Using Compare-Standalone Edition

Using Compare-Standalone Edition

VHCompare^TM provides two types of drawing comparison modes: World Coordinate System (WCS) comparing mode and User Coordinate System (UCS) comparing mode. You can choose either of the comparing modes depending on their own circumstance.

Comparison based on WCS

 the“Compare” button.

 the "return" button.

The World Coordinate System based comparing mode is the basic mode commonly used in drawing comparison process. In most cases, the modifications of a drawing plan are carried out based on the previous drawing version, without changing the drawing’s coordinate system. Simply compare the two versions based on their original World Coordinate System will produce satisfying results.

To compare two drawings based on their original World Coordinate System (WCS), just click on the “Compare” button. The discrepant portions in the two drawings will be indicated in red and blue color lines, as the diagram shown below. 

In general, the drawing elements that show in red color in the original drawing have been further modified. The modified elements are shown in “blue” color in the later version. To undo the comparison result, click on the "return" button.

Comparison based on UCS

In certain special cases, using World Coordinate System mode to compare two drawings may produce meaningless result.  For example, if the two drawings subjected to compare are drawn on different coordinate system, or if the drawing’s coordinate system is altered by the change of viewport, or if you need to compare objects that are constructed on Model space or Paper space, meaningless results will be produced by WCS comparing mode. In such circumstance, you should compare two drawings using a User Coordinate System.

Select Base Point

 the  “Select Base Point” button

To compare the two drawings based on a User Coordinate System (UCS) defined by you, you must select the base-points for comparison first. Click on the  “Select Base Point” button on the Toolbar. Notice the cursor will change to a cross shape.

Use the cursor to select a straight line, a polyline, a line of a polygon or a line of a block on the original drawing, the end-point or intersection-point of the line will become a base-point for comparison. Then select the correspondent line in the later version drawing so that the same base-point is also selected, as the diagram shown below.

Please note that the cursor of base point will be different according to the drawing space it is applied to. For details please refer to “Comparison in Paper Space and Model Space”.

Finally click on the  “Compare” button to commence the comparison process. VHCompare^TM will show the differences between the two drawings in red and blue colors, as the diagram shown below.

If you use the Toggle View tool on the two compared drawings, they will overlay on each other according to the base-point, as the diagram shown below:

Note: Toggle View tool is only effective for the base-point comparing mode but not the select area comparing mode (Next section). 2 compared drawings will overlay on its own base-points when they are in select area comparing mode.

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