public static void drawParagraph(NvgContext vg, float x, float y, float width, float height, float mx, float my)
{
TextRow[] rows = new TextRow[3];
GlyphPosition[] glyphs = new GlyphPosition[100];
string text = "This is 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.";
StringSegment start;
int nrows, i, nglyphs, j, lnum = 0;
float lineh;
float caretx, px;
Bounds bounds = new Bounds();
float a;
float gx = 0, gy = 0;
int gutter = 0;
for (i = 0; i < rows.Length; ++i)
{
rows[i] = new TextRow();
}
vg.Save();
vg.FontSize(18.0f);
vg.FontFace("sans");
vg.TextAlign(Alignment.Left | Alignment.Top);
float ascender, descender;
vg.TextMetrics(out ascender, out descender, out lineh);
// The text break API can be used to fill a large buffer of rows,
// or to iterate over the text just few lines (or just one) at a time.
// The "next" variable of the last returned item tells where to continue.
start = text;
while (true)
{
nrows = vg.TextBreakLines(start, width, rows, out start);
if (nrows <= 0)
{
break;
}
for (i = 0; i < nrows; i++)
{
TextRow row = rows[i];
var hit = mx > x && mx < (x + width) && my >= y && my < (y + lineh);
vg.BeginPath();
vg.FillColor(new Color(255, 255, 255, hit ? 64 : 16));
vg.Rect(x, y, row.Width, lineh);
vg.Fill();
vg.FillColor(new Color(255, 255, 255, 255));
vg.Text(x, y, row.Str);
if (hit)
{
caretx = (mx < x + row.Width / 2) ? x : x + row.Width;
px = x;
nglyphs = vg.TextGlyphPositions(x, y, row.Str, glyphs);
for (j = 0; j < nglyphs; j++)
{
float x0 = glyphs[j].X;
float x1 = (j + 1 < nglyphs) ? glyphs[j + 1].X : x + row.Width;
float gx2 = x0 * 0.3f + x1 * 0.7f;
if (mx >= px && mx < gx2)
{
caretx = glyphs[j].X;
}
px = gx2;
}
vg.BeginPath();
vg.FillColor(new Color(255, 192, 0, 255));
vg.Rect(caretx, y, 1, lineh);
vg.Fill();
gutter = lnum + 1;
gx = x - 10;
gy = y + lineh / 2;
}
lnum++;
y += lineh;
}
}
if (gutter > 0)
{
string txt = gutter.ToString();
vg.FontSize(13.0f);
vg.TextAlign(Alignment.Right | Alignment.Middle);
vg.TextBounds(gx, gy, txt, ref bounds);
vg.BeginPath();
vg.FillColor(new Color(255, 192, 0, 255));
vg.RoundedRect((int)bounds.b1 - 4, (int)bounds.b2 - 2,
(int)(bounds.b3 - bounds.b1) + 8,
(int)(bounds.b4 - bounds.b2) + 4,
((int)(bounds.b4 - bounds.b2) + 4) / 2 - 1);
vg.Fill();
vg.FillColor(new Color(32, 32, 32, 255));
vg.Text(gx, gy, txt);
}
y += 20.0f;
vg.FontSize(13.0f);
vg.TextAlign(Alignment.Left | Alignment.Top);
vg.TextLineHeight(1.2f);
vg.TextBoxBounds(x, y, 150, "Hover your mouse over the text to see calculated caret position.", ref bounds);
// Fade the tooltip out when close to it.
gx = (float)Math.Abs((mx - (bounds.b1 + bounds.b3) * 0.5f) / (bounds.b1 - bounds.b3));
gy = (float)Math.Abs((my - (bounds.b2 + bounds.b4) * 0.5f) / (bounds.b2 - bounds.b4));
a = maxf(gx, gy) - 0.5f;
a = clampf(a, 0, 1);
vg.GlobalAlpha(a);
vg.BeginPath();
vg.FillColor(new Color(220, 220, 220, 255));
vg.RoundedRect(bounds.b1 - 2, bounds.b2 - 2, (int)(bounds.b3 - bounds.b1) + 4, (int)(bounds.b4 - bounds.b2) + 4, 3);
px = (int)((bounds.b3 + bounds.b1) / 2);
vg.MoveTo(px, bounds.b2 - 10);
vg.LineTo(px + 7, bounds.b2 + 1);
vg.LineTo(px - 7, bounds.b2 + 1);
vg.Fill();
vg.FillColor(new Color(0, 0, 0, 220));
vg.TextBox(x, y, 150, "Hover your mouse over the text to see calculated caret position.");
vg.Restore();
}