CODEWITHSUNDEEP
c#winformspicturebox
チーズパン
チーズパン

Reputation: 2778

PictureBox does not show Grid drawn in a method

I've got a method CreateGrid():

        public void CreateMyGrid() 
    {
        g = pictureBox1.CreateGraphics();

        for (int c = 0; c < columns; c++)
        {

            for (int r = 0; r < rows; r++)
            {
                g.DrawRectangle(pen1, cellSize * c, cellSize * r, cellSize, cellSize);
                Cell newCell = new Cell(rows * columns, new Vector(c, r));
                newCell.rectangle = new Rectangle(cellSize * c,
                    cellSize * r,
                    cellSize,
                    cellSize);
                gridList.Add(newCell);
            }
        }

        foreach (Cell cell in gridList)
        {
            if (cell.positionCR.X == start.X && cell.positionCR.Y == start.Y)
            {
                g.DrawImage(potato, cell.rectangle.X + 1, cell.rectangle.Y + 1);
            }

            if (cell.positionCR.X == goal.X && cell.positionCR.Y == goal.Y)
            {
                g.DrawImage(cake, cell.rectangle.X + 1, cell.rectangle.Y + 1);
            }
        }

    }

If I call the very same code by Button_Click the grid is drawn. But if I call the method in the constructor like this:

public Form1()
        {
            InitializeComponent();
            CreateMyGrid();            
        }

Nothing happens.

Upvotes: 0

Views: 186

Answers (1)

King King
King King

Reputation: 63347

Try this:

public void CreateMyGrid(Graphics g) 
{
    for (int c = 0; c < columns; c++)
    {

        for (int r = 0; r < rows; r++)
        {
            g.DrawRectangle(pen1, cellSize * c, cellSize * r, cellSize, cellSize);
            Cell newCell = new Cell(rows * columns, new Vector(c, r));
            newCell.rectangle = new Rectangle(cellSize * c,
                cellSize * r,
                cellSize,
                cellSize);
            gridList.Add(newCell);
        }
    }

    foreach (Cell cell in gridList)
    {
        if (cell.positionCR.X == start.X && cell.positionCR.Y == start.Y)
        {
            g.DrawImage(potato, cell.rectangle.X + 1, cell.rectangle.Y + 1);
        }

        if (cell.positionCR.X == goal.X && cell.positionCR.Y == goal.Y)
        {
            g.DrawImage(cake, cell.rectangle.X + 1, cell.rectangle.Y + 1);
        }
    }

}

private void pictureBox1_Paint(object sender, PaintEventArgs e){
     CreateMyGrid(e.Graphics);
}

Upvotes: 2

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