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Detecting boundaries of the target container [message #1836950]

Tue, 19 January 2021 19:08

Alex Kravets

Messages: 561
Registered: November 2009

Senior Member

I have shapes that consist of an invisible rectangle and image in the center of it. When I move one shape towards another I don't want shapes to overlap, and it works to some degree, however, it looks like boundary of target is calculated off the center of the image and not outside invisible rectangle. What ends up happening is that one shape can be positioned over the other. I check if two shapes are different by comparing their businessObjects. How can I avoid this behavior?

Below ins the progression of moving the shape, the orange outlines are the boundaries of rectangle when I cannot the shape because DefaultMoveShapeFeature.canMoveShape() returns false.

Boundaries of left shape

Boundaries of right shape

Result of moving left shape closer to right shape

[Updated on: Tue, 19 January 2021 19:18]

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Re: Detecting boundaries of the target container [message #1836953 is a reply to message #1836950]

Tue, 19 January 2021 19:26

Marek Jagielski

Messages: 97
Registered: April 2012

Member

I don't know if it would help but sometimes I just check overlapping by myself:

  public static boolean intersects(RuminaqShape label, RuminaqShape shape) {

    int xal = label.getX();
    int yal = label.getY();
    int xbl = xal;
    int ybl = yal + label.getHeight();
    int xdl = xal + label.getWidth();
    int ydl = yal;
    int xcl = xdl;
    int ycl = ybl;
    int xas = shape.getX();
    int yas = shape.getY();
    int xbs = xas;
    int ybs = yas + shape.getHeight();
    int xds = xas + shape.getWidth();
    int yds = yas;
    int xcs = xds;
    int ycs = ybs;

    return (xcl > xas && ycl > yas && xcl < xcs && ycl < ycs)
        || (xdl > xbs && ydl < ybs && xdl < xds && ydl > yds)
        || (xal < xcs && yal < ycs && xal > xas && yal > yas)
        || (xbl < xds && ybl > yds && xbl > xbs && ybl < ybs);
  }

Best,
Marek

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Re: Detecting boundaries of the target container [message #1836958 is a reply to message #1836953]

Wed, 20 January 2021 01:31

Alex Kravets

Messages: 561
Registered: November 2009

Senior Member

Thanks, there are different ways to detect collision. I wanted to see if Graphiti has something built in.

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Re: Detecting boundaries of the target container [message #1836977 is a reply to message #1836958]

Wed, 20 January 2021 13:44

Michael Wenz

Messages: 1929
Registered: July 2009
Location: Walldorf, Germany

Senior Member

Hi Alex,

Graphiti does not really have collision detection, we do something like that for checking if one shape is dragged into another one (for containers). But I'm afraid that will not help in your case, because this is not available on the API and even for non-container shapes we still allow intersection, as you have noticed. Probably you will have to implement something as Marek suggested into your move feature.

Michael

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