interactive.qml Example File

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import QtQuick 2.9
import QtQuick.Shapes 1.0

Rectangle {
    id: root
    width: 1024
    height: 768

    property color col: "lightsteelblue"
    gradient: Gradient {
        GradientStop { position: 0.0; color: Qt.tint(root.col, "#20FFFFFF") }
        GradientStop { position: 0.1; color: Qt.tint(root.col, "#20AAAAAA") }
        GradientStop { position: 0.9; color: Qt.tint(root.col, "#20666666") }
        GradientStop { position: 1.0; color: Qt.tint(root.col, "#20000000") }
    }

    property int mode: 0
    property bool showResizers: true
    property bool fill: false

    Row {
        x: 20
        y: 10
        spacing: 20
        Rectangle {
            border.color: "black"
            color: root.mode === 0 ? "red" : "transparent"
            width: 100
            height: 40
            Text {
                anchors.centerIn: parent
                text: "Line"
            }
            MouseArea {
                anchors.fill: parent
                onClicked: root.mode = 0
            }
        }
        Rectangle {
            border.color: "black"
            color: root.mode === 1 ? "red" : "transparent"
            width: 100
            height: 40
            Text {
                anchors.centerIn: parent
                text: "Cubic"
            }
            MouseArea {
                anchors.fill: parent
                onClicked: root.mode = 1
            }
        }
        Rectangle {
            border.color: "black"
            color: root.mode === 2 ? "red" : "transparent"
            width: 100
            height: 40
            Text {
                anchors.centerIn: parent
                text: "Quadratic"
            }
            MouseArea {
                anchors.fill: parent
                onClicked: root.mode = 2
            }
        }

        Slider {
            id: widthSlider
            name: "Width"
            min: 1
            max: 60
            init: 4
        }

        Rectangle {
            border.color: "black"
            color: root.showResizers ? "yellow" : "transparent"
            width: 50
            height: 40
            Text {
                anchors.centerIn: parent
                text: "Manip"
            }
            MouseArea {
                anchors.fill: parent
                onClicked: {
                    root.showResizers = !root.showResizers;
                    for (var i = 0; i < canvas.resizers.length; ++i)
                        canvas.resizers[i].visible = root.showResizers;
                }
            }
        }

        Rectangle {
            border.color: "black"
            color: root.fill ? "yellow" : "transparent"
            width: 50
            height: 40
            Text {
                anchors.centerIn: parent
                text: "Fill"
            }
            MouseArea {
                anchors.fill: parent
                onClicked: root.fill = !root.fill
            }
        }
    }

    Rectangle {
        id: canvas
        width: root.width - 40
        height: root.height - 120
        x: 20
        y: 100

        property variant activePath: null

        property variant resizers: []
        property variant funcs

        function genResizer(obj, x, y, xprop, yprop, color) {
            var ma = Qt.createQmlObject('import QtQuick 2.9; import QtQuick.Shapes 1.0; Rectangle { id: rr; property variant obj; color: "' + color + '"; width: 20; height: 20;'+
                                         'MouseArea { anchors.fill: parent; hoverEnabled: true;' +
                                         'onEntered: color = "yellow"; onExited: color = "' + color + '";' +
                                         'property bool a: false; onPressed: a = true; onReleased: a = false; ' +
                                         'onPositionChanged: if (a) { var pt = mapToItem(rr.parent, mouse.x, mouse.y);' +
                                         'obj.' + xprop + ' = pt.x; obj.' + yprop + ' = pt.y; rr.x = pt.x - 10; rr.y = pt.y - 10; } } }',
                                         canvas, "resizer_item");
            ma.visible = root.showResizers;
            ma.obj = obj;
            ma.x = x - 10;
            ma.y = y - 10;
            resizers.push(ma);
            return ma;
        }

