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Commit c9d8f95

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32 ex 2 add javadoc description
1 parent 9b42e03 commit c9d8f95

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‎ch_32/Exercise32_02.java‎

Lines changed: 122 additions & 114 deletions
Original file line numberDiff line numberDiff line change
@@ -11,124 +11,132 @@
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import javafx.scene.shape.Rectangle;
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import javafx.stage.Stage;
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/**
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* **32.2 (Visualize data) Write a program that displays the number of students in each
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* department in a pie chart and a bar chart, as shown in Figure 32.27b. The number
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* of students for each department can be obtained from the Student table (see
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* Figure 32.4) using the following SQL statement:
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* select deptId, count(*)
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* from Student
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* where deptId is not null
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* group by deptId;
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*/
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public class Exercise32_02 extends Application {
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@Override
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public void start(Stage primaryStage) {
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CarPane car = new CarPane();
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Scene scene = new Scene(car, 200, 200);
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primaryStage.setTitle(getClass().getName());
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primaryStage.setScene(scene);
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primaryStage.show();
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scene.widthProperty().addListener(e -> car.setW(car.getWidth()));
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scene.heightProperty().addListener(e -> car.setH(car.getHeight()));
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car.setOnMousePressed(e -> car.suspend());
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car.setOnMouseReleased(e -> car.resume());
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car.requestFocus();
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car.setOnKeyPressed(e -> {
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if (e.getCode() == KeyCode.UP) {
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car.faster();
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}
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else if (e.getCode() == KeyCode.DOWN) {
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car.slower();
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}
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});
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}
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@Override
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public void start(Stage primaryStage) {
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CarPane car = new CarPane();
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Scene scene = new Scene(car, 200, 200);
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primaryStage.setTitle(getClass().getName());
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primaryStage.setScene(scene);
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primaryStage.show();
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scene.widthProperty().addListener(e -> car.setW(car.getWidth()));
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scene.heightProperty().addListener(e -> car.setH(car.getHeight()));
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car.setOnMousePressed(e -> car.suspend());
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car.setOnMouseReleased(e -> car.resume());
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/**
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* The main method is only needed for the IDE with limited
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* JavaFX support. Not needed for running from the command line.
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*/
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public static void main(String[] args) {
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launch(args);
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}
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}
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car.requestFocus();
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car.setOnKeyPressed(e -> {
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if (e.getCode() == KeyCode.UP) {
43+
car.faster();
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} else if (e.getCode() == KeyCode.DOWN) {
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car.slower();
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}
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});
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}
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/**
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* The main method is only needed for the IDE with limited
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* JavaFX support. Not needed for running from the command line.
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*/
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public static void main(String[] args) {
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launch(args);
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}
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}
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class CarPane extends Pane {
51-
private double w = 200;
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private double h = 200;
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private double baseX = 0;
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private double baseY = h;
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private Circle c1 = new Circle(baseX + 10 + 5, baseY - 10 + 5, 5);
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private Circle c2 = new Circle(baseX + 30 + 5, baseY - 10 + 5, 5);
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private Rectangle carBody = new Rectangle(baseX, baseY - 20, 50, 10);
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private Polygon carTop = new Polygon(baseX + 10, baseY - 20,
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baseX + 20, baseY - 30, baseX + 30, baseY - 30,
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baseX + 40, baseY - 20);
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private int sleepTime = 50;
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private Thread thread = new Thread(() -> {
65-
try {
66-
while (true) {
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Platform.runLater(() -> move());
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Thread.sleep(sleepTime);
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}
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private double w = 200;
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private double h = 200;
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private double baseX = 0;
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private double baseY = h;
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private Circle c1 = new Circle(baseX + 10 + 5, baseY - 10 + 5, 5);
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private Circle c2 = new Circle(baseX + 30 + 5, baseY - 10 + 5, 5);
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private Rectangle carBody = new Rectangle(baseX, baseY - 20, 50, 10);
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private Polygon carTop = new Polygon(baseX + 10, baseY - 20,
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baseX + 20, baseY - 30, baseX + 30, baseY - 30,
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baseX + 40, baseY - 20);
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private int sleepTime = 50;
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private Thread thread = new Thread(() -> {
74+
try {
75+
while (true) {
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Platform.runLater(() -> move());
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Thread.sleep(sleepTime);
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}
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} catch (InterruptedException ex) {
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}
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});
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public CarPane() {
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carBody.setFill(Color.GREEN);
85+
carTop.setFill(Color.RED);
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this.getChildren().addAll(c1, c2, carBody, carTop);
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thread.start();
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}
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public void suspend() {
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thread.suspend();
7093
}
71-
catch (InterruptedException ex) {
94+
95+
public void resume() {
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thread.resume();
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}
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public void faster() {
100+
if (sleepTime > 1)
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sleepTime--;
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}
103+
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public void slower() {
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sleepTime++;
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}
107+
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public void move() {
109+
if (baseX > w)
110+
baseX = -20;
111+
else
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baseX += 1;
113+
114+
setValues();
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}
116+
117+
public void setValues() {
118+
c1.setCenterX(baseX + 10 + 5);
119+
c1.setCenterY(baseY - 10 + 5);
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c2.setCenterX(baseX + 30 + 5);
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c2.setCenterY(baseY - 10 + 5);
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123+
carBody.setX(baseX);
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carBody.setY(baseY - 20);
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carTop.getPoints().clear();
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carTop.getPoints().addAll(baseX + 10, baseY - 20,
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baseX + 20, baseY - 30, baseX + 30, baseY - 30,
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baseX + 40, baseY - 20);
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}
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132+
public void setW(double w) {
133+
this.w = w;
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setValues();
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}
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public void setH(double h) {
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this.h = h;
139+
baseY = h;
140+
setValues();
72141
}
73-
});
74-
75-
public CarPane() {
76-
carBody.setFill(Color.GREEN);
77-
carTop.setFill(Color.RED);
78-
this.getChildren().addAll(c1, c2, carBody, carTop);
79-
80-
thread.start();
81-
}
82-
83-
public void suspend() {
84-
thread.suspend();
85-
}
86-
87-
public void resume() {
88-
thread.resume();
89-
}
90-
91-
public void faster() {
92-
if (sleepTime > 1)
93-
sleepTime--;
94-
}
95-
96-
public void slower() {
97-
sleepTime++;
98-
}
99-
100-
public void move() {
101-
if (baseX > w)
102-
baseX = -20;
103-
else
104-
baseX += 1;
105-
106-
setValues();
107-
}
108-
109-
public void setValues() {
110-
c1.setCenterX(baseX + 10 + 5);
111-
c1.setCenterY(baseY - 10 + 5);
112-
c2.setCenterX(baseX + 30 + 5);
113-
c2.setCenterY(baseY - 10 + 5);
114-
115-
carBody.setX(baseX);
116-
carBody.setY(baseY - 20);
117-
118-
carTop.getPoints().clear();
119-
carTop.getPoints().addAll(baseX + 10, baseY - 20,
120-
baseX + 20, baseY - 30, baseX + 30, baseY - 30,
121-
baseX + 40, baseY - 20);
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}
123-
124-
public void setW(double w) {
125-
this.w = w;
126-
setValues();
127-
}
128-
129-
public void setH(double h) {
130-
this.h = h;
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baseY = h;
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setValues();
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}
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}

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