Javascript落石游戏中的碰撞检测
所以我要为一个大学项目做一个Javascript版本的落石游戏。 玩家控制一个长方形,该长方形应该从左向右移动,而不会被落下的物体击中。到达每一方都会增加分数,而被击中则会降低分数。比赛以0分结束 我似乎被碰撞检测部分卡住了。我试图使用每个对象的坐标作为碰撞的标准,但到目前为止我所得到的并没有任何作用。如果有人能看看我做错了什么,我会非常感激 播放器块的图像大小为x=30px,y=15px,而下落物体的大小为15×15像素 到目前为止的完整代码:Javascript落石游戏中的碰撞检测,javascript,html5-canvas,collision-detection,Javascript,Html5 Canvas,Collision Detection,所以我要为一个大学项目做一个Javascript版本的落石游戏。 玩家控制一个长方形,该长方形应该从左向右移动,而不会被落下的物体击中。到达每一方都会增加分数,而被击中则会降低分数。比赛以0分结束 我似乎被碰撞检测部分卡住了。我试图使用每个对象的坐标作为碰撞的标准,但到目前为止我所得到的并没有任何作用。如果有人能看看我做错了什么,我会非常感激 播放器块的图像大小为x=30px,y=15px,而下落物体的大小为15×15像素 到目前为止的完整代码: //canvas setup var canva
//canvas setup
var canvas = document.createElement("canvas");
canvas.style.background = "white";
canvas.style.height = "95%";
canvas.style.width = "99%";
document.body.appendChild(canvas);
canvas.style.border="1px solid black";
var ctx = canvas.getContext("2d");
// block image
var blockImg = new Image();
var t;
var block=
{
blockSpeed : 0
}
block.x=0;
blockImg.style.height=15;
blockImg.style.width=30;
blockImg.src = "squareche.jpg";
//draw block
blockImg.onload = function()
{
ctx.drawImage(blockImg, block.x,canvas.height-15);
}
function drawBlockProgress(pos)
{
ctx.drawImage(blockImg, block.x, canvas.height-15);
}
//Background image
var bckg = new Image();
bckg.src = "background.png";
function drawBackground()
{
ctx.drawImage(bckg, 0, 0);
}
//score
function drawScore()
{
ctx.font = "14px Times New Roman";
ctx.fillText("Score: " + score, 230, 25);
}
//score, position, and a bool flag for getting points on reaching either end
var score=50;
var pos = 0;
var flag = true;
//left and right keypush event handlers
document.onkeydown = function(event){
if(event.keyCode==39)
{
pos+=10;
block.x=block.blockSpeed+pos;
if(pos>=270)
{
if(flag)
{
flag=!flag;
score+=10;
}
pos=270;
block.x=270;
drawBlockProgress(pos);
}
else
{
drawBlockProgress(pos);
}
}
else if(event.keyCode == 37)
{
pos-=10;
block.x=block.blockSpeed+pos;
if(pos<=0)
{
if(!flag)
{
flag=!flag;
score+=10;
}
pos=0;
block.x=0;
drawBlockProgress(pos);
}
else{
drawBlockProgress(pos);
}
}
}
//set up the falling rocks
var imgRocks;
var x=0;
var y= 0;
var totalRocks = 10;
var rocks=[];
var speed = 0.2;
//generate the falling objects
function draw()
{
for(var i=0;i<totalRocks;i++)
{
drawBackground();
drawBlockProgress(pos);
drawScore();
ctx.drawImage(rocks[i].image, rocks[i].x, rocks[i].y);
rocks[i].y+=rocks[i].speed;
if(rocks[i].y > canvas.height-15)
{
rocks[i].y=-17;
rocks[i].x=Math.floor(Math.random()*300 + 1);
}
//collision check
if(block.x <= (rocks[i].x + 15)
&& rocks[i].x <= (block.x + 30)
&& block.y <= (rocks[i].y + 15)
&& rocks[i].y <= (block.y + 15))
{
// rocks[i].y=-15;
// rocks[i].x=Math.floor(Math.random()*300 + 1);
score -=10;
// if(score == 0)
// {
// break;
// clearInterval(t);
// alert("Game Over Dude !");
// window.close();
// }
}
}
}
function start()
{
for (var i = 0; i < totalRocks; i++) {
var fallingRock = new Object();
fallingRock["image"] = new Image();
rocksImg = new Image();
rocksImg.src = "rocks.jpg";
fallingRock.image.src = rocksImg.src;
fallingRock["x"] = Math.floor(Math.random() * 200 + 1);
