Removing Topics from SVN

2026-06-16 04:26:26 +02:00 · 2011-09-05 23:44:10 +00:00
parent b99624cdb4
commit 4fc6dcca86
219 changed files with 0 additions and 31091 deletions
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-/**
- * Lens Demo Effect
- * by luis2048. 
- * 
- * A picture is shown and it looks like a magnifying glass 
- * is drawn over the picture. One of the most famous demos 
- * that has a lens effect is 2nd reality by future crew.
- * The trick is to precalculate the entire effect. Just make 
- * an array that for each pixel in the destination picture 
- * tells which pixel to take from the source picture. This 
- * array is called the transformation array. The tricky part 
- * is to calculate the transformation array to make the 
- * destination look like a lens is beeing held over the source 
- * picture. Based on lens formula by on Abe Racadabra.
- */
-
-int lensD = 256;  // Lens diameter
-int[] lensArray = new int[lensD*lensD];  // Height and width of lens
-
-PGraphics lensEffect;
-PImage lensImage;
-PImage lensImage2;
-
-int xx = 0;
-int yy = 0; 
-int dx = 1;
-int dy = 1;
-
-void setup() {
-
-  size(640, 360);
-
-  // Create buffered image for lens effect
-  lensEffect = createGraphics(width, height, P2D);
-
-  // Load background image 
-  lensEffect.beginDraw();
-  lensEffect.image(loadImage("red_smoke.jpg"), 0, 0, 
-                   lensEffect.width, lensEffect.height);
-  lensEffect.endDraw();
-
-  // Create buffered image for image to warp
-  lensImage = createGraphics(lensD, lensD, P2D);
-  lensImage2 = createGraphics(lensD, lensD, P2D);
-
-  // Lens algorithm (transformation array)
-  int magFactor = 40;  // Magnification factor
-  int m, a, b;
-
-  int r = lensD / 2;
-  float s = sqrt(r*r - magFactor*magFactor);
-
-  for (int y = -r; y < r; y++) {
-    for (int x = -r ;x < r; x++) {
-      if(x*x + y*y >= s*s) {
-        a = x;
-        b = y;
-      }
-      else {
-        float z = sqrt(r*r - x*x - y*y);
-        a = int(x * magFactor / z + 0.5);
-        b = int(y * magFactor / z + 0.5);
-      }
-      lensArray[(y + r)*lensD + (x + r)] = (b + r) * lensD + (a + r);
-    }
-  }
-}
-
-void draw() {
-
-  // Bounce lens around the screen
-  if((xx+dx+lensD > lensEffect.width) || (xx+dx < 0)) {
-    dx =- dx;
-  } 
-  if((yy+dy+lensD > lensEffect.height) || (yy+dy < 0)) {
-    dy =- dy;
-  }
-  xx += dx;
-  yy += dy;
-
-  lensImage = createGraphics(lensD, lensD, P2D);
-
-  // save the backgrounlensD of lensHeight*lensWilensDth pixels rectangle at the coorlensDinates 
-  // where the lens effect will be applielensD.
-  lensImage2.copy(lensEffect, xx, yy, lensD, lensD, 0, 0, lensD, lensD);
-
-  // output into a bufferelensD image for reuse
-  lensImage.loadPixels();
-
-  // For each pixel in the destination rectangle, apply the color
-  // from the appropriate pixel in the saved background. The lensArray
-  // array tells the offset into the saved background.
-  for (int i = 0; i < lensImage.pixels.length; i++)  {
-    lensImage.pixels[i] = lensImage2.pixels[lensArray[i]]; 
-  } 
-  lensImage.updatePixels();
-
-  // Restore the original picture
-  image(lensEffect, 0, 0, width, height); 
-
-  // Overlay the lens square
-  image(lensImage, xx, yy, lensD, lensD); 
-
-}
-