/// <summary>
/// Gets the offset into the rectangle of the top left (or top right
/// if right to left) for the character at textIndex.
/// </summary>
/// <param name="textIndex"></param>
/// <returns></returns>
public PointF GetOffset(string text, List <TextRange> lines,
int textIndex,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
float width, float height, bool leftToRight)
{
int lineIndex = GetLineIndex(lines, textIndex);
if (lineIndex == -1)
{
throw new Exception("Invalid text index");
}
TextRange line = lines[lineIndex];
PointF rv = new PointF();
// Get the top left of the text area
rv.X = GetTextStartOffset(text, line, horzFormat, width, leftToRight);
rv.Y = GetTextStartOffset(lines.Count, lineIndex, vertFormat, height);
// Move to the left past some characters
if (textIndex > line.end)
{
textIndex = line.end;
}
rv.X += GetTextExtent(text, line.start, textIndex - line.start);
return(rv);
}
/// <summary>
/// Get the index of the character at position pos
/// </summary>
/// <param name="pos">the position of the character within the text draw area</param>
/// <param name="text"></param>
/// <param name="lines"></param>
/// <param name="horzFormat"></param>
/// <param name="vertFormat"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="leftToRight"></param>
/// <returns></returns>
public int GetTextIndexFromPosition(PointF pos, string text,
List <TextRange> lines,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
float width, float height,
bool leftToRight)
{
float y = GetTextStartOffset(lines.Count, 0, vertFormat, height);
float deltaY = pos.Y - y;
if (deltaY < 0)
{
return(0);
}
int lineIndex = (int)(deltaY / this.LineSpacing);
if (lineIndex >= lines.Count)
{
return(text.Length);
}
float x = GetTextStartOffset(text, lines[lineIndex], horzFormat, width, leftToRight);
float deltaX = pos.X - x;
if (!leftToRight)
{
throw new NotImplementedException("rightToLeft layout not fully supported");
}
if (deltaX < 0)
{
return(lines[lineIndex].start);
}
return(GetCharAtPixel(text, lines[lineIndex].start, lines[lineIndex].end - lines[lineIndex].start, deltaX));
}
/// <summary>
/// Draw text into a specified area of the display.
/// </summary>
/// <param name="text">The text to be drawn.</param>
/// <param name="area">
/// Rect object describing the area of the display where the text is to be rendered. The text is not clipped to this Rect, but is formatted
/// using this Rect depending upon the option specified in <paramref name="format"/>.
/// </param>
/// <param name="z">float value specifying the z co-ordinate for the drawn text.</param>
/// <param name="clip">Rect object describing the clipping area for the drawing. No drawing will occur outside this Rect.</param>
/// <param name="format">The text formatting required.</param>
/// <param name="colors">
/// ColorRect object describing the colors to be applied when drawing the text.
/// The colors specified in here are applied to each glyph, rather than the text as a whole.
/// </param>
/// <returns>The number of lines output. This does not consider clipping, so if all text was clipped, this would still return >=1.</returns>
public int DrawText(string text, Rect area, float z, Rect clip,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
ColorRect colors)
{
List <TextRange> lines = GetLines(text, area.Width, horzFormat, false);
return(DrawText(text, lines, area, z, clip, horzFormat, vertFormat, colors));
}
protected float GetTextStartOffset(int lineCount, int lineIndex,
VerticalTextFormat format,
float height)
{
switch (format)
{
case VerticalTextFormat.Top:
return(lineIndex * this.LineSpacing);
case VerticalTextFormat.Bottom:
return(height - (lineCount - lineIndex) * this.LineSpacing);
case VerticalTextFormat.Centered:
return((height - lineCount * this.LineSpacing) / 2 + lineIndex * this.LineSpacing);
default:
throw new NotImplementedException(string.Format("Unknown text format option '{0}'", format));
}
}
/// <summary>
/// Draw text into a specified area of the display.
/// </summary>
/// <param name="text">The text to be drawn.</param>
/// <param name="area">
/// Rect object describing the area of the display where the text is to be rendered. The text is not clipped to this Rect, but is formatted
/// using this Rect depending upon the option specified in <paramref name="format"/>.
/// </param>
/// <param name="z">float value specifying the z co-ordinate for the drawn text.</param>
/// <param name="clip">Rect object describing the clipping area for the drawing. No drawing will occur outside this Rect.</param>
/// <param name="format">The text formatting required.</param>
/// <param name="colors">
/// ColorRect object describing the colors to be applied when drawing the text.
/// The colors specified in here are applied to each glyph, rather than the text as a whole.
