How to change the direction of a moving object

Question

I am trying to make a connect four program for class, and i am trying to make it so the red check piece move down. But instead it move left n right -.-, ive tried changing the coordinates but then the piece would just spin in circle or spins out of control. Here is the code i have right now, can someone help me please =D .
import java.awt.*;*
*public class Circle{*
*private int centerX, centerY, radius;*
*private Color color;*
*private int direction, velocity;*
*private boolean filled;*
*public Circle(int x, int y, int r, Color c){*
*centerX = x;*
*centerY = y;*
*radius = r;*
*color = c;*
*direction = 0;*
*velocity = 0;*
*filled = false;*
*public void draw(Graphics g){*
*Color oldColor = g.getColor();*
*g.setColor(color);*
*// Translates circle's center to rectangle's origin for drawing.*
*if (filled)*
*g.fillOval(centerX - radius, centerY - radius, radius*  2, radius  *2);*
*else*
*g.drawOval(centerX - radius, centerY - radius, radius*  2, radius  *2);*
*g.setColor(oldColor);*
*public void fill(Graphics g){*
*Color oldColor = g.getColor();*
*g.setColor(color);*
*// Translates circle's center to rectangle's origin for drawing.*
*g.fillOval(centerX - radius, centerY - radius, radius*  2, radius  *2);*
*g.setColor(oldColor);*
*public boolean containsPoint(int x, int y){*
*int xSquared = (x - centerX)*  (x - centerX);
int ySquared = (y - centerY)  *(y - centerY);*
*int radiusSquared = radius*  radius;
return xSquared  +ySquared - radiusSquared <= 0;+
+}+
+public void move(int xAmount, int yAmount){+
+centerX = centerX+  xAmount;
centerY = centerY  +yAmount;+
+}+
+public int getRadius(){+
+return radius;+
+}+
+public int getX(){+
+return centerX;+
+}+
+public int getY(){+
+return centerY;+
+}+
+public void setVelocity(int v){+
+velocity = v;+
+}+  
+public void setDirection(int d){+
+direction = d % 360;+
+}+
+public void turn(int degrees){+
+direction = (direction+  degrees) % 360;
// Moves the circle in the current direction using its
// current velocity
public void move(){
move((int)(velocity  *Math.cos(Math.toRadians(direction))),*
*(int)(velocity*  Math.sin(Math.toRadians(direction))));
public void setFilled(boolean b){
filled = b;
import javax.swing.*;*
*import java.awt.*;
import java.awt.event.*;
public class ColorPanel extends JPanel{
private Circle circle;
private javax.swing.Timer timer;
public ColorPanel(Color backColor, int width, int height){
setBackground(backColor);
setPreferredSize(new Dimension(width, height));
// Circle with center point (25, 100) and radius 25
circle = new Circle(25, height / 2, 25, Color.red);
circle.setFilled(true);
// Aim due west to hit left boundary first
circle.setDirection(90);
// Move 5 pixels per unit of time
circle.setVelocity(5);
// Move every 5 milliseconds
timer = new javax.swing.Timer(5, new MoveListener());
timer.start();
public void paintComponent(Graphics g){
super.paintComponent(g);
circle.fill(g);     
private class MoveListener implements ActionListener{
public void actionPerformed(ActionEvent e){
int x = circle.getX();
int radius = circle.getRadius();
int width = getWidth();
// Check for boundaries and reverse direction
// if necessary
if (x - radius <= 0 || x + radius >= width)
circle.turn(90);
circle.move();
repaint();
}with that code my circle just spins back n forth rapidly. How can i make it so it drop to a certain location everytime i click the mouse?

Answer 1

lilkenny1337 wrote:
I am trying to make a connect four program for class, and i am trying to make it so the red check piece move down.
How can i make it so it drop to a certain location everytime i click the mouse?Try this:
public class ColorPanel extends JPanel {
    private Circle circle;
    private Timer timer;
    private int stepX, stepY, xM, yM;
    public ColorPanel(final Color backColor, final int width, final int height) {
        setBackground(backColor);
        setPreferredSize(new Dimension(width, height));
        // Circle with center point (25, 100) and radius 25
        circle = new Circle(25, height / 2, 25, Color.red);
        circle.setFilled(true);
        // Aim due west to hit left boundary first
        circle.setDirection(90);
        // Move 5 pixels per unit of time
        circle.setVelocity(5);
        // Move every 5 milliseconds
        final MoveListener ml = new MoveListener();
        timer = new Timer(5, ml);
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(final MouseEvent e) {
                if (timer.isRunning()) {
                    return;
                xM = e.getX();
                yM = e.getY();
                int xC = circle.getX();
                int yC = circle.getY();
                stepX = (xM - xC) / 10;
                stepY = (yM - yC) / 10;
                timer.start();
    @Override
    public void paintComponent(final Graphics g) {
        super.paintComponent(g);
        circle.fill(g);
    private class MoveListener implements ActionListener {
        public void actionPerformed(final ActionEvent e) {
            if ((stepX > 0 && circle.getX() >= xM)
                    || (stepX < 0 && circle.getX() <= xM)) {
                stepX = 0;
            if ((stepY > 0 && circle.getY() >= yM)
                    || (stepY < 0 && circle.getY() <= yM)) {
                stepY = 0;
            if (stepX == 0 && stepY == 0) {
                timer.stop();
                circle.setLocation(xM, yM);
/* add this method in the class "Circle":
    public void setLocation(int xM, int yM) {
        centerX = xM;
        centerY = yM;
            } else {
                circle.move(stepX, stepY);
            repaint();
}