MonoGame - 获取光标在相对于矩阵的世界中的网格单元位置

问题描述

我只是在编写我的游戏，我一直在获取单元格位置。 我需要获取光标所在的单元格位置，并且所有内容都是相对于相机矩阵绘制的。

我尝试了很多事情 - 用 Vector2 位置、矩阵本身做了很多事情，但我一无所获。

感谢任何帮助。

尝试获取网格单元格位置的代码：

                    // Getting view matrix
                    var viewMatrix = cam.GetTransform();
                    Vector2 worldPosition = Vector2.Transform(mouse.Position.ToVector2(),Matrix.Invert(viewMatrix));

                    // Getting the grid cell position where cursor is
                    int width = 80;
                    int height = 80;
                    int size = 64;

                    for (int forX = 0; forX < width; forX++)
                    {
                        for (int forY = 0; forY < height; forY++)
                        {
                            int mouseXmin = (size * forX) + 1;
                            int mouseXmax = mouseXmin + 63;
                            int mouseYmin = (size * forY) + 1;
                            int mouseYmax = mouseYmin + 63;

                            Vector2 minVector = Vector2.Transform(new Vector2(mouseXmin,mouseYmin),Matrix.Invert(viewMatrix));
                            Vector2 maxVector = Vector2.Transform(new Vector2(mouseXmax,mouseYmax),Matrix.Invert(viewMatrix));

                            if (worldPosition.X > minVector.X && worldPosition.X < maxVector.X
                                && worldPosition.Y > minVector.Y && worldPosition.Y < maxVector.Y)
                            {
                                // Some debug stuff,this is where I got that it does not work beacuse of matrix magic
                                spriteBatch.Begin(SpriteSortMode.Deferred,BlendState.NonPremultiplied,null,viewMatrix);
                                debugRectangle = new Rectangle((int)minVector.X,(int)minVector.Y,(int)maxVector.X,(int)maxVector.Y);
                                spriteBatch.End();
                            }
                        }
                    }

绘图代码：

            // Getting view matrix
            var viewMatrix = cam.GetTransform();

            spriteBatch.Begin(SpriteSortMode.Deferred,viewMatrix);

            // Drawing grid
            for (float x = 0; x < 80; x++)
            {
                int length = 64 * 79;
                Rectangle rectangle = new Rectangle((int)(64 * x),1,length);
                spriteBatch.Draw(px,rectangle,Color.White);
            }

            for (float y = 0; y < 80; y++)
            {
                int length = 64 * 79;
                Rectangle rectangle = new Rectangle(0,(int)(64 * y),length,1);
                spriteBatch.Draw(px,Color.White);
            }

            // Drawing blocks
            for (int forX = 0; forX < 80; forX++)
            {
                for (int forY = 0; forY < 80; forY++)
                {
                    Block block = blocks[forX,forY];
                    if (block == null) continue;
                    int x = (64 * forX) + (1 * (forX + 1));
                    int y = (64 * forY) + (1 * (forX + 1));
                    switch (block.type)
                    {
                        case Block.BlockType.AND:
                            spriteBatch.Draw(and,new Vector2(x,y),Color.White);
                            break;
                        case Block.BlockType.NAND:
                            spriteBatch.Draw(nand,Color.White);
                            break;
                        case Block.BlockType.NOR:
                            spriteBatch.Draw(nor,Color.White);
                            break;
                        case Block.BlockType.NOT:
                            spriteBatch.Draw(not,Color.White);
                            break;
                        case Block.BlockType.NXOR:
                            spriteBatch.Draw(nxor,Color.White);
                            break;
                        case Block.BlockType.OR:
                            spriteBatch.Draw(or,Color.White);
                            break;
                        case Block.BlockType.WIRE:
                            DrawRectangle(new Rectangle(x + 15,y + 15,35,35),Color.Black);
                            if (block.active) DrawFilledRectangle(new Rectangle(x + 17,y + 17,31,31),Color.Green);
                            else DrawFilledRectangle(new Rectangle(x + 17,33,33),Color.Red);
                            break;
                        case Block.BlockType.XOR:
                            spriteBatch.Draw(xor,Color.White);
                            break;
                    }
                }
            }

            spriteBatch.End();

相机：

    public class Camera
    {
        public Camera()
        {
            Zoom = 1;
            Position = Vector2.Zero;
            Rotation = 0;
            Origin = Vector2.Zero;
            Position = Vector2.Zero;
        }

        public float Zoom { get; set; }
        public Vector2 Position { get; set; }
        public float Rotation { get; set; }
        public Vector2 Origin { get; set; }

        public void Move(Vector2 direction)
        {
            Position += direction;
        }

        public Matrix GetTransform()
        {
            var translationMatrix = Matrix.CreateTranslation(new Vector3(Position.X,Position.Y,0));
            var rotationMatrix = Matrix.CreateRotationZ(Rotation);
            var scaleMatrix = Matrix.CreateScale(new Vector3(Zoom,Zoom,1));
            var originMatrix = Matrix.CreateTranslation(new Vector3(Origin.X,Origin.Y,0));

            return translationMatrix * rotationMatrix * scaleMatrix * originMatrix;
        }
    }

解决方法

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