protected void UpdateTexture ()
{
text.SetSurfaceSize ((uint) (Width+MarginX),(uint) (Height+MarginY));
text.Clear ();
Cairo.Context context = text.Create ();
double lwidth = 1;
double hlwidth = lwidth*0.5;
double width = Width - lwidth;
double height = Height - lwidth;
double radius = Math.Min(marginX, marginY)*0.75;
if ((radius > height / 2) || (radius > width / 2))
radius = Math.Min(height / 2, width / 2);
context.MoveTo (hlwidth, hlwidth + radius);
context.Arc (hlwidth + radius, hlwidth + radius, radius, Math.PI, -Math.PI / 2);
context.LineTo (hlwidth + width - radius, hlwidth);
context.Arc (hlwidth + width - radius, hlwidth + radius, radius, -Math.PI / 2, 0);
context.LineTo (hlwidth + width, hlwidth + height - radius);
context.Arc (hlwidth + width - radius, hlwidth + height - radius, radius, 0, Math.PI / 2);
context.LineTo (hlwidth + radius, hlwidth + height);
context.Arc (hlwidth + radius, hlwidth + height - radius, radius, Math.PI / 2, Math.PI);
context.ClosePath ();
context.LineWidth = lwidth;
context.SetSourceRGB (1.0,1.0,1.0);
context.Stroke ();
((IDisposable) context.Target).Dispose ();
((IDisposable) context).Dispose ();
}
protected virtual void SetupBackground()
{
background.Clear();
Cairo.Context context = background.Create();
double lwidth = 1;
double hlwidth = lwidth * 0.5;
double margin = Margin;
//left curvature:
context.MoveTo(-hlwidth, -hlwidth);
context.CurveTo(margin * 0.33, -hlwidth,
margin * 0.5, Height * 0.4,
margin * 0.5, Height * 0.5);
context.CurveTo(margin * 0.5, Height * 0.6,
margin * 0.66, Height - hlwidth,
margin - hlwidth, Height - hlwidth);
//straight bottom:
context.LineTo(Width - margin - hlwidth, Height - hlwidth);
//right curvature:
context.CurveTo(Width - margin * 0.66, Height - hlwidth,
Width - margin * 0.5, Height * 0.6,
Width - margin * 0.5, Height * 0.5);
context.CurveTo(Width - margin * 0.5, Height * 0.4,
Width - margin * 0.33, -hlwidth,
Width - hlwidth, -hlwidth);
//straight top:
context.LineTo(-hlwidth, -hlwidth);
context.ClosePath();
context.LineWidth = lwidth;
context.SetSourceRGBA(1.0, 1.0, 1.0, 1.0);
context.StrokePreserve();
context.SetSourceRGBA(1.0, 1.0, 1.0, 0.10);
context.Fill();
((IDisposable)context.Target).Dispose();
((IDisposable)context).Dispose();
}
public virtual void Update()
{
outline.Clear();
Cairo.Context context = outline.Create();
context.LineWidth = line_width;
context.MoveTo(outline.Height * 0.5, 0.5);
context.Arc(outline.Width - outline.Height * 0.5, outline.Height * 0.5, (outline.Height - line_width) * 0.5, 1.5 * Math.PI, 0.5 * Math.PI);
context.Arc(outline.Height * 0.5, outline.Height * 0.5, (outline.Height - line_width