我需要一个项目的帮助。对于这个项目，我们创建了单击时“冻结”的移动矩形。如果它们与另一个碰撞，我们还应该使冻结的矩形解冻。我已经完成了第一步，但如果它们发生碰撞，我似乎无法让矩形解冻。如果这没有意义，我深表歉意。我是 Java 和堆栈溢出的新手。这是我的课程代码。
import edu.princeton.cs.introcs.StdDraw;
import java.util.Random;
import java.awt.Color;
public class MovingRectangle {
//canvas = canvasSize;
public int width; //width of rectangle
public int height; //height of rectangle
public double xVelocity; //x velocity
public double yVelocity; //y velocity
public int xPosition; //x starting position
public int yPosition; //y starting position
private boolean isFrozen; //the rectangle is still moving
// private int R, G, B;
Random rng = new Random();
public int R = rng.nextInt(256);
public int G = rng.nextInt(256);
public int B = rng.nextInt(256); //RGB variables
public int canvas;
public Color c;//canvas size
public MovingRectangle(int x, int y, int w, int h, double xv, double yv, int canvasSize) {
xPosition = x;
yPosition = y;
width = w;
height = h;
xVelocity = xv;
yVelocity = yv;
canvas = canvasSize;
isFrozen = false;
c =new Color(R,G,B);
}
//draws rectangle
public void draw() {
// Random rng = new Random();
// R = rng.nextInt(256);
// G = rng.nextInt(256);
// B = rng.nextInt(256);
// c = new Color(R,G,B);
StdDraw.setPenColor(c);
StdDraw.filledRectangle(xPosition, yPosition, width/2, height/2);
}
//pick a new random color
// public void color() {
// Random rng = new Random();
//
// R = rng.nextInt(256);
// G = rng.nextInt(256);
// B = rng.nextInt(256);
// c = new Color(R,G,B);
// }
//updates position every frame
public void move() {
if (isFrozen == false) {
xPosition += xVelocity;
yPosition += yVelocity;
// xPosition += 0;
// yPosition += 0;
//Check for hitting sides of canvas
if (xPosition > canvas) {
xVelocity *= -1;
//color();
}
if( xPosition < 0) {
xVelocity *= -1;
//color();
}
if (yPosition > canvas ) {
yVelocity *= -1;
//color();
}
if(yPosition <= 0) {
yVelocity*=-1;
//color();
}
}
}
public boolean ifColliding(MovingRectangle rectangle) {
int rightedge = rectangle.xPosition + rectangle.width/2;
int leftedge = rectangle.xPosition - rectangle.width/2;
int topedge = rectangle.yPosition + rectangle.height/2;
int bottomedge = rectangle.yPosition - height/2;
int rightedge2 = this.xPosition + this.width/2;
int leftedge2 = this.xPosition - this.width/2;
int topedge2 = this.yPosition + this.height/2;
int bottomedge2 = this.yPosition - this.height/2;
if(leftedge<rightedge2 && leftedge2<rightedge && topedge>bottomedge2 && bottomedge<topedge2) {
return true;
}
else {
return false;
}
}
public void freeze() {
if(StdDraw.mousePressed() && StdDraw.mouseX() <= xPosition+width && StdDraw.mouseX() >= xPosition-width && StdDraw.mouseY() <=yPosition+height &&StdDraw.mouseY() >= yPosition-height) {
xVelocity=0;
yVelocity=0;
c= new Color(100,0,0);
isFrozen= true;
}
}
public boolean isFrozen() {
return isFrozen;
}
public void winState() {
StdDraw.clear();
}
public void setFrozen(boolean val) {
isFrozen = false;
if (isFrozen == false) {
xPosition += xVelocity;
yPosition += yVelocity;
}
}
// public void stop() {
// isMoving = false;
// }
}
还有我的司机。
import edu.princeton.cs.introcs.StdDraw;
import java.util.Random;
import java.util.Scanner;
import java.awt.Color.*;
import edu.princeton.cs.introcs.StdDraw;
public class RectangleDriver {
public static final int canvas = 500;
public static void main(String[] args) {
//set canvas size
