Question

I need to draw a grid with Graphics class (just crossed lines), and a transparent representation like this picture:

I don’t know any other way than draw every line/rectangle. The performance is bad if the field is wide. Is there any better way to draw these things?

Here is my current code to draw the grid:

    private void drawGrid(Graphics pGraphic, int pGridSize)
    {
        int verticalCount = this.mPicScreen.Width / pGridSize + 1;
        int horizontalCount = this.mPicScreen.Height / pGridSize + 1;

        Pen p = new Pen(Color.Gray);

        // Vertical Lines
        for (int i = 0; i < verticalCount; i++)
        {
            pGraphic.DrawLine(p,
                new Point(i * pGridSize, 0),
                new Point(i * pGridSize, this.mPicScreen.Height));
        }

        // Horizontal Lines
        for (int i = 0; i < horizontalCount; i++)
        {
            pGraphic.DrawLine(p,
                new Point(0, i * pGridSize),
                new Point(this.mPicScreen.Width, i * pGridSize));
        }
    }

Answer 1

there is a better way: just use a brush

if you need to make a user defined grid size, you can use

System.Drawing.TextureBrush 

if a random one is ok, you find in

System.Drawing.Drawing2D.HatchBrush 

already a grid style