C# Avionic Instrument Controls

protected override void OnPaint(PaintEventArgs pe)
{
    // Calling the base class OnPaint
    base.OnPaint(pe);

    // Pre Display computings

    Point ptBoule = new Point(25, - 330);
    Point ptRotation = new Point(150, 150);

    float scale = (float)this.Width / bmpCadran.Width;

    // Affichages - - - - - - - - - - - - - - - - - - - - - -

    bmpCadran.MakeTransparent(Color.Yellow);
    bmpAvion.MakeTransparent(Color.Yellow);

    // display Horizon
    RotateAndTranslate(pe, bmpBoule, RollAngle, 0, ptBoule, (int)(4*PitchAngle), ptRotation, scale);

    // diplay mask
    Pen maskPen = new Pen(this.BackColor,30*scale);
    pe.Graphics.DrawRectangle(maskPen, 0, 0, bmpCadran.Width * scale, bmpCadran.Height * scale);

    // display cadran
    pe.Graphics.DrawImage(bmpCadran, 0, 0, (float)(bmpCadran.Width * scale), (float)(bmpCadran.Height * scale));

    // display aircraft symbol
    pe.Graphics.DrawImage(bmpAvion, (float)((0.5 * bmpCadran.Width - 0.5 * bmpAvion.Width) * scale), (float)((0.5 * bmpCadran.Height - 0.5 * bmpAvion.Height) * scale), (float)(bmpAvion.Width * scale), (float)(bmpAvion.Height * scale));

}

private void Altimeter_Paint(object sender, PaintEventArgs e)
{
	try
	{
		SolidBrush NeedleBrush = new SolidBrush(Color.Yellow);
		// Draw the background Image
		this.BackgroundImage = new Bitmap(this.Width, this.Height);
		Graphics Background = Graphics.FromImage(this.BackgroundImage);
		// Draw the dial
		Background.DrawImage(this.DialImage, 0, 0);
		// Draw the scrolling numbers
		float imageIndex;

		// First the 10s numbers
		imageIndex = this.mAltitude % 100;
		imageIndex = imageIndex / 10;
		float lowDigit = imageIndex;
		imageIndex = (imageIndex * this.DigitHeight_10) + this.DigitStart_10;
		Background.DrawImage(this.TensImage, this.DigitRect_10, new Rectangle(0, (int)imageIndex, this.TensImage.Width, this.DigitRect_10.Height), GraphicsUnit.Pixel);

		// Then the 100s
		imageIndex = this.mAltitude / 100;
		imageIndex = imageIndex % 10;
		imageIndex = (float)Math.Floor(imageIndex);
		imageIndex = (imageIndex * this.DigitHeight_10) + this.DigitStart_100;
		// Slowly shift this digit when it reaches 90 feet
		if (lowDigit > 9)
		{
			float shift = (lowDigit - 9) * this.DigitHeight_10;
			imageIndex += shift;
		}
		// Draw the digit
		Background.DrawImage(this.HundredsImage, this.DigitRect_100, new Rectangle(0, (int)imageIndex, this.HundredsImage.Width, this.DigitRect_100.Height), GraphicsUnit.Pixel);

		// Then the 1000s
		if (this.mAltitude < 990)
		{
			Background.DrawImage(this.FlagImage, this.DigitRect_1000, new Rectangle(0, 0, this.FlagImage.Width, this.FlagImage.Height), GraphicsUnit.Pixel);
		}
		else
		{
			imageIndex = this.mAltitude / 1000;
			imageIndex = imageIndex % 10;
			// Check to see this digit is moving
			bool updateDigit = false;
			if ((imageIndex % 1) > 0.99)
			{
				updateDigit = true;
			}
			imageIndex = (float)Math.Floor(imageIndex);
			imageIndex = (imageIndex * this.DigitHeight_1000) + this.DigitStart_1000;
			// Slowly shift this digit when it reaches 90 feet
			if ((lowDigit > 9) && updateDigit)
			{
				float shift = (lowDigit - 9) * this.DigitHeight_1000;
				imageIndex += shift;
			}
			Background.DrawImage(this.ThousandsImage, this.DigitRect_1000, new Rectangle(0, (int)imageIndex, this.ThousandsImage.Width, this.DigitRect_1000.Height), GraphicsUnit.Pixel);
		}

