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Misc/displayRGB.pde

@@ -6,7 +6,9 @@
 // ----------------------------------------------------------
 
 
-// image file (csv)
+// Settings
+
+// image file to read (raw RGB)
   String fileName = "q.rgb";
 
 // Image resolution
@@ -14,41 +16,43 @@
   int resY = 480;
 
 
-byte[] rgbFile; 
+// ----------------------------------------------------------
-int xPos = 0;
+
-int yPos = 0;
+// Misc variables 
+
+  byte[] rgbFile;            // store for the file contents
 
 
-//   ----------------------------------------------------------------------------------------
+// ----------------------------------------------------------
 
 
 void setup() {
   
-  // open csv file
+  // open the RGB file
     rgbFile = loadBytes(fileName);
     print(fileName + " file size = ");
     println(rgbFile.length);
   
-  size(640,480);
+  size(640,480);        // screen size
-  background(0);   
+  background(0);        // background colour of screen (0 = black)
-  noLoop();
+  noLoop();             // do not keep redrawing the screen
-  stroke(255);
   
 }  // setup
 
 
-//   ----------------------------------------------------------------------------------------
+// ----------------------------------------------------------
 
 
 void draw() {
   
+  int xPos;
+  int yPos;
+  
+  // work through the RGB file plotting each pixel on the screen
   for(int i = 0; i < (rgbFile.length - 2); i+=3) {
-          // increment image position
+      // Calculate x and y location in image  
-            xPos = xPos + 1;
+        xPos = (i / 3) % resX;
-            if (xPos == resX) {
+        yPos = floor( (i / 3) / resX);
-               xPos = 0;
-               yPos = yPos  + 1;
-            }
       stroke(rgbFile[i+2] & 0xff,rgbFile[i+1] & 0xff,rgbFile[i+0] & 0xff);
       point(resX-xPos,yPos);
     }
@@ -58,6 +62,5 @@ void draw() {
 }   // draw
 
 
-//   ----------------------------------------------------------------------------------------
+// ----------------------------------------------------------
-
+// end
-