/// <summary>
/// Gets an enumeration of individual shapes to be rendered in an icon for a specific hash.
/// </summary>
/// <param name="colorTheme">A color theme specifying the colors to be used in the icon.</param>
/// <param name="hash">The hash for which the shapes will be returned.</param>
protected virtual IEnumerable <Shape> GetShapes(ColorTheme colorTheme, byte[] hash)
{
var usedColorThemeIndexes = new List <int>();
foreach (var category in GetCategories())
{
var colorThemeIndex = GetOctet(hash, category.ColorIndex) % colorTheme.Count;
if (IsDuplicate(usedColorThemeIndexes, colorThemeIndex, 0, 4) || // Disallow dark gray and dark color combo
IsDuplicate(usedColorThemeIndexes, colorThemeIndex, 2, 3)) // Disallow light gray and light color combo
{
colorThemeIndex = 1;
}
usedColorThemeIndexes.Add(colorThemeIndex);
var startRotationIndex = category.RotationIndex == null ? 0 : GetOctet(hash, category.RotationIndex.Value);
var shape = category.Shapes[GetOctet(hash, category.ShapeIndex) % category.Shapes.Count];
yield return(new Shape
{
Definition = shape,
Color = colorTheme[colorThemeIndex],
Positions = category.Positions,
StartRotationIndex = startRotationIndex
});
}
}
/// <summary>
/// Generates an identicon for the specified hash.
/// </summary>
/// <param name="renderer">The <see cref="Renderer"/> to be used for rendering the icon on the target surface.</param>
/// <param name="rect">The outer bounds of the icon.</param>
/// <param name="style">The style of the icon.</param>
/// <param name="hash">The hash to be used as basis for the generated icon.</param>
public void Generate(Renderer renderer, Rectangle rect, IdenticonStyle style, byte[] hash)
{
var hue = GetHue(hash);
var colorTheme = new ColorTheme(hue, style);
RenderBackground(renderer, rect, style, colorTheme, hash);
RenderForeground(renderer, rect, style, colorTheme, hash);
}
public void Generate(Renderer renderer, Rectangle rect, IdenticonStyle style, byte[] hash)
{
if (renderer == null)
{
throw new ArgumentNullException(nameof(renderer));
}
if (style == null)
{
throw new ArgumentNullException(nameof(style));
}
if (hash == null)
{
throw new ArgumentNullException(nameof(hash));
}
var hue = GetHue(hash);
var colorTheme = new ColorTheme(hue, style);
RenderBackground(renderer, rect, style, colorTheme, hash);
RenderForeground(renderer, rect, style, colorTheme, hash);
}
/// <summary>
/// Renders the foreground of an icon.
/// </summary>
/// <param name="renderer">The <see cref="Renderer"/> to be used for rendering the icon on the target surface.</param>
/// <param name="rect">The outer bounds of the icon.</param>
/// <param name="style">The style of the icon.</param>
/// <param name="colorTheme">A color theme specifying the colors to be used in the icon.</param>
/// <param name="hash">The hash to be used as basis for the generated icon.</param>
protected virtual void RenderForeground(Renderer renderer, Rectangle rect, IdenticonStyle style, ColorTheme colorTheme, byte[] hash)
{
// Ensure rect is quadratic and a multiple of the cell count
var normalizedRect = NormalizeRectangle(rect);
var cellSize = normalizedRect.Width / CellCount;
foreach (var shape in GetShapes(colorTheme, hash))
{
var rotation = shape.StartRotationIndex;
using (renderer.BeginShape(shape.Color))
{
for (var i = 0; i < shape.Positions.Count; i++)
{
var position = shape.Positions[i];
renderer.Transform = new Transform(
normalizedRect.X + position.X * cellSize,
normalizedRect.Y + position.Y * cellSize,
cellSize, rotation++ % 4);
shape.Definition(renderer, cellSize, i);
}
}
}
}
/// <summary>
/// Renders the background of an icon.
/// </summary>
/// <param name="renderer">The <see cref="Renderer"/> to be used for rendering the icon on the target surface.</param>
/// <param name="rect">The outer bounds of the icon.</param>
/// <param name="style">The style of the icon.</param>
/// <param name="colorTheme">A color theme specifying the colors to be used in the icon.</param>
/// <param name="hash">The hash to be used as basis for the generated icon.</param>
protected virtual void RenderBackground(Renderer renderer, Rectangle rect, IdenticonStyle style, ColorTheme colorTheme, byte[] hash)
{
renderer.SetBackground(style.BackColor);
}
