private Double zoomMax = 12;
        private Double zoomMin = 0.2;
        private Double zoomSpeed = 0.001;
        private Double zoom = 1;

        private void Canvas_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            zoom += zoomSpeed * e.Delta; // Ajust zooming speed (e.Delta = Mouse spin value )
            if (zoom < zoomMin) { zoom = zoomMin; } // Limit Min Scale
            if (zoom > zoomMax) { zoom = zoomMax; } // Limit Max Scale

            System.Windows.Point mousePos = e.GetPosition(canvas1);

            if (zoom > 1)
            {
                canvas1.RenderTransform = new ScaleTransform(zoom, zoom, mousePos.X, mousePos.Y); // transform Canvas size from mouse position
            }
            else
            {
                canvas1.RenderTransform = new ScaleTransform(zoom, zoom); // transform Canvas size
            }

        }