【发布时间】:2020-11-12 03:49:20
【问题描述】:
我正在使用 javaFX 创建一个基本动画,我有 5 个连续的矩形,我有两个圆圈,红色和蓝色。红色的 cricle 设置在第一个矩形上,蓝色的 cricle 设置在第五个矩形上。 这个想法是:如果我单击第一个矩形,我希望红色圆圈移动到第五个矩形(通过平移),一旦它到达那里,蓝色矩形(位于第五个矩形上)移动到第一个矩形,在另一个他们交换立场的话。我在我的逻辑中使用了 AnimationTimer 类,但问题是当pressedMouse事件发生时两个圆圈的动画是同步的,这不是我想要的,我想要的是蓝色圆圈的动画一旦红色圆圈的动画就开始了完成的。我想了解为什么会这样?是不是有点多线程?如果是这样,当我运行程序时,红色圆圈会卡在中间,但蓝色圆圈会超出界限并隐藏,但是如果我评论其中一个圆圈的位置代码以进行更新(更新方法),则应用程序运行正确,我希望我能得到答案,我非常感谢。
另一个问题是:如何让我的动画看起来更流畅,因为它会停顿几分之一秒然后再次移动。
这是我的代码:
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
public class animation extends Application {
AnchorPane root = new AnchorPane();
//create a matrix from rectangle class to stock 5 rectangle objects
rectangle rect [] = new rectangle [5];
//isMoving gets the true value when the animation starts
private boolean isMoving = false;
private int traveledDistance = 30;
@Override
public void start(Stage primaryStage) {
//add 5 rectangles on the anchorpane
//rect[0], rect[2] and rect[4] have BURLYWOOD color
//rect[1], rect[3] have DARKBLUE color
for(int i = 0; i<5; i++)
{
if(i%2 == 0)
{
rect[i] = new rectangle();
rect[i].setFill(Color.BURLYWOOD);
}
else
{
rect[i] = new rectangle();
rect[i].setFill(Color.DARKBLUE);
}
//set all 5 rectangles as empty
rect[i].setRectEmpty(true);
//set all the 5 rectangles one after the other along the x axis
rect[i].setTranslateX(i*60);
//add the 5 rectangles to the parent
root.getChildren().add(rect[i]);
}
//instantiation of two circles (c and d) from cirlce class
circle c = new circle(Color.RED);
c.setName("redCircle");
circle d = new circle(Color.BLUE);
d.setName("blueCircle");
//set the position of the red circle centered relatively to rect[0]
//rect[0] is no longer empty as it contains the red circle
c.setTranslateX(30);
c.setTranslateY(30);
rect[0].setCircle(c);
rect[0].setCircleName(c.getName());
rect[0].setRectEmpty(false);
root.getChildren().add(c);
//set the position of the blue circle centered relatively to rect[4]
d.setTranslateX(4*60 +30);
d.setTranslateY(30);
rect[4].setCircle(d);
rect[4].setCircleName(d.getName());
root.getChildren().add(d);
displayedScene(primaryStage);
//when the parent is clicked
root.setOnMousePressed(new EventHandler<MouseEvent>(){
@Override
public void handle(MouseEvent event) {
//get the index of the clicked rectangle
int index = (int) event.getX()/60;
//if the clicked rectangle contains the red circle inside
if(!rect[index].isRectEmpty() && rect[index].getCircleName().equals("redCircle"))
{
Circle circle = rect[index].getCircle();
//update the postion of the red circle so that it occupies the last rectangle (rect[4])
update(index,5, circle);
//update the position of the blue circle so that it occupies the first rectangle(rect[0])
update(5,0, rect[4].getCircle());
}
}
});
}
//update method uses the AnimationTimer class
public void update(int initialPos, int lastPos, Circle circle)
{
AnimationTimer timer = new AnimationTimer() {
@Override
public void handle(long now) {
updateCirclePosition(initialPos, lastPos, circle);
if(!isMoving)
{
this.stop();
}
}
};
timer.start();
}
public void updateCirclePosition(int initialPos, int lastPos, Circle circle)
{
int dx = 2;
if(initialPos>lastPos)
{
dx = -1*dx;
}
isMoving = true;
int distance = Math.abs((lastPos - initialPos)*60);
if(traveledDistance<distance-30)
{
circle.setTranslateX(circle.getTranslateX() + dx);
traveledDistance +=Math.abs(dx);
}
else{
isMoving = false;
traveledDistance = 30;
}
}
//load the Stage
public void displayedScene(Stage primaryStage)
{
Scene scene = new Scene(root, 300, 60);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
// circle class extends Circle
public class circle extends Circle
{
private String name;
public circle(Paint color) {
super(30, color);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
}
这里是矩形类:
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
//rectangle class extends Rectangle
public class rectangle extends Rectangle {
private Circle circle;
private String circleName;
private boolean rectEmpty;
public rectangle() {
super(60, 60);
}
public Circle getCircle() {
return circle;
}
public void setCircle(Circle circle) {
this.circle = circle;
}
public boolean isRectEmpty() {
return rectEmpty;
}
public void setRectEmpty(boolean rectEmpty) {
this.rectEmpty = rectEmpty;
}
public String getCircleName() {
return circleName;
}
public void setCircleName(String circleName) {
this.circleName = circleName;
}
}
【问题讨论】:
-
这听起来像
Timeline会更合适;只需添加适当的关键帧。但是您也可以想办法在停止第一个动画计时器时进行第二次更新调用。 -
在
SequentialTransition中使用两个TranslateTransition似乎就是您想要的。 -
请使用java命名约定