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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 int targetY : page.height - 10
+ 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 follow the target y coordinate, with a velocity of 200
+ SpringFollow on y { to: ball.targetY; velocity: 200 }
+
+ // Detect the ball hitting the top or bottom of the view and bounce it
+ onYChanged: {
+ if (y <= 0) {
+ targetY = page.height - 20;
+ } else if (y >= page.height - 20) {
+ targetY = 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
+ SpringFollow on y {
+ to: ball.y - 45; velocity: 300
+ enabled: ball.direction == 'left'
+ }
+ }
+ Rectangle {
+ id: rightBat
+ color: "Lime"
+ x: page.width - 22; width: 20; height: 90
+ SpringFollow on y {
+ to: ball.y-45; velocity: 300
+ enabled: ball.direction == 'right'
+ }
+ }
+
+ // 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 }
+ }
+}