		// Finally the 10,000s, if there is no 10,000s, then display the number as flagged
		if (this.mAltitude < 9990)
		{
			Background.DrawImage(this.FlagImage, this.DigitRect_10000, new Rectangle(0, 0, this.FlagImage.Width, this.FlagImage.Height), GraphicsUnit.Pixel);
		}
		else
		{
			imageIndex = this.mAltitude / 10000;
			// Check to see this digit is moving
			bool updateDigit = false;
			if ((imageIndex % 1) > 0.999)
			{
				updateDigit = true;
			}
			imageIndex = (float)Math.Floor(imageIndex);
			imageIndex = (imageIndex * this.DigitHeight_1000) + this.DigitStart_1000;
			// Slowly shift this digit when it reaches 90 feet
			if ((lowDigit > 9) && updateDigit)
			{
				float shift = (lowDigit - 9) * this.DigitHeight_1000;
				imageIndex += shift;
			}
			Background.DrawImage(this.ThousandsImage, this.DigitRect_10000, new Rectangle(0, (int)imageIndex, this.ThousandsImage.Width, this.DigitRect_10000.Height), GraphicsUnit.Pixel);
		}

		// Draw the pointer
		float altNeedleAngle = (((this.mAltitude % 100) / 100.0F) * 360.0F) - 90.0F;
		// Work out the needle endpoint
		Point altPoint = new Point();
		altPoint.X = this.dialCentre.X + (int)Math.Round(this.NeedleLength * Math.Cos(altNeedleAngle * Math.PI / 180));
		altPoint.Y = this.dialCentre.Y + (int)Math.Round(this.NeedleLength * Math.Sin(altNeedleAngle * Math.PI / 180));
		Point TipPoint1 = new Point();
		TipPoint1.X = this.dialCentre.X + (int)Math.Round((this.NeedleLength - 8) * Math.Cos((altNeedleAngle - 5) * Math.PI / 180));
		TipPoint1.Y = this.dialCentre.Y + (int)Math.Round((this.NeedleLength - 8) * Math.Sin((altNeedleAngle - 5) * Math.PI / 180));
		Point TipPoint2 = new Point();
		TipPoint2.X = this.dialCentre.X + (int)Math.Round((this.NeedleLength - 8) * Math.Cos((altNeedleAngle + 5) * Math.PI / 180));
		TipPoint2.Y = this.dialCentre.Y + (int)Math.Round((this.NeedleLength - 8) * Math.Sin((altNeedleAngle + 5) * Math.PI / 180));
		Point TipPoint3 = new Point();
		TipPoint3.X = this.dialCentre.X + (int)Math.Round(this.NeedleStart * Math.Cos(altNeedleAngle * Math.PI / 180));
		TipPoint3.Y = this.dialCentre.Y + (int)Math.Round(this.NeedleStart * Math.Sin(altNeedleAngle * Math.PI / 180));

		// Create the polygon with the points
		Point[] altNeedle = {
			altPoint,			// The end of the needle
			TipPoint1,			// The left side pint
			TipPoint3,			// The inner tip point
			TipPoint2 };		// The right side other side
		// Draw the polygon
		Background.FillPolygon(NeedleBrush, altNeedle);
		// Paste the image to the control
		e.Graphics.DrawImage(this.BackgroundImage, 0, 0);

		// Freeup the resources
		NeedleBrush.Dispose();
		this.BackgroundImage.Dispose();
		Background.Dispose();
	}
	catch (Exception ex)
	{
		if (ex.Message != "")
		{ }
	}
}