| void |
setRotate(float degrees)
Set the matrix to rotate about (0,0) by the specified number of degrees.
|
| void |
setRotate(float degrees, float px, float py)
Set the matrix to rotate by the specified number of degrees, with a pivot point at (px, py).
|
围绕点px, py 旋转 degrees度, 如果没设置坐标,默认以0,0点旋转.
缩放,翻转
| void |
setScale(float sx, float sy)
Set the matrix to scale by sx and sy.
|
| void |
setScale(float sx, float sy, float px, float py)
Set the matrix to scale by sx and sy, with a pivot point at (px, py).
|
以点px,py为原点缩放 >=0 1为正常大小
如果是负数,图形就会翻转
如果没设置原点坐标,默认以0,0点缩放(如果发现图片不见了,检查一下是不是翻转出了屏幕)
例子:setScale(-0.5f, 1,180, 120); //左右翻转并缩放到一半大小
倾斜
| void |
setSkew(float kx, float ky, float px, float py)
Set the matrix to skew by sx and sy, with a pivot point at (px, py).
|
| void |
setSkew(float kx, float ky)
Set the matrix to skew by sx and sy.
|
以点px,py为原点倾斜如果没有设置原点,则以0,0点为原点.
坐标
| void |
setTranslate(float dx, float dy)
Set the matrix to translate by (dx, dy).
|
是图片移动到某一个位置
注意
Matrix中带有pre, post的函数需要考虑先后顺序
例如:想要旋转45度,然后平移到100,100的位置需要
Java代码 
- Matrix matrix = new Matrix();
- matrix.postRotate(45);
- matrix.postTranslate(100, 100);
或者
Java代码
- Matrix matrix = new Matrix();
- matrix.setTranslate(100, 100);
- matrix.preRotate(45);