SampleApp.MainForm.DrawMotionHistory C# (CSharp) Method

        private void DrawMotionHistory(Bitmap image)
        {
            Color greenColor = Color.FromArgb(128, 0, 255, 0);
            Color yellowColor = Color.FromArgb(128, 255, 255, 0);
            Color redColor = Color.FromArgb(128, 255, 0, 0);

            BitmapData bitmapData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height),
                ImageLockMode.ReadWrite, image.PixelFormat);

            int t1 = (int)(motionAlarmLevel * 500);
            int t2 = (int)(0.075 * 500);

            for (int i = 1, n = motionHistory.Count; i <= n; i++)
            {
                int motionBarLength = (int)(motionHistory[n - i] * 500);

                if (motionBarLength == 0)
                    continue;

                if (motionBarLength > 50)
                    motionBarLength = 50;

                Drawing.Line(bitmapData,
                    new IntPoint(image.Width - i, image.Height - 1),
                    new IntPoint(image.Width - i, image.Height - 1 - motionBarLength),
                    greenColor);

                if (motionBarLength > t1)
                {
                    Drawing.Line(bitmapData,
                        new IntPoint(image.Width - i, image.Height - 1 - t1),
                        new IntPoint(image.Width - i, image.Height - 1 - motionBarLength),
                        yellowColor);
                }

                if (motionBarLength > t2)
                {
                    Drawing.Line(bitmapData,
                        new IntPoint(image.Width - i, image.Height - 1 - t2),
                        new IntPoint(image.Width - i, image.Height - 1 - motionBarLength),
                        redColor);
                }
            }

            image.UnlockBits(bitmapData);
        }