%usage_ImageToAndFromGraphCooridinates 
% Caveat: center of plot may be required
close all; clear all; clc;
plotRowSize = 2;
plotColSize = 2;
plotIndex = 0;

lowerRangeX = -3; 
upperRangeX = 3; 
lowerRangeY = -3; 
upperRangeY = 3; 

inputFolder = 'outputFiles';
targetFile  = 'pixeliZedScratchPad.mat';
targetFileName  = strcat(inputFolder, '\', targetFile); 
targetFile = whos('-file', targetFileName);

targetFileContents = load (targetFileName); % load map
load (targetFileName);                      % load contents

% [UM: for the time being we deal with BW, ie. 2 levels]
figure('Name', 'Image to coordinated graph', 'NumberTitle','off');
plotIndex = plotIndex + 1;
subplot(plotRowSize,plotColSize, plotIndex);
imshow(pixeliZedScratchPad, []);
title('Image');
% pixeliZedScratchPad = floor(pixeliZedScratchPad);

% image to graph coordinates
[plotCoordinates_x plotCoordinates_y] = mapPixelsToCoordinatedPlotGraph(pixeliZedScratchPad, ...
            upperRangeX, lowerRangeX, lowerRangeY, upperRangeY);
        
% graph coordinates to image
imageSize = 200;
pixeliZedScratchPad_reconstructed = plotCoordinatesToImagePixels(plotCoordinates_x, plotCoordinates_y, imageSize);

plotIndex = plotIndex + 1;
subplot(plotRowSize,plotColSize, plotIndex);        
plot(plotCoordinates_x, plotCoordinates_y, 'x');
title('Coordinated graph');
axis([lowerRangeX-1 upperRangeX+1 lowerRangeY-1 upperRangeY+1]);
grid on;
% imshow(uint8(pixeliZedScratchPad), []);

plotIndex = plotIndex + 1;
subplot(plotRowSize,plotColSize, plotIndex);
imshow(pixeliZedScratchPad_reconstructed, []);
title('Image constructed from graph coordinates');

 B9