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: []
          }
      }
  }