HP 5961-0509 manual Example Drawing Bezier Curves, 20-8The Vector Group

Figure 20-5 Drawing arcs (3 of 3)

Drawing Bezier Curves

The Bezier Absolute (BZ) and Bezier Relative (BR) commands use your current pen position as the first control point in the Bezier curve. You specify the second, third, and fourth control points. If you are drawing more than one curve, the fourth control point of the first curve (X3, Y3) becomes the first control point of the next curve.

The following example shows a simple command sequence using BZ to draw a Bezier Curve in the shape of a sine wave (shown in the figure following the example).

Table 20-5 Example: Drawing Bezier Curves

ECE	Reset the printer.
EC%ØB	Enter HP-GL/2 mode.
IN;	Initialize HP-GL/2.
SP1;	Select pen number 1. The SP command
	must be used to enable printing.
PA1000,5000;PD;	Specify absolute plotting and move to
	position (1000,5000); pen down.
BZ2000,8000,	Draw a Bezier curve with (1000,5000) as
4000,2000,5000,5000;	the starting point (first control point).
	Specify (2000,8000), (4000,2000), and
	(5000,5000) as the second, third, and
	fourth control points.
EC%ØA	Enter the PCL mode.

20-8The Vector Group EN