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                ## **part_type_gravity** **設置指定粒子類型的重力。** #### **語法:** part_type_gravity(ind, grav_amount, grav_direction); | 參數 | 描述 | | --- | --- | | ind | 粒子類型ID | | grav_amount | 重力加速度 | | grav_direction | 重力方向 | **返回:** N/A #### **描述** 該函數將設置影響創建的給定類型的每個粒子的引力。重力強度值加上粒子速度的每一步,通常是一個小的值,如0.5,而方向是重力“拉”的方向,遵循標準的GameMaker Studio 2的0°方向為右,90°為向上180°,向下270°。 #### **舉例:** ~~~ part_type_shape(global.p1, pt_shape_pixel); part_type_size(global.p1, 1, 3, 0, 0); part_type_scale(global.p1, 1, 1); part_type_colour1(global.p1, c_white); part_type_alpha2(global.p1, 1, 0); part_type_speed(global.p1, 2, 4, 0, 0); part_type_direction(global.p1, 0, 180, 0, 0); part_type_gravity(global.p1, 0.20, 270); part_type_orientation(global.p1, 0, 0, 0, 0, 1); part_type_blend(global.p1, 1); part_type_life(global.p1, 15, 60); ~~~ 上面的代碼將設置各種粒子值,包括重力,每步的速度都將增加0.2,方向為270°,因此會將粒子拉向屏幕的底部。
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