private static void RenderColorPickerHueRingCore(
int innerRingRadius, int outerRingRadius, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var pch = pw / 2;
var pcv = ph / 2;
if (outerRingRadius == 0)
{
outerRingRadius = Math.Min(pw, ph) / 2;
}
if (innerRingRadius == 0)
{
innerRingRadius = outerRingRadius * 2 / 3;
}
// Outer ring radius square
var orr2 = outerRingRadius * outerRingRadius;
// Inner ring radius square
var irr2 = innerRingRadius * innerRingRadius;
//var orr22 = (outerRingRadius - 5) * (outerRingRadius - 5);
//var irr22 = (innerRingRadius + 5) * (innerRingRadius + 5);
const double piInv = 1.0 / Math.PI;
for (int y = 0; y < ph; y++)
{
for (int x = 0; x < pw; x++)
{
// Radius square
var r2 = (x - pch) * (x - pch) + (y - pcv) * (y - pcv);
if (r2 >= irr2 &&
r2 <= orr2)
{
var angleRadians = Math.Atan2(y - pcv, x - pch);
var angleDegrees = (angleRadians * 180 * piInv + 90 + 360) % 360;
//var alpha = (r2 - irr22 < 5) || (orr22 - r2 < 5) ? 0.5 : 1;
//var c = ColorExtensions.FromHsl(angleDegrees, 1.0 * alpha, 0.5 * alpha, alpha);
var c = ColorExtensions.FromHsl(angleDegrees, 1.0, 0.5);
pixels[pw * y + x] = c.AsInt();
}
//else
//{
// pixels[pw * y + x] = int.MaxValue;
//}
}
}
}
private static void RenderColorPickerRGBBlueBarCore(
double red, double green, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var xmax = pw - 1;
for (int x = 0; x < pw; x++)
{
double blue = (double)x / xmax;
var c = ColorExtensions.FromRgb(red, green, blue);
for (int y = 0; y < ph; y++)
{
pixels[pw * y + x] = c.AsInt();
}
}
}
private static void RenderColorPickerHSLLightnessBarCore(
double hue, double saturation, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var xmax = pw - 1;
for (int x = 0; x < pw; x++)
{
double lightness = (double)x / xmax;
var c = ColorExtensions.FromHsl(hue, saturation, lightness);
for (int y = 0; y < ph; y++)
{
pixels[pw * y + x] = c.AsInt();
}
}
}
private static void RenderColorPickerHSVHueBarCore(
double saturation, double value, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var xmax = pw - 1;
for (int x = 0; x < pw; x++)
{
double hue = 360.0 * x / xmax;
var c = ColorExtensions.FromHsv(hue, saturation, value);
for (int y = 0; y < ph; y++)
{
pixels[pw * y + x] = c.AsInt();
}
}
}
private static void RenderColorPickerSaturationLightnessRectCore(
double hue, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var xmax = pw - 1;
var ymax = ph - 1;
for (int y = 0; y < ph; y++)
{
double lightness = 1.0 * (ph - 1 - y) / ymax;
for (int x = 0; x < pw; x++)
{
var saturation = (double)x / xmax;
var c = ColorExtensions.FromHsl(hue, saturation, lightness);
pixels[pw * y + x] = c.AsInt();
}
}
}
private static void RenderColorPickerSaturationValueTriangleCore(
double hue, int ph, int hw, double invPh, int pw, IBufferExtensions.PixelBufferInfo pixels)
{
for (int y = 0; y < ph; y++)
{
double value = 1 - 1.0 * (ph - 1 - y) / ph;
var xmin = (int)(hw * (1 - invPh * y));
var xmax = pw - xmin;
for (int x = xmin; x < xmax; x++)
{
//var saturation = (double)x / pw;
var saturation = 1 - (double)(x + xmax - pw) / pw;
var c = ColorExtensions.FromHsv(hue, saturation, value);
pixels[pw * y + x] = c.AsInt();
}
}
}
private static void RenderColorPickerSaturationLightnessTriangleCore(
double hue, int pw, int ph, IBufferExtensions.PixelBufferInfo pixels)
{
var hw = pw / 2;
var invPh = 1.0 / ph;
for (int y = 0; y < ph; y++)
{
double lightness = 1 - 1.0 * (ph - 1 - y) / ph;
var xmin = (int)(hw * (1 - invPh * y));
var xmax = pw - xmin;
for (int x = xmin; x < xmax; x++)
{
//var saturation = (double)x / xmax;
var saturation = 1 - (double)(x + xmax - pw) / pw;
var c = ColorExtensions.FromHsl(hue, saturation, lightness);
pixels[pw * y + x] = c.AsInt();
}
}
}