Lerp() public static method

public static Lerp ( PointD from, PointD to, float frac ) : PointD
from PointD
to PointD
frac float
return PointD
Utility Class Documentation
Exemplo n.º 1
0
        public void SetFromLeveledHistogram(HistogramRgb inputHistogram, LevelOp upo)
        {
            if (inputHistogram == null || upo == null)
            {
                return;
            }

            Clear();

            float[] before = new float[3];
            float[] slopes = new float[3];

            for (int c = 0; c < 3; c++)
            {
                long[] channelHistogramOutput = histogram[c];
                long[] channelHistogramInput  = inputHistogram.histogram[c];

                for (int v = 0; v <= 255; v++)
                {
                    ColorBgra after = ColorBgra.FromBgr((byte)v, (byte)v, (byte)v);

                    upo.UnApply(after, before, slopes);

                    if (after[c] > upo.ColorOutHigh[c] ||
                        after[c] < upo.ColorOutLow[c] ||
                        (int)Math.Floor(before[c]) < 0 ||
                        (int)Math.Ceiling(before[c]) > 255 ||
                        float.IsNaN(before[c]))
                    {
                        channelHistogramOutput[v] = 0;
                    }
                    else if (before[c] <= upo.ColorInLow[c])
                    {
                        channelHistogramOutput[v] = 0;

                        for (int i = 0; i <= upo.ColorInLow[c]; i++)
                        {
                            channelHistogramOutput[v] += channelHistogramInput[i];
                        }
                    }
                    else if (before[c] >= upo.ColorInHigh[c])
                    {
                        channelHistogramOutput[v] = 0;

                        for (int i = upo.ColorInHigh[c]; i < 256; i++)
                        {
                            channelHistogramOutput[v] += channelHistogramInput[i];
                        }
                    }
                    else
                    {
                        channelHistogramOutput[v] = (int)(slopes[c] * Utility.Lerp(
                                                              channelHistogramInput[(int)Math.Floor(before[c])],
                                                              channelHistogramInput[(int)Math.Ceiling(before[c])],
                                                              before[c] - Math.Floor(before[c])));
                    }
                }
            }

            OnHistogramUpdated();
        }