Qt 5.7 | Qt Quick | Qt Quick Examples - Animation | tvtennis.qml Example File

Qt 5.7.1 Reference Documentation

# tvtennis.qml Example File

animation/behaviors/tvtennis.qml

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      import QtQuick 2.0

      Rectangle {
          id: page
          width: 320; height: 480;
          color: "#1e1b18"

          // Make a ball to bounce
          Rectangle {
              id: ball

              // Add a property for the target y coordinate
              property variant direction : "right"

              x: 20; width: 20; height: 20; z: 1
              color: "#80c342"

              // Move the ball to the right and back to the left repeatedly
              SequentialAnimation on x {
                  loops: Animation.Infinite
                  NumberAnimation { to: page.width - 40; duration: 2000 }
                  PropertyAction { target: ball; property: "direction"; value: "left" }
                  NumberAnimation { to: 20; duration: 2000 }
                  PropertyAction { target: ball; property: "direction"; value: "right" }
              }

              // Make y move with a velocity of 200
              Behavior on y { SpringAnimation{ velocity: 200; }
              }

              Component.onCompleted: y = page.height-10; // start the ball motion

              // Detect the ball hitting the top or bottom of the view and bounce it
              onYChanged: {
                  if (y <= 0) {
                      y = page.height - 20;
                  } else if (y >= page.height - 20) {
                      y = 0;
                  }
              }
          }

          // Place bats to the left and right of the view, following the y
          // coordinates of the ball.
          Rectangle {
              id: leftBat
              color: "#328930"
              x: 2; width: 20; height: 90
              // ![0]
              y: ball.direction == 'left' ? ball.y - 45 : page.height/2 -45;
              Behavior on y { SpringAnimation{ velocity: 300 } }
              // ![0]
          }
          Rectangle {
              id: rightBat
              color: "#328930"
              x: page.width - 22; width: 20; height: 90
              y: ball.direction == 'right' ? ball.y - 45 : page.height/2 -45;
              Behavior on y { SpringAnimation{ velocity: 300 } }
          }

          // The rest, to make it look realistic, if neither ever scores...
          Rectangle { color: "#328930"; x: page.width/2-80; y: 0; width: 40; height: 60 }
          Rectangle { color: "#1e1b18"; x: page.width/2-70; y: 10; width: 20; height: 40 }
          Rectangle { color: "#328930"; x: page.width/2+40; y: 0; width: 40; height: 60 }
          Rectangle { color: "#1e1b18"; x: page.width/2+50; y: 10; width: 20; height: 40 }
          Repeater {
              model: page.height / 20
              Rectangle { color: "#328930"; x: page.width/2-5; y: index * 20; width: 10; height: 10 }
          }
      }