/// <summary>
/// Create a mini gauge image with the given data.
/// </summary>
/// <param name="count">The side counts that determine the needle angle.</param>
/// <param name="doubleScale">If true the needle angle will be exaggerated x 2.</param>
/// <returns>An image containing the gauge needle (doesn't include the gauge background).</returns>
private Bitmap DrawGauge(SideCount count, bool doubleScale)
{
const int radius = 25;
const int left = 5;
const int top = 5;
// calculate needle angle
float angle;
if (count.Allied != 0 || count.Axis != 0)
{
angle = ((float)count.Axis / (count.Allied + count.Axis)) * 180;
}
else
{
angle = 90;
}
if (doubleScale)
{
angle += (angle - 90); // exaggerate angle x2
}
if (angle < 10)
{
angle = 10;
}
if (angle > 170)
{
angle = 170;
}
// get points to draw
PointF needleCenter = new PointF(left + radius - 0.5F, top + radius - 1);
PointF needleStart = Misc.AngleOffset(needleCenter, angle - 90, radius * 0.4);
PointF needleEnd = Misc.AngleOffset(needleCenter, angle - 270, radius * 1.1);
// init graphics resources
Pen penNeedle = new Pen(Color.FromArgb(192, 192, 192), 2F);
Bitmap img = new Bitmap(60, 40);
Graphics g = Graphics.FromImage(img);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// draw gauge
g.DrawLine(penNeedle, needleStart, needleEnd);
g.Dispose();
return(img);
}
// play last momentum after mouse release
private void tmrMomentum_Tick(object sender, EventArgs e)
{
PointF prevCenter = this.Center;
this.Center = Misc.AngleOffset(this.Center, momuntumAngle, momentumSpeed);
if (this.Center == prevCenter) // at edge (corner), can't move any further
{
tmrMomentum.Stop();
}
momentumSpeed -= 1;
if (momentumSpeed < 1)
{
tmrMomentum.Stop();
}
}