how to draw blank space in winform?

Question

how to draw blank space in winform?

mc 7,231

I am using winform and I want to draw blank space .

I create bitmap and Graphics from it and then draw strings.

the background is #000000 and the brush color is #ffffff and I draw texts is all right.

but I want draw only a blank string.

var text=" " and I want to there is a #ffffff blank in the background how to do it?

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Answer accepted by question author

Nancy Vo (WICLOUD CORPORATION) 7,985 Microsoft External Staff Moderator

Hello @mc ,

Thanks for your question.

Since a space " " is just an empty gap, DrawString won't paint any white pixels into it.

I recommend some workarounds:

Using MeasureString and FillRectangle.

You can measure how big the space would be and then fill that area with White.

You can refer to following code example:

Bitmap bitmap = new Bitmap(400, 100);
using (Graphics g = Graphics.FromImage(bitmap))
{
    g.Clear(Color.Black);

    Font font = new Font("Arial", 16);
    string blankText = " ";
    float x = 50;
    float y = 20;

    SizeF spaceSize = g.MeasureString(blankText, font);

    using (SolidBrush whiteBrush = new SolidBrush(Color.White))
    {
        g.FillRectangle(whiteBrush, x, y, spaceSize.Width, spaceSize.Height);
    }
}

Using TextRenderer.DrawText with background color.

This method lets you set both text color and background color directly.

Bitmap bitmap = new Bitmap(400, 100);
using (Graphics g = Graphics.FromImage(bitmap))
{
    g.Clear(Color.Black);

    Font font = new Font("Arial", 16);
    Point position = new Point(50, 20);

    TextRenderer.DrawText(
        g,
        " ",
        font,
        position,
        Color.White,
        Color.White
    );
}

I hope this addresses your question. If this response was helpful, please consider following the guidance to provide feedback.

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1 additional answer

Your answer

Answer 1

Draw a filled rectangle (or other shape) instead of trying to draw a space character. A space has no visible glyph, so DrawString(" ", ...) will not paint anything.

Example in a Paint handler using GDI+:

private void Form1_Paint(object sender, PaintEventArgs e)
{
    // background is black (#000000)

    // draw a white (#ffffff) blank area  
    using (Brush brush = new SolidBrush(Color.White))
    {
        // choose the position and size of the blank area
        Rectangle rect = new Rectangle(50, 50, 100, 20);
        e.Graphics.FillRectangle(brush, rect);
    }

    // then draw text as usual
    using (Font font = new Font("Times New Roman", 24, FontStyle.Bold, GraphicsUnit.Pixel))
    {
        PointF point = new PointF(50, 80);
        e.Graphics.DrawString("Hello", font, Brushes.White, point);
    }
}

If drawing onto a Bitmap, use the Graphics created from that bitmap in the same way:

using (Graphics g = Graphics.FromImage(bitmap))
using (Brush brush = new SolidBrush(Color.White))
{
    g.FillRectangle(brush, new Rectangle(50, 50, 100, 20));
}

This paints a solid white region on the black background, effectively giving a “blank” white area.

References: