private int AdjustCaret(FIGcharacter character, DrawingBoard drawingBoard, int columnOffset, int rowOffset, IDrawingElementBlender blender)
{
// this is the poor man's fix (again)
// character does not have a visual, so we ignore it
if (character.Width == 0)
{
return(columnOffset);
}
var previousHasNonBlanks = false;
for (; ; columnOffset--)
{
if (!CanDraw(character, drawingBoard, columnOffset - 1, rowOffset, blender, out var hasNonBlanks) || previousHasNonBlanks)
{
return(columnOffset);
}
previousHasNonBlanks = hasNonBlanks;
}
}
/// <summary>
/// Determines whether this instance can draw the specified character.
/// </summary>
/// <param name="character">The character.</param>
/// <param name="drawingBoard">The drawing board.</param>
/// <param name="columnOffset">The column offset.</param>
/// <param name="rowOffset">The row offset.</param>
/// <param name="blender">The blender.</param>
/// <param name="hasNonBlanks">if set to <c>true</c> [has non spaces].</param>
/// <returns>
/// <c>true</c> if this instance can draw the specified character; otherwise, <c>false</c>.
/// </returns>
private bool CanDraw(FIGcharacter character, DrawingBoard drawingBoard, int columnOffset, int rowOffset, IDrawingElementBlender blender, out bool hasNonBlanks)
{
hasNonBlanks = false;
foreach (var element in GetCharacterDrawingElements(character))
{
var column = element.Column + columnOffset;
var row = element.Row + rowOffset;
if (column < 0 || row < 0)
{
return(false);
}
// this relies on the fact that element.DrawingElement is never null
var under = drawingBoard[column, row];
if (blender.TryBlend(under, element.DrawingElement) is null)
{
return(false);
}
if (!(under is null) && !under.IsBlank && !element.DrawingElement.IsBlank)
{
hasNonBlanks = true;
}
}
return(true);
}
/// <summary>
/// Initializes a new instance of the <see cref="InverseDrawingElementBlender"/> class.
/// </summary>
/// <param name="innerDrawingElementBlender">The inner drawing element blender.</param>
public InverseDrawingElementBlender(IDrawingElementBlender innerDrawingElementBlender)
{
_innerDrawingElementBlender = innerDrawingElementBlender;
}
/// <summary>
/// Draws the specified <see cref="FIGcharacter" /> to <see cref="DrawingBoard" />.
/// </summary>
/// <param name="character">The character.</param>
/// <param name="drawingBoard">The drawing board.</param>
/// <param name="columnOffset">The column offset.</param>
/// <param name="rowOffset">The row offset.</param>
/// <param name="blender">The blender.</param>
private void Draw(FIGcharacter character, DrawingBoard drawingBoard, int columnOffset, int rowOffset, IDrawingElementBlender blender)
{
foreach (var element in GetCharacterDrawingElements(character))
{
var column = element.Column + columnOffset;
var row = element.Row + rowOffset;
drawingBoard[column, row] = blender.TryBlend(drawingBoard[column, row], element.DrawingElement) ?? element.DrawingElement;
}
}
private static void CheckRenderAsSmall(string literal, string expectedRendering, IDrawingElementBlender blender)
{
var d = new FIGdriver {
Font = LoadSmallFIGfont(), Blender = blender
};
d.Write(literal);
var r = d.ToString();
Assert.IsTrue(Matches(expectedRendering, r));
}
/// <summary>
/// Applies one or another blender (the first that works)
/// </summary>
/// <param name="a">a.</param>
/// <param name="b">The b.</param>
/// <returns></returns>
public static IDrawingElementBlender Or(this IDrawingElementBlender a, IDrawingElementBlender b)
{
// TODO: optimize (if a or b is already a MultiDrawingElementBlender)
return(new MultiDrawingElementBlender(a, b));
}
/// <summary>
/// Inverses the specified blender. Allows to blend if inner blender refuses to.
/// </summary>
/// <param name="blender">The blender.</param>
/// <returns></returns>
public static IDrawingElementBlender Inverse(this IDrawingElementBlender blender)
{
return(new InverseDrawingElementBlender(blender));
}
/// <summary>
/// Transforms a blender to a blender without priority (under=over).
/// </summary>
/// <param name="blender">The blender.</param>
/// <returns></returns>
public static IDrawingElementBlender WithoutPriority(this IDrawingElementBlender blender)
{
return(new FlatDrawingElementBlender(blender));
}
/// <summary>
/// Initializes a new instance of the <see cref="FlatDrawingElementBlender"/> class.
/// </summary>
/// <param name="innerDrawingElementBlender">The inner drawing element blender.</param>
public FlatDrawingElementBlender(IDrawingElementBlender innerDrawingElementBlender)
{
_innerDrawingElementBlender = innerDrawingElementBlender;
}