Mouse Click is on the wrong side of the x axis

hen

Hi so I am doing a bit of colour tracking with the view to passing info on to my arduino and then a stepper motor, I wanted to mirror my webcam feed and have done so successfully but no when i click to track a colour the mouse clicks a colour on the opposite side of the x axis.

import processing.video.*;

float tempX;  //temporal x value for trigonometry 
float tempY;  //temporal y value for trigonometry 
float tempAngle; // //temporal angle value for trigonometry 
float currentAngle=0;
float previousAngle=0;

// Variable for capture device
Capture video;


// A variable for the color we are searching for.
color trackColor; 

void setup() {
  size(640, 480);
  video = new Capture(this, width, height);
  video.start();
  // Start off tracking for red
  trackColor = color(255, 0, 0);
  smooth();
}

void draw() {
  // Capture and display the video
  if (video.available()) {
    video.read();
  }
  video.loadPixels();
  image(video, 0, 0);
      pushMatrix();
      scale(-1, 1);
      image(video.get(), -width, 0);
      popMatrix();

  // Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.
  float worldRecord = 500; 

  // XY coordinate of closest color
  int closestX = 0;
  int closestY = 0;

  // Begin loop to walk through every pixel
  for (int x = 0; x < video.width; x ++ ) {
    for (int y = 0; y < video.height; y ++ ) {
      int loc = x + y*video.width;
      // What is current color
      color currentColor = video.pixels[loc];
      float r1 = red(currentColor);
      float g1 = green(currentColor);
      float b1 = blue(currentColor);
      float r2 = red(trackColor);
      float g2 = green(trackColor);
      float b2 = blue(trackColor);

      // Using euclidean distance to compare colors
      float d = dist(r1, g1, b1, r2, g2, b2); // We are using the dist( ) function to compare the current color with the color we are tracking.

      // If current color is more similar to tracked color than
      // closest color, save current location and current difference
      if (d < worldRecord) {
        worldRecord = d;
        closestX = x;
        closestY = y;
      }
    }
  }

  // We only consider the color found if its color distance is less than 10. 
  // This threshold of 10 is arbitrary and you can adjust this number depending on how accurate you require the tracking to be.

  if (millis()%10000%1 == 0) {

    if (worldRecord < 10) { 
      // Draw a circle at the tracked pixel
      fill(trackColor);
      strokeWeight(4.0);
      stroke(0);
      ellipse(closestX, closestY, 40, 40);

      if ((closestX<320)&&(closestY<240)) {   // Square 1
        println("SQ1");
      }
      if ((closestX<320)&&(closestY>240)) {  //Square 2
        println("SQ2");
      }
      if ((closestX>320)&&(closestY>240)) {  //Square 3
        println("SQ3");
      }
      if ((closestX>320)&&(closestY<240)) {  //Square 4
        tempX = closestX-320;
        tempY = closestY;
        currentAngle = degrees (atan(tempY/tempX));

        tempAngle = currentAngle - previousAngle;

        println("current angle is :" + currentAngle);
        println("previous angle is:" + previousAngle);
        println("difference is:" + tempAngle);


        previousAngle = (currentAngle);
      }
    }
  }
}

void mousePressed() {

  // Save color where the mouse is clicked in trackColor variable
  int loc = mouseX + mouseY*video.width;
  trackColor = video.pixels[loc];

}

I used

      pushMatrix();
      scale(-1, 1);
      image(video.get(), -width, 0);
      popMatrix();

to flip the image but cannot use this to flip the mousePressed.

Any ideas,

Cheers

_vk

This?

void setup(){
  size(300, 300);
}

void draw(){
  background(255);
 int x = width - mouseX;
 int y = mouseY;
  ellipse(x, y, 10,10);
  loadPixels();
  pixels[y*width+x] = color (255, 0 ,0);
  updatePixels();
}

hen

sorry I don't understand, should I be pasting these prior to my existing entries in setup and draw

_vk

I didn't really digged into your code, it's just the logic of inverting x axis from mouse input. I think... that in your mousePressed it may be...

int x = video.width - mouseX;
int y = mouseY;
int loc =  y*video.width+x; 
trackColor = video.pixels[loc];

or something like this

hen

That's brilliant it now tracks the right side, however the ellipse that is drawn over the tracked pixel is on the wrong side, have I upset the whole sketch, do I have to change the X axis for everything? Thank you so much for your help.