protected void DrawHsvDial(DrawingContext drawingContext)
{
float cx = (float)(Bounds.Width) / 2.0f;
float cy = (float)(Bounds.Height) / 2.0f;
float outer_radius = (float)Math.Min(cx, cy);
ActualOuterRadius = outer_radius;
int bmp_width = (int)Bounds.Width;
int bmp_height = (int)Bounds.Height;
if (bmp_width <= 0 || bmp_height <= 0)
{
return;
}
var stopwatch = new Stopwatch();
stopwatch.Start();
//This probably wants to move somewhere else....
if (border == null)
{
border = new Ellipse();
border.Fill = new SolidColorBrush(Colors.Transparent);
border.Stroke = new SolidColorBrush(Colors.Black);
border.StrokeThickness = 3;
border.IsHitTestVisible = false;
border.Opacity = 50;
this.Children.Add(border);
border.HorizontalAlignment = HA.Center;
border.VerticalAlignment = VA.Center;
}
border.Width = Math.Min(bmp_width, bmp_height) + (border.StrokeThickness / 2);
border.Height = Math.Min(bmp_width, bmp_height) + (border.StrokeThickness / 2);
var writeableBitmap = new WriteableBitmap(new PixelSize(bmp_width, bmp_height), new Vector(96, 96), PixelFormat.Bgra8888);
using (var lockedFrameBuffer = writeableBitmap.Lock())
{
unsafe
{
IntPtr bufferPtr = new IntPtr(lockedFrameBuffer.Address.ToInt64());
for (int y = 0; y < bmp_height; y++)
{
for (int x = 0; x < bmp_width; x++)
{
int color_data = 0;
// Convert xy to normalized polar co-ordinates
double dx = x - cx;
double dy = y - cy;
double pr = Math.Sqrt(dx * dx + dy * dy);
// Only draw stuff within the circle
if (pr <= outer_radius)
{
// Compute the color for the given pixel using polar co-ordinates
double pa = Math.Atan2(dx, dy);
RGBStruct c = ColorFunction(pr / outer_radius, ((pa + Math.PI) * 180.0 / Math.PI));
// Anti-aliasing
// This works by adjusting the alpha to the alias error between the outer radius (which is integer)
// and the computed radius, pr (which is float).
double aadelta = pr - (outer_radius - 1.0);
if (aadelta >= 0.0)
{
c.a = (byte)(255 - aadelta * 255);
}
color_data = c.ToARGB32();
}
*((int *)bufferPtr) = color_data;
bufferPtr += 4;
}
}
}
}
drawingContext.DrawImage(writeableBitmap, Bounds);
stopwatch.Stop();
Debug.WriteLine($"YO! This puppy took {stopwatch.ElapsedMilliseconds} MS to complete");
}
protected void DrawHsvDial(DrawingContext drawingContext)
{
float cx = (float)this.ActualWidth / 2.0f;
float cy = (float)this.ActualHeight / 2.0f;
float outer_radius = (float)Math.Min(cx, cy);
ActualOuterRadius = outer_radius;
//double outer_circumference = 2.0 * Math.PI * outer_radius;
int bmp_width = (int)this.ActualWidth;
int bmp_height = (int)this.ActualHeight;
if (bmp_width <= 0 || bmp_height <= 0)
{
return;
}
bitmap = new WriteableBitmap(bmp_width, bmp_height, 96.0, 96.0, PixelFormats.Bgra32, null);
bitmap.Lock();
unsafe
{
int pBackBuffer = (int)bitmap.BackBuffer;
for (int y = 0; y < bmp_height; y++)
{
for (int x = 0; x < bmp_width; x++)
{
int color_data = 0;
//double inner_radius = radius * InnerRadius;
// Convert xy to normalized polar co-ordinates
double dx = x - cx;
double dy = y - cy;
double pr = Math.Sqrt(dx * dx + dy * dy);
// Only draw stuff within the circle
if (pr <= outer_radius)
{
// Compute the colour for the given pixel using polar co-ordinates
double pa = Math.Atan2(dx, dy);
RGBStruct c = ColourFunction(pr / outer_radius, ((pa + Math.PI) * 180.0 / Math.PI));
// Anti-aliasing
// This works by adjusting the alpha to the alias error between the outer radius (which is integer)
// and the computed radius, pr (which is float).
double aadelta = pr - (outer_radius - 1.0);
if (aadelta >= 0.0)
{
c.a = (byte)(255 - aadelta * 255);
}
color_data = c.ToARGB32();
}
*((int *)pBackBuffer) = color_data;
pBackBuffer += 4;
}
}
}
bitmap.AddDirtyRect(new Int32Rect(0, 0, bmp_width, bmp_height)); // I like to get dirty
bitmap.Unlock();
drawingContext.DrawImage(bitmap, new Rect(this.RenderSize));
}