70002254 polygons combination

Summary

How to merge polygons or make other combinations

Solution

example of polygon clip between regions.

 
           //create 2 rectangle polylines 
            var pl1 = vdcanvas.AddPolyline([[0, 0, 0], [2, 0, 0], [2, 2, 0], [0, 2, 0], [0, 0, 0]], false, {});
            var pl2 = vdcanvas.AddPolyline([[1, 1, 0], [3, 1, 0], [3, 3, 0], [1, 3, 0], [1, 1, 0]], false, {});
            //get the sample points of each polyline
            var pts1 = vdcanvas.GetEntitySamplePoints(pl1);
            var pts2 = vdcanvas.GetEntitySamplePoints(pl2);
 
            //Calculate an array of regions that represent the clipping result of passed ptsarray regions according to the passed opers
            var regions = gpc.clip_oper([pts1, pts2], [gpc.OPER_UNION, gpc.OPER_UNION]);//the union of both polygons
            //var regions = gpc.clip_oper([pts1, pts2], [gpc.OPER_INT, gpc.OPER_INT]);//the  intersection
            //var regions = gpc.clip_oper([pts1, pts2], [gpc.OPER_DIFF, gpc.OPER_DIFF]);//the difference of the first minus the second
 
            //create a hatch to display the result
            var hatch = vdcanvas.AddPolyHatch(regions, regions);
            hatch.HatchProperties = vdcanvas.createNewHatchProperties('solid', null, vdConst.colorFromString("255,0,0,90"), 1.0, 0.0);
            //redraw the scene
            setTimeout(vdcanvas.redraw);

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