流畅的相机和瓷砖滚动 C++

Question

I have 50 pixel offset on my camera. The screen size is 640x480, and camera with offset is then 690x530; tile is 16x16 pixel. Where x, y is screen's pixel position, terrain is an array of tiles, startTileXinCamera is tile on the most left in x axis on camera, startTileYinCamera is tile on the most left in y axis on camera, tileXinCamera is tile count that covered by camera in x axis, tileYinCamera is tile count that covered by camera in y axis, tileCountX is total tile count on x axis, not on screen but total for the terrain.

我在 2D 环境中遇到相机和图块滚动的问题。所以，基本上我想按像素平滑地滚动我的图块，但它按图块滚动并且看起来 "laggy" 或卡顿。

这是我的瓦片渲染代码：

void Terrain::render(SDL_Renderer* renderer, Camera* camera)
{
    int x = 0, y = 0;
    int startTileXinCamera = camera->getCamera()->x / tileWidth;
    int startTileYinCamera = camera->getCamera()->y / tileHeight;
    int tileXinCamera = camera->cameraSizeToPositionX() / tileWidth;
    int tileYinCamera = camera->cameraSizeToPositionY() / tileHeight;

    for (int i = startTileYinCamera; i < tileYinCamera; i++)
    {
        for (int j = startTileXinCamera; j < tileXinCamera; j++)
        {
            terrainGraphic->render(renderer, x, y, tileClip[terrain[i * tileCountX + j]->type]);
            if (x < camera->getCamera()->w)
                x += tileWidth;
        }
        x = 0;
        if (y < camera->getCamera()->h)
            y += tileHeight;
    }
}

问题：

如何按像素平滑地滚动我的图块并消除不需要的效果？

Answer 1

我想通了。我正在使用预定义的 x,y 坐标 int x = 0, y = 0;和 x += tileWidth；放置图块，而不是实际使用图块的坐标。然后通过将图块提取到相机位置来计算图块的坐标，因此它会根据屏幕坐标正确渲染。我希望这不会造成混淆。这是代码，以防万一它可能对那里的人有用。对不起，代码很难看。

void Terrain::render(SDL_Renderer* renderer, Camera* camera)
{
    int startTileXinCamera = camera->getCamera()->x / tileWidth;
    int startTileYinCamera = camera->getCamera()->y / tileHeight;
    int tileXinCamera = camera->cameraSizeToPositionX() / tileWidth;
    int tileYinCamera = camera->cameraSizeToPositionY() / tileHeight;

    for (int i = startTileYinCamera; i < tileYinCamera; i++)
    {
        for (int j = startTileXinCamera; j < tileXinCamera; j++)
        {
            terrainGraphic->render(renderer, 
                terrain[i * tileCountX + j]->x - camera->getCamera()->x, 
                terrain[i * tileCountX + j]->y - camera->getCamera()->y, 
                tileClip[terrain[i * tileCountX + j]->type]);
        }
    }
}

流畅的相机和瓷砖滚动 C++

smooth camera and tile scrolling c++

c++

sdl

问题：