/**
* Transform a Vector by a matrix and return the result in a destination vector.
*
* @param left The left matrix
* @param right The right vector
* @param dest The destination vector, or null if a new one is to be created
* @return the destination vector
*/
public static Vector2f transform(Matrix2f left, Vector2f right, Vector2f dest) {
if (dest == null) dest = new Vector2f();
float x = left.m00 * right.x + left.m10 * right.y;
float y = left.m01 * right.x + left.m11 * right.y;
dest.x = x;
dest.y = y;
return dest;
}
/**
* 将触摸屏幕的点转换为当前视图下的坐标
*
* @param touch
*/
public void touchToWorld(Vector2f touch) {
touch.x = (touch.x / glGraphics.getWidth()) * FrumWidth * zoom;
touch.y = (touch.y / glGraphics.getHeight()) * FrumHeigh * zoom;
// 在当前坐标系下的坐标
touch.add(postion).sub(FrumWidth * zoom / 2, FrumHeigh * zoom / 2);
}
/**
* Multiplies this matrix with the vector and returns the resulting vector.
*
* @param v The vector to multiply this matrix with from the right hand side.
* @return The result of the multiplication.
*/
public Vector2f multiply(Vector2f v) {
float x = m00 * v.x() + m01 * v.y();
float y = m10 * v.x() + m11 * v.y();
return new Vector2f(x, y);
}
