如何在闪光灯中沿旋转方向移动物体？

Question

我有一个 "car" 必须按照它旋转的方向移动。现在它只是朝一个方向旋转并继续上升，down.Please 帮助我。我正在使用 adobe flash pro cs6 和 actionscript3。我的代码是：

var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;

car.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed);

function fl_MoveInDirectionOfKey(event:Event)
{
    if (upPressed)
    {
        car.y += 5;
    }
    if (downPressed)
    {
        car.y -= 5;
    }
    if (rightPressed)
    {
        car.rotation += 5;
    }
    if (leftPressed)
    {
        car.rotation -= 5;
    }
}

function fl_SetKeyPressed(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.UP:
        {
            upPressed = true;
            break;
        }
        case Keyboard.DOWN:
        {
            downPressed = true;
            break;
        }
        case Keyboard.LEFT:
        {
            leftPressed = true;
            break;
        }
        case Keyboard.RIGHT:
        {
            rightPressed = true;
            break;
        }
    }
}

function fl_UnsetKeyPressed(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.UP:
        {
            upPressed = false;
            break;
        }
        case Keyboard.DOWN:
        {
            downPressed = false;
            break;
        }
        case Keyboard.LEFT:
        {
            leftPressed = false;
            break;
        }
        case Keyboard.RIGHT:
        {
            rightPressed = false;
            break;
        }
    }
}

Answer 1

您需要使用vector math根据角度和距离移动小车的x,y。

例如，您可以根据这样的角度和速度移动您的汽车：

function move(degrees:Number, speed:Number):void {
    var radians:Number = degrees * (Math.PI / 180);
    car.x += Math.cos(radians) * speed;
    car.y += Math.sin(radians) * speed;
}

那么你可以用小车的rotation作为角度，5或-5作为速度：

if (upPressed) {
    move(car.rotation, 5);
}
if (downPressed) {
    move(car.rotation, -5);
}

请注意，这假设 rotation=0 意味着您的汽车朝向右侧。如果您将汽车朝向不同的方向绘制，则需要补偿绘制汽车的角度，例如，如果汽车朝上，则需要使用 move(car.rotation - 90, 5).

如何在闪光灯中沿旋转方向移动物体？

How to move object in the direction of rotation in flash?

flash

actionscript-3