        Component.onCompleted: {
            funcs = [
                        { "start": function(x, y) {
                            var p = Qt.createQmlObject('import QtQuick 2.9; import QtQuick.Shapes 1.0; ShapePath {' +
                                                       'strokeColor: "black"; fillColor: "transparent";'+
                                                       'strokeWidth: ' + widthSlider.value + ';' +
                                                       'startX: ' + x + '; startY: ' + y + ';' +
                                                       'PathLine { x: ' + x + ' + 1; y: ' + y + ' + 1 } }',
                                                       root, "dynamic_visual_path");
                            shape.data.push(p);
                            activePath = p;
                        }, "move": function(x, y) {
                            if (!activePath)
                                return;
                            var pathObj = activePath.pathElements[0];
                            pathObj.x = x;
                            pathObj.y = y;
                        }, "end": function() {
                            canvas.genResizer(activePath, activePath.startX, activePath.startY, "startX", "startY", "red");
                            var pathObj = activePath.pathElements[0];
                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
                            activePath = null;
                        }
                        },
                        { "start": function(x, y) {
                            var p = Qt.createQmlObject('import QtQuick 2.9; import QtQuick.Shapes 1.0; ShapePath {' +
                                                       'strokeColor: "black"; fillColor: "' + (root.fill ? 'green' : 'transparent') + '";'+
                                                       'strokeWidth: ' + widthSlider.value + ';' +
                                                       'startX: ' + x + '; startY: ' + y + ';' +
                                                       'PathCubic { x: ' + x + ' + 1; y: ' + y + ' + 1;' +
                                                       'control1X: ' + x + ' + 50; control1Y: ' + y + ' + 50; control2X: ' + x + ' + 150; control2Y: ' + y + ' + 50; } }',
                                                       root, "dynamic_visual_path");
                            shape.data.push(p);
                            activePath = p;
                        }, "move": function(x, y) {
                            if (!activePath)
                                return;
                            var pathObj = activePath.pathElements[0];
                            pathObj.x = x;
                            pathObj.y = y;
                        }, "end": function() {
                            canvas.genResizer(activePath, activePath.startX, activePath.startY, "startX", "startY", "red");
                            var pathObj = activePath.pathElements[0];
                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
                            canvas.genResizer(pathObj, pathObj.control1X, pathObj.control1Y, "control1X", "control1Y", "blue");
                            canvas.genResizer(pathObj, pathObj.control2X, pathObj.control2Y, "control2X", "control2Y", "lightBlue");
                            activePath = null;
                        }
                        },
                        { "start": function(x, y) {
                            var p = Qt.createQmlObject('import QtQuick 2.9; import QtQuick.Shapes 1.0; ShapePath {' +
                                                       'strokeColor: "black"; fillColor: "' + (root.fill ? 'green' : 'transparent') + '";'+
                                                       'strokeWidth: ' + widthSlider.value + ';' +
                                                       'startX: ' + x + '; startY: ' + y + ';' +
                                                       'PathQuad { x: ' + x + ' + 1; y: ' + y + ' + 1;' +
                                                       'controlX: ' + x + ' + 50; controlY: ' + y + ' + 50 } }',
                                                       root, "dynamic_visual_path");
                            shape.data.push(p);
                            activePath = p;
                        }, "move": function(x, y) {
                            if (!activePath)
                                return;
                            var pathObj = activePath.pathElements[0];
                            pathObj.x = x;
                            pathObj.y = y;
                        }, "end": function() {
                            canvas.genResizer(activePath, activePath.startX, activePath.startY, "startX", "startY", "red");
                            var pathObj = activePath.pathElements[0];
                            canvas.genResizer(pathObj, pathObj.x, pathObj.y, "x", "y", "red");
                            canvas.genResizer(pathObj, pathObj.controlX, pathObj.controlY, "controlX", "controlY", "blue");
                            activePath = null;
                        }
                        }
                    ];
        }

        MouseArea {
            anchors.fill: parent
            onPressed: {
                canvas.funcs[root.mode].start(mouse.x, mouse.y);
            }
            onPositionChanged: {
                canvas.funcs[root.mode].move(mouse.x, mouse.y);
            }
            onReleased: {
                canvas.funcs[root.mode].end();
            }
        }

        Shape {
            id: shape
            anchors.fill: parent

            data: []
        }
    }
}