我使用java applet编写了一些代码，我想把它变成一个带有一些滑块控件的java swing应用程序中的面板。我应该把它放在JApplet或JPanel或其他东西？我糊涂了。帮助赞赏。
import java.applet.*;
import java.util.ArrayList;
import java.awt.*;
import java.util.Random;
public class BallParticle extends Applet implements Runnable {
private ArrayList<Ball> ballArr = new ArrayList<Ball>();
private static int refreshBackground = 1,//1 = refresh, 0 = don't refresh
runSpeed = 40; // ~ 25 Hz
private static String state="p"; //"s"=spiral, "p"=particle
public void init() {
setSize(600, 500);
}
public void start() {
Thread th = new Thread(this);
th.start();
}
public void run() {
while (true) {
for (Ball ball: ballArr)
ball.move();
repaint();
try {
Thread.sleep(runSpeed);
} catch (InterruptedException e) {
}
}
}
@Override
public void update(Graphics g) {
//clear screen in background
if (refreshBackground == 1) {
Image img1 = createImage(this.getSize().width, this.getSize().height);
Graphics g1 = img1.getGraphics();
g1.setColor(getBackground());
paint(g1);
g.drawImage(img1, 0, 0, this);
}
//draw image on the screen
paint(g);
}
public void paint(Graphics g) {
for (Ball b: ballArr){
g.setColor(b.getColor());
g.fillOval(b.getXCoor(),b.getYCoor(),b.getSize(),b.getSize());
}
}
int i = 0;
public boolean mouseDown(Event e, int centerX, int centerY) {
ballArr.add(new Ball(centerX, centerY, "p"));
return true;
}
}
//////////////////////////////////////////////////////////////////////////////
class Ball{
//////////////////////////////////////////////////////////////////////////
private static int instanceCount; {{instanceCount++;}}
private int z = 11, t=1, u=1;
private int[] RGB = new int[3];
private int[] randomizeColor = new int[3];
private double radius, theta;
private int x, y, centerX, centerY, size, spiralDirection=1,
ballSizeLowerBound, ballSizeUpperBound,
radiusLowerBound, radiusUpperBound,
mouseInputX, mouseInputY,
radiusXMultiplier, radiusYMultiplier;
private Color color;
private String state;
private Random random = new Random();
///////////////////////////////////////////////////////////////////////////
public Ball(int x, int y, int centerX, int centerY, int radius,
int theta, int size, Color color){
this.x=x;this.y=y;this.centerX=centerX;this.centerY=centerY;
this.radius=radius;this.theta=theta;this.size=size;this.color=color;
}
public Ball(int mouseInputX, int mouseInputY, String state){
this.mouseInputX=mouseInputX;
this.mouseInputY=mouseInputY;
this.state=state;
//randomize color
RGB[0] = random.nextInt(255);
RGB[1] = random.nextInt(255);
RGB[2] = random.nextInt(255);
randomizeColor[0] = 1+random.nextInt(3);
randomizeColor[0] = 1+random.nextInt(3);
randomizeColor[0] = 1+random.nextInt(3);
centerX=mouseInputX;
centerY=mouseInputY;
if (state.equals("s")){ //setup spiral state
ballSizeLowerBound=5;
ballSizeUpperBound=18;
radiusLowerBound=0;
radiusUpperBound=50;
radiusXMultiplier=1;
radiusYMultiplier=1;
}
if (state.equals("p")){ //setup particle state
ballSizeLowerBound = 15;
ballSizeUpperBound =20 + random.nextInt(15);
radiusLowerBound = 5;
radiusUpperBound = 15+ random.nextInt(40);
radiusXMultiplier=1 + random.nextInt(3);
radiusYMultiplier=1 + random.nextInt(3);
}
size = ballSizeUpperBound-1; //ball size
radius = radiusUpperBound-1;
if (instanceCount %2 == 0) // alternate spiral direction
spiralDirection=-spiralDirection;
}
///////////////////////////////////////////////////////////////////////////
public int getX(){return x;}
public int getY(){return y;}
public int getCenterX(){return centerX;}
public int getCenterY(){return centerY;}
public int getXCoor(){return centerX+x*spiralDirection;}
public int getYCoor(){return centerY+y;}
public double getRadius(){return radius;}
public int getSize(){return size;}
public double getTheta(){return theta;}
public String getState(){return state;}
public Color getColor(){return color;}
public void setX(int x){this.x=x;}
public void setY(int y){this.y=y;}
public void setCenterX(int centerX){this.centerX=centerX;}
public void setCenterY(int centerY){this.centerY=centerY;}
public void setRadii(double radii){this.radius=radii;}
public void setTheta(double theta){this.theta=theta;}
public void setSize(int size){this.size=size;}
public void setState(String state){this.state=state;}
public void setColor(Color color){this.color=color;}
//////////////////////////////////////////////////////////////////////////
void move(){
//spiral: dr/dt changes at bounds
if (radius > radiusUpperBound || radius < radiusLowerBound)
u = -u;
//spiral shape formula: parametric equation for the
//polar equation radius = theta
x = (int) (radius * radiusXMultiplier * Math.cos(theta));
y = (int) (radius * radiusYMultiplier * Math.sin(theta));
radius += .3*u;
theta += .3;
//ball size formula
if (size == ballSizeUpperBound || size == ballSizeLowerBound)
t = -t;
size += t;
//ball colors change
for (int i = 0; i < RGB.length; i++)
if (RGB[i] >= 250 || RGB[i] <= 3)
randomizeColor[i] = -randomizeColor[i];
RGB[0]+= randomizeColor[0];
RGB[1]+= randomizeColor[1];
RGB[2]+= randomizeColor[2];
color = new Color(RGB[0],RGB[1],RGB[2]);
}
@Override
public String toString(){
return "r0="+randomizeColor[0] + "r1="+randomizeColor[1] +"r2="+randomizeColor[2]
+" R="+RGB[0]+" G="+RGB[1]+" B="+RGB[2];
//"x="+x+" y="+y+" centerX="+centerX+" centerY="+centerY+" radius="
//+radius+" theta="+theta+" size="+size+" spDirect="+spiralDirection;
}
}
答案 0 :(得分：2)
类Applet的扩展是重量级图形组件，而JApplet和JPanel等Swing组件是轻量级组件。也就是说，JApplet extends applet，所以如果你希望你可以将现有代码转换为JApplet。
听起来你的目的就是把它放在JFrame中，让它作为一个独立的窗口。在这种情况下，请考虑扩展JPanel或JComponent。请注意，您不必像现有代码那样覆盖paint，而是覆盖paintComponent。
如果您有JComponent的孩子，可以将其添加到JFrame并添加滑块或其他组件以创建您的应用。
答案 1 :(得分：1)
根据@justkt的建议，重新考虑Applet以JPanel进行绘制后，您可以创建混合小程序/应用程序，如此example所示。