Actionscript 3 as3非均匀地形的坡度检测

我想创建一个2d游戏，其中一辆汽车沿着不规则形状的山的边缘移动。我想使用基本as3（没有像Box2d或Nape这样的物理引擎）。通过大量的研究，我找到了我想要的东西，但只有逻辑，没有源代码。有人能帮我用一段代码在as3中实现这一点吗？还建议是否有更好的替代方案来获得所需的输出。

我自己对这样的代码不太了解，我不能发表评论，因为我缺少7个声誉：'（但是你链接的文章确实有另一个指向蠕虫类程序的链接，其中的代码可能对你有所帮助。一个指向该网站的链接，我还将提供一些适当的代码，你可以查看它是否对你有用。）

所以这个程序有一个监听器，如果任何键是向下的，它会将布尔值设置为true，如果它是你的程序正在使用的键（移动、跳跃空间或其他），监听器看起来是这样的

    public function key_down(e:KeyboardEvent) {
        if (e.keyCode==37) {
            left_key=true;
        }
        if (e.keyCode==39) {
            right_key=true;
        }
        if (e.keyCode==32) {
            space_key=true;
        }
    }

然后，当一个键被释放时，它有一个后续的侦听器

    public function key_up(e:KeyboardEvent) {
        if (e.keyCode==37) {
            left_key=false;
        }
        if (e.keyCode==39) {
            right_key=false;
        }
        if (e.keyCode==32) {
            space_key=false;
        }
    }

最后，stage有一个ENTER_FRAME侦听器，用于移动运行此函数的角色

    public function move_character(e:Event) {
        //If left key is pressed, we'll move the character to the left
        if (left_key) {
            for (i=0; i<3; i++) {//Do you remember when we made the character fall? We had to move the character pixel by pixel
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-6,character.y-10,1,17))) {
                    character.x--;  /*If the character doesn't hit the ground, we can move left. However,
                                    the character may be sunk under the ground. We have to lift it*/
                    while (terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                        character.y--;
                    }
                }
            }
        }
        if (right_key) {//Well, that's the same for the right key
            for (i=0; i<3; i++) {
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x+5,character.y-10,1,17))) {
                    character.x++;
                    while (terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                        character.y--;
                    }
                }
            }
        }
        if (space_key&&! jumping) {//That's easy: if he isn't jumping and you press space, his speed will be negative and he'll jump
            character_speed=-10;
            jumping=true;//Now the character can't jump again
        }

        character_speed++;//Every frame we will increase character's speed
        if (character_speed>0) {
            //If the speed is positive, we will check a collision between the terrain and the rectangle below the character
            for (i=0; i<character_speed; i++) {//We check the collision pixel by pixel...
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                    character.y++;//If there isn't a collision, the character will fall
                } else {
                    jumping=false;//If there's a collision with the ground, the character isn't jumping
                    character_speed=0;//The speed is 0, because the character hit the ground
                }
            }
        } else {
            for (i=0; i<Math.abs(character_speed); i++) {//If the speed is negative, the for loop won't work. We have to use Math.abs().
            //Now we will check the collision between the terrain and the rectangle above the character
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y-10,10,1))) {
                    character.y--;
                } else {
                    character_speed=0;//Well, that's the same: the character hit the ground
                }
            }
        }
    }

公共函数移动字符（e:事件）{
//如果按左键，我们将向左移动角色
如果（左键）{
对于（i=0；i我自己对这样的代码没有太多的了解，我不能发表评论，因为我缺少7个声誉：'（但是你链接的文章确实有另一个指向蠕虫类程序的链接，其中的代码可能对你有所帮助。一个指向该网站的链接，我还将提供一些适当的代码，你可以查看它是否对你有用。）

所以这个程序有一个监听器，如果任何键是向下的，它会将布尔值设置为true，如果它是你的程序正在使用的键（移动、跳跃空间或其他），监听器看起来是这样的

    public function key_down(e:KeyboardEvent) {
        if (e.keyCode==37) {
            left_key=true;
        }
        if (e.keyCode==39) {
            right_key=true;
        }
        if (e.keyCode==32) {
            space_key=true;
        }
    }

然后，当一个键被释放时，它有一个后续的侦听器

    public function key_up(e:KeyboardEvent) {
        if (e.keyCode==37) {
            left_key=false;
        }
        if (e.keyCode==39) {
            right_key=false;
        }
        if (e.keyCode==32) {
            space_key=false;
        }
    }

最后，stage有一个ENTER_FRAME侦听器，用于移动运行此函数的角色

    public function move_character(e:Event) {
        //If left key is pressed, we'll move the character to the left
        if (left_key) {
            for (i=0; i<3; i++) {//Do you remember when we made the character fall? We had to move the character pixel by pixel
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-6,character.y-10,1,17))) {
                    character.x--;  /*If the character doesn't hit the ground, we can move left. However,
                                    the character may be sunk under the ground. We have to lift it*/
                    while (terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                        character.y--;
                    }
                }
            }
        }
        if (right_key) {//Well, that's the same for the right key
            for (i=0; i<3; i++) {
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x+5,character.y-10,1,17))) {
                    character.x++;
                    while (terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                        character.y--;
                    }
                }
            }
        }
        if (space_key&&! jumping) {//That's easy: if he isn't jumping and you press space, his speed will be negative and he'll jump
            character_speed=-10;
            jumping=true;//Now the character can't jump again
        }

        character_speed++;//Every frame we will increase character's speed
        if (character_speed>0) {
            //If the speed is positive, we will check a collision between the terrain and the rectangle below the character
            for (i=0; i<character_speed; i++) {//We check the collision pixel by pixel...
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y+9,10,1))) {
                    character.y++;//If there isn't a collision, the character will fall
                } else {
                    jumping=false;//If there's a collision with the ground, the character isn't jumping
                    character_speed=0;//The speed is 0, because the character hit the ground
                }
            }
        } else {
            for (i=0; i<Math.abs(character_speed); i++) {//If the speed is negative, the for loop won't work. We have to use Math.abs().
            //Now we will check the collision between the terrain and the rectangle above the character
                if (! terrain_bmpd.hitTest(new Point(terrain_bmp.x,terrain_bmp.y),0x01,new Rectangle(character.x-5,character.y-10,10,1))) {
                    character.y--;
                } else {
                    character_speed=0;//Well, that's the same: the character hit the ground
                }
            }
        }
    }

公共函数移动字符（e:事件）{
//如果按左键，我们将向左移动角色
如果（左键）{
对于（i=0；i