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Also ich versuche, Snake auf einem JFrame zu programmieren und alle grafischen Sachen (Bewegen der "Schlange", zufällige Lebensmittelgeneration usw.) auf einem JPanel. Ich bin am Anfang, also versuche ich gerade ein schwarzes Quadrat mit den Pfeiltasten auf meinem Rahmen zu bewegen. Meine while-Schleife in der Panel-Klasse wird nicht durch einen Tastendruck in der Snake-Klasse unterbrochen. Gibt es also eine Möglichkeit, JPanel-Grafiken aus derselben Klasse mit all meinem anderen Code zu bearbeiten?Wie kann ich JPanel Graphics in einer Klasse bearbeiten?
Hier ist der gesamte Code. Meine Panel-Klasse am Ende folgt der Vorlage, die ich hier gefunden habe.
public class Snake {
// panel width and height
static int pW;
static int pH;
static int x = 10;
static int y = 10;
static int k;
static JFrame frame = new JFrame("SNAKE");
// getters for panel class
public int getPW() { return pW; }
public int getPH() { return pH; }
public int getX() { return x; }
public int getY() { return y; }
public static void main(String[] args) {
// get screen dimensions
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int sH = (int) screenSize.getHeight();
int sW = (int) screenSize.getWidth();
pW = (int) sW/2;
pH = (int) sH/2;
// initialize frame
frame.setSize (pW/1,pH/1);
frame.setLocation(pW/2,pH/2);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
k = e.getKeyCode();
switch(k) {
case 38: /* y -= square size */ break; // up
case 40: /* y += square size */ break; // down
case 37: /* x -= square size */ break; // left
case 39: /* x += square size */ break; // right
case 27: System.exit(0);
}
}
});
Panel panel = new Panel();
frame.add(panel);
frame.setVisible(true);
}
}
class Panel extends JPanel {
Snake snake = new Snake();
//square size and separation between squares
int sep = 0;
int size = 50;
// initial location of square on the panel/frame
int x = sep + size;
int y = sep + size;
// holding values to check if x or y have changed
int xH = x;
int yH = x;
public void paint(Graphics g) {
int pW = snake.getPW();
int pH = snake.getPH();
int i; int o;
Color on = Color.BLACK;
Color off = Color.GRAY;
// gray background
g.setColor(Color.GRAY);
g.fillRect(0,0,pW,pH);
// black square initialization
g.setColor(Color.BLACK);
g.fillRect(x, y, size, size);
/* this loop is supposed to check if the black
* rectangle has moved by repeatedly grabbing x & y
* values from the Snake class. When a key is pressed
* and the values change, a gray rectangle is placed at the old location
* and a black one is placed at the new location.
*
* When I run the program, I get stuck in this while loop.
* If I had the while loop in the same class I check for keys,
* I don't think I would have this problem
*/
while(true) {
x = snake.getX();
y = snake.getY();
if(x != xH || y != yH) {
g.setColor(off);
g.fillRect(xH, yH, size, size);
g.setColor(on);
g.fillRect(snake.getX(), snake.getY(), size, size);
xH = x;
yH = y;
}}
}
}