); ~~~ 這將創建一個"mysystem"的粒子系統,并將他設置為新的粒子出現在老的上面。
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