/// <summary>
/// Measures the specified text string. Parameter bounds contains the bounds of the text.<br/>
/// Measured values are returned in local coordinate space.
/// </summary>
/// <param name="bounds">Contains the bounds of the text when returned.</param>
/// <returns>The horizontal advance of the measured text (i.e. where the next character should be drawn).</returns>
public static float TextBounds(this Nvg nvg, Vector2D <float> pos, string @string, string end, out Rectangle <float> bounds)
{
bounds = default;
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
if (state.FontId == Fontstash.INVALID)
{
return(0);
}
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
float width = fons.TextBounds(pos.X * scale, pos.Y * scale, @string, end, out float[] bs);
if (bs != null)
{
fons.LineBounds(pos.Y * scale, out bs[1], out bs[3]);
bounds = new Rectangle <float>()
{
Origin = new Vector2D <float>(bs[0] * invscale, bs[1] * invscale),
Size = new Vector2D <float>((bs[2] - bs[0]) * invscale, (bs[3] - bs[1]) * invscale)
};
}
return(width * invscale);
}
/// <summary>
/// Measures the specified multi-text string.<br/>
/// Measured values are returned in local space.
/// </summary>
/// <param name="bounds">Contains the bounds box of the multi-text when returned.</param>
public static void TextBoxBounds(this Nvg nvg, Vector2D <float> pos, float breakRowWidth, string @string, string end, out Rectangle <float> bounds)
{
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
int nrows;
Align oldAlign = state.TextAlign;
Align hAlign = state.TextAlign & (Align.Left | Align.Centre | Align.Right);
Align vAlign = state.TextAlign & (Align.Top | Align.Middle | Align.Bottom | Align.Baseline);
if (state.FontId == Fontstash.INVALID)
{
bounds = default;
return;
}
nvg.TextMetrics(out _, out _, out float lineh);
state.TextAlign = Align.Left | vAlign;
float minX = pos.X, maxX = pos.X;
float minY = pos.Y, maxY = pos.Y;
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
fons.LineBounds(0, out float rMinY, out float rMaxY);
rMinY *= invscale;
rMaxY *= invscale;
while ((nrows = TextBreakLines(nvg, @string, end, breakRowWidth, out TextRow[] rows, 2)) != 0)
{
for (uint i = 0; i < nrows; i++)
{
float rMinX, rMaxX;
float dx = 0.0f;
if (hAlign.HasFlag(Align.Left))
{
dx = 0.0f;
}
else if (hAlign.HasFlag(Align.Centre))
{
dx = breakRowWidth * 0.5f - rows[i].Width * 0.5f;
}
else if (hAlign.HasFlag(Align.Right))
{
dx = breakRowWidth - rows[i].Width;
}
rMinX = pos.X + rows[i].MinX + dx;
rMaxX = pos.X + rows[i].MaxX + dx;
minX = MathF.Min(minX, rMinX);
maxX = MathF.Max(maxX, rMaxX);
minY = MathF.Min(minY, pos.Y + rMinY);
maxY = MathF.Max(maxY, pos.Y + rMaxY);
pos.Y += lineh * state.LineHeight;
}
@string = rows[nrows - 1].Next;
}
state.TextAlign = oldAlign;
bounds = new Rectangle <float>(new Vector2D <float>(minX, minY), new Vector2D <float>(maxX, maxY) - new Vector2D <float>(minX, minY));
}
