Added eval filter.

scripts/modules/filter.eval.js

@@ -0,0 +1,27 @@
+Filter.prototype.filter_eval = function(pixels = this.pixels(),p = null)
+{
+  console.log("working");
+
+  // : eval {x} % 100 == 0
+  
+  var data = pixels.data;
+  
+  for (var i = 0; i < data.length; i += 4) {
+    
+    var x = (i/4) % pixels.width;
+    var y = Math.floor((i/4)/pixels.width);
+    
+    var q = (x % parseInt(p[0]) === 0 && y % parseInt(p[1]) === 0);
+    
+    if(q === true){
+      data[i]     = 255;     // red
+      data[i + 1] = 0; // green
+      data[i + 2] = 0; // blue
+      data[i + 3] = 255; // alpha?
+    }
+  }
+  
+	ronin.canvas.clear();
+	ronin.canvas.context().putImageData(pixels, 0, 0, 0, 0, pixels.width, pixels.height);
+  console.log("done.");
+}

scripts/modules/filter.js

@@ -19,6 +19,9 @@ function Filter(element)
       case "chromatic":
         this.filter_chromatic(this.pixels(),p);
         break;
+      case "eval":
+        this.filter_eval(this.pixels(),p);
+        break;
     }
   }