fallingRock["y"] = Math.floor(Math.random() * 100 + 1);
fallingRock["speed"] = speed;
rocks.push(fallingRock);
t = setInterval(draw,10);
}
}
start();
//画布设置
var canvas=document.createElement(“canvas”);
canvas.style.background=“白色”;
canvas.style.height=“95%”;
canvas.style.width=“99%”;
document.body.appendChild(画布);
canvas.style.border=“1px纯黑”;
var ctx=canvas.getContext(“2d”);
//块图像
var blockImg=新图像();
变量t;
变量块=
{
块速度:0
}
块x=0;
砌块高度=15;
块样式宽度=30;
blockImg.src=“squareche.jpg”;
//绘图块
blockImg.onload=函数()
{
ctx.drawImage(blockImg,block.x,canvas.height-15);
}
功能进度(pos)
{
ctx.drawImage(blockImg,block.x,canvas.height-15);
}
//背景图像
var bckg=新图像();
bckg.src=“background.png”;
功能缺陷背景()
{
ctx.drawImage(bckg,0,0);
}
//得分
函数drawScore()
{
ctx.font=“14px时代新罗马”;
ctx.fillText(“分数:”+分数,230,25);
}
//得分、位置和到达两端时得分的bool标志
var得分=50;
var-pos=0;
var标志=真;
//左键推送和右键推送事件处理程序
document.onkeydown=函数(事件){
if(event.keyCode==39)
{
pos+=10;
block.x=block.blockSpeed+pos;
如果(位置>=270)
{
国际单项体育联合会(旗)
{
flag=!flag;
分数+=10分;
}
pos=270;
块x=270;
提款进度(pos);
}
其他的
{
提款进度(pos);
}
}
else if(event.keyCode==37)
{
pos-=10;
block.x=block.blockSpeed+pos;
如果(pos这是你的起点
制作一些岩石:
// rock variables
var rockWidth=15;
var rockHeight=15;
var totalRocks = 10;
var rocks=[];
for(var i=0;i<totalRocks;i++){
addRock();
}
function addRock(){
var rock={
width:rockWidth,
height:rockHeight
}
resetRock(rock);
rocks.push(rock);
}
// move the rock to a random position near the top-of-canvas
// assign the rock a random speed
function resetRock(rock){
rock.x=Math.random()*(canvas.width-rockWidth);
rock.y=15+Math.random()*30;
rock.speed=0.2+Math.random()*0.5;
}
// block variables
var blockWidth=30;
var blockHeight=15;
var blockSpeed=10;
var block={
x:0,
y:canvas.height-blockHeight,
width:blockWidth,
height:blockHeight,
blockSpeed:blockSpeed
}
function animate(){
// request another animation frame
if(continueAnimating){
requestAnimationFrame(animate);
}
// for each rock
// (1) check for collisions
// (2) advance the rock
// (3) if the rock falls below the canvas, reset that rock
// redraw everything
}
制作动画循环:
// rock variables
var rockWidth=15;
var rockHeight=15;
var totalRocks = 10;
var rocks=[];
for(var i=0;i<totalRocks;i++){
addRock();
}
function addRock(){
var rock={
width:rockWidth,
height:rockHeight
}
resetRock(rock);
rocks.push(rock);
}
// move the rock to a random position near the top-of-canvas
// assign the rock a random speed
function resetRock(rock){
rock.x=Math.random()*(canvas.width-rockWidth);
rock.y=15+Math.random()*30;
rock.speed=0.2+Math.random()*0.5;
}
// block variables
var blockWidth=30;
var blockHeight=15;
var blockSpeed=10;
var block={
x:0,
y:canvas.height-blockHeight,
width:blockWidth,
height:blockHeight,
blockSpeed:blockSpeed
}
function animate(){
// request another animation frame
if(continueAnimating){
requestAnimationFrame(animate);
}
// for each rock
// (1) check for collisions
// (2) advance the rock
// (3) if the rock falls below the canvas, reset that rock
// redraw everything
}
下面是一个演示:
如果您发送了正确的信息,那么您的碰撞检测代码是很好的。不过,您的代码的其余部分有很多问题(对不起)。哦,那么,欢迎您提供任何开始提示?