Qt 5.11 | Qt Quick | Qt Quick Examples - Shapes | sampling.qml Example File

Qt 5.11.3 Reference Documentation

# sampling.qml Example File

shapes/content/sampling.qml

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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") }
          }

          Row {
              anchors.fill: parent
              anchors.margins: 20
              spacing: 40

              Column {
                  spacing: 40

                  Text {
                      text: "Original"
                  }

                  // A simple Shape without anything special.
                  Rectangle {
                      color: "lightGray"
                      width: 400
                      height: 200

                      Shape {
                          x: 30
                          y: 20
                          width: 50
                          height: 50
                          scale: 2

                          ShapePath {
                              strokeColor: "green"
                              NumberAnimation on strokeWidth { from: 1; to: 20; duration: 5000 }
                              fillColor: "transparent"
                              capStyle: ShapePath.RoundCap

                              startX: 40; startY: 30
                              PathQuad { x: 50; y: 80; controlX: 0; controlY: 80 }
                              PathLine { x: 150; y: 80 }
                              PathQuad { x: 160; y: 30; controlX: 200; controlY: 80 }
                          }
                      }
                  }

                  Text {
                      text: "Supersampling (2x)"
                  }

                  // Now let's use 2x supersampling via layers. This way the entire subtree
                  // is rendered into an FBO twice the size and then drawn with linear
                  // filtering. This allows having some level of AA even when there is no
                  // support for multisample framebuffers.
                  Rectangle {
                      id: supersampledItem
                      color: "lightGray"
                      width: 400
                      height: 200

                      layer.enabled: true
                      layer.smooth: true
                      layer.textureSize: Qt.size(supersampledItem.width * 2, supersampledItem.height * 2)

                      Shape {
                          x: 30
                          y: 20
                          width: 50
                          height: 50
                          scale: 2

                          ShapePath {
                              strokeColor: "green"
                              NumberAnimation on strokeWidth { from: 1; to: 20; duration: 5000 }
                              fillColor: "transparent"
                              capStyle: ShapePath.RoundCap

                              startX: 40; startY: 30
                              PathQuad { x: 50; y: 80; controlX: 0; controlY: 80 }
                              PathLine { x: 150; y: 80 }
                              PathQuad { x: 160; y: 30; controlX: 200; controlY: 80 }
                          }
                      }
                  }
              }

              Column {
                  spacing: 40

                  Text {
                      text: "Multisampling (4x)"
                  }

                  // Now let's use 4x MSAA, again via layers. This needs support for
                  // multisample renderbuffers and framebuffer blits.
                  Rectangle {
                      color: "lightGray"
                      width: 400
                      height: 200

                      layer.enabled: true
                      layer.smooth: true
                      layer.samples: 4

                      Shape {
                          x: 30
                          y: 20
                          width: 50
                          height: 50
                          scale: 2

                          ShapePath {
                              strokeColor: "green"
                              NumberAnimation on strokeWidth { from: 1; to: 20; duration: 5000 }
                              fillColor: "transparent"
                              capStyle: ShapePath.RoundCap

                              startX: 40; startY: 30
                              PathQuad { x: 50; y: 80; controlX: 0; controlY: 80 }
                              PathLine { x: 150; y: 80 }
                              PathQuad { x: 160; y: 30; controlX: 200; controlY: 80 }
                          }
                      }
                  }
              }
          }
      }