Space 入侵者项目

Question

您好，我一直在处理 space 入侵者游戏，我对 java/coding 比较陌生。我的问题是我真的不明白如何让碰撞真正起作用，还有我的外星人（space 飞船），他们从左到右移动但不向下移动。这些是我很难解决的两个主要问题。这是我下面的代码，任何专业的建议将不胜感激。

PImage SpaceShip;
PImage Laser;
int TankX = 450;
int TankY = 450;
int SpaceshipX = 20;
int SpaceshipY = 20;
int MoveSpaceShipDown = 5;
int TankSizeX = 200;
int TankSizeY = 90;
int ShipSizeX = 90;
int ShipSizeY = 80;
int Xtankspeed = 2;
int LaserX = 9999;
int LaserY = TankY;
int LasersizeX = 10;
int LasersizeY = 40;
int spaceShipDirection =  5;
int spaceshipxspeed = 2;
int spaceshipSpeed = 5;
//int Xtankspeed2 = -6;
boolean moveRight = false;
boolean moveLeft = false;
boolean ShowLaser = false;
int[] ShipX = new int [15];
int [] ShipY = new int [4];
int gameState = 1;
int StopWatch = 0;


void setup() {
  size(1000, 500);
  imageMode(CENTER);
  SpaceShip = loadImage("Spaceship.png");
  SpaceShip.resize( ShipSizeX, ShipSizeY );
  Laser = loadImage ("LaserBeam.png");
  Laser.resize(LasersizeX, LasersizeY);
  Tank = loadImage("Tank.png");
  Tank.resize(TankSizeX, TankSizeY);
  setSpaceShipPositions();
}

void setSpaceShipPositions() {


for(int j = 0; j < ShipY.length; j++){
  for (int i = 0; i < ShipX.length; i++) {
    ShipX[i] = 50 + 50*i;
  }
  ShipY[j] = 50 + 50*j;
}
}


void draw() {
  if (gameState == 1) {
    IntroScreen();
  } else if (gameState == 2) {
    startGame();
  }
}
void IntroScreen() {
  background(#000000);
  textMode(CENTER);
  textSize(50);
  text("Space Defenders", 325, 250);
}
void startGame() {
  background (#2f3069);
  MakeLaser();
  Maketank();
  Maketankmove();
  checkiftankhitedge();
 
  for (int j = 0; j < ShipY.length; j++) {
  for (int i = 0; i < ShipX.length; i++) {
    MakeSpaceShip(i,j);
    moveSpaceShip();
    checkiflaserhitspaceship(i,j);
  }
  }

  Shootlaser();
  Makelaserreturentoorignalposition();
  
  //makespaceshipgodown();
}



void keyPressed() {
  println(keyCode);
  if (keyCode == 39) { //right key
    moveRight = true;
  }
  if (keyCode == 37) { //leftkey
    moveLeft = true;
  }
  if (keyCode == 32 && ShowLaser == false) { //Spacebar
    ShowLaser = true;
    LaserX = TankX;
    LaserY = TankY;
  }
  if (keyCode == 10) {
    gameState = 2;
  }
}


void keyReleased() {

  if (keyCode == 39) { //right key
    moveRight = false;
  }
  if (keyCode == 37) { //leftkey
    moveLeft = false;
  }
  if (keyCode == 32) { //Spacebar
  }
}

void Maketank() {// this is to make the tank
  //PImage.resize(0,5);

  imageMode(CENTER);
  image(Tank, TankX, TankY);
}
void MakeLaser() {
  if (ShowLaser) {
    image(Laser, LaserX, LaserY);
  }
}
void MakeSpaceShip(int i, int j) {
  image(SpaceShip, ShipX[i], ShipY[j]);
  //for (int i = 0; i < spaceShipX.length; i++){
  // image( spaceShipX[i] - 15, ,SpaceshipX, SpaceshipY ); Confused
}

int lastlaptime = 0;
int timesincelastlap = 0;


//void moveSpaceShip(int i, int j) {

/*StopWatch = millis();
 timesincelastlap = StopWatch - lastlaptime;
 
 if (timesincelastlap > 500) {
 
 spaceShipX[i] += spaceshipxspeed;
 lastlaptime = millis();
 
 
 // if (spaceShipX[i] > 990) {
 // SpaceshipY = SpaceshipY + 30;
 //spaceShipDirection = -1*spaceShipDirection;
 
