Qt Reference Documentation

tvtennis.qml Example File

declarative/toys/tvtennis/tvtennis.qml
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 import Qt 4.7

 Rectangle {
     id: page
     width: 640; height: 480
     color: "Black"

     // 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: "Lime"

         // 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: "Lime"
         x: 2; width: 20; height: 90
         y: ball.direction == 'left' ? ball.y - 45 : page.height/2 -45;
         Behavior on y { SpringAnimation{ spring: 1; damping: .1; } }
     }
     Rectangle {
         id: rightBat
         color: "Lime"
         x: page.width - 22; width: 20; height: 90
         y: ball.direction == 'right' ? ball.y - 45 : page.height/2 -45;
         Behavior on y { SpringAnimation{ spring: 1; damping: .1; } }
     }

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