// TODO: other preparations
/// <summary>
/// Prepares and renders, with rectange range.
/// </summary>
public TextRenderInfo Render(IFill fill, ICanvas canvas, string text, float fontSize,
TextOptions options, float lineSpacing, Vector2f leftBottom, Vector2f size)
{
TextRenderInfo info = Prepare(canvas, text, fontSize, options, lineSpacing,
leftBottom, size);
info.Render(fill);
return(info);
}
/// <summary>
/// Prepares and renders, with customized line starts and lengths.
/// </summary>
public TextRenderInfo Render(IFill fill, ICanvas canvas, string text, float fontSize,
TextOptions optons, Vector2f[] lineStarts, float[] lineLengths)
{
TextRenderInfo info = Prepare(canvas, text, fontSize, optons,
lineStarts, lineLengths);
info.Render(fill);
return(info);
}
/// <summary>
/// Prepares text for rendering, with rectange where data should be rendered.
/// </summary>
public TextRenderInfo Prepare(ICanvas canvas, string text, float fontSize,
TextOptions options, float lineSpacing, Vector2f leftBottom, Vector2f size)
{
// We extract information and convert them.
bool newLineOrdinary = HasFlag(options, TextOptions.NewLineOrdinary);
bool groupWords = HasFlag(options, TextOptions.NotGroupWords);
bool allowMulti = HasFlag(options, TextOptions.AllowMulticharacters);
if (!HasFlag(options, TextOptions.UseCanvasUnits))
{
// We use Y dimension, since it is primary axis for text (we want it properly aligned).
fontSize *= canvas.CanvasInfo.CanvasUnitSize.Y / canvas.CanvasInfo.CanvasPixelSize.Y;
}
lineSpacing *= fontSize;
// We go for each character.
float lineY = leftBottom.Y + size.Y - fontSize;
float lineX = leftBottom.X;
// Return data.
List <TextRenderLineInfo> lines = new List <TextRenderLineInfo>();
TextRenderLineInfo currentLine = new TextRenderLineInfo(
new Vector2f(leftBottom.X, leftBottom.X + size.X));
for (int i = 0; i < text.Length; i++)
{
// We first check for out of range.
if (lineY < leftBottom.Y)
{
break;
}
// We select next character.
int advIndex = 1;
Glyph obj = null;
// We find next glyph.
if (text[i] != '\n' || newLineOrdinary)
{
obj = SelectGlyph(text, i, out advIndex, allowMulti);
}
// We have it multiplied.
float adv = obj.Advance;
adv *= fontSize;
// We check for line fit.
if ((!newLineOrdinary && text[i] == '\n') || (lineX + adv >= leftBottom.X + size.X))
{
// We go to new line.
lines.Add(currentLine);
lineY -= lineSpacing;
lineX = leftBottom.X;
if (lineY < leftBottom.Y)
{
currentLine = null;
break;
}
else
{
i--;
currentLine = new TextRenderLineInfo(
new Vector2f(leftBottom.X, leftBottom.X + size.X));
continue;
}
}
// We advance and add it. We must carefully handle multi-char glyphs.
for (int j = 0; j < advIndex; j++)
{
// We create information.
RenderGlyphInfo info2 = new RenderGlyphInfo(
text[i + j], j == 0 ? text.Substring(i, advIndex) : string.Empty,
new Vector2f(lineX + j * (adv / advIndex), lineY), new Vector2f(adv / advIndex, fontSize),
j == 0 ? new Vector2f(adv, fontSize) : Vector2f.Zero, j == 0 ? obj : null, i + j);
currentLine.Append(info2);
}
// We advance.
lineX += adv;
}
if (currentLine != null)
{
lines.Add(currentLine);
}
TextRenderInfo info = new TextRenderInfo(canvas, this, fontSize, lines.ToArray());
// We now post-transform using flags.
if (HasFlag(options, TextOptions.Top))
{
// Already positioned.
}
else if (HasFlag(options, TextOptions.Bottom))
{
float disp = lines[lines.Count - 1].Bottom - leftBottom.Y;
info.Translate(new Vector2f(0, -disp));
}
else
{
// Center positioning.
float disp = (lines[lines.Count - 1].Bottom - leftBottom.Y) / 2.0f;
info.Translate(new Vector2f(0, -disp));
}
// We also align.
if (HasFlag(options, TextOptions.Left))
{
// Already aligned.
//info.LeftAlignLines();
}
else if (HasFlag(options, TextOptions.Right))
{
info.RightAlignLines();
}
else
{
info.CenterAlignLines();
}
return(info);
}
