/// <summary>
/// Initialize the backbuffer
/// </summary>
private void InitializePixelMap()
{
PixelMap = new Bitmap(Width, Height);
GraphicsContainer = Graphics.FromImage(PixelMap);
GraphicsContainer.Clear(BackgroundColor);
Refresh();
}
protected override void Redraw()
{
RecalculateThumbBounds();
GraphicsContainer.Clear(BackgroundColor);
float thumbCenter = ValueToPosition(Value);
ThumbBounds.X = (int)(thumbCenter - ThumbBounds.Width / 2f);
int margin = Height - ThumbBounds.Height;
Rectangle visibleBounds = ThumbBounds;
visibleBounds.X += margin / 2;
visibleBounds.Width -= margin;
GraphicsContainer.FillRectangle(ForegroundBrush, visibleBounds);
}
/// <summary>
/// Redraws the scrollbar into the backbuffer.
/// </summary>
protected override void Redraw()
{
RecalculateThumbBounds();
// Clear the buffer
GraphicsContainer.Clear(BackgroundColor);
// Get the correct thumb center point for the current value.
float thumbCenter = ValueToPosition(Value);
// Calculate the position of the thumb
ThumbBounds.Y = (int)(thumbCenter - ThumbBounds.Height / 2f);
// Determine the margin that applied in regards to the width.
int margin = (Width - ThumbBounds.Width);
// We now subtract the same margin from the height.
// TODO: It would be nicer to have a set margin that is subtracted from the control height and included in all calculations.
Rectangle visibleBounds = ThumbBounds;
visibleBounds.Y += margin / 2;
visibleBounds.Height -= margin;
GraphicsContainer.FillRectangle(ForegroundBrush, visibleBounds);
}