AS3 Juming/Gravity 问题答案

【问题标题】：AS3 Juming/Gravity issueAS3 Juming/Gravity 问题
【发布时间】：2013-01-16 19:25:23
【问题描述】：

我遇到的问题是我不知道如何让角色停止跳跃。

例如，当我不断地击中空间时，它会不停地跳跃。当我按下空格键时，我希望它跳跃，而当 MC 跳跃时，我想禁用空格键（或者如果可能的话，你能告诉我如何禁用MouseEvents），以便在空中时 MC 只能跳跃一次.

var gravity = 0.8;
var floor = 251;
player.y = floor;
player.speedY = 0;
player.impulsion = 10;
stage.addEventListener(Event.ENTER_FRAME, enterframe);
function enterframe(e:Event) {
    player.speedY += gravity;
    player.y += player.speedY;
    if(player.y > floor) {
        player.speedY = 0;
        player.y = floor

    }

}
stage.addEventListener(KeyboardEvent.KEY_DOWN, space);
function space(e:KeyboardEvent) {
    if(e.keyCode == Keyboard.SPACE) {
        player.speedY = -player.impulsion
    }
}

【问题讨论】：

标签： actionscript-3 movieclip gravity

【解决方案1】：

我通常只有一个布尔变量，如“onFloor”，当图层着陆时设置为真，当他们跳跃时设置为假。然后只有当他们是onFloor时才让他们跳。所以在这里我在你的if(player.y > floor)中设置为true，在if(e.keyCode == Keyboard.SPACE && onFloor)之后设置为false：

var gravity = 0.8;
var floor = 251;
var onFloor:Boolean = false;

player.y = floor;
player.speedY = 0;
player.impulsion = 10;
stage.addEventListener(Event.ENTER_FRAME, enterframe);
function enterframe(e:Event) {
    player.speedY += gravity;
    player.y += player.speedY;
    if(player.y > floor) {
        player.speedY = 0;
        player.y = floor;
        onFloor = true;
    }

}
stage.addEventListener(KeyboardEvent.KEY_DOWN, space);
function space(e:KeyboardEvent) {
    if(e.keyCode == Keyboard.SPACE && onFloor) {
        player.speedY = -player.impulsion;
        onFloor = false;
    }
}

【讨论】：