Line Defined By Four Points (Extended Line)
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The extended line allows you to draw a line where the end points of the line are independent of the points defining the direction of a line. For example, if you wish to draw the cotangent of two circles but want the cotangent to extend beyond the circles.
1. Select the tool,
2. Draw the line joining the two tangent points just as if you were using the simple "line defined by end points" tool. This process will determine the direction of the line - but we are not finished yet. Next we have to tell FX Draw where to stop and start the line.
3. Move the mouse to one end of the line you want to draw and click. Then move to the other end of the line and click.
The line will be created with four control points. The two red control points (1) are fixed to the cotangent points and define the direction of the line. The two amber control points (2) define the ends of the line. These control points are amber because they are locked onto the line defined by the first two points.