deltaTransformPoint (Matrix.deltaTransformPoint method)

Given a point in the pretransform coordinate space, returns the coordinates of that point after the transformation occurs. Unlike the standard transformation applied using the transformPoint() method, the deltaTransformPoint() method's transformation does not consider the translation parameters tx and ty.

Parameters

Returns

Example

The following example uses the deltaTransformPoint() method to create deltaTransformedPoint from myPoint. In the example, the translate() method does not alter the position of the point named deltaTransformedPoint. However, the scale() method does affect that point's position. It increases the point's x value by a factor of three from 50 to 150.

import flash.geom.Matrix;
import flash.geom.Point;

var myMatrix:Matrix = new Matrix();
trace(myMatrix); // (a=1, b=0, c=0, d=1, tx=0, ty=0)

myMatrix.translate(100, 0);
trace(myMatrix); // (a=1, b=0, c=0, d=1, tx=100, ty=0)

myMatrix.scale(3, 3);
trace(myMatrix); // (a=3, b=0, c=0, d=3, tx=300, ty=0)

var myPoint:Point = new Point(50,0);
trace(myPoint); // (50, 0)

var deltaTransformedPoint:Point = myMatrix.deltaTransformPoint(myPoint);
trace(deltaTransformedPoint); // (150, 0)

var pointMc_0:MovieClip = createRectangle(10, 10, 0xFF0000);
pointMc_0._x = myPoint.x;

var pointMc_1:MovieClip = createRectangle(10, 10, 0x00FF00);
pointMc_1._x = deltaTransformedPoint.x;

function createRectangle(width:Number, height:Number, color:Number):MovieClip {
    var depth:Number = this.getNextHighestDepth();
    var mc:MovieClip = this.createEmptyMovieClip("mc_" + depth, depth);
    mc.beginFill(color);
    mc.lineTo(0, height);
    mc.lineTo(width, height);
    mc.lineTo(width, 0);
    mc.lineTo(0, 0);
    return mc;
}