int gridW = 15;
int gridH = 15;
int xStep = 60;
int yStep = 60;


PShape[] imageList; 

void setup()
{
 size(800, 800);
 smooth();

 imageList = new PShape[9];
 imageList[0] = loadShape("perm1.svg");
 imageList[1] = loadShape("perm2.svg");
 imageList[2] = loadShape("perm3.svg");
 imageList[3] = loadShape("perm4.svg");
 imageList[4] = loadShape("perm5.svg");
 imageList[5] = loadShape("perm6.svg");
 imageList[6] = loadShape("perm7.svg");
 imageList[7] = loadShape("perm8.svg");
 imageList[8] = loadShape("perm9.svg");
}

void draw()
{
 background(255);
 int newIndex;
 for (int i=0; i < gridW; i++)
 {
 for (int j=0; j < gridH; j++)
 {
 PVector pos = new PVector(i * xStep, j * yStep);
 newIndex = calcIndex(pos, imageList.length);
 pushMatrix();
 translate(pos.x, pos.y);
 scale(.5);
 shape(imageList[newIndex], 0, 0);
 popMatrix();
 }
 }
}

int calcIndex(PVector obj, int maxIndex)
{
 float distance = dist(obj.x, obj.y, mouseX, mouseY);
 return (int)map(distance, 0, dist(0, 0, width, height), 0, maxIndex-1);
}

Example for leap motion

class VisualD {
  int shapeWidth = 60; 
  int shapeHeight = 60;  
  int gridWidth; 
  int gridHeight; 

  PShape[] imageList;

  VisualD() {

    gridWidth = width/shapeWidth+1; 
    gridHeight = height/shapeHeight+1;

    imageList = new PShape[9];
    imageList[0] = loadShape("perm1.svg");
    imageList[1] = loadShape("perm2.svg");
    imageList[2] = loadShape("perm3.svg");
    imageList[3] = loadShape("perm4.svg");
    imageList[4] = loadShape("perm5.svg");
    imageList[5] = loadShape("perm6.svg");
    imageList[6] = loadShape("perm7.svg");
    imageList[7] = loadShape("perm8.svg");
    imageList[8] = loadShape("perm9.svg");

  }

  void draw(PVector _reactorPosition, float _reactorScaler) {


    background(255);
    int newIndex;

    for (int i=0; i < gridWidth; i++)
    {
      for (int j=0; j < gridHeight; j++)
      {


        PVector pos = new PVector(i * shapeWidth, j * shapeHeight);
        newIndex = calcIndex(pos, imageList.length, _reactorPosition);
        pushMatrix();
        translate(pos.x, pos.y);
        scale(.5);
        shape(imageList[newIndex], 0, 0);
        popMatrix();

      }
    }

  }

  int calcIndex(PVector obj, int maxIndex, PVector _reactorPosition){
  float distance = dist(obj.x,obj.y, _reactorPosition.x,_reactorPosition.y);
  return (int)map(distance,0,dist(0,0,width,height),0,maxIndex-1);
}


}

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