In ZWCAD, polar tracking limits cursor to specified angles. It allows cursor movement to increments along a user defined polar angle.
Auto tracking includes polar tracking and object snap tracking. You can turn them on and off by repressing POLAR and OTRACK button on the Status Bar.
When the polar tracking mode is on, the cursor moves along the specified angle. When the object snap tracking is on, the cursor moves along an alignment path based on the snap point.
Polar Tracking
When polar tracking is turned on, guides display on the screen automatically at the polar angle increment that you specified. For example, if you draw a line with polar tracking turned on with angle increment set as 65 degrees , the rubber-banding line displays at 65 degree increments.
Polar tracking and orthogonal locking cannot be used at the same time-turning one option on turns the other option off.
To enable polar tracking and specify the polar angle increment
*Do one of the following:
Choose Tools > Drafting Setting.
On the Object Snap toolbar, click the Object Snap Settings tool.
Type settings and then press Enter.
*Click the Polar Tracking tab.
Select Polar Tracking On.
*Do one of the following to specify the polar angle increments:
In Increment, select an angle.
Mark the Additional Angles check box and click New to define a custom angle increment.
*Click OK.
TIP To toggle polar tracking on and off at any time, click the POLAR button on the status bar or press F10.
To draw objects using polar tracking
Specify Polar Angles
You can set a polar increment angle to polar tracking. The default angle includes 90, 45, 30, 22.5, 18, 15, 10 and 5 degrees. You can also type a desired angle at the textbox. The value is stored in the system variable POLARANG. The orientation of angle 0 and the direction of object snap are dependent on your settings in the Drawing Settings dialog box (UNITS).
The following illustration shows the alignment paths displayed as you move your cursor 90 degrees with the polar angle increment set to 30 degrees.
To set polar tracking angles
From the Tools menu, choose Drafting Settings.
In the Drafting Settings dialog box, on the Polar Tracking tab, select Polar Tracking On.
In the Increment Angle list, select the polar tracking angle.
To set additional tracking angles, select Additional Angles. Then click New and enter the angle value in the text box.
Under Polar Angle Measurement, specify whether polar tracking increments are based on the UCS or relative to the last object you created.
Choose OK.
Specify Polar Distances
AutoSnap restricts cursor movement to increments of a polar distance you specified on the Snap and Grid tab of Draft Settings dialog box. For example, if you specify a length of 6 units, the cursor snaps the length specified to lengths of 0, 6, 12, 18, 24, and so on.
When you move cursor, a tooltip displays the nearest PolarSnap increment. Only when polar tracking and snap mode are on, you can restrict point entry to polar distance.
To set polar snap distance
From the Tools menu, choose Drafting Settings.
In the Drafting Settings dialog box, Snap and Grid tab, select Snap On.
In Snap Type & Style, select PolarSnap.
Under Polar Spacing, enter the polar distance.
Choose the Polar Tracking tab and select Polar Tracking On.
Select the angle from the Increment Angle list. You can specify your own angles by choosing Additional Angles and then New.
Choose OK.
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