Perspective_Transform_using_JavaFX.pde

//have to include javaFX
//references https://github.com/davidbouchard/keystone
//https://stackoverflow.com/questions/43004770/how-to-add-external-libraries-in-processing

import javax.media.jai.*;
import javax.media.jai.iterator.*;
import javax.media.jai.operator.*;
import javax.media.jai.registry.*;
import javax.media.jai.remote.*;
import javax.media.jai.tilecodec.*;
import javax.media.jai.util.*;
import javax.media.jai.widget.*;
import com.sun.media.jai.iterator.*;
import com.sun.media.jai.mlib.*;
import com.sun.media.jai.opimage.*;
import com.sun.media.jai.remote.*;
import com.sun.media.jai.rmi.*;
import com.sun.media.jai.tilecodec.*;
import com.sun.media.jai.util.*;
import com.sun.media.jai.widget.*;
import javax.media.jai.PerspectiveTransform;
import javax.media.jai.WarpPerspective;
import java.awt.Point;
import java.awt.geom.Point2D;

WarpPerspective warpPerspective;

void setup() {
  size(500, 500);
  PerspectiveTransform transform = PerspectiveTransform.getQuadToQuad(0, 0, width, 0, width, height, 0, height, 0, 0, 400, 100, 300, 400, 200, 500);
  warpPerspective = new WarpPerspective(transform);
  background(0);
  stroke(255);
  //draw example grid
  int gi = 10;
  int gj = 10;
  for(int i=0; i<=gi; i++){
    Point2D point1 = warpPerspective.mapDestPoint(new Point((int)map(i, 0, gi, 0, width), 0));
    Point2D point2 = warpPerspective.mapDestPoint(new Point((int)map(i, 0, gi, 0, width), height));
    line((float)point1.getX(), (float)point1.getY(), (float)point2.getX(), (float)point2.getY());
  }
  for(int j=0; j<=gj; j++){
    Point2D point1 = warpPerspective.mapDestPoint(new Point(0, (int)map(j, 0, gj, 0, width)));
    Point2D point2 = warpPerspective.mapDestPoint(new Point(width, (int)map(j, 0, gj, 0, width)));
    line((float)point1.getX(), (float)point1.getY(), (float)point2.getX(), (float)point2.getY());
  }
}

void draw() {
  Point2D point = warpPerspective.mapDestPoint(new Point(mouseX, mouseY));
  ellipse((float)point.getX(), (float)point.getY(), 10, 10);
}