CODEWITHSUNDEEP
javaintersect
a14
a14

Reputation: 31

how to find the area of intersect of Recangle2D in java

I have shapes beside each other, some of them are pasted twice on itself, i want to figure out which object is pasted through getting the percentage of intersection of 2 objects, i coded for comparing single object with all other objects, where i'll get like 90% means there is duplicated(pasted twice)
how to find the area of intersect of Recangle2D in java ? the area of rectangle is areaRect=width * Height i tried this, but didnt work :

public void perceOf2Rect(Rectangle2D r1,Rectangle2D r2){
    Rectangle2D rectArea=new Rectangle2D.Double();
    rectArea=r1.getWidth() * r2.getHeight();
}

i am using the Rectangle2D.intersect method 

 public void compareLists(List<ObjectItem01> objItm1) {
               for (int i = 0; i < objItm1.size(); i++) {
               for (int j = 0; j < objItm1.size(); j++) {
                 if (objItm1.get(i).objectID == objItm1.get(j).objectID) {
                        continue;
                }    
                 System.out.println("objID1 "+objItm1.get(i).objectID);
                 System.out.println("objID2 "+objItm1.get(j).objectID);
                 Rectangle2D rect1 =objItm1.get(i).getRect();    
                 Rectangle2D rect2 = objItm1.get(j).getRect(); 
                 Rectangle2D rectResult = new Rectangle2D.Double();
                 Rectangle2D.intersect(rect1,rect2,rectResult);  
                   testIntersectResult (rect1,rect2,rectResult);
    }}
}

in this method i got different values which means there is intersection but i want to determine the percentage of that intersection because if the intersection is 10% it is not duplicated in my case whereas 90% is duplicated 

private void testIntersectResult(Rectangle2D r1, Rectangle2D r2, Rectangle2D rectDest) {
      System.out.println("beginning of testIntersectResult method");
     Rectangle2D.intersect(r1,r2,rectDest);
    System.out.println("\nRect1:\n "+r1+"\nRect2:\n "+r2+"\nrectResult:\n "+rectDest);
}

Upvotes: 0

Views: 978

Answers (1)

m-szalik
m-szalik

Reputation: 3654

public double perceOf2Rect(Rectangle2D r1, Rectangle2D r2){
    Rectangle2D r = new Rectangle2D.Double();
    Rectangle2D.intersect(r1, r2, r);

    double fr1 = r1.getWidth() * r1.getHeight();                // area of "r1"
    double f   = r.getWidth() * r.getHeight();                  // area of "r" - overlap
    return (fr1 == 0 || f <= 0) ? 0 : (f / fr1) * 100;          // overlap percentage
}

Upvotes: 1

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