private void DrawParagraph(float x, float y, float width, float mx, float my)
{
string text = "This is a longer chunk of text.\n \n"
+ " Would have used lorem ipsum but she was busy jumping over the lazy dog with the fox and all the men who came to the aid of the party.";
string hoverText = "Hover your mouse over the text to see the calculated caret position.";
uint gutter = 0;
uint lnum = 0;
float gx = 0.0f, gy = 0.0f;
Rectangle <float> bounds;
float px;
_nvg.Save();
_nvg.FontSize(15.0f);
_nvg.FontFace("sans");
_nvg.TextAlign(Align.Left | Align.Top);
_nvg.TextMetrics(out _, out _, out float lineh);
string start = text;
string end = null;
int nrows;
while ((nrows = _nvg.TextBreakLines(start, end, width, out TextRow[] rows, 3)) != 0)
{
for (uint i = 0; i < nrows; i++)
{
TextRow row = rows[i];
bool hit = mx > x && mx < (x + width) && my >= y && my < (y + lineh);
_nvg.BeginPath();
_nvg.FillColour(_nvg.Rgba(255, 255, 255, hit ? (byte)64 : (byte)16));
_nvg.Rect(x + row.MinX, y, row.MaxX - row.MinX, lineh);
_nvg.Fill();
_nvg.FillColour(Colour.White);
_ = _nvg.Text(x, y, row.Start, row.End.Length != 0 ? row.End : null);
if (hit)
{
float caretX = (mx < x + row.Width / 2.0f) ? x : x + row.Width;
px = x;
int glyphCount = _nvg.TextGlyphPositions(x, y, row.Start, row.End, out GlyphPosition[] glyps, 100);
for (uint j = 0; j < glyphCount; j++)
{
float x0 = glyps[j].X;
float x1 = (j + 1 < glyphCount) ? glyps[j + 1].X : x + row.Width;
gx = x0 * 0.3f + x1 * 0.7f;
if (mx >= px && mx < gx)
{
caretX = glyps[j].X;
}
px = gx;
}
_nvg.BeginPath();
_nvg.FillColour(_nvg.Rgba(255, 192, 0, 255));
_nvg.Rect(caretX, y, 1.0f, lineh);
_nvg.Fill();
gutter = lnum + 1;
gx = x - 10.0f;
gy = y + lineh / 2.0f;
}
lnum++;
y += lineh;
}
start = rows[^ 1].Next;