我使用Java Graphics2D和Path2D处理与某些钻石的碰撞。但是，我得到了奇怪的结果。直到行进的黑色钻石移动到蓝色钻石之外，其中碰撞功能返回真实几秒钟然后随着黑色钻石向前移动而停止，似乎没有碰撞。了解正在发生的事情的最佳方式是简单地为自己测试代码。
当黑色钻石击中蓝色钻石时，它应立即停止。简单。但是，这似乎并没有发生在这里。因为黑色钻石停在蓝色钻石外面。
此体验的主要目标是使用等长投影。如果你知道更好的方法，请告诉我！
main.java
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.geom.Path2D;
import java.util.ArrayList;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Main extends JPanel implements ActionListener, KeyListener{
static int WIDTH;
static int HEIGHT;
Rectangle rectangle = new Rectangle(0, 0, 100, 100);
Rectangle rectangle2 = new Rectangle(110, 110, 100, 100);
ArrayList<GraphicalObject> objs = new ArrayList<GraphicalObject>();
int targetFPS = 60;
int currentFPS = targetFPS;
int boxx = -500;
int boxy = 0;
boolean rising = false;
boolean ontop = false;
long oldFpsLoop = System.currentTimeMillis();
long newFpsLoop = oldFpsLoop;
int ticks = 0;
Timer timer = new Timer(1000/targetFPS, this);
public Main(){
timer.start();
addKeyListener(this);
setFocusable(true);
setFocusTraversalKeysEnabled(false);
requestFocus();
}
public void paintComponent(Graphics g){
super.paintComponent(g);
for (int i=0; i < objs.size(); i++){
GraphicalObject cobj = objs.get(i);
Graphics2D g2 = (Graphics2D) g.create();
g2.setColor(Color.RED);
g2.drawLine(getWidth() / 2, 0, getWidth() / 2, getHeight());
g2.drawLine(0, getHeight() / 2, getWidth(), getHeight() / 2);
if (cobj.type.equals("text")){
g2.setColor(cobj.color);
g2.drawString(cobj.content, cobj.x, cobj.y);
} else if (cobj.type.equals("rect")){
g2.setColor(cobj.color);
/**/
AffineTransform at = new AffineTransform();
at.setToRotation(Math.toRadians(0), WIDTH/2, HEIGHT/2);
at.translate(WIDTH/2-cobj.w/2, HEIGHT/2-cobj.h/2);
g2.setTransform(at);
/**/
g2.drawRect(cobj.x, cobj.y, cobj.w, cobj.h);
g2.fill(cobj.projection);
}
g2.dispose();
}
}
public static void main(String[] args){
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
WIDTH = (int) screenSize.getWidth();
HEIGHT = (int) screenSize.getHeight();
Main main = new Main();
JFrame frame = new JFrame();
frame.setTitle("360 ATTACK");
frame.setSize(WIDTH, HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.add(main);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
ticks++;
newFpsLoop = System.currentTimeMillis();
if (newFpsLoop - oldFpsLoop > 1000){
oldFpsLoop = newFpsLoop;
currentFPS = ticks;
if (currentFPS < targetFPS){
for (int i=0; i<targetFPS-currentFPS;i++){
logic();
}
}
ticks = 0;
}
logic();
repaint();
}
public void logic(){
objs = new ArrayList<GraphicalObject>();
objs.add(new GraphicalObject("fps", "text", 0, 10, "FPS: " + currentFPS, Color.BLACK));
objs.add(new GraphicalObject("base", "rect", 0, 0, 200, 200, Color.BLUE));
if (ontop == false){
objs.add(new GraphicalObject("box", "rect", boxx, boxy, 20, 20, Color.BLACK));
objs.add(new GraphicalObject("top","rect", -100, -100, 200, 200, Color.RED));
} else {
objs.add(new GraphicalObject("top", "rect", -100, -100, 200, 200, Color.RED));
objs.add(new GraphicalObject("box", "rect", boxx, boxy, 20, 20, Color.BLACK));
}
GraphicalObject box = null;
GraphicalObject base = null;
GraphicalObject top = null;
for (int i=0; i<objs.size();i++){
String name = objs.get(i).name;
if (name.equals("box")){
box = objs.get(i);
} else if (name.equals("base")) {
base = objs.get(i);
} else if (name.equals("top")){
top = objs.get(i);
}
}
if(collision(box, base)){
boxx--;
}
if (rising){
boxx--;
boxy--;
} else {
boxx++;
}
}
public boolean collision(GraphicalObject a, GraphicalObject b){
Area aArea = new Area(a.projection);
Area bArea = new Area(b.projection);
aArea.intersect(bArea);
return !aArea.isEmpty();
}
@Override
public void keyPressed(KeyEvent e) {
int c = e.getKeyCode();
if (c == KeyEvent.VK_ESCAPE){
System.exit(0);
}
}
@Override
public void keyReleased(KeyEvent e) {
}
@Override
public void keyTyped(KeyEvent e) {
}
}
GraphicalObject.java
import java.awt.Color;
import java.awt.geom.Path2D;
public class GraphicalObject {
int x, y, w, h;
public Color color;
public String type;
public String content;
public Path2D.Double projection;
public String name;
public GraphicalObject(String name, String type, int x, int y, int w, int h, Color color){
this.type = type;
this.color = color;
this.x = x;
this.y = y;
this.w = w;
this.h = h;
this.name = name;
projection = new Path2D.Double();
projection.moveTo(x+(w/5), y+(h/5));
projection.lineTo(x+w, y);
projection.lineTo(x+w-(w/5), y+h-(h/5));
projection.lineTo(x,y+h);
projection.lineTo(x+(w/5), y+(h/5));
}
public GraphicalObject(String name, String type, int x, int y, String content, Color color){
this.name = name;
this.x = x;
this.y = y;
this.color = color;
this.type = type;
this.content = content;
}
}