我正在开发 wpf 应用程序。我在 C# 中有 Color 对象的实例。假设我有一个红色颜色对象的实例，即Color c = Color.FromArgb(255,255,0,0)现在假设我有一个范围从 1 到 10 的值。所以基于这个值我想改变“c”对象的颜色。我想要 1 为浅红色，10 为深红色。随着值从 1 增加，浅红色变为深色。如何在 C# 中为 wpf 应用程序执行此操作？您能否提供我可以解决上述问题的任何代码或链接？
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5 回答
11
您可以尝试简单地将红色、绿色和蓝色分量乘以某个系数。
public static Color ChangeLightness(this Color color, float coef)
{
return Color.FromArgb((int)(color.R * coef), (int)(color.G * coef),
(int)(color.B * coef));
}
或者，如果您想使用 1 到 10 之间的整数值而不是系数：
private const int MinLightness = 1;
private const int MaxLightness = 10;
private const float MinLightnessCoef = 1f;
private const float MaxLightnessCoef = 0.4f;
public static Color ChangeLightness(this Color color, int lightness)
{
if (lightness < MinLightness)
lightness = MinLightness;
else if (lightness > MaxLightness)
lightness = MaxLightness;
float coef = MinLightnessCoef +
(
(lightness - MinLightness) *
((MaxLightnessCoef - MinLightnessCoef) / (MaxLightness - MinLightness))
);
return Color.FromArgb(color.A, (int)(color.R * coef), (int)(color.G * coef),
(int)(color.B * coef));
}
于 2012-10-15T11:32:01.030 回答
2
如果您有一定数量的值，那么 Style DataTrigger 呢？
https://www.google.co.uk/search?q=c%23+wpf+style+datatrigger
<Button>
<Button.Style>
<Style TargetType="{x:Type Button}">
<Style.Triggers>
<DataTrigger Binding="{Binding NameOfYourProperty}" Value="0">
<Setter Property="Background"
Value="#FF000000" />
</DataTrigger>
<DataTrigger Binding="{Binding NameOfYourProperty}" Value="1">
<Setter Property="Background"
Value="#FF110000" />
</DataTrigger>
<DataTrigger Binding="{Binding NameOfYourProperty}" Value="2">
<Setter Property="Background"
Value="#FF220000" />
</DataTrigger>
( etc ... )
</Style.Triggers>
</Style>
</Button.Style>
</Button>
然后，如果您需要重用样式，则可以放入<Resources>窗口/用户控件的部分。
于 2012-10-15T11:27:38.057 回答
1
A cleaner solution would be to juxtapose 2 rectangles: one is the color you want, the other is black.
Then play with Opacity on the black rectangle to darken/lighten the underlying color.
It would look like:
<Grid>
<Rectangle Fill="{Binding myColor}" />
<Rectangle Fill="Black" Opacity="{Binding colorModifierPercentage}" />
</Grid>
Of course, colorModifierPercentage must be a number between 0 and 1, and rectangle can be any Shape.
