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Prova

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This commit is contained in:
Vichingo455
2025-11-13 09:26:45 +01:00
parent 3054032532
commit cc9f2f7ebf
6 changed files with 215 additions and 0 deletions
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Prova1/.gitignore vendored Normal file
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### IntelliJ IDEA ###
out/
!**/src/main/**/out/
!**/src/test/**/out/
.kotlin
### Eclipse ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
bin/
!**/src/main/**/bin/
!**/src/test/**/bin/
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
### VS Code ###
.vscode/
### Mac OS ###
.DS_Store

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Prova1/.idea/.gitignore generated vendored Normal file
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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

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Prova1/.idea/misc.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>

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Prova1/.idea/modules.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/Prova1.iml" filepath="$PROJECT_DIR$/Prova1.iml" />
</modules>
</component>
</project>

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Prova1/Prova1.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

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Prova1/src/CirclePanelDemo.java Normal file
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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class CirclePanelDemo {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new CirclePanelDemo().createAndShowGUI());
}
/* ----------------------------- */
/* 1. Finestra principale */
/* ----------------------------- */
private void createAndShowGUI() {
JFrame frame = new JFrame("Circle – click, drag & delete");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
CirclePanel circlePanel = new CirclePanel();
frame.add(circlePanel, BorderLayout.CENTER);
JButton clearBtn = new JButton("Cancella cerchio");
clearBtn.addActionListener(e -> circlePanel.clearCircle());
JPanel btnPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
btnPanel.add(clearBtn);
frame.add(btnPanel, BorderLayout.SOUTH);
frame.setSize(600, 400);
frame.setLocationRelativeTo(null); // centra la finestra
frame.setVisible(true);
}
/* ----------------------------- */
/* 2. JPanel che disegna il cerchio */
/* ----------------------------- */
private static class CirclePanel extends JPanel {
private final int RADIUS = 30; // raggio fisso
private int circleX = -1; // centro X (-1 → nessun cerchio)
private int circleY = -1; // centro Y
/* variabili per il drag */
private boolean dragging = false;
private int offsetX, offsetY;
CirclePanel() {
setBackground(Color.WHITE);
MouseAdapter ma = new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
int mx = e.getX();
int my = e.getY();
/* Se il cerchio esiste */
if (circleX != -1 && circleY != -1) {
/* Se il click è dentro il cerchio → inizia drag */
if (isInsideCircle(mx, my)) {
dragging = true;
offsetX = mx - circleX;
offsetY = my - circleY;
} else {
// Click fuori dal cerchio: non fare nulla
dragging = false;
}
} else {
/* Nessun cerchio → creiamo un nuovo */
setCircle(mx, my);
}
}
@Override
public void mouseReleased(MouseEvent e) {
dragging = false;
}
@Override
public void mouseDragged(MouseEvent e) {
if (dragging && circleX != -1) {
int mx = e.getX();
int my = e.getY();
setCircle(mx - offsetX, my - offsetY);
}
}
};
addMouseListener(ma);
addMouseMotionListener(ma);
}
/* ---------------------------------- */
/* 3. Utilità */
/* ---------------------------------- */
/** Verifica se il punto (x,y) è dentro il cerchio */
private boolean isInsideCircle(int x, int y) {
if (circleX == -1 || circleY == -1) return false;
int dx = x - circleX;
int dy = y - circleY;
return dx * dx + dy * dy <= RADIUS * RADIUS;
}
/** Imposta il centro del cerchio e ridisegna */
private void setCircle(int x, int y) {
circleX = x;
circleY = y;
repaint();
}
/** Cancella il cerchio (se presente) */
public void clearCircle() {
circleX = -1;
circleY = -1;
repaint();
}
/* ---------------------------------- */
/* 4. Disegno del pannello */
/* ---------------------------------- */
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (circleX == -1 || circleY == -1)
return; // nessun cerchio da disegnare
Graphics2D g2 = (Graphics2D) g.create();
try {
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int topLeftX = circleX - RADIUS;
int topLeftY = circleY - RADIUS;
g2.setColor(Color.RED);
g2.fillOval(topLeftX, topLeftY, 2 * RADIUS, 2 * RADIUS);
// bordo bianco
g2.setStroke(new BasicStroke(2f));
g2.setColor(Color.WHITE);
g2.drawOval(topLeftX, topLeftY, 2 * RADIUS, 2 * RADIUS);
} finally {
g2.dispose();
}
}
}
}