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[英]How can I dynamically change the speed of a JavaFX AnimationTimer with a Slider?
[英]How can I get specific fields from an AnimationTimer object?
我已經編寫了一個簡單的游戲,使用 JavaFX 作為 GUI 和 AnimationTimer 作為游戲本身,但我發現在 AnimationTimer 對象內更新的任何字段都無法在對象之外找到。 我已經設法連續記錄游戲運行的時間以及該游戲的得分,但找不到從 AnimationTimer 對象中獲取這些值的方法,以便我可以將它們添加到我的 GUI 中。
我已經嘗試過 java.lang.Reflect,但我似乎無法讓它工作。
AnimationTimer animations = new AnimationTimer() //creates animations
{
@Override
public void handle(long now)
{
//update frames
if(jump == 0) //moves the player model to the starting position
{
playerY = 160;
}
else if(jump == 1) //moves the player model up (jumping)
{
playerY = 100;
}
if(shout == 1) //makes player immune while "shouting"
{
player.setFill(Color.GREEN);
}
if(shout == 0) //makes player not immune anymore
player.setFill(Color.BLUE);
if(obstacleX == PLAYER_X) //updates the score
{
points += 10;
score.setText("Score: " + String.valueOf(points));
}
if(player.getBoundsInParent().intersects(obstacle.getBoundsInParent())) //detects if the player model touches an obstacles
{
if(obstacle.getEndY() == 0)
{
if(player.getFill() == Color.BLUE)
player.setFill(Color.RED);
}
else if(obstacle.getEndY() == 130)
player.setFill(Color.RED);
}
if(obstacleX > 0) //moves the obstacles' reference point from the right to the left
obstacleX -= 5;
if(obstacleX == 0)
{
obstacleX = 400;
int[] array = new int[]{0, 0, 130};
Random randomNum = new Random();
int i = randomNum.nextInt(array.length);
random = array[i];
obstacle.setEndY(random);
}
//render frames
player.setCenterY(playerY);
obstacle.setStartX(obstacleX); //this and line 110 move the obstacle across the scene
obstacle.setEndX(obstacleX);
try{ //exception handler for outputs
if(player.getFill() == Color.GREEN)
{
digitalOutput6.setDutyCycle(1); //turns on green LED
digitalOutput0.setDutyCycle(0);
}
if(player.getFill() == Color.BLUE)
{
digitalOutput6.setDutyCycle(0); //turns off LEDs
digitalOutput0.setDutyCycle(0);
}
if(player.getFill() == Color.RED) //stops the animation when the player model reacts to touching an obstacle
{
endTime = System.currentTimeMillis() - startTime;
finalScore = score.getText();
this.stop(); //ends game
gameOver = 1;
digitalOutput0.setDutyCycle(1); //turns on red LED
digitalOutput6.setDutyCycle(0);
gameStage.setScene(gameEnd); //establishing scene
gameStage.setTitle("Game Over");
gameStage.show();
}
} //end of try block
catch(PhidgetException e)
{
System.out.println("Phidget Output Error");
}
} //end of animation handle itself
}; //end of animation method
我嘗試使用
long finalTime = animations.getLong(endTime);
和
String endScore = animations.getField(finalScore);
但沒有運氣。 任何幫助表示贊賞。
AnimationTimer
本身不公開任何屬性,創建一個包含AnimationTimer
對象的自定義類,並保存您想要訪問的任何屬性。
當您初始化自定義類時,初始化AnimationTimer
對象並覆蓋該函數(如您所做的那樣),還會更新您想要公開的任何屬性。
我對 javafx 不熟悉,可能還有其他更好的方法,這是我能想到的一種快速解決方案。
進行了快速搜索,這些示例可能會有所幫助:
https://netopy.com/2012/06/14/using-the-javafx-animationtimer/
https://tbeernot.wordpress.com/2011/11/12/javafx-2-0-bubblemark/
首先不要在匿名類上使用反射它會工作,但會導致很多低效率和臟代碼。 其次,您嘗試訪問句柄(現在很長時間)的方法范圍內而不是類范圍內的字段。
AnimationTimer t = new AnimationTimer() {
int fieldInt = 0; // would be accessible
@Override
public void handle(long now) {
//do something
}
};
AnimationTimer t = new AnimationTimer() {
@Override
public void handle(long now) {
int fieldInt = 0; // is not accessible as regular field
//do something
}
};
您可以執行以下操作:
使用擴展 Animationtimer 的類
public class Scheduler extends AnimationTimer{
private int gameEnd = 42;
private String someValue = "hello";
@Override
public void handle(long now) {
gameEnd += 1;
if(gameEnd >= 1000000) {
someValue ="Bye bye";
}
}
public String getSomeValue() {
return someValue;
}
在這里你可以使用:
Scheduler s = new Scheduler();
s.start();
//whatever you want to do
System.out.Println(s.getSomeValue());
或者當您想使用匿名類方法時,您應該創建一個位於 AnimationTimer 之外的屬性並使用它。 (這是我更喜歡的事情,因為您可以在屬性上有一個 changeListener 並在值更改時接收回調)
public void whateverMethod() {
SimpleIntegerProperty gameEndProp = new SimpleIntegerProperty(42);
AnimationTimer t = new AnimationTimer() {
@Override
public void handle(long now) {
gameEndProp.set(gameEndProp.get()+1);
}
};
t.start();
//Do something
System.out.println(gameEndProp.get());
}
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