implement currentTool

index.php

@@ -155,6 +155,8 @@
                         eraser.data[i+3] = 0;
                     }
 
+                    var currentTool = pen;
+
                     var drawing = false;
                     canvas.onmousedown = function() { drawing = true; }
                     document.onmouseup = function() {
@@ -183,15 +185,15 @@
                         var posX = e.offsetX * canvas.width / canvas.offsetWidth - 1;
                         var posY = e.offsetY * canvas.height / canvas.offsetHeight - 1;
                         
-                        ctx.putImageData(pen, posX, posY);
+                        ctx.putImageData(currentTool, posX, posY);
                     }
 
                     function setPen() {
-                        alert("pen");
+                        currentTool = pen;
                     }
 
                     function setEraser() {
-                        alert("eras");
+                        currentTool = eraser;
                     }
 
                     function clearCanvas() {