curve.qml

                Canvas {
                    id: canvasTest
                    property int ratio: Screen.devicePixelRatio
                    width: 100 //* ratio
                    height: 100 //* ratio
                    //scale: 1/ratio

                    Path {
                        id: myPath1
                        startX: 0; startY: 50
                        PathCurve { x: 25; y: 15 }
                        PathCurve { x: 50; y: 53 }
                        PathCurve { x: 75; y: 40 }
                        PathCurve { x: 100; y: 65 }
                    }
                    Path {
                        id: myPath2
                        startX: 0; startY: 50
                        PathCurve { x: 25; y: 49 }
                        PathCurve { x: 50; y: 40 }
                        PathCurve { x: 75; y: 36 }
                        PathCurve { x: 100; y: 70 }
                    }
                    onPaint: {
                        var ctx = getContext("2d")
                        //ctx.scale(ratio, ratio)
                        //ctx.save();
                        ctx.lineWidth = 1
                        ctx.strokeStyle = "blue"
                        ctx.path = myPath1;
                        ctx.stroke();
                        ctx.path = myPath2
                        ctx.stroke();

                        // stroke using line width and stroke style
                    }

               }