qml rectangle with customized rounded borders

Question

So there was need of qml rectangle with customized rounded corners. I ended up crating one with shapes, pathLines, pathArcs and bit of math.

Somehow my arcs/rounded corners are not sharp/fine as Rectangle with radius property. How cam I make those corners more fine ?

Item {
        anchors.centerIn: parent
        id: root
        width: 300
        height: 300
        property string color: 'red'
        property int rightTopCornerRadius: 10
        property int rightBottomCornerRadius: 20
        property int leftBottomCornerRadius: 30
        property int leftTopCornerRadius: 40

        Shape {

             ShapePath {

                strokeWidth: 5
                strokeColor: root.color
                startX: root.leftTopCornerRadius > 0 ? root.leftTopCornerRadius : 0
                startY: 0
                fillColor: "transparent"
                capStyle: ShapePath.RoundCap
                 fillRule:ShapePath.WindingFill

                PathLine { y: 0; x:root.width - root.rightTopCornerRadius}
                PathArc {
                    x: root.width; y: root.rightTopCornerRadius
                    radiusX: root.rightTopCornerRadius; radiusY: root.rightTopCornerRadius

                }

                PathLine { x:root.width; y:root.height - root.rightBottomCornerRadius}
                PathArc {
                    x:root.width - root.rightBottomCornerRadius; y: root.height
                    radiusX: root.rightBottomCornerRadius; radiusY: root.rightBottomCornerRadius
                }

                PathLine { x:root.leftBottomCornerRadius; y:root.height}
                PathArc {
                    x:0; y: root.height - root.leftBottomCornerRadius
                    radiusX: root.leftBottomCornerRadius; radiusY: root.leftBottomCornerRadius
                }

                PathLine { x:0; y:root.leftTopCornerRadius}
                PathArc {
                    x:root.leftTopCornerRadius; y: 0
                    radiusX: root.leftTopCornerRadius; radiusY: root.leftTopCornerRadius
                }
            }
        }
    }
}

Above Code Output

where else Normal rectangle with rounded corners with very fine borders.

Rectangle {
       anchors.centerIn: parent
       width: 300
       height: 300
       radius: 30
       border.width: 5
    }

Rounded Rectangle

I tried playing with some of the share properties, but nothing helped. like joinstyle, capstyle, fillrule

Possible duplicate of https://stackoverflow.com/questions/48895449/how-do-i-enable-antialiasing-on-qml-shapes — Stephen Quan, Apr 04 '23 at 22:03

folibis · Accepted Answer · 2023-04-04T10:44:41.863

Ok, there are several options to do that. First of all you have to turn the QtQuick multisampling on. Add the following lines into your main.cpp:

QGuiApplication app(argc, argv);

QSurfaceFormat format;                       //
format.setSamples(8);                        //  add these lines, change the value if needed
QSurfaceFormat::setDefaultFormat(format);    // 

QQmlApplicationEngine engine;

Then you can play with Item.antialiasing and Item.smooth properties of your Shape.

Besides that, I would recommend to write a custom item using QQuickItem deriving, taking the Rectangle sources as example.

Here are 2 images: your Shapes with 8 samples, antialiasing: true, smooth: true, and a common Rectangle with default settings:

Thank you , for the solution and suggesting a more standard approach to have control over Rectangle. — codemaths, Apr 05 '23 at 01:43

qml rectangle with customized rounded borders

1 Answers1