rotate()

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名称

rotate()

示例
 translate(width/2, height/2);

rotate(PI/3.0);

rect(-26, -26, 52, 52);

描述 Rotates the amount specified by the angle parameter. Angles must be specified in radians (values from 0 to TWO_PI), or they can be converted from degrees to radians with the radians() function.

The coordinates are always rotated around their relative position to the origin. Positive numbers rotate objects in a clockwise direction and negative numbers rotate in the couterclockwise direction. Transformations apply to everything that happens afterward, and subsequent calls to the function compound the effect. For example, calling rotate(PI/2.0) once and then calling rotate(PI/2.0) a second time is the same as a single rotate(PI). All tranformations are reset when draw() begins again.

Technically, rotate() multiplies the current transformation matrix by a rotation matrix. This function can be further controlled by pushMatrix() and popMatrix().

语法
rotate(angle)
参数
angle float: angle of rotation specified in radians
返回值 void
相关 popMatrix()
pushMatrix()
rotateX()
rotateY()
rotateZ()
scale()
radians()

Updated on October 2, 2018 05:02:09pm EDT

rotate()