StdDraw.setCanvasSize(canvas,canvas);
StdDraw.setXscale(canvas, 0);
StdDraw.setYscale(0, canvas);
//assign variables
Random rng = new Random();
//make a rectangle
MovingRectangle[] rectangles = new MovingRectangle[5]; //(x, y, w, h, xv, yv, canvas);
for(int i =0;i<rectangles.length;i++) {
int x = rng.nextInt(canvas); //xPosition
int y = rng.nextInt(canvas); //yPosition
int w = rng.nextInt(100)+20; //width
int h = rng.nextInt(100)+20; //height
double xv = rng.nextInt(5)+2; //xVelocity
double yv = rng.nextInt(5)+2; //yVelocity
rectangles[i]= new MovingRectangle(x,y,w,h,xv,yv,canvas);
}
//while isMoving, the rectangles move
while (true) {
StdDraw.clear();
for(int i =0; i<rectangles.length;i++) {
rectangles[i].move();
rectangles[i].draw();
rectangles[i].freeze();
System.out.println(rectangles[i].isFrozen());
//for 0
if(rectangles[i].ifColliding(rectangles[1])){
if(rectangles[0].isFrozen()) {
rectangles[0].setFrozen(false);
}
}
if(rectangles[i].ifColliding(rectangles[2])){
if(rectangles[0].isFrozen()) {
rectangles[0].setFrozen(false);
}
}
if(rectangles[i].ifColliding(rectangles[3])){
if(rectangles[0].isFrozen()) {
rectangles[0].setFrozen(false);
}
}
if(rectangles[i].ifColliding(rectangles[4])){
if(rectangles[0].isFrozen()) {
rectangles[0].setFrozen(false);
}
}
//for 1
if(rectangles[1].ifColliding(rectangles[0])){
if(rectangles[1].isFrozen()) {
rectangles[1].setFrozen(false);
}
}
if(rectangles[1].ifColliding(rectangles[2])){
if(rectangles[1].isFrozen()) {
rectangles[1].setFrozen(false);
}
}
if(rectangles[1].ifColliding(rectangles[3])){
if(rectangles[1].isFrozen()) {
rectangles[1].setFrozen(false);
}
}
if(rectangles[1].ifColliding(rectangles[4])){
if(rectangles[1].isFrozen()) {
rectangles[1].setFrozen(false);
}
}
// for 2
if(rectangles[2].ifColliding(rectangles[0])){
if(rectangles[2].isFrozen()) {
rectangles[2].setFrozen(false);
}
}
if(rectangles[2].ifColliding(rectangles[1])){
if(rectangles[2].isFrozen()) {
rectangles[2].setFrozen(false);
}
}
if(rectangles[2].ifColliding(rectangles[3])){
if(rectangles[2].isFrozen()) {
rectangles[2].setFrozen(false);
}
}
if(rectangles[2].ifColliding(rectangles[4])){
if(rectangles[2].isFrozen()) {
rectangles[2].setFrozen(false);
}
}
//for 3
if(rectangles[3].ifColliding(rectangles[1])){
if(rectangles[3].isFrozen()) {
rectangles[3].setFrozen(false);
}
}
if(rectangles[3].ifColliding(rectangles[2])){
if(rectangles[3].isFrozen()) {
rectangles[3].setFrozen(false);
}
}
if(rectangles[3].ifColliding(rectangles[0])){
if(rectangles[3].isFrozen()) {
rectangles[3].setFrozen(false);
}
}
if(rectangles[3].ifColliding(rectangles[4])){
if(rectangles[3].isFrozen()) {
rectangles[3].setFrozen(false);
}
}
//for 4
if(rectangles[4].ifColliding(rectangles[1])){
if(rectangles[4].isFrozen()) {
rectangles[4].setFrozen(false);
}
}
if(rectangles[4].ifColliding(rectangles[2])){
if(rectangles[4].isFrozen()) {
rectangles[4].setFrozen(false);
}
}
if(rectangles[4].ifColliding(rectangles[3])){
if(rectangles[4].isFrozen()) {
rectangles[4].setFrozen(false);
}
}
if(rectangles[4].ifColliding(rectangles[0])){
if(rectangles[4].isFrozen()) {
rectangles[4].setFrozen(false);
}
}
}
if(rectangles[0].isFrozen()==true && rectangles[1].isFrozen()==true && rectangles[2].isFrozen()==true && rectangles[3].isFrozen()==true && rectangles[4].isFrozen()==true) {
StdDraw.clear();
StdDraw.text(250, 250, "You win!");
}
StdDraw.show(100);
}
}
}