/// </param>
/// <returns>The number of lines output. This does not consider clipping, so if all text was clipped, this would still return >=1.</returns>
public int DrawText(string text, List <TextRange> lines, Rect area, float z, Rect clip, HorizontalTextFormat horzFormat, VerticalTextFormat vertFormat, ColorRect colors)
{
foreach (TextRange line in lines)
{
PointF offset = GetOffset(text, lines, line.start, horzFormat, vertFormat, area.Width, area.Height, leftToRight);
DrawTextLine(text, line.start, line.Length,
new Vector3(area.Left + offset.X, area.Top + offset.Y, z),
clip, colors);
}
return(lines.Count);
}
protected float GetTextStartOffset(int lineCount, int lineIndex,
VerticalTextFormat format,
float height)
{
switch (format) {
case VerticalTextFormat.Top:
return lineIndex * this.LineSpacing;
case VerticalTextFormat.Bottom:
return height - (lineCount - lineIndex) * this.LineSpacing;
case VerticalTextFormat.Centered:
return (height - lineCount * this.LineSpacing) / 2 + lineIndex * this.LineSpacing;
default:
throw new NotImplementedException(string.Format("Unknown text format option '{0}'", format));
}
}
/// <summary>
/// Get the index of the character at position pos
/// </summary>
/// <param name="pos">the position of the character within the text draw area</param>
/// <param name="text"></param>
/// <param name="lines"></param>
/// <param name="horzFormat"></param>
/// <param name="vertFormat"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="leftToRight"></param>
/// <returns></returns>
public int GetTextIndexFromPosition(PointF pos, string text,
List<TextRange> lines,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
float width, float height,
bool leftToRight)
{
float y = GetTextStartOffset(lines.Count, 0, vertFormat, height);
float deltaY = pos.Y - y;
if (deltaY < 0)
return 0;
int lineIndex = (int)(deltaY / this.LineSpacing);
if (lineIndex >= lines.Count)
return text.Length;
float x = GetTextStartOffset(text, lines[lineIndex], horzFormat, width, leftToRight);
float deltaX = pos.X - x;
if (!leftToRight)
throw new NotImplementedException("rightToLeft layout not fully supported");
if (deltaX < 0)
return lines[lineIndex].start;
return GetCharAtPixel(text, lines[lineIndex].start, lines[lineIndex].end - lines[lineIndex].start, deltaX);
}
/// <summary>
/// Gets the offset into the rectangle of the top left (or top right
/// if right to left) for the character at textIndex.
/// </summary>
/// <param name="textIndex"></param>
/// <returns></returns>
public PointF GetOffset(string text, List<TextRange> lines,
int textIndex,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
float width, float height, bool leftToRight)
{
int lineIndex = GetLineIndex(lines, textIndex);
if (lineIndex == -1)
throw new Exception("Invalid text index");
TextRange line = lines[lineIndex];
PointF rv = new PointF();
// Get the top left of the text area
rv.X = GetTextStartOffset(text, line, horzFormat, width, leftToRight);
rv.Y = GetTextStartOffset(lines.Count, lineIndex, vertFormat, height);
// Move to the left past some characters
if (textIndex > line.end)
textIndex = line.end;
rv.X += GetTextExtent(text, line.start, textIndex - line.start);
return rv;
}
/// <summary>
/// Draw text into a specified area of the display.
/// </summary>
/// <param name="text">The text to be drawn.</param>
/// <param name="area">
/// Rect object describing the area of the display where the text is to be rendered. The text is not clipped to this Rect, but is formatted
/// using this Rect depending upon the option specified in <paramref name="format"/>.
/// </param>
/// <param name="z">float value specifying the z co-ordinate for the drawn text.</param>
/// <param name="clip">Rect object describing the clipping area for the drawing. No drawing will occur outside this Rect.</param>
/// <param name="format">The text formatting required.</param>
/// <param name="colors">
/// ColorRect object describing the colors to be applied when drawing the text.
/// The colors specified in here are applied to each glyph, rather than the text as a whole.
/// </param>
/// <returns>The number of lines output. This does not consider clipping, so if all text was clipped, this would still return >=1.</returns>
public int DrawText(string text, List<TextRange> lines, Rect area, float z, Rect clip, HorizontalTextFormat horzFormat, VerticalTextFormat vertFormat, ColorRect colors)
{
foreach (TextRange line in lines) {
PointF offset = GetOffset(text, lines, line.start, horzFormat, vertFormat, area.Width, area.Height, leftToRight);
DrawTextLine(text, line.start, line.Length,
new Vector3(area.Left + offset.X, area.Top + offset.Y, z),
clip, colors);
}
return lines.Count;
}
/// <summary>
/// Draw text into a specified area of the display.
/// </summary>
/// <param name="text">The text to be drawn.</param>
/// <param name="area">
/// Rect object describing the area of the display where the text is to be rendered. The text is not clipped to this Rect, but is formatted
/// using this Rect depending upon the option specified in <paramref name="format"/>.
/// </param>
/// <param name="z">float value specifying the z co-ordinate for the drawn text.</param>
/// <param name="clip">Rect object describing the clipping area for the drawing. No drawing will occur outside this Rect.</param>
/// <param name="format">The text formatting required.</param>
/// <param name="colors">
/// ColorRect object describing the colors to be applied when drawing the text.
/// The colors specified in here are applied to each glyph, rather than the text as a whole.
/// </param>
/// <returns>The number of lines output. This does not consider clipping, so if all text was clipped, this would still return >=1.</returns>
public int DrawText(string text, Rect area, float z, Rect clip,
HorizontalTextFormat horzFormat,
VerticalTextFormat vertFormat,
ColorRect colors)
{
List<TextRange> lines = GetLines(text, area.Width, horzFormat, false);
return DrawText(text, lines, area, z, clip, horzFormat, vertFormat, colors);
}