于 2012-10-15T13:11:01.967 回答
1
假设您正在使用一个滑块，其最小值为1，最大值为10。您可以将值乘以25.5 (255 / max value)。然后，从最大值 (255) 中减去该答案并将其用作红色值。
double newRedValue = 255 - (slider.Value * (255 / slider.Maximum));
int redValue = Convert.ToInt32(newRedValue);
Color c = Color.FromArgb(redValue ,255,0,0)
您可以255 / slider.Maximum用一个常数值替换，因为它可能会保持不变。上面的公式会产生相反的效果，因此滑块值越低，红色的阴影越亮。当然，值 10 将导致red为0，因此如果您不希望红色分量那么低，您可以添加一个最小值。
于 2012-10-15T11:31:38.693 回答
1
CodeProject上有一篇关于它的文章：
/// <summary>
/// Converts a WPF RGB color to an HSL color
/// </summary>
/// <param name="rgbColor">The RGB color to convert.</param>
/// <returns>An HSL color object equivalent to the RGB color object passed in.</returns>
static HlsColor RgbToHls(Color rgbColor)
{
// Initialize result
var hlsColor = new HlsColor();
// Convert RGB values to percentages
double r = (double)rgbColor.R / 255;
var g = (double)rgbColor.G / 255;
var b = (double)rgbColor.B / 255;
var a = (double)rgbColor.A / 255;
// Find min and max RGB values
var min = Math.Min(r, Math.Min(g, b));
var max = Math.Max(r, Math.Max(g, b));
var delta = max - min;
/* If max and min are equal, that means we are dealing with
* a shade of gray. So we set H and S to zero, and L to either
* max or min (it doesn't matter which), and then we exit. */
//Special case: Gray
if (max == min)
{
hlsColor.H = 0;
hlsColor.S = 0;
hlsColor.L = max;
return hlsColor;
}
/* If we get to this point, we know we don't have a shade of gray. */
// Set L
hlsColor.L = (min + max) / 2;
// Set S
if(hlsColor.L < 0.5)
{
hlsColor.S = delta / (max + min);
}
else
{
hlsColor.S = delta / (2.0 - max - min);
}
// Set H
if (r == max) hlsColor.H = (g - b) / delta;
if (g == max) hlsColor.H = 2.0 + (b - r) / delta;
if (b == max) hlsColor.H = 4.0 + (r - g) / delta;
hlsColor.H *= 60;
if (hlsColor.H < 0) hlsColor.H += 360;
// Set A
hlsColor.A = a;
// Set return value
return hlsColor;
}
/// <summary>
/// Converts a WPF HSL color to an RGB color
/// </summary>
/// <param name="hlsColor">The HSL color to convert.</param>
/// <returns>An RGB color object equivalent to the HSL color object passed in.</returns>
static Color HlsToRgb(HlsColor hlsColor)
{
// Initialize result
var rgbColor = new Color();
/* If S = 0, that means we are dealing with a shade
* of gray. So, we set R, G, and B to L and exit. */
// Special case: Gray
if (hlsColor.S == 0)
{
rgbColor.R = (byte)(hlsColor.L * 255);
rgbColor.G = (byte)(hlsColor.L * 255);
rgbColor.B = (byte)(hlsColor.L * 255);
rgbColor.A = (byte)(hlsColor.A * 255);
return rgbColor;
}
double t1;
if (hlsColor.L < 0.5)
{
t1 = hlsColor.L*(1.0 + hlsColor.S);
}
else
{
t1 = hlsColor.L + hlsColor.S - (hlsColor.L * hlsColor.S);
}
var t2 = 2.0*hlsColor.L - t1;
// Convert H from degrees to a percentage
var h = hlsColor.H / 360;
// Set colors as percentage values
var tR = h + (1.0/3.0);
var r = SetColor(t1, t2, tR);
var tG = h;
var g = SetColor(t1, t2, tG);
var tB = h - (1.0 / 3.0);
var b = SetColor(t1, t2, tB);
// Assign colors to Color object
rgbColor.R = (byte)(r * 255);
rgbColor.G = (byte)(g * 255);
rgbColor.B = (byte)(b * 255);
rgbColor.A = (byte)(hlsColor.A * 255);
// Set return value
return rgbColor;
}
/// <summary>
/// Used by the HSL-to-RGB converter.
/// </summary>
/// <param name="t1">A temporary variable.</param>
/// <param name="t2">A temporary variable.</param>
/// <param name="t3">A temporary variable.</param>
/// <returns>An RGB color value, in decimal format.</returns>
private static double SetColor(double t1, double t2, double t3)
{
if (t3 < 0) t3 += 1.0;
if (t3 > 1) t3 -= 1.0;
double color;
if (6.0 * t3 < 1)
{
color = t2 + (t1 - t2) * 6.0 * t3;
}
else if(2.0 * t3 < 1)
{
color = t1;
}
else if(3.0*t3 < 2)
{
color = t2 + (t1 - t2) * ((2.0/3.0) - t3) * 6.0;
}
else
{
color = t2;
}
// Set return value
return color;
}
于 2018-12-30T21:28:12.927 回答