/// <summary>
/// 根据渐变选择器在渐变画布中的位置改变颜色
/// </summary>
/// <param name="p">渐变选择器的中心相对于渐变画布的坐标</param>
protected void UpdateColorFromPoint(Point p)
{
if (p.X < 0)
{
p.X = 0;
}
if (p.X > shadeCanvas.ActualWidth)
{
p.X = shadeCanvas.ActualWidth;
}
if (p.Y < 0)
{
p.Y = 0;
}
if (p.Y > shadeCanvas.ActualHeight)
{
p.Y = shadeCanvas.ActualHeight;
}
//计算新的颜色
HsvColor hsvColor = lastPreciseColor.HasValue ? lastPreciseColor.Value : HsvColor.FromArgb(spectrumSlider.SelectedColor);
if (!lastPreciseColor.HasValue)
{
hsvColor.A = (double)Color.A / 255;
}
hsvColor.S = p.X / shadeCanvas.ActualWidth;
hsvColor.V = 1 - p.Y / shadeCanvas.ActualHeight;
//更新颜色
UpdateColor(hsvColor.ToArgb(), hsvColor);
}
/// <summary>
/// 频谱选择器的选择改变时触发
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.RoutedPropertyChangedEventArgs<System.Double>"/> instance containing the event data.</param>
void spectrumSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs <double> e)
{
//频谱选择已改变，需更新颜色
HsvColor hsvColor = lastPreciseColor.HasValue ? lastPreciseColor.Value : HsvColor.FromArgb(Color);
hsvColor.H = spectrumSlider.Value;
UpdateColor(hsvColor.ToArgb(), hsvColor);
}