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< > BotCompany Repo | #1005517 // ImageSurfaceSelector - provide rectangular selection by mouse to ImageSurface

JavaX fragment (include) [tags: use-pretranspiled]

Libraryless. Click here for Pure Java version (19927L/123K).

sclass ImageSurfaceSelector extends ImageSurfaceMouseHandler {
  Point startingPoint;
  bool enabled = true;
  static bool verbose = false;

  *() {}
  *(ImageSurface is) {
    if (containsInstance(is.tools, ImageSurfaceSelector)) ret;
    this.register(is);
  }

  public void mousePressed(MouseEvent evt) {
    if (verbose) print("mousePressed");
    if (evt.getButton() != MouseEvent.BUTTON1) return;
    if (enabled)
      startingPoint = getPoint(evt);
  }

  public void mouseDragged(MouseEvent e) {
    if (verbose) print("mouseDragged");
    if (startingPoint != null) {
      Point endPoint = getPoint(e);
      Rectangle r = new Rectangle(startingPoint, new Dimension(endPoint.x-startingPoint.x+1, endPoint.y-startingPoint.y+1));
      normalize(r);
      r.width = min(r.width, is.getImage().getWidth()-r.x);
      r.height = min(r.height, is.getImage().getHeight()-r.y);
      is.setSelection(r);
    }
    if (verbose) print("mouseDragged done");
  }

  public static void normalize(Rectangle r) {
    if (r.width < 0) {
      r.x += r.width;
      r.width = -r.width;
    }
    if (r.height < 0) {
      r.y += r.height;
      r.height = -r.height;
    }
  }

  public void mouseReleased(MouseEvent e) {
    if (verbose) print("mouseReleased");
    mouseDragged(e);
    if (getPoint(e).equals(startingPoint))
      is.setSelection((Rectangle) null);
    startingPoint = null;
  }
}

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Snippet ID: #1005517
Snippet name: ImageSurfaceSelector - provide rectangular selection by mouse to ImageSurface
Eternal ID of this version: #1005517/9
Text MD5: 49351ddcebf4951997d6403b239f27c6
Transpilation MD5: 510bd6a86d5ef546af9039075cc9cb63
Author: stefan
Category: javax / gui
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2022-02-15 22:29:01
Source code size: 1444 bytes / 50 lines
Pitched / IR pitched: No / No
Views / Downloads: 568 / 5946
Version history: 8 change(s)
Referenced in: [show references]