Good evening All.

I've literally started playing with processing this evening (2 hours or so) so please excuse me if my questions are REALLY stupid.

I am making a polargraphic plotter using an arduino (the physical arduino side of it i have working fine) and am venturing into the world of processing to process the images i wish to plot, into workable serial data (which i will then push into the arduino, or at least, thats the plan)

Because of the way a polargraphic plotter works, i have decided to rotate the image 45 degrees left, and centre it on a frame bigger than it needs.

this "setup" part of the sketch works fine, and gives the result i want.

I then want to process the image into much larger "pixels", which will then be used to proved lower resolution greyscale data.
i initially tried just to resize the image, but it wasnt very successful, and i want the option of controlling how the pixels are averaged in the future, so i am going for the effect shown in the "get()" tutorial:


I want to scan down the image, which is 300 x 300 px, and fill squares 10 px by 10 px, with the colour of the underlying image (at this time, i am just taking the pixel in the middle of each 10 x 10 square)
When i run the sketch, the image i have loaded loads briefly in the background, but is then overlaid by 30 x 30 squares of flat grey.

can anyone point out what i have done wrong, i am currently bashing at trial and error and not really getting anywhere.

here is my sketch:

1. PImage img1;
2. 
   
3. int x = 0;
4. int y = 0;
5. void setup() {
6.   size(500, 500); // frame is 500 x 500
7.   pushMatrix();
8.   // Make a new instance of a PImage by loading an image file
9.   img1 = loadImage("STRS.jpg"); // stormtrooper image, 300 x 300
10.   translate(250, 250); // moves pivot to keep central
11.   rotate(radians(315)); // rotates 45 degrees ACW
12.   imageMode(CENTER);
13.   image(img1, 0, 0); // draws the image
14. }
15. void draw() {
16.   for (int x = 0; x < 500; x = x + 10 ) {
17.     for (int y = 0; y < 500; y = y + 10) {
18.       color c = get(x + 5, y + 5);
19.       fill(c);
20.       stroke(100); // bounded by a box, dark grey
21.       rect(x, y, x + 10, y + 10);
22.     }
23.   }
24. }

Hope someone can help, and that i haven’t done something embarrassingly stupid.

Thanks

Olly