在Wpf中使用Color.GetSaturation，Color.GetBrightness

我正在尝试使用此处发现的问题的答案我使用颜色类有问题。 例如， Color.Red.Range(Color.Green, numberOfIntermediateColors); 出现错误，说“’System.Windows.Media.Color’不包含’Red’的定义”与GetBrightness ， GetSaturation和GetHue相同，有一个错误说”System.Windows.Media.Color’不包含’GetSaturation’的定义，没有扩展方法’GetSaturation’接受类型’System.Windows.Media.Color’的第一个参数可以找到（你是否缺少using指令或汇编引用？）“

那么有人可以请建议如何在Wpf中使用建议的答案吗？

Answer 1

不知道问题是什么，但我从其他2个答案中复制了代码，如果添加System.Drawing命名空间并修复歧义，它似乎工作正常

 int numberOfIntermediateColors = 8; IEnumerable colorPalette = System.Drawing.Color.Red.Range(System.Drawing.Color.Green, numberOfIntermediateColors); // returns 8 colors in that range. 

范围扩展方法

 public static class ColorExtensions { public static IEnumerable Range(this System.Drawing.Color firstColor, System.Drawing.Color lastColor, int count) { float stepHueClockwise = GetStepping(firstColor.GetHue(), lastColor.GetHue(), count, Direction.Clockwise); float stepHueCounterClockwise = GetStepping(firstColor.GetHue(), lastColor.GetHue(), count, Direction.CounterClockwise); if (Math.Abs(stepHueClockwise) >= Math.Abs(stepHueCounterClockwise)) return Range(firstColor, lastColor, count, Direction.Clockwise); else return Range(firstColor, lastColor, count, Direction.CounterClockwise); } public static IEnumerable Range(this System.Drawing.Color firstColor, System.Drawing.Color lastColor, int count, Direction hueDirection) { var color = firstColor; if (count <= 0) yield break; if (count == 1) yield return firstColor; float startingHue = color.GetHue(); float stepHue = GetStepping(firstColor.GetHue(), lastColor.GetHue(), count - 1, hueDirection); var stepSaturation = (lastColor.GetSaturation() - firstColor.GetSaturation()) / (count - 1); var stepBrightness = (lastColor.GetBrightness() - firstColor.GetBrightness()) / (count - 1); var stepAlpha = (lastColor.A - firstColor.A) / (count - 1.0); for (int i = 1; i < count; i++) { yield return color; var hueValue = startingHue + stepHue * i; if (hueValue > 360) hueValue -= 360; if (hueValue < 0) hueValue = 360 + hueValue; color = FromAhsb( Clamp((int)(color.A + stepAlpha), 0, 255), hueValue, Clamp(color.GetSaturation() + stepSaturation, 0, 1), Clamp(color.GetBrightness() + stepBrightness, 0, 1)); } yield return lastColor; } public enum Direction { Clockwise = 0, CounterClockwise = 1 } private static float GetStepping(float start, float end, int count, Direction direction) { var hueDiff = end - start; switch (direction) { case Direction.CounterClockwise: if (hueDiff >= 0) hueDiff = (360 - hueDiff) * -1; break; default: if (hueDiff <= 0) hueDiff = 360 + hueDiff; break; } return hueDiff / count; } private static int Clamp(int value, int min, int max) { if (value < min) return min; if (value > max) return max; return value; } private static float Clamp(float value, float min, float max) { if (value < min) return min; if (value > max) return max; return value; } public static System.Drawing.Color FromAhsb(int alpha, float hue, float saturation, float brightness) { if (0 > alpha || 255 < alpha) { throw new ArgumentOutOfRangeException( "alpha", alpha, "Value must be within a range of 0 - 255."); } if (0f > hue || 360f < hue) { throw new ArgumentOutOfRangeException( "hue", hue, "Value must be within a range of 0 - 360."); } if (0f > saturation || 1f < saturation) { throw new ArgumentOutOfRangeException( "saturation", saturation, "Value must be within a range of 0 - 1."); } if (0f > brightness || 1f < brightness) { throw new ArgumentOutOfRangeException( "brightness", brightness, "Value must be within a range of 0 - 1."); } if (0 == saturation) { return System.Drawing.Color.FromArgb( alpha, Convert.ToInt32(brightness * 255), Convert.ToInt32(brightness * 255), Convert.ToInt32(brightness * 255)); } float fMax, fMid, fMin; int iSextant, iMax, iMid, iMin; if (0.5 < brightness) { fMax = brightness - (brightness * saturation) + saturation; fMin = brightness + (brightness * saturation) - saturation; } else { fMax = brightness + (brightness * saturation); fMin = brightness - (brightness * saturation); } iSextant = (int)Math.Floor(hue / 60f); if (300f <= hue) { hue -= 360f; } hue /= 60f; hue -= 2f * (float)Math.Floor(((iSextant + 1f) % 6f) / 2f); if (0 == iSextant % 2) { fMid = (hue * (fMax - fMin)) + fMin; } else { fMid = fMin - (hue * (fMax - fMin)); } iMax = Convert.ToInt32(fMax * 255); iMid = Convert.ToInt32(fMid * 255); iMin = Convert.ToInt32(fMin * 255); switch (iSextant) { case 1: return System.Drawing.Color.FromArgb(alpha, iMid, iMax, iMin); case 2: return System.Drawing.Color.FromArgb(alpha, iMin, iMax, iMid); case 3: return System.Drawing.Color.FromArgb(alpha, iMin, iMid, iMax); case 4: return System.Drawing.Color.FromArgb(alpha, iMid, iMin, iMax); case 5: return System.Drawing.Color.FromArgb(alpha, iMax, iMin, iMid); default: return System.Drawing.Color.FromArgb(alpha, iMax, iMid, iMin); } } } 

Answer 2

使用以下扩展方法：

 public static float GetHue(this System.Windows.Media.Color c) => System.Drawing.Color.FromArgb(cA, cR, cG, cB).GetHue(); public static float GetBrightness(this System.Windows.Media.Color c) => System.Drawing.Color.FromArgb(cA, cR, cG, cB).GetBrightness(); public static float GetSaturation(this System.Windows.Media.Color c) => System.Drawing.Color.FromArgb(cA, cR, cG, cB).GetSaturation(); 

Answer 3

WPF不关心System.Drawing 。 从项目中删除该引用。

您正在寻找的是LinearGradientBrush ：

结果：

请不要使用程序代码来定义您的UI。 这就是XAML的用途。