Moved scaling stuff into a module

sources/scripts/modules/brush.js

@@ -0,0 +1,43 @@
+function Brush()
+{
+  Module.call(this,"brush");
+
+  this.settings = {size:10,color:"#f00"};
+
+  this.thickness = function(line)
+  {
+    var ratio = 1 - (distance_between(line.from,line.to)/15.0);
+    return this.settings.size * ratio;
+  }
+
+  this.stroke = function(line)
+  {
+    ronin.commander.blur();
+    var ctx = ronin.render.context();
+
+    ctx.beginPath();
+    ctx.globalCompositeOperation="source-over";
+    ctx.moveTo(line.from.x * 2,line.from.y * 2);
+    ctx.lineTo(line.to.x * 2,line.to.y * 2);
+    ctx.lineCap="round";
+    ctx.lineWidth = this.thickness(line);
+    ctx.strokeStyle = this.settings.color;
+    ctx.stroke();
+    ctx.closePath();
+  }
+
+  this.mod_size = function(mod)
+  {
+    this.settings.size = clamp(this.settings.size+mod,1,100);
+  }
+
+  function clamp(v, min, max)
+  { 
+    return v < min ? min : v > max ? max : v; 
+  }
+
+  function distance_between(a,b)
+  {
+    return Math.sqrt( (a.x-b.x)*(a.x-b.x) + (a.y-b.y)*(a.y-b.y) );
+  }
+}

sources/scripts/modules/eraser.js

@@ -0,0 +1,23 @@
+function Eraser()
+{
+  Module.call(this,"eraser");
+
+  this.thickness = function(line)
+  {
+    return ronin.brush.thickness(line);
+  }
+
+  this.stroke = function(line)
+  {
+    var ctx = ronin.render.context();
+
+    ctx.beginPath();
+    ctx.globalCompositeOperation="destination-out";
+    ctx.moveTo(line.from.x * 2,line.from.y * 2);
+    ctx.lineTo(line.to.x * 2,line.to.y * 2);
+    ctx.lineCap="round";
+    ctx.lineWidth = this.thickness(line);
+    ctx.stroke();
+    ctx.closePath();
+  }
+}

sources/scripts/modules/frame.js

@@ -0,0 +1,4 @@
+function Frame()
+{
+  Module.call(this,"frame");
+}