Javascript Pac-Man碰撞检测

时间：2016-06-02 10:41:48

标签： javascript html canvas

背景信息：我是Canvas，javascript和jQuery的初学者，以及整体游戏开发。这是我的第一部非文字游戏。

我已经在这个问题上工作了几天，并打了2个墙，我认为这是相互关联的。我将在这里描述问题，然后给你代码;

  1. 当我将瓷砖绘制到画布上时，电路板似乎是镜像的。我不确定为什么会这样，但我似乎无法修复它。

  2. 我已经为我的角色制定了可用的路线，但碰撞检测只能上下移动，但不能左右移动。

    3. 以下是代码：

    var TILE_WIDTH = 32, TILE_HEIGHT = 32, TICK_SPEED = 1000/30;
var playerimg = new Image(), ghostimg = new Image(), walkableimg = new Image(), wallimg = new Image(); 

playerimg.src = "player.png";
ghostimg.src = "ghost.png";
walkableimg.src = "walkable.png";
wallimg.src = "wall.png";


var map = [
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]



]

var spawnx = 128, spawny = 128;


var player = {direction: "right",image: playerimg, x:spawnx, y: spawny, xdir: spawnx, ydir: spawny}, ghost = {image:ghostimg, x:128 , y:128}, wall = {walkable: false,image: wallimg}, walkable = {walkable: true, image: walkableimg}; 


function main(){
    setInterval(

        function(){

            tick();
        }, TICK_SPEED)

}


function collisionDetect(direction){
    if(direction = "up" && map[(player.ydir/32)][(player.xdir/32)] == 0){
        player.y = player.ydir; //up    
        console.log("moved up");


    } else if(direction = "down" && map[(player.ydir/32)][(player.xdir32)] == 0){
        player.y = player.ydir; //down
        console.log("moved down");


    } else if(direction = "left" && map[player.ydir/32][(player.xdir/32)] == 0){
        player.x = player.xdir; //left
        console.log("moved left");

    } else if(direction = "right" && map[player.ydir/32][(player.xdir/32)] == 0){
        player.x = player.xdir; //right
        console.log("moved right ");
    } 

    player.xdir = player.x;
    player.ydir = player.y;
}

function solidDetect(block){

}



function render(){
    var field = document.getElementById("draw");
    var ctx = field.getContext("2d");
    renderField();
    renderPlayer();

}  

function renderPlayer(){
    var field = document.getElementById("draw");
    var ctx = field.getContext("2d");
    console.log(player.x,player.y,player.xdir,player.ydir);
    ctx.drawImage(player.image,player.x,player.y);
    ctx.rect(player.x,player.y,10,10);
    ctx.stroke();
}

function renderField(){
    var field = document.getElementById("draw");
    var ctx = field.getContext("2d");

    for(var i = 0; i < 20; i++){
        for(var j = 0; j<20; j++){

                if(map[i][j] == 1){
                    ctx.drawImage(wall.image,TILE_HEIGHT*i,TILE_HEIGHT*j);

                } else if(map[i][j] == 0){
                    ctx.drawImage(walkable.image,TILE_HEIGHT*i,TILE_HEIGHT*j);

                }



        }
    }
}

function tick(){

    render();

}





//key listener



$(document).keypress(function (eventObject) {
        var key = eventObject.keyCode;
        console.log(key);

        if (key == 115) {
        // up arrow
        console.log("Key pressed");
        player.ydir += 32;
        player.direction = "up";
        collisionDetect(player.direction);
        }
        else if (key == 119) {
            // down arrow
            console.log("Key pressed");
            player.ydir -= 32;
            player.direction = "down";
            collisionDetect(player.direction);
        }
        else if (key == 97) {
           // left arrow
           console.log("Key pressed");
           player.xdir -= 32;
           player.direction = "left";
           collisionDetect(player.direction);
        }
        else if (key == 100) {
           // right arrow
           console.log("Key pressed");
           player.xdir += 32;
           player.direction = "right";
           collisionDetect(player.direction);
        } else {
            return 1;
        }
})




main();

1 个答案:

答案 0 :(得分：1)

我不明白你所反映的董事会是什么意思。无论map包含什么内容都会在我的屏幕上呈现。

首先，应手动分配画布宽度和高度：

function render(){
    var field = document.getElementById("draw");
    var ctx = field.getContext("2d");
    field.height = TILE_HEIGHT*map.length;
    field.width = TILE_WIDTH*map[0].length;
    renderField();
    renderPlayer();
}

我更新了您的密钥检测功能以注册箭头键（必须使用onkeydown）。请注意，y坐标是从Canvas的左上角计算的。

window.onkeydown = function (eventObject) {
    var key = eventObject.keyCode;
    if (key == 38) {
        // up arrow
        console.log("Key pressed");
        player.ydir -= 32;
        player.direction = "up";
        collisionDetect(player.direction);
    }
    else if (key == 40) {
        // down arrow
        console.log("Key pressed");
        player.ydir += 32;
        player.direction = "down";
        collisionDetect(player.direction);
    }
    else if (key == 37) {
       // left arrow
       console.log("Key pressed");
       player.xdir -= 32;
       player.direction = "left";
       collisionDetect(player.direction);
    }
    else if (key == 39) {
       // right arrow
       console.log("Key pressed");
       player.xdir += 32;
       player.direction = "right";
       collisionDetect(player.direction);
    }
    else {
        return 1;
    }
};

collisionDetect函数中有两个错误：

  1. 分配而不是比较if(direction = "up" &&...)
  2. 缺少向下方向的除法运算符(player.xdir32)

    3. 这是固定功能：

    function collisionDetect(direction){

    if(direction == "up" && map[(player.ydir/32)][(player.xdir/32)] == 0){
        player.y = player.ydir; //up    
        console.log("moved up");


    } else if(direction == "down" && map[(player.ydir/32)][(player.xdir/32)] == 0){
        player.y = player.ydir; //down
        console.log("moved down");


    } else if(direction == "left" && map[player.ydir/32][(player.xdir/32)] == 0){
        player.x = player.xdir; //left
        console.log("moved left");

    } else if(direction == "right" && map[player.ydir/32][(player.xdir/32)] == 0){
        player.x = player.xdir; //right
        console.log("moved right ");
    } 

    player.xdir = player.x;
    player.ydir = player.y;
}

    瞧！运动和墙壁碰撞在各个方向都有效。

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