protected void applyScale(GL10 pGL)
{
float scaleX = this.mScaleX;
float scaleY = this.mScaleY;
if (scaleX != 1 || scaleY != 1)
{
float scaleCenterX = this.mScaleCenterX;
float scaleCenterY = this.mScaleCenterY;
pGL.GlTranslatef(scaleCenterX, scaleCenterY, 0);
pGL.GlScalef(scaleX, scaleY, 1);
pGL.GlTranslatef(-scaleCenterX, -scaleCenterY, 0);
}
}
protected void applyRotation(GL10 pGL)
{
float rotation = this.mRotation;
if (rotation != 0)
{
float rotationCenterX = this.mRotationCenterX;
float rotationCenterY = this.mRotationCenterY;
pGL.GlTranslatef(rotationCenterX, rotationCenterY, 0);
pGL.GlRotatef(rotation, 0, 0, 1);
pGL.GlTranslatef(-rotationCenterX, -rotationCenterY, 0);
/* TODO There is a special, but very likely case when mRotationCenter and mScaleCenter are the same.
* In that case the last glTranslatef of the rotation and the first glTranslatef of the scale is superfluous.
* The problem is that applyRotation and applyScale would need to be "merged" in order to efficiently check for that condition. */
}
}
protected void applyTranslation(GL10 pGL)
{
pGL.GlTranslatef(this.mX, this.mY, 0);
}