c++ - 从网格中选定的图 block 绘制大矩形

Question

我有一个二维 map 网格系统。当我在一个图 block 上按住鼠标并将鼠标移动到其他图 block 时，我想绘制更大的矩形，其中第一个图 block 作为一个角，当前图 block 作为更大绘制矩形的另一个角。

目前我有以下内容，但它只是一团糟并且还在不断增长。必须有更简单的方法来做到这一点。请注意，在我将鼠标放在一个图 block 上之后，我可以向上/向下/向左/向右移动以制作矩形。我的大脑被炸毁了，无法将其分解为我所知道的更少的代码。

if (startBuyTile.col < mposTile.col)
                {
                    // use startBuyTile as top/left
                    // use current tile as bottom/right
                    int i = 0;

                    Vec2 spos = TileToWorldCoords(startBuyTile.row, startBuyTile.col);
                    spos.x = spos.x / 100;
                    spos.y = spos.y / 100;

                    if (startBuyTile.row < mposTile.row)
                    {
                        topLeft.x = spos.x - .64;
                        topLeft.y = 0;
                        topLeft.z = spos.y + .64;

                        bottomRight.x = pos.x + .64;
                        bottomRight.y = 0;
                        bottomRight.z = pos.y - .64;

                        topRight.x = spos.x + .64 + (1.28 * Math::Abs(colCount));
                        topRight.y = 0;
                        topRight.z = spos.y + .64;

                        bottomLeft.x = spos.x - .64;
                        bottomLeft.y = 0;
                        bottomLeft.z = pos.y - .64;
                    }
                    else if (startBuyTile.row > mposTile.row)
                    {
                        topLeft.x = pos.x - .64;
                        topLeft.y = 0;
                        topLeft.z = pos.y + .64;

                        topRight.x = spos.x + .64;
                        topRight.y = 0;
                        topRight.z = pos.y + .64;

                        bottomLeft.x = pos.x + .64;
                        bottomLeft.y = 0;
                        bottomLeft.z = spos.y - .64;

                        bottomRight.x = spos.x - .64;
                        bottomRight.y = 0;
                        bottomRight.z = spos.y - .64;
                    }
                    else
                    {
                        topLeft.x = spos.x - .64;
                        topLeft.y = 0;
                        topLeft.z = spos.y + .64;

                        bottomRight.x = pos.x + .64;
                        bottomRight.y = 0;
                        bottomRight.z = pos.y - .64;

                        topRight.x = pos.x + .64;
                        topRight.y = 0;
                        topRight.z = pos.y + .64;

                        bottomLeft.x = spos.x - .64;
                        bottomLeft.y = 0;
                        bottomLeft.z = spos.y - .64;
                    }
                }
                else if (startBuyTile.col > mposTile.col)
                {
                    // use current tile as top/left
                    // use startBuyTile as bottom/right
                    int j = 0;
                }
                else
                {
                    topLeft.x = pos.x - .64;
                    topLeft.y = 0;
                    topLeft.z = pos.y + .64;

                    topRight.x = pos.x + .64;
                    topRight.y = 0;
                    topRight.z = pos.y + .64;

                    bottomLeft.x = pos.x - .64;
                    bottomLeft.y = 0;
                    bottomLeft.z = pos.y - .64;

                    bottomRight.x = pos.x + .64;
                    bottomRight.y = 0;
                    bottomRight.z = pos.y - .64;
                }
            }
            else
            {
                topLeft.x = pos.x - .64;
                topLeft.y = 0; 
                topLeft.z = pos.y + .64;

                topRight.x = pos.x + .64; 
                topRight.y = 0; 
                topRight.z = pos.y + .64;

                bottomLeft.x = pos.x - .64; 
                bottomLeft.y = 0; 
                bottomLeft.z = pos.y - .64;

                bottomRight.x = pos.x + .64; 
                bottomRight.y = 0; 
                bottomRight.z = pos.y - .64;
            }

Answer 1

我想通了。在起始图 block 和我当前所在的图 block 之间，我需要在它们之间获得最低的行/列和最高的行/列，这将给我我的角落，从中我可以得到我的左上/右和左下/右点来制作我的矩形。

我使用 min() 和 max() 来获取这些角 block 。