私は slick2d + Java で衝突検出のアルゴリズムを書いています。これは、私が作成するプラットフォーマー ゲームで最終的に使用します。アルゴリズムがどのように機能するかというと、プレイヤーが四角形にどれだけオーバーラップしているかを検出し、そのオーバーラップによってプレイヤーを四角形の外に移動させます。問題は、アルゴリズムにかなりの数の問題があり、修正方法がわからないことです。まず、プレーヤーが長方形の外に出すぎて、跳ね返っているように見えることがあります。第 2 に、プレーヤーが長方形の内側で小さいながらも目立つ量を移動できる場合があります。最後に、速度を上げると、プレイヤーが四角形を通り抜けることができる場合があります。これは非常に漠然とした質問ですが、何が間違っているのかを理解するために本当に助けが必要です. どんなアイデアでも大歓迎です。
アルゴリズム：
public void Collision(Polygon player, Polygon poly, Vector2f translation){
Vector2f magnitude = new Vector2f();
//Find the vectre of each object
Vector2f p1Centre = new Vector2f(player.getX() + (player.getWidth()/2), player.getY() + (player.getHeight()/2));
Vector2f p2Centre = new Vector2f(poly.getX() + (poly.getWidth()/2), poly.getY() + (poly.getHeight()/2));
//Calculate the distance between the two
Vector2f distance = new Vector2f(p1Centre);
distance.sub(p2Centre);
//Get the absolute distance
Vector2f absDistance = new Vector2f(distance.x<0 ? -distance.x : distance.x, distance.y<0 ? -distance.y : distance.y);
//Get the combined half widths and heights of each object
Vector2f halvedBounds = new Vector2f((player.getWidth() + poly.getWidth())/2.0f, (player.getHeight() + poly.getHeight())/2.0f);
//If the absolute distance is less thate the halved widths heights then there is a collision
if((absDistance.x < halvedBounds.x) && (absDistance.y < halvedBounds.y)){
//Set the magnitude vector to the halved bounds minus the absolute distance
magnitude.x = halvedBounds.x - absDistance.x;
magnitude.y = halvedBounds.y - absDistance.y;
//Only react to the lesser overlap;
if(magnitude.x < magnitude.y){
magnitude.x = (distance.x > 0) ? magnitude.x : -magnitude.x;
magnitude.y = 0;
}
else{
magnitude.y = (distance.y > 0) ? magnitude.y : -magnitude.y;
magnitude.x = 0;
}
//Debug
System.out.println(magnitude.x+" "+magnitude.y);
System.out.println(translation.x+" "+translation.y+"\n");
//Add the magnitude to the player position
position.add(magnitude);
}
}
完全なソース:
import java.util.ArrayList;
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.geom.Polygon;
import org.newdawn.slick.geom.Vector2f;
public class TestCode extends BasicGame {
private Vector2f position = new Vector2f(300, 300);
private ArrayList<Polygon> solids;
private Polygon player;
public TestCode(String title) {
super(title);
}
public static void main(String[] args) throws SlickException{
AppGameContainer game = new AppGameContainer(new TestCode("test"));
game.setDisplayMode(800, 600, false);
game.start();
}
@Override
public void render(GameContainer gc, Graphics g) throws SlickException {
if(gc.isPaused()){
g.setColor(Color.red);
g.drawString("Paused", 90, 10);
}else{
g.setColor(Color.green);
g.drawString("Playing", 90, 10);
}
g.setColor(Color.red);
for(Polygon p : solids)
g.fill(p);
g.setColor(Color.cyan);
g.fill(player);
}
@Override
public void init(GameContainer gc) throws SlickException {
gc.setVSync(true);
solids = new ArrayList<Polygon>();
player = new Polygon(new float[]{
50, 50, // upper left point
70, 50, // upper right
70, 90, // lower right
50, 90 // lower left
});
for(int i=0, x=200, y=200; i<10; i++, x+=40){
solids.add(new Polygon(new float[]{
x, y, // upper left point
x+40, y, // upper right
x+40, y+40, // lower right
x, y+40 // lower left
}));
}
}
@Override
public void update(GameContainer gc, int delta) throws SlickException {
Input input = gc. getInput();
Vector2f translation = new Vector2f(0, 0);
if(input.isKeyDown(Input.KEY_UP))
translation.y = -1f;
if(input.isKeyDown(Input.KEY_DOWN))
translation.y = 1f;
if(input.isKeyDown(Input.KEY_LEFT))
translation.x = -1f;
if(input.isKeyDown(Input.KEY_RIGHT))
translation.x = 1f;
translation.normalise();
translation.x*=2;
translation.y*=2;
position.add(translation);
for(Polygon p : solids)
Collision(player, p, translation);
player.setLocation(position);
}
public void Collision(Polygon player, Polygon poly, Vector2f translation){
Vector2f magnitude = new Vector2f();
//Find the vectre of each object
Vector2f p1Centre = new Vector2f(player.getX() + (player.getWidth()/2), player.getY() + (player.getHeight()/2));
Vector2f p2Centre = new Vector2f(poly.getX() + (poly.getWidth()/2), poly.getY() + (poly.getHeight()/2));
//Calculate the distance between the two
Vector2f distance = new Vector2f(p1Centre);
distance.sub(p2Centre);
//Get the absolute distance
Vector2f absDistance = new Vector2f(distance.x<0 ? -distance.x : distance.x, distance.y<0 ? -distance.y : distance.y);
//Get the combined half widths and heights of each object
Vector2f halvedBounds = new Vector2f((player.getWidth() + poly.getWidth())/2.0f, (player.getHeight() + poly.getHeight())/2.0f);
//If the absolute distance is less thate the halved widths heights then there is a collision
if((absDistance.x < halvedBounds.x) && (absDistance.y < halvedBounds.y)){
//Set the magnitude vector to the halved bounds minus the absolute distance
magnitude.x = halvedBounds.x - absDistance.x;
magnitude.y = halvedBounds.y - absDistance.y;
//Only react to the lesser overlap;
if(magnitude.x < magnitude.y){
magnitude.x = (distance.x > 0) ? magnitude.x : -magnitude.x;
magnitude.y = 0;
}
else{
magnitude.y = (distance.y > 0) ? magnitude.y : -magnitude.y;
magnitude.x = 0;
}
//Debug
System.out.println(magnitude.x+" "+magnitude.y);
System.out.println(translation.x+" "+translation.y+"\n");
//Add the magnitude to the player position
position.add(magnitude);
}
}
}