Agilent Technologies 4294A, Programming Manual

Page: 153 / 518

Chapter 11 153
Using HP Instrument BASIC
Displaying Graphics
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BASIC
Hard copy
You can produce hard copy output of graphics by use of the printing feature. Press the
START
key located under the
[Copy]
key.
Default setting
The default setting when the power is turned on is as follows.
• MOVE 0,0
A sample graphics program
Here follows a simple example to draw a line on the graphics screen.
Drawing a straight line
The program below draws a straight line from the point (50, 200) to another (300, 200).
GCLEAR ! Initializes the graphics screen.
MOVE 50,200 ! Moves the pen to the point (50, 200).
DRAW 300,200 ! Draws a straight line to the point (300, 200).
END
Drawing a circle
Here follows an example of sub-program for drawing a circle. Giving coordinates of the
center and a radius to this sub-programs as arguments allows you to draw a circle.
Changing the start value and the end value of the parameter Theta in this sub-program
allows you to draw a circular arc too.
SUB Drawcircle(Centx,Centy,R) !
DEG ! Uses "°" has the unit of agnle.
X=Centx+R !
Y=Centy !
MOVE X,Y ! Moves the pen to the start point.
For Theta=1 to 360 !
X=INT(COS(Theta)*R+Centx) ! Calculates the x coordinate of a
point on the circle
Y=INT(SIN(Theta)*R+Centy) ! Calculates the y coordinate of a
point on the circle.
DRAW X,Y ! Draws a line to the point (X, Y)
NEXT Theta !
SUBEND !