c++ - 动画问题？

Question

现在，当我开始我的游戏时，我正在用 C++ 制作我向左向右向上或向下行走。但是角色只是滑动，看起来不像他在走路。我已经将所有图片加载到我的游戏中，它们正在工作..但我不知道如何解决它..我想不通的是当你按住按钮时如何改变图片..

顺便说一句，这是快板..

这是我的绘图播放器代码:

void Player::Draw(BITMAP *Buffer){
    draw_sprite(Buffer, Oskar[picNumber], x, y);
}

Oskar[] 是包含所有图片的数组的名称..

这是当您按下按钮时角色图片发生变化的原因:

void Player::Controls(){

if(key[KEY_RIGHT]){
    velocityX = speed;
    picNumber = 6;
}

else if(key [KEY_LEFT]){
    velocityX = -speed;
    picNumber = 9;
}

else{
    velocityX = 0;
}

if(key [KEY_UP]){
    velocityY = -speed;
    picNumber = 3;
}
else if(key [KEY_DOWN]){
    velocityY = speed;
    picNumber = 0;
}
else{
    velocityY = 0;
}

x += velocityX;
y += velocityY;
}

这都是关于我创建的变量 picNumber.. 我拥有的所有图片都在一个数组中，picNumber 代表要绘制的图片..很高兴在这方面得到一些帮助。我整天都在想这个问题。

编辑

#include "Player.h"
#include "Global.h"
#include <allegro.h>


Player::Player(){

}


Player::~Player(){

}

void Player::Init(){
        x = 10;
        y = 10;
        velocityX = 0;
        velocityY = 0;
        speed = 1;
        picNumber = x % MAXPICS;

        OskarFront[0] = load_bitmap("Character\\OskarFront.bmp", NULL);
        OskarFront[1] = load_bitmap("Character\\OskarStanding.bmp", NULL);
        OskarFront[2] = load_bitmap("Character\\OskarFront2.bmp", NULL);

        OskarBack[0] = load_bitmap("Character\\OskarBack.bmp", NULL);
        OskarBack[1] = load_bitmap("Character\\OskarStandingBack.bmp", NULL);
        OskarBack[2] = load_bitmap("Character\\OskarBack2.bmp", NULL);

        OskarRight[0] = load_bitmap("Character\\Oskar1.bmp", NULL);
        OskarRight[1] = load_bitmap("Character\\Oskar.bmp", NULL);
        OskarRight[2] = load_bitmap("Character\\Oskar2.bmp", NULL);

        OskarLeft[0] = load_bitmap("Character\\OskarLeft.bmp", NULL);
        OskarLeft[1] = load_bitmap("Character\\OskarLeftStand.bmp", NULL);
        OskarLeft[2] = load_bitmap("Character\\OskarLeft2.bmp", NULL);
}

void Player::Update(){
        Player::Controls();
}

void Player::Draw(BITMAP *Buffer){

        if(walkingRight == true){
                draw_sprite(Buffer, OskarRight[picNumber], x, y);
        }

        else if(walkingLeft == true){
                draw_sprite(Buffer, OskarLeft[picNumber], x, y);
        }

        else if(walkingFront == true){
                draw_sprite(Buffer, OskarFront[picNumber], x, y);
        }

        else if(walkingBack == true){
                draw_sprite(Buffer, OskarBack[picNumber], x, y);
        }

        else{
                draw_sprite(Buffer, OskarFront[1], x, y);
        }
}

void Player::Controls(){

        if(key[KEY_RIGHT]){
                velocityX = speed;
                walkingRight = true;
        }

        else if(key [KEY_LEFT]){
                velocityX = -speed;
                walkingLeft = true;
        }

        else{
                walkingRight = false;
                walkingLeft = false;
                velocityX = 0;
        }

        if(key [KEY_UP]){
                velocityY = -speed;
                walkingFront = true;
        }
        else if(key [KEY_DOWN]){
                velocityY = speed;
                walkingBack = true;
        }
        else{
                velocityY = 0;
                walkingFront = false;
                walkingBack = false;
        }

        x += velocityX;
        y += velocityY;
}

现在这里是我在这里获得帮助后输入的新的完整代码。当我走上去显示前面的图片和走下上面的图片时，它现在不工作了。但是左右工作。也它不会像动画一样改变图片..

Answer 1

每个运动方向只有一个索引!

假设您绘制了大约 3 个(左腿向前、重叠、右腿向前)，您需要随着行进的进行随时间或运动增加索引。

有趣的是 Allegro 取得了多远的进步 - 十年前它主要是 DOS 图形(我将它与 DJGPP 一起使用)并且有来自住在伦敦公寓的作者的笔记。 我的想法多么简朴，直到现在我才明白我们外省人的价格与伦敦的价格相差多少。

在回答您的评论时，尝试这样的事情:

#define MAXPICS 3
BITMAP *OskarWalksLeft[MAXPICS];
BITMAP *OskarWalksRight[MAXPICS];
picNumber = x % MAXPICS;
if (facingLeft) {
    draw_sprite(Buffer, OskarWalksLeft[picNumber], x, y);
} else //facingRight
    draw_sprite(Buffer, OskarWalksRight[picNumber], x, y);

或者如果您不希望每个像素都有一个新帧，但每 3 个左右尝试更换一次

picNumber = x % MAXPICS;

与

picNumber = (x / 3)  % MAXPICS;

我试过稍微整理一下你的代码并想出这个，我没有快板所以无法测试它:

#include "Player.h"
#include "Global.h"
#include <allegro.h>

Player::Player(){}

Player::~Player(){}

enum playerDir {left, right, front, back, stationary} direction;
BITMAP *Oskar[stationary][3];

void Player::Init(){
    x = 10;
    y = 10;
    velocityX = 0;
    velocityY = 0;
    speed = 1;
    picNumber = x % MAXPICS;

    char filename[256];
    const char *dirStrs[] = {"left","right","front","back"};
    for (playerDir i = left; i < stationary; (int)i = (int)i + 1)
        for (j = 0; j < 3; ++j) {
            strcpy(filename, "Character\\Oskar");
            strcat(filename, dirStrs[i]);
            strcat(filename, itoa(j));
            strcat(filename, ".bmp");
            Oskar[i][j] = load_bitmap(filename, NULL);
        }
}

void Player::Update(){Player::Controls();}
void Player::Draw(BITMAP *Buffer){
    switch (direction) {
        case left :
                draw_sprite(Buffer, OskarLeft[picNumber], x, y);
                break;
        case right :
                draw_sprite(Buffer, OskarRight[picNumber], x, y);
                break;
        case front :
                draw_sprite(Buffer, OskarFront[picNumber], x, y);
                break;
        case back :
                draw_sprite(Buffer, OskarBack[picNumber], x, y);
                break;
        default:
                draw_sprite(Buffer, OskarFront[1], x, y);
        }
}

void Player::Controls(){
    direction = stationary;
    if(key[KEY_RIGHT]){
        velocityX = speed;
        direction = right;
    } else if(key [KEY_LEFT]){
        velocityX = -speed;
        direction = left;
    } else velocityX = 0;

    if(key [KEY_UP]){
        velocityY = -speed;
        direction = front;
    } else if(key [KEY_DOWN]){
        velocityY = speed;
        direction = back;
    } else velocityY = 0;

    x += velocityX;
    y += velocityY;
 }