Question

感谢ellertsmari，我能够进行碰撞检测。 Adding Collision to Rectangles so Sprite Wont Go Through?

现在我想让我的雪碧在碰撞时停止，这样他就不会在墙上行走了。

这是我与游戏的链接： https://yewtreedesign.github.io/441_HW/HW11/index.html

这是帮助我使用精灵的源代码。 https://dev.to/martyhimmel/moving-a-sprite-sheet-character-with-javascript-3adg

所以我认为：

positionX + deltaX > 0（检查左边缘碰撞。）

positionX + SCALED_WIDTH + deltaX < canvas.width（检查右边缘碰撞。）

positionY + deltaY > 0（检查上边缘碰撞。）

positionY + SCALED_HEIGHT + deltaY < canvas.height（检查底边缘碰撞。）

我尝试使用如何在Sprite上检测到冲突的指南。我已经完成了对矩形的碰撞检测。

我尝试在代码中添加walls.x，walls.y，walls.width和walls.height，以防止Sprite越界。我的精灵仍然停留在他的起点上。我不确定我需要做什么。我对此很陌生。我知道的不是canvas.height/canvas.width。我应该在墙壁上使用walls.height/walls.width。


const SCALE = 1;
const WIDTH = 18;
const HEIGHT = 31;
const SCALED_WIDTH = SCALE * WIDTH;
const SCALED_HEIGHT = SCALE * HEIGHT;
const CYCLE_LOOP = [0, 1, 0, 2];
const FACING_DOWN = 0;
const FACING_UP = 1;
const FACING_LEFT = 2;
const FACING_RIGHT = 3;
const FRAME_LIMIT = 12;
const MOVEMENT_SPEED = 1;
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
let keyPresses = {};
let currentDirection = FACING_DOWN;
let currentLoopIndex = 0;
let frameCount = 0;
let positionX = 0;
let positionY = 0;
let img = new Image();
let shiba = new Image();
let rays = new Image();
let doritos = new Image();
let walls=     [{"id": "wall1", "x": 105.3, "y": -1,    "width": 14.1, "height": 73.5},
                {"id": "wall2", "x": 366.5, "y": -1,    "width": 14.1, "height": 73.5},
                {"id": "wall3", "x": 367,   "y": 173.2, "width": 120,  "height": 14.1},
                {"id": "wall4", "x": -1,    "y": 173.2, "width": 120,  "height": 14.1},
                {"id": "wall5", "x": 105.3, "y": 267.5, "width": 14.1, "height": 73.5},
                {"id": "wall6", "x": 366.5, "y": 267.5, "width": 14.1, "height": 73.5}
              ];
              function drawWalls(){
                for(var i=0; i< walls.length; i++){
                  ctx.fillStyle="white";
                  ctx.fillRect(walls[i].x, walls[i].y, walls[i].width,walls[i].height);
                }
            }
            function collidingWith(walls){
              console.log("you are colliding with:", walls.id);

}
window.addEventListener('keydown', keyDownListener);
function keyDownListener(event) {
    keyPresses[event.key] = true;
}
window.addEventListener('keyup', keyUpListener);
function keyUpListener(event) {
    keyPresses[event.key] = false;
}
function loadImage() {
    img.src = 'atlus/mainsprite.png';
  shiba.src = 'image/shiba.gif';
  rays.src='image/shades.png';
  doritos.src='image/dorit.png';
  img.onload = function() {
    window.requestAnimationFrame(gameLoop);
  };
}
function drawFrame(frameX, frameY, canvasX, canvasY) {
  ctx.beginPath();
  ctx.drawImage(shiba, 225,20);
  ctx.closePath();
  ctx.beginPath();
  ctx.drawImage(rays, 400,20);
  ctx.drawImage(doritos, 420,250);
  ctx.drawImage(img,
                frameX * WIDTH, frameY * HEIGHT, WIDTH, HEIGHT,
                canvasX, canvasY, SCALED_WIDTH, SCALED_HEIGHT);
  ctx.closePath();
}

loadImage();
function gameLoop() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  drawWalls();

  let hasMoved = false;
  if (keyPresses.ArrowUp) {
    moveCharacter(0, -MOVEMENT_SPEED, FACING_UP);
    hasMoved = true;
  } else if (keyPresses.ArrowDown) {
    moveCharacter(0, MOVEMENT_SPEED, FACING_DOWN);
    hasMoved = true;
  }
  if (keyPresses.ArrowLeft) {
    moveCharacter(-MOVEMENT_SPEED, 0, FACING_LEFT);
    hasMoved = true;
  } else if (keyPresses.ArrowRight) {
    moveCharacter(MOVEMENT_SPEED, 0, FACING_RIGHT);
    hasMoved = true;
  }
  if (hasMoved) {
    frameCount++;
    if (frameCount >= FRAME_LIMIT) {
      frameCount = 0;
      currentLoopIndex++;
      if (currentLoopIndex >= CYCLE_LOOP.length) {
        currentLoopIndex = 0;
      }
    }
  }
  if (!hasMoved) {
    currentLoopIndex = 0;
  }
  drawFrame(CYCLE_LOOP[currentLoopIndex], currentDirection, positionX, positionY);
  window.requestAnimationFrame(gameLoop);
}
function moveCharacter(deltaX, deltaY, direction) {
  walls.forEach(walls=>{
  if( positionX + deltaX + SCALED_WIDTH > walls.x && positionX + deltaX < walls.x + walls.width
    && positionY + deltaY + SCALED_HEIGHT > walls.y && positionY + deltaY < walls.y +walls.height
  ){
    collidingWith(walls);
  }
})

if (positionX + deltaX > 0 && positionX + SCALED_WIDTH + deltaX < canvas.width) {positionX += deltaX;}
if (positionY + deltaY > 0 && positionY + SCALED_HEIGHT + deltaY < canvas.height) {positionY += deltaY;}
  currentDirection = direction;
}

一切都应有的出现。在控制台中，一旦与其中一堵墙发生碰撞，它将显示您已与wall [i]发生碰撞。太好了我只需要帮助，这样我的雪碧就不会在墙上走动了。

更新：

精灵与墙碰撞时不会停止...问题是传送回它的开始位置... https://jsfiddle.net/YewtreeStudio/b1v9Loey/4/

如何在碰撞时停止精灵（不要在墙壁上行走）？

0 个答案: