Hi, End goal don’t want to create a part using polygon drawing tool which can overlap on each other hence on creation I want to check if the bounds intersect with any other existing part. Currently when I am getting a geo for Polygon Drawing it is always giving geo path in respect to current recta…

It seems to me that you want to modify the PolygonDrawingTool.doMouseDown and doMouseMove methods to make sure the Point being used, this.diagram.lastInput.documentPoint, is not in any existing Part. Is that correct? So I suppose you could ignore such mouse events by making them no-ops if this.diag…

Not just the point but the line drawn by that points also because there can be scenarios where point is outside but line which will combine those points will be overlapping a part.

Then you will also have to see if that line segment intersects with any segment of any shape. You can call Diagram | GoJS API to restrict the number of Parts/Shapes to check.

But this is restricting the diagram on basis of rectangle but I want to achieve it for a polygon and not the rect which is containing it. Can we do it on the basis of the points some how? And how to get the points of a part which is being used to create it.

What I mentioned above does not check for the intersection of rectangles, but the intersection of polygonal edges. I’m assuming that none of the existing parts will be moving about or changing size or geometry during the drawing tool’s operation. Thus it should suffice that the tool check each segm…

But it takes rect in the parameter.

You mean Diagram.findPartsIn? Yes, that is an optimization to reduce the number of Parts whose geometries you need to check for intersection. There’s no point in checking the edges of polygons that are far away from where the user is drawing.

How can I get the points that make a part?

Parts do not have points. Shape.geometry is a Geometry that does have points. When doing line segment intersection tests, you’ll find it easier to shift the test points into the coordinate system of the geometry, rather than the other way around.

But that geometry always starts from 0,0 and not the actual coordinates it has on diagram. How can I transform it into diagram relative geo.

Northwoods Software

Geo path relative coordinates

GoJS

show post in topic

Home
Categories
Guidelines
Terms of Service
Privacy Policy

Powered by Discourse, best viewed with JavaScript enabled