--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nodejs/animate.js	Tue Aug 17 05:15:50 2010 +0800
@@ -0,0 +1,39 @@
+var sys=require("sys");
+
+function linear_draw() {
+    if (this.end == 1) return;
+    var percent = (Date.now() - this.starttime)/this.duration;
+	if (percent > 1) percent = 1;
+    this.obj[5] = (this.target-this.startpos)*percent+this.startpos;
+	this.app.refresh();
+	var self = this;
+	if (percent < 1) {
+	    this.obj.timer=setTimeout(function() { self.draw();}, 20);
+		return;
+	}
+	this.app.refresh();
+	this.obj.animated_linear = null;
+}
+function linear(app,obj,target,duration) {
+    try {
+        if (obj.animated_linear) {
+	        obj[5] = obj.animated_linear.target;
+			obj.animated_linear.end = 1;
+		}
+	} catch(e) {
+	    
+	}
+	obj.animated_linear = this;
+	this.app = app;
+	this.obj = obj;
+	this.end = 0;
+	this.starttime = Date.now();
+	this.startpos = obj[5];
+    this.target = target;
+	this.duration = duration*1000;
+}
+
+
+exports.linear = linear;
+linear.prototype.start = linear_draw;
+linear.prototype.draw = linear_draw;