Rockwell-automation 5370-UPK CVIM USER-PAK Option Manual de usuario descargar pdf (Pagina 91)

Chapter 8

Defining Strings for Serial Ports and Viewports

8–15

Note: For Tool viewports, the viewport boundaries are that of the screen, so

that the top left corner of the Tool viewport would be the screen corner.

For example, the draw line code:

D 10, 20 30, 40

x y dx dy

would draw a diagonal line whose starting point (x,y) coordinates would be

(10, 20) relative to the top left corner of the viewport (the coordinates in the

diagram are listed for illustrative purposes only, and are not part of the

display):

(10, 20)

(40, 60)

(0, 0)

Line drawn

Viewport border

Starting point

End point

The end point x– and y–coordinates in this example would be (40, 60). The

x–coordinate of the end point (40) is obtained by adding the dx value (30) to

the starting point x–coordinate value (10). The y–coordinate of the end point

(60) is obtained by adding the dy value (40) to the starting point

y–coordinate value (20).

Note these additional considerations regarding the dx/dy coordinates:

• Minus (–) signs can be used as a prefix to make dx and/or dy values

negative.

• A value of zero (0) can be used for dx and/or dy values. For example, if

dx is 0 and dy is non–zero, a vertical line is drawn. If dx is non–zero

and dy is 0, a horizontal line is drawn. If both dx and dy are 0, a dot is

drawn at the starting point defined by the x and y values.

• If the parameters are defined such that they would cause any portion of

the line to be drawn beyond the viewport border, the line is not drawn.

• Formula indicators (%) can be used for any of the draw line parameters.

Thus lines can be drawn whose coordinates are dependent upon formula

results. For example, the code D %1,%2 %4,%6 would have

starting point x– and y–coordinates determined by results of formulas 1

and 2, respectively. The dx and dy values would be determined by results

of formulas 4 and 6, respectively.

Note: Tool viewport strings are automatically erased and redrawn for

each inspection; this is not true for Text viewport strings. Therefore it

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Rockwell-automation 5370-UPK CVIM USER-PAK Option Manual de usuario Pagina 91