Question

我有一个播放器，看起来像这样：

{
   x: [could be any integer],
   y: [could be any integer],
   facing: {
      x: [could be any integer],
      y: [could be any integer]
   }
}

假设玩家处于（player.x，player.y），并且玩家面向鼠标方向，即（player.facing.x，player.facing.y），我可以使用什么公式将玩家移动到鼠标方向的单位？

这是我到目前为止所尝试的内容，但始终会产生null：

var facingDistance = Math.sqrt(Math.pow(game.players[i].facing.x, 2) - Math.pow(game.players[i].x, 2));

game.players[i].x += (game.players[i].speed/facingDistance) *
(game.players[i].x - game.players[i].facing.x);

game.players[i].y += (game.players[i].speed/facingDistance) *
(game.players[i].y - game.players[i].facing.y);

Answer 1

// prefetch player object for cleaner code
var plr = game.players[i];

// normalized player direction
var facingDX = plr.facing.x - plr.x;
var facingDY = plr.facing.y - plr.y;
var facingLen = Math.sqrt(facingDX * facingDX + facingDY * facingDY);
facingDX /= facingLen;
facingDY /= facingLen;

// add n times this to position + round to integer coordinates
plr.x = Math.round(plr.x + facingDX * n);
plr.y = Math.round(plr.y + facingDY * n);

将玩家n个单位移近X点

1 个答案: