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textbox and chart?

hi
im a c#.net newbie.
i started a web application and wondered if its possible
to have a textbox where you could only enter 1-100 and then it would show a pie chart (or bar chart or something similar) with the selected data.

i.e. if you enter 17 the pie chart shows 17 and 83

Thanks
Paul

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Brian Mulder

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amoran

Hi bruintje,

I was able to get the commented code below to work - it draws a rectangle.

But I couldn't seem to see a pie chart when I did the rest?

Thanks
Paul

private void Form1_Paint(object sender, PaintEventArgs pe)
{
//Graphics g = pe.Graphics;
//Pen pn = new Pen(Color.Blue, 100);
//Rectangle rect = new Rectangle(50, 50, 200, 100);
//g.DrawEllipse(pn, rect);

Bitmap bitmap = new Bitmap(10, 10, PixelFormat.Format32bppArgb);
Graphics graphics = Graphics.FromImage(bitmap);

SolidBrush[] brushes = new SolidBrush[2];
brushes[0] = new SolidBrush(Color.Yellow);
brushes[1] = new SolidBrush(Color.Green);

decimal[] vals = { 20, 80 };
// Sum the inputs to get the total
decimal total = 0.0m;
foreach (decimal val in vals)
total += val;

// Draw the pie chart
float start = 0.0f;
float end = 0.0f;
decimal current = 0.0m;
for (int i = 0; i < vals.Length; i++)
{
current += vals[i];
start = end;
end = (float)(current / total) * 360.0f;
graphics.FillPie(brushes[i % 10], 0.0f, 0.0f, 10, 10, start, end - start);
}

// Clean up the brush resources
foreach (SolidBrush cleanBrush in brushes)
cleanBrush.Dispose();

}

amoran

Actually I got this to work

Graphics g = pe.Graphics;

Pen penpiegreen = new Pen(Color.Green, 2);
Pen penpiered = new Pen(Color.Red, 2);
Brush brushpiegreen = new SolidBrush(System.Drawing.Color.Green);
Brush brushpiered = new SolidBrush(System.Drawing.Color.Red);

g.SmoothingMode = SmoothingMode.AntiAlias;

g.DrawPie(penpiegreen, 20, 250, 125, 125, 180, 340);
g.DrawPie(penpiered, 20, 250, 125, 125, 160, 20);
g.FillPie(brushpiegreen, 20, 250, 125, 125, 180, 340);
g.FillPie(brushpiered, 20, 250, 125, 125, 160, 20);