Draw Pie for 2 Scroll Bars
Start a new project. Add scroll bars hsbStart and hsbDegrees.
Set the properties so that you can select any integer value from 0 to 360.
Add labels lblInfo1, lblInfo2 and lblStart and lblDegrees as shown.
Add this code:
private void DrawGraph()
{
// Get the graphics of the form.
Graphics g = this.CreateGraphics();
// Create a Black Brush for background.
SolidBrush myBrushBackground = new SolidBrush(Color.Black);
// Create a Red Brush for foreground.
SolidBrush myBrushForeground = new SolidBrush(Color.Red);
// We want to draw the pie under the 2nd scroll bar.
int top = hsbDegrees.Location.Y + hsbDegrees.Height + 10;
// Create a rectangle 200x200 (square) for the circle.
Rectangle myRect = new Rectangle(10, top, 200, 200);
g.FillPie(myBrushBackground, myRect, 0, 360);
g.FillPie(myBrushForeground, myRect, hsbStart.Value, hsbDegrees.Value);
}
private void hsbStart_Scroll(object sender, ScrollEventArgs e)
{
// Display start value and draw pie
lblStart.Text = hsbStart.Value.ToString();
DrawGraph();
}
private void hsbDegrees_Scroll(object sender, ScrollEventArgs e)
{
// Display degrees value and draw pie
lblDegrees.Text = hsbDegrees.Value.ToString();
DrawGraph();
}
To Do: Experiment! Try using 2 scroll bars to select rent and food. Use the pie to show which percentage each item is,