Ich erstelle ein Javascript-Spiel, wo ich eine Kollision zwischen dem Ball und dem Rechteck brauche, um einen Reset des Spiels auszulösen. Momentan habe ich nur eine Warnung für Testzwecke. Ich habe Probleme mit der Kollisionserkennung.Kollisionserkennung zwischen Kreis und Rechteck in Javascript Spiel?
Das ist, was ich so weit gekommen, aber es funktioniert nicht
function startGame() {
keeper = new obstacle(40, 20, "#666", 130, 180);
theBall = new component("#000", 80, 10);
myGameArea.start();
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 300;
this.canvas.height = 250;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function(e) {
myGameArea.key = e.keyCode;
})
window.addEventListener('keyup', function(e) {
myGameArea.key = false;
})
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
function component(color, x, y, type) {
this.type = type;
this.speed = 1.5;
this.angle = 0;
this.x = x;
this.y = y;
this.update = function() {
ctx = myGameArea.context;
ctx.save();
ctx.translate(this.x, this.y);
ctx.rotate(this.angle);
ctx.beginPath();
ctx.arc(this.x, this.y, 10, 0, 2 * Math.PI);
ctx.fillStyle = color;
ctx.fill();
ctx.restore();
}
this.newPos = function() {
this.x -= this.speed * Math.sin(this.angle);
this.y += this.speed * Math.cos(this.angle);
}
}
function obstacle(width, height, color, x, y) {
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.update = function() {
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
this.newPos = function() {
this.x += this.speedX;
this.y += this.speedY;
}
this.collideWith = function(theBall){
var collide = true;
var myTop =this.y;
var theBallBottom = theBall.y + (theBall.radius)
if (myTop < theBallBottom)
{
collide = false;
}
return collide;
}
}
function updateGameArea() {
if (keeper.crashWith(theBall)) {
alert("Collision");
} else {
myGameArea.clear();
theBall.newPos();
theBall.update();
keeper.speedX = 0;
keeper.speedY = 0;
if (myGameArea.key && myGameArea.key == 37) {keeper.speedX = -1; }
if (myGameArea.key && myGameArea.key == 39) {keeper.speedX = 1; }
keeper.newPos();
keeper.update();
}
}
Das Spiel hier http://alexhollingsworth.co.uk/game.php
Haben Sie diesen Beitrag ansehen [http://stackoverflow.com/questions/21089959/detecting-collision-of-rectangle-with-circle](http://stackoverflow.com/questions/21089959/detecting- Kollision-von-Rechteck-mit-Kreis)? –