基本上我的整个程序是让形状在JFrame上移动， 而我遇到的问题是我不能让我的对象移动。
我有一个名为Creatures的类，构造函数创建了我的鱼身体和尾巴。 （我正在制作一个水族馆）。此类扩展到另一个具有move（）方法的类，以便每次发生计时器事件时图片都会移动。
我的问题再一次是我不能让图片/形状/物体移动。 如果有人伸出援手，我将非常感激=]
这是完整的一类生物
import java.awt.geom.Ellipse2D;
import java.awt.Color;
import java.awt.Polygon;
import java.awt.Graphics2D;
public class Creatures extends Moveable2DShape{
private Color color;
private int delay, number;
private int xPos2, yPos2;
private final int POINTS = 3;
private int []x = new int[POINTS];
private int []y = new int[POINTS];
private double width, height;
Ellipse2D.Double body;
Polygon tail;
public Creatures(int xPos, int yPos, int shapeWidth, int shapeHeight, int bwidth, int bheight, double xSpeed, double ySpeed, Color c){
super(xPos, yPos, shapeWidth, shapeHeight, bwidth, bheight, xSpeed, ySpeed);
color = c;
xPos2 = xPos;
yPos2 = yPos;
width = shapeWidth;
height = shapeHeight;
}
public Polygon triangle(int xPos, int yPos){
x[0] = xPos + 100;
x[1] = x[0];
x[2] = (int)(xPos + width/2);
y[0] = (int)(yPos + (height));
y[1] = yPos;
y[2] = (int)(yPos + height/2);
tail = new Polygon(x,y,POINTS);
return tail;
}
//public void move(){
}
public void draw(Graphics2D g){
body = new Ellipse2D.Double(xPos2, yPos2, width, height);
//System.out.println(xPos2 + " " + yPos2 + " " + width + " " + height);
triangle(xPos2, yPos2);
g.setColor(color);
g.fill(body);
g.fill(tail);
}
}
我应该覆盖从Moveabled2DShape类继承的move（）方法，但我还没有，因为我只想在覆盖它之前测试该方法。但现在我的问题是我需要更新xPos2和yPos2
答案 0 :(得分：1)
我对创作课程的全面解决方案
import java.awt.geom.Ellipse2D;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.Polygon;
import java.awt.Graphics2D;
public class Creatures extends Moveable2DShape{
private Color color;
private int delay, number, t;
private int xPos, yPos;
private double xSpeed, ySpeed;
private final int POINTS = 3;
private int []x = new int[POINTS];
private int []y = new int[POINTS];
private double width, height;
private boolean dead;
Ellipse2D.Double body;
Polygon tail;
public Creatures(int xPos, int yPos, int shapeWidth, int shapeHeight, int bwidth, int bheight, double xSpeed, double ySpeed, Color c, int type, boolean l){
super(xPos, yPos, shapeWidth, shapeHeight, bwidth, bheight, xSpeed, ySpeed);
color = c;
this.xPos = xPos;
this.yPos = yPos;
this.xSpeed = xSpeed;
this.ySpeed = ySpeed;
width = shapeWidth;
height = shapeHeight;
t = type;
dead = l;
}
/*@x[3] calculate the x position points of the tail
*@y[3] calculate the y position points of the tail
*@tail create the polygon using the points and a defined constant of 3
*@return the polygon @tail*/
public Polygon triangle(int xP, int yP){
x[0] = xP + 100;
x[1] = x[0];
x[2] = (int)(xP + width/2);
y[0] = (int)(yP + (height));
y[1] = yP;
y[2] = (int)(yP + height/2);
tail = new Polygon(x,y,POINTS);
return tail;
}
/*@newBW will determine the new width of the bounding box
*@return the new bounding box width*/
public int newBWidth(){
int newBW;
newBW = (int)(x[0] - getBoundingBoxMaxX()) + (int)getBoundingBoxWidth();
return newBW;
}
/*when called, the move method of Creatures will move along the x-values\
*set the new bounding box with the new calculated width */
public void move(){
this.xPos=(int) (getXPos() - xSpeed);
int overShoot = (int) (xPos + getBoundingBoxWidth() - environmentWidth);
if (xPos <= 0)
{
xPos = 0;
xSpeed = -xSpeed ;
}
else if (overShoot > 0)
{
xPos = (int)(environmentWidth - getBoundingBoxWidth());
xSpeed = - xSpeed ;
}
/*
Reflect the object if it goes too far
*/
overShoot = (int) (yPos + getBoundingBoxHeight() - environmentHeight);
if (yPos <= 0)
{
yPos = 0;
ySpeed = -ySpeed ;
}
else if (overShoot > 0)
{
yPos = (int) (environmentHeight - getBoundingBoxHeight());
ySpeed = - ySpeed ;
}
if(xPos == 0 || xPos == 880){
this.yPos =+ (int)(getYPos() + ySpeed);
}
if(yPos == 650){
this.yPos =+ (int)(getYPos() + ySpeed);
}
// move the shape to the new position
moveTo(xPos,yPos);
setBoundingBox(getXPos() , getYPos() , newBWidth(), height);
}
/*Detect if two bounding boxes intersects with one another if two intersects
*call the collision response method and @return true, else @return false. */
public boolean collisionDetect(Moveable2DShape other){
if(getBoundingBox().intersects(other.getBoundingBox())){
return true;
}
return false;
}
/*@other2 cast the Moveable2DShape object into a Creatures object and compare
*if @other2 object type is greater than the current object then the current object dies
*if the two objects are equal to each other then change the color of both objects randomly
*otherwise @other2 dies. */
public void collisionResponse(Moveable2DShape other){
int []c2 = new int[3];
int []c3 = new int[3];
Creatures other2 = (Creatures) other;
if (getType() < other2.getType()){
fishiesDie();
}else if(getType() == other2.getType()){
for(int a = 0; a < 3; a++){
c2[a] = (int)(Math.random()*255) + 1;
c3[a] = (int)(Math.random()*255) + 1;
}
color = new Color(c2[0], c2[1], c2[2]);
other2.color = new Color(c3[0], c3[1], c3[2]);
}else{
other2.fishiesDie();
}
}
/*@return the type of the fish */
public int getType(){
return t;
}
/*@dead equals to true when called */
public void fishiesDie(){
dead = true;
}
/*@return dead */
public boolean isDead(){
return dead;
}
/*@body draw the general body ellipse
*@g set the colour and draw the general fish shape(body and tail)*/
public void draw(Graphics2D g){
body = new Ellipse2D.Double((int)getXPos(), (int)getYPos() , width, height);
triangle((int)getXPos(), (int)getYPos());
//g.draw(getBoundingBox());
g.setColor(color);
g.fill(body);
g.fill(tail);
}
}