improve using line,draw arc at each end point

@@ -371,76 +371,71 @@
 			drawMouse();
 		}
 
-        var draw_method = 0;
+
+		function Point(x , y, p) {
+			this.x = x;
+			this.y = y;
+			this.p = p;
+       }
+
+		var previousPoint = new Point(0, 0, 0), currentPoint = new Point(0, 0, 0);
+		var previousWidth = 0;
+		var kWIDTH_MIN = 0.2;
+		var kWIDTH_MAX = 3.0;
+		//current width
+		var strokeWidth = 3.0;
+		var rotate_degree = 0;
+		var pressure_level = 2048.0 - 1;
+		var draw_method = 0;
 
 		function draw_method_change(){
 			draw_method = document.getElementById("draw_method").selectedIndex;
 		}
 
 		function draw_ext_input(px,py,p) {
+			if(p > pressure_level) {
+				//something maybe wrong
+				return ;
+			}
 			if(draw_method == 0) {
-				draw_ext_input_arc(px,py,p);
+				draw_ext_input_dda(px,py,p);
 			}
 			else if(draw_method == 1) {
 				draw_ext_input_line(px,py,p);
 			}
 		}
 		
-		var last_ext_press = 0;
-		var last_x = 0;
-		var last_y = 0;
-		function draw_ext_input_line(px,py,p) {
-			x = px * ratio_x;
-			y = py * ratio_y;
-			if(last_ext_press == 0){
+
+
+			function draw_ext_input_line(px,py,p) {
+			if(currentPoint.p == 0){
 				if (p != 0) {
-					ctx.beginPath();
-					ctx.lineWidth = (kWIDTH_MAX - kWIDTH_MIN) / pressure_level * p + kWIDTH_MIN;
-					ctx.moveTo(x, y);
-					ctx.lineTo(x, y);
-					ctx.stroke();
-					last_x = x;
-					last_y = y;
+					currentPoint.x = px * ratio_x;
+			        currentPoint.y = py * ratio_y;
+			        currentPoint.p = p;
+        			draw_point(currentPoint);
 				}
 			}
 			else if(p != 0) {
 				ctx.beginPath();
-				ctx.lineWidth = (kWIDTH_MAX - kWIDTH_MIN)/pressure_level * p + kWIDTH_MIN;
-				ctx.moveTo(last_x, last_y);
-				ctx.lineTo(x, y);
+				ctx.moveTo(currentPoint.x, currentPoint.y);
+				ctx.lineWidth = previousWidth;
+				currentPoint.x = px * ratio_x;
+			    currentPoint.y = py * ratio_y;
+				ctx.lineTo(currentPoint.x, currentPoint.y);
 				ctx.stroke();
-				last_x = x;
-				last_y = y;
+
+			    currentPoint.p = p;
+        		draw_point(currentPoint);
 			}
 			else {
-				ctx.beginPath();
-				ctx.lineWidth = (kWIDTH_MAX - kWIDTH_MIN)/pressure_level * last_ext_press + kWIDTH_MIN;
-				ctx.moveTo(last_x, last_y);
-				ctx.lineTo(x, y);
-				ctx.stroke();
+			    currentPoint.p = p;
 			}
-
-			last_ext_press = p;
 		}
 
-		function Point(x , y, p) {
-			this.x = x;
-			this.y = y;
-			this.p = p;
-       }
-
-
-	        var previousPoint = new Point(0,0,0), currentPoint= new Point(0,0,0);
-			var previousWidth = 0;
-			var kWIDTH_MIN = 0.2;
-			var kWIDTH_MAX = 3.0;
-			//current width
-			var strokeWidth = 3.0;
-			var rotate_degree = 0;
-			var pressure_level = 2048.0 - 1;
 
-		function draw_ext_input_arc(px, py, press) {
-            if(press == 0) {
+		function draw_ext_input_dda(px, py, p) {
+            if(p == 0) {
 				previousPoint.p = 0;
 			}
 			else {
@@ -450,7 +445,7 @@
 			currentPoint.x = px * ratio_x;
 			currentPoint.y = py * ratio_y;
 			
-			currentPoint.p = press;
+			currentPoint.p = p;
 
 			if(previousPoint.p == 0) {
 				draw_point(currentPoint);
@@ -469,7 +464,7 @@
     $( "#line_width_slider" ).slider({
       range: true,
       min: 1,
-      max: 50,
+      max: 100,
       values: [ 2, 32 ],
       slide: function( event, ui ) {
         $( "#line_width" ).val(  ui.values[ 0 ] /10.0+ " - " + ui.values[ 1 ] /10.0);
@@ -2073,7 +2068,7 @@
 						<td><input type="text" id="line_width" size="10" readonly style="border:0; color:#f6931f; font-weight:bold;"/></td>>
 	
 						  <td colspan="2"><select id="pen_type" name="pen_type"><option value ="PendoTech">PendoTech PH-1820-A</option><option value ="robot">Nebula T7</option></select></td>
-						  <td colspan="2"><select id="draw_method" name="draw_method" onchange='javascript:draw_method_change();'><option value ="use_arc">use arc</option><option value ="use_line">use line</option></select></td>
+						  <td colspan="2"><select id="draw_method" name="draw_method" onchange='javascript:draw_method_change();'><option value ="use_arc">use dda</option><option value ="use_line">use line</option></select></td>
 						</tr>
 					</table>
     			</div>