diff --git a/src/PaperCanvas.js b/src/PaperCanvas.js
index 488c995..71e8981 100644
--- a/src/PaperCanvas.js
+++ b/src/PaperCanvas.js
@@ -22,6 +22,7 @@ class PaperCanvas extends React.Component {
     this.mouseUp = this.mouseUp.bind(this);
     this.mouseMove = this.mouseMove.bind(this);
     this.resize = this.resize.bind(this);
+    this.OnPaperParamChange = this.OnPaperParamChange.bind(this);
 
     this.importSvg = this.importSvg.bind(this);
     this.addTxt = this.addTxt.bind(this);
@@ -63,14 +64,26 @@ class PaperCanvas extends React.Component {
 
     return;
   }
+  OnPaperParamChange ()
+  {
+    console.log ("onpaperchange " + this.context.Params.Paper.width + " " + 
+        this.context.Params.Paper.height + " " + 
+        this.context.Params.Paper.usablewidth + " " + 
+        this.context.Params.Paper.usableheight);
+    this.resize ();
+    this.deleteFrame();
+    this.initFrame();
+  }
   forceCanvasPixelSize() {
     let canvasWidth = this.canvasRef.current.offsetWidth;// * window.devicePixelRatio;
     let canvasHeight = this.canvasRef.current.offsetHeight;// * window.devicePixelRatio;
+    /*
     console.log("client canvas size = " + this.canvasRef.current.clientWidth + " " + this.canvasRef.current.clientHeight);
     console.log("brut canvas size = " + this.canvasRef.current.offsetWidth + " " + this.canvasRef.current.offsetHeight);
     console.log("computed canvas size = " + canvasWidth + " " + canvasHeight);
     console.log("window.devicePixelRatio = " + window.devicePixelRatio);
     console.log("view size " + this.paper.project.view.size);
+    */
     this.canvasRef.current.width = canvasWidth;
     this.canvasRef.current.height = canvasHeight;
     this.paper.project.view.viewSize = [canvasWidth, canvasHeight];
@@ -81,7 +94,7 @@ class PaperCanvas extends React.Component {
     let xratio = canvasWidth / this.context.Params.Paper.width;
     let yratio = canvasHeight / this.context.Params.Paper.height;
     let pixelMillimeterRatio = Math.min(xratio, yratio);
-
+    /*
     //let pixelMillimeterRatio = Math.min(canvasWidth / this.context.Params.Paper.width, canvasHeight / this.context.Params.Paper.height);
     console.log("canvas size :" + canvasWidth + " " + canvasHeight);
     console.log("ratio :" + xratio + " " + yratio);
@@ -105,6 +118,7 @@ class PaperCanvas extends React.Component {
     console.log("pix ratio:" + pixelMillimeterRatio);
 
     console.log("paper view size " + this.paper.view.size.width + " " + this.paper.view.size.height)
+    */
     this.zoom = 1;
     this.pixelRatio = pixelMillimeterRatio;
   }
@@ -365,7 +379,7 @@ class PaperCanvas extends React.Component {
 
     this.deleteFrame();
     this.initFrame();
-    this.paper.view.draw();
+    //this.paper.view.draw();
   }
   SelectedDelete() {
     if (this.selected) {
diff --git a/src/Parameter.js b/src/Parameter.js
index 1d77da6..b63ce1f 100644
--- a/src/Parameter.js
+++ b/src/Parameter.js
@@ -97,6 +97,13 @@ class Parameters extends React.Component {
 
     option.Paper[key] = parseInt(value);
     this.context.SetOption(option);
+    
+    let canv = this.context.GetPaperCanvas();
+    if (canv)
+    {
+      canv.OnPaperParamChange ();
+    }   
+    
 
   }
   handleChangeNumeric (key, value)
@@ -271,20 +278,7 @@ class Parameters extends React.Component {
           </div>
           <div className="GroupColumn">
           <div className="Group">
-            <p>
-            <label>
-              Interpolation Chemin (Path):&nbsp;
-              <input type="checkbox"
-                id="svginterpol"
-                label="Interpolation des chemins SVG "
-                checked={this.context.Params.SvgInterpol}
-                onChange={(e) => {
-                  this.handleChangeGeneral('SvgInterpol', e.target.checked);
-                }}
-                key="svginterpol"
-              />
-            </label>
-            </p>
+            
             
             
             <p>