ここで見つかった質問の回答を使用しようとしています
。カラークラスの使用に問題があります。たとえば、Color.Red.Range(Color.Green, numberOfIntermediateColors);「'System.Windows.Media.Color' には 'Red' の定義が含まれていません」というエラーが表示さGetBrightnessれGetSaturationますGetHue。 'GetSaturation' の定義と、'System.Windows.Media.Color' 型の最初の引数を受け入れる拡張メソッド 'GetSaturation' が見つかりませんでした (using ディレクティブまたはアセンブリ参照がありませんか?)"
では、提案された回答を Wpf で使用する方法を教えてください。
次の拡張メソッドを使用します。
public static float GetHue(this System.Windows.Media.Color c) =>
System.Drawing.Color.FromArgb(c.A, c.R, c.G, c.B).GetHue();
public static float GetBrightness(this System.Windows.Media.Color c) =>
System.Drawing.Color.FromArgb(c.A, c.R, c.G, c.B).GetBrightness();
public static float GetSaturation(this System.Windows.Media.Color c) =>
System.Drawing.Color.FromArgb(c.A, c.R, c.G, c.B).GetSaturation();
問題が何であるかはわかりませんが、他の2つの回答からコードをコピーしました。System.Drawing名前空間を追加してあいまいさを修正すると、正常に機能するようです
int numberOfIntermediateColors = 8;
IEnumerable<System.Drawing.Color> colorPalette = System.Drawing.Color.Red.Range(System.Drawing.Color.Green, numberOfIntermediateColors);
// returns 8 colors in that range.
範囲拡張法
public static class ColorExtensions
{
public static IEnumerable<System.Drawing.Color> 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<System.Drawing.Color> 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);
}
}
}
WPF は気にしませんSystem.Drawing。プロジェクトからその参照を削除します。
あなたが探しているのはLinearGradientBrush：
<Border>
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="Green" Offset="0"/>
<GradientStop Color="Red" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
結果：
また、手続き型コードを使用して UI を定義しないでください。それが XAML の目的です。