 // }
 //if (spaceShipX[i] < 10) {
 // SpaceshipY = SpaceshipY + 30;
 //spaceShipDirection = -1*spaceShipDirection;
 //}
 //}
 }*/

void moveSpaceShip() {
  /*for (int i = 0; i < 15; i++){
   if (spaceShipX[40] > 990){
   spaceShipDirection = -1*spaceShipDirection;
   SpaceshipY = SpaceshipY + 30;
   }
   if (spaceShipX[1] < 10){
   spaceShipDirection = -1*spaceShipDirection;
   SpaceshipY = SpaceshipY + 30;
   }
   }
   for (int i = 0; i < 15; i++){
   spaceShipX[i] = spaceShipX[i] + spaceShipDirection;
   }*/
  if (millis() - StopWatch > 1000) {
    StopWatch = millis();
    checkIfHitEdge();
    moveShips();
  }
}

void moveShips() {
  for (int i = 0; i < 15; i++) {
    ShipX[i] = ShipX[i] + spaceShipDirection*spaceshipSpeed;
  }
}
void checkIfHitEdge() {
  for (int i = 0; i < 15; i++) {
    if (ShipX[14] > 990) {
       SpaceshipY = SpaceshipY + 5;
      spaceShipDirection = -1*spaceShipDirection;
     
    }
  
    if (ShipX[0] < 10) {
      spaceShipDirection = -1*spaceShipDirection;
      SpaceshipY = SpaceshipY + 5;
    }
  }
  
}

//void makespaceshipgodown(){
// if(SpaceshipX + 45 > width){
//SpaceshipY++;
// }
//}
void Maketankmove() {
  if (moveLeft == true) {
    TankX--; //this makes the tank go left
    TankX = TankX - Xtankspeed;//this is for the speed of the tank
  }
  if (moveRight == true) {
    TankX++;//this makes the tank go right
    TankX = TankX + Xtankspeed;//the speed of the tank
  }
}
void checkiftankhitedge() {
  if (TankX > width-50) {
    TankX = 950;
    moveRight = false;
  }
  if (TankX-100 < -50) {
    TankX = 50;
    moveLeft = false;
  }
}
void Makelaserreturentoorignalposition() {
  //if(TankX++){
  if (LaserY == 0) {
    LaserY = TankY;
    LaserX = 9999;
    ShowLaser = false;
  }
}
void checkiflaserhitspaceship(int i, int j) {
 /* int Lasertop = LasersizeY - 20;
  int Laserbottom = LasersizeY + 20;
  int LaserLeft= LasersizeX - 5;
 int LaserRight = LasersizeX +5;
  int SpaceShipBottom = ShipY[j] - 40;
  int SpaceShipTop = ShipY[j] + 40;
   int SpaceShipleft = spaceShipX[i] - 45;
   int SpaceShipright = spaceShipX[i] + 45;
  boolean LaserhitSpaceship = Lasertop > SpaceShipBottom &&
  Laserbottom < SpaceShipTop &&
   LaserLeft < SpaceShipright &&
  LaserRight > SpaceShipleft;
  if(LaserhitSpaceship == true){
  spaceShipX[0] = 90000;
  }*/
}
void Shootlaser() {
  if (ShowLaser == true) {
    LaserY-=5;
  }
}```

Answer 1

这是我认为的问题所在。首先，处理并不是制作像 Space Invaders 这样的游戏的最佳语言。您不能一次有多个键输入。例如，如果我按下左箭头，按住它，然后按下右箭头，然后松开左箭头，处理将忽略左箭头。 Processing有一键输入：key。它只能有一个值。您不能一次跟踪多个输入。你也许可以用你的鼠标替换它——如果鼠标离左边很远，向左移动。如果它离右边很远，请向右移动。在中间？保持静止。

除此之外，您还想检查碰撞。首先，把敌人变成一个物体。我假设你知道如何制作物体。如果没有，请查看 this tutorial. 现在，我们需要检查碰撞。我建议在敌人内部制作一个碰撞方法 class，这是我想象的样子：

boolean collidingWithPlayer() {
    return (playerX > enemyX && playerX < enemyX + enemyW
    && playerY > enemyY && playerY < enemyY + enemyH);
}

随意使用。祝你游戏顺利。

Space 入侵者项目

Space Invader project

java

processing

collision