TRANSFORM 4 CPs

This function is used to transform the current part giving four cursor positions. The translation part of the transformation is defined by the first and the third positions - the first is translated to the third. The rotation angle will be the angle between a line through the first two positions and a line through the last two.

(The transformation can be thought as a transformation of one coordinate system into another. The first position indicates the origin and the second one a point on the positive u-axis of the original coordinate system. The third position indicates the new origin and the fourth position a point on the positive part of the u-axis of the new coordinate system.)

The following figure illustrates the action of the function:

Figure 3:7. Figure showing the Action of the Function.