我确定'm missing something obvious here. I'我试图制作一辆汽车的动画,它从左到右穿过一扇窗户,当它到达那里时绕着右侧缠绕 . 用户应该能够按上/下来调整动画的速度 . 当我使用 PathTransition
对象时,我有动画,但发现你无法调整 PathTransition
的 Duration
,所以我在 Timeline
中重新编写它 .
但是,对于 Timeline
,我希望是一个简洁的代码片段:
public class Project12 extends Application {
public static void main(String[] args) {
launch();
}
@Override
public void start(Stage primaryStage) {
//Create Pane to hold the car animation
Pane pane = new Pane();
//Create the RaceCarPane
RaceCarPane raceCar = new RaceCarPane();
pane.getChildren().add(raceCar); //Adds the race car to the main pane
//Create the VBox to hold components
VBox displayPane = new VBox();
displayPane.getChildren().addAll(pane, userInstructions, btnPause);
displayPane.setSpacing(15);
displayPane.setAlignment(Pos.CENTER);
//Create scene for display and add the display pane
Scene scene = new Scene(displayPane);
//Add the scene to the stage and display
primaryStage.setTitle("Project 12");
primaryStage.setResizable(false); //disable resizing of the window
primaryStage.setScene(scene);
primaryStage.show();
}
而RaceCarPane:
public class RaceCarPane extends Pane {
//Declare origin for determining polygon point locations
private double originX = 10;
private double originY = getHeight() - 10;
private Timeline carAnimation;
//Set the Timeline for the car in constructor method
public RaceCarPane() {
carAnimation = new Timeline(
new KeyFrame(Duration.millis(100), e -> moveCar()));
carAnimation.setCycleCount(Timeline.INDEFINITE);
carAnimation.play();
}
private void paint() {
//Create a polygon for the body
Polygon body = new Polygon();
body.setFill(Color.BLUE);
body.setStroke(Color.DARKBLUE);
//Add points to the body
ObservableList<Double> bodyList = body.getPoints();
/*(code omitted, just adding coordinates to the ObservableList for all parts.
I don't believe the bug is here since it displayed when I was using a PathTransition animation)*/
//Add to pane
getChildren().addAll(body, roof, frontWheel, rearWheel);
}
public void setOrigin (double x, double y) {
this.originX = x;
this.originY = y;
}
@Override
public void setWidth(double width) {
super.setWidth(width);
paint();
}
@Override
public void setHeight(double height) {
super.setHeight(height);;
paint();
}
public void moveCar() {
//Check that car is in bounds
if(originX <= getWidth()) {
originX += 10;
paint();
}
else {
originX = 0;
paint();
}
编辑:Per @Jai的评论如下,我的解决方案是恢复到 PathTransition
对象并使用 RateProperty
绑定到 SimpleDoubleProperty
. 虽然可能不是该项目所寻求的解决方案,但它可以解决问题,所以我很开心!
2 回答
@swpalmer说你不应该反复添加它是正确的 .
除此之外,您绝对可以使用Animation.rateProperty()(
PathTransition
extendsAnimation
)来使用PathTransition
.另外,来自PathTransition:
因此,如果您使用
Timeline
,您还应该设置整个节点的translateX
和translateY
(即RaceCarPane
)来执行动画;试图反复添加多边形绝对是错误的方法 . 如果您在使用PathTransition
时也添加了很多多边形,那么您可能也没有做到这一点 . 即使动画在视觉上是正确的,也并不总是意味着它是正确完成的 .看起来你错过了paint方法中的右大括号 .
有一些事情是“错误的” . 首先,您不应每次想要移动汽车时创建新对象并将其添加到场景图中 . 你也忽略了你如何使用originX,originY .
我建议你用一个小组来 grab 汽车的各个部分 . 将它添加到RaceCarPane并使用组对象上的变换来移动它 .
如果您基于AnimationTimer而不是时间轴,这可能会更容易,特别是如果您希望能够动态调整汽车的速度 .