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Zen Pong Game
/*
* Copyright (c) 2011, Pro JavaFX Authors
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of JFXtras nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ZenPongMain.java - A simple example of the intersects function and
* event handlers to create a very basic Pong game.
*
*
* Developed 2011 by James L. Weaver jim.weaver [at] javafxpert.com
* as a JavaFX SDK 2.0 example for the Pro JavaFX book.
*/
//package projavafx.zenpong.ui;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.animation.TimelineBuilder;
import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Cursor;
import javafx.scene.Group;
import javafx.scene.GroupBuilder;
import javafx.scene.Scene;
import javafx.scene.SceneBuilder;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonBuilder;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.LinearGradientBuilder;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Circle;
import javafx.scene.shape.CircleBuilder;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.RectangleBuilder;
import javafx.stage.Stage;
import javafx.util.Duration;
/**
* Main class for the ZenPong example
*/
public class Main extends Application {
/**
* The center points of the moving ball
*/
DoubleProperty centerX = new SimpleDoubleProperty();
DoubleProperty centerY = new SimpleDoubleProperty();
/**
* The Y coordinate of the left paddle
*/
DoubleProperty leftPaddleY = new SimpleDoubleProperty();
/**
* The Y coordinate of the right paddle
*/
DoubleProperty rightPaddleY = new SimpleDoubleProperty();
/**
* The drag anchor for left and right paddles
*/
double leftPaddleDragAnchorY;
double rightPaddleDragAnchorY;
/**
* The initial translateY property for the left and right paddles
*/
double initLeftPaddleTranslateY;
double initRightPaddleTranslateY;
/**
* The moving ball
*/
Circle ball;
/**
* The Group containing all of the walls, paddles, and ball. This also allows
* us to requestFocus for KeyEvents on the Group
*/
Group pongComponents;
/**
* The left and right paddles
*/
Rectangle leftPaddle;
Rectangle rightPaddle;
/**
* The walls
*/
Rectangle topWall;
Rectangle rightWall;
Rectangle leftWall;
Rectangle bottomWall;
Button startButton;
/**
* Controls whether the startButton is visible
*/
BooleanProperty startVisible = new SimpleBooleanProperty(true);
/**
* The animation of the ball
*/
Timeline pongAnimation = TimelineBuilder.create()
.keyFrames(
new KeyFrame(
new Duration(10.0),
new EventHandler<ActionEvent>() {
public void handle(javafx.event.ActionEvent t) {
checkForCollision();
int horzPixels = movingRight ? 1 : -1;
int vertPixels = movingDown ? 1 : -1;
centerX.setValue(centerX.getValue() + horzPixels);
centerY.setValue(centerY.getValue() + vertPixels);
}
}
)
)
.cycleCount(Timeline.INDEFINITE)
.build();
/**
* Controls whether the ball is moving right
*/
boolean movingRight = true;
/**
* Controls whether the ball is moving down
*/
boolean movingDown = true;
/**
* Sets the initial starting positions of the ball and paddles
*/
void initialize() {
centerX.setValue(250);
centerY.setValue(250);
leftPaddleY.setValue(235);
rightPaddleY.setValue(235);
startVisible.set(true);
pongComponents.requestFocus();
}
/**
* Checks whether or not the ball has collided with either the paddles,
* topWall, or bottomWall. If the ball hits the wall behind the paddles,
* the game is over.
*/
void checkForCollision() {
if (ball.intersects(rightWall.getBoundsInLocal()) ||
ball.intersects(leftWall.getBoundsInLocal())) {
pongAnimation.stop();
initialize();
}
else if (ball.intersects(bottomWall.getBoundsInLocal()) ||
ball.intersects(topWall.getBoundsInLocal())) {
movingDown = !movingDown;
}
else if (ball.intersects(leftPaddle.getBoundsInParent()) && !movingRight) {
movingRight = !movingRight;
}
else if (ball.intersects(rightPaddle.getBoundsInParent()) && movingRight) {
movingRight = !movingRight;
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Application.launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = SceneBuilder.create()
.width(500)
.height(500)
.fill(
LinearGradientBuilder.create()
.startX(0.0)
.startY(0.0)
.endX(0.0)
.endY(1.0)
.stops(
new Stop(0.0, Color.BLACK),
new Stop(0.0, Color.GRAY)
)
.build()
)
.root(
pongComponents = GroupBuilder.create()
.focusTraversable(true)
.children(
ball = CircleBuilder.create()
.radius(5.0)
.fill(Color.WHITE)
.build(),
topWall = RectangleBuilder.create()
.x(0)
.y(0)
.width(500)
.height(1)
.build(),
leftWall = RectangleBuilder.create()
.x(0)
.y(0)
.width(1)
.height(500)
.build(),
rightWall = RectangleBuilder.create()
.x(500)
.y(0)
.width(1)
.height(500)
.build(),
bottomWall = RectangleBuilder.create()
.x(0)
.y(500)
.width(500)
.height(1)
.build(),
leftPaddle = RectangleBuilder.create()
.x(20)
.width(10)
.height(30)
.fill(Color.LIGHTBLUE)
.cursor(Cursor.HAND)
.onMousePressed(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
initLeftPaddleTranslateY = leftPaddle.getTranslateY();
leftPaddleDragAnchorY = me.getSceneY();
}
})
.onMouseDragged(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
double dragY = me.getSceneY() - leftPaddleDragAnchorY;
leftPaddleY.setValue(initLeftPaddleTranslateY + dragY);
}
})
.build(),
rightPaddle = RectangleBuilder.create()
.x(470)
.width(10)
.height(30)
.fill(Color.LIGHTBLUE)
.cursor(Cursor.HAND)
.onMousePressed(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
initRightPaddleTranslateY = rightPaddle.getTranslateY();
rightPaddleDragAnchorY = me.getSceneY();
}
})
.onMouseDragged(new EventHandler<MouseEvent>() {
public void handle(MouseEvent me) {
double dragY = me.getSceneY() - rightPaddleDragAnchorY;
rightPaddleY.setValue(initRightPaddleTranslateY + dragY);
}
})
.build(),
startButton = ButtonBuilder.create()
.layoutX(225)
.layoutY(470)
.text("Start!")
.onAction(new EventHandler<javafx.event.ActionEvent>() {
@Override public void handle(javafx.event.ActionEvent e) {
startVisible.set(false);
pongAnimation.playFromStart();
pongComponents.requestFocus();
}
})
.build()
)
.onKeyPressed(new EventHandler<KeyEvent>() {
@Override public void handle(KeyEvent k) {
if (k.getCode() == KeyCode.SPACE &&
pongAnimation.statusProperty()
.equals(Animation.Status.STOPPED)) {
rightPaddleY.setValue(rightPaddleY.getValue() - 6);
}
else if (k.getCode() == KeyCode.L &&
!rightPaddle.getBoundsInParent().intersects(topWall.getBoundsInLocal())) {
rightPaddleY.setValue(rightPaddleY.getValue() - 6);
}
else if (k.getCode() == KeyCode.COMMA &&
!rightPaddle.getBoundsInParent().intersects(bottomWall.getBoundsInLocal())) {
rightPaddleY.setValue(rightPaddleY.getValue() + 6);
}
else if (k.getCode() == KeyCode.A &&
!leftPaddle.getBoundsInParent().intersects(topWall.getBoundsInLocal())) {
leftPaddleY.setValue(leftPaddleY.getValue() - 6);
}
else if (k.getCode() == KeyCode.Z &&
!leftPaddle.getBoundsInParent().intersects(bottomWall.getBoundsInLocal())) {
leftPaddleY.setValue(leftPaddleY.getValue() + 6);
}
}
})
.build()
)
.build();
ball.centerXProperty().bind(centerX);
ball.centerYProperty().bind(centerY);
leftPaddle.translateYProperty().bind(leftPaddleY);
rightPaddle.translateYProperty().bind(rightPaddleY);
startButton.visibleProperty().bind(startVisible);
stage.setScene(scene);
initialize();
stage.setTitle("ZenPong Example");
stage.show();
}
}
