Hello,

This is my first Processing project.

When the mouse is dragged close to a vertex, it is moved with the pointer. However there are two problems:
1. If I move the mouse too fast, the vertex is "lost" by the mouse and doesn't move anymore.
2. If a vertex is too close to another, they both move with the mouse.

Any idea ?

Thank you in advance.

Nesnduma

1. //
   // Displacement of vertices by mousedrag
   //
     int points = 4;
     int coords = 2;
     int bgColor = color(255, 255, 255);
    
     int[][] mesPoints = new int[points][coords];
   
   //********** SETUP
   void setup()
   {
     smooth();
     ellipseMode(CENTER);
     rectMode(CENTER);
     size(400, 400);
     background(bgColor);
     // Creates random positions for points
     // Two embedded loops
     for (int i = 0; i < points; i++) {
       for (int j = 0; j < coords; j++) {
       mesPoints[i][j] = int(random(0,400));
       }
       print("Point ");
       println(i+" :");
       println(mesPoints[i]);
     }
   }
   
   //********** DRAW
   void draw()
   {
     // Erases everything  - redraws lines
     background(bgColor);
     for (int i = 0; i < points ; i++) {
       // Draws lines
       strokeWeight(2);
       stroke(0,192,255);
       line(mesPoints[i][0], mesPoints[i][1], mesPoints[(i+1)%points][0], mesPoints[(i+1)%points][1]);
     }
     // Draws points
     for (int i = 0; i < points ; i++) {
       strokeWeight(1);
       // Points
       stroke(0,192, 255);
       fill(255,255,0);
       ellipse(float(mesPoints[i][0]), float(mesPoints[i][1]), 10., 10.);
     }
    
     //Test whether mouse rolls over points and draws red squares
       strokeWeight(1);
       stroke(255,0,0);
       fill(255,0,0);
       for (int i = 0; i < points; i++) {
         if((abs(mouseX - mesPoints[i][0]) <= 5) && (abs(mouseY - mesPoints[i][1]) <= 5)) {
           rect(mesPoints[i][0], mesPoints[i][1], 10, 10);
         }
       }
   }
   
   //********** MOUSEDRAG + UPDATE POSITIONS
   void mouseDragged() {
       strokeWeight(1);
       stroke(255,0,0);
       fill(255,0,0);
       for (int i = 0; i < points; i++) {
         if((abs(mouseX - mesPoints[i][0]) <= 5) && (abs(mouseY - mesPoints[i][1]) <= 5)) {
           mesPoints[i][0] = mouseX;
           mesPoints[i][1] = mouseY;
           rect(mesPoints[i][0], mesPoints[i][1], 10, 10);
         }
       }
   }