public void Draw(RenderContext renderContext, float opacity, Color color)
{
if (renderContext.gl == null)
{
Vector3d viewPoint = Vector3d.TransformCoordinate(renderContext.ViewPoint, ViewTransform);
double drawHeight = (Height / renderContext.FovAngle) * renderContext.Height / 180;
foreach (Text3d t3d in Items)
{
Vector3d screenSpacePnt = renderContext.WVP.Transform(t3d.center);
if (screenSpacePnt.Z < 0)
{
continue;
}
if (Vector3d.Dot((Vector3d)viewPoint, (Vector3d)t3d.center) < .55)
{
continue;
}
Vector3d screenSpaceTop = renderContext.WVP.Transform(t3d.top);
double rotation = Math.Atan2(screenSpacePnt.X - screenSpaceTop.X, screenSpacePnt.Y - screenSpaceTop.Y);
CanvasContext2D ctx = renderContext.Device;
ctx.Save();
ctx.Translate(screenSpacePnt.X, screenSpacePnt.Y);
ctx.Rotate(-rotation); // todo update with up vector
ctx.Alpha = opacity;
ctx.FillStyle = color.ToString();
ctx.Font = "normal" + " " + (false ? "bold" : "normal") + " " + Math.Round(drawHeight * 1.2).ToString() + "px " + "Arial";
ctx.TextBaseline = TextBaseline.Top;
TextMetrics tm = ctx.MeasureText(t3d.Text);
ctx.FillText(t3d.Text, -tm.Width / 2, -drawHeight / 2);
ctx.Restore();
}
}
else
{
// gl version
if (glyphCache == null || glyphCache.Version > glyphVersion)
{
PrepareBatch();
}
if (glyphCache.Ready == false)
{
return;
}
TextShader.Use(renderContext, vertexBuffer.VertexBuffer, glyphCache.Texture.Texture2d);
renderContext.gl.drawArrays(GL.TRIANGLES, 0, vertexBuffer.Count);
}
}
public static List <string> GetWrappedText(CanvasContext2D ctx, string text, double width)
{
List <string> lines = new List <string>();
string[] words = text.Split(" ");
string currentLine = "";
for (int i = 0; i < words.Length; i++)
{
if (!string.IsNullOrEmpty(words[i]))
{
if (currentLine == "" || ctx.MeasureText(currentLine + " " + words[i]).Width < width)
{
currentLine += " " + words[i];
}
else
{
lines.Add(currentLine);
currentLine = words[i];
}
}
}
if (currentLine != "")
{
lines.Add(currentLine);
}
return(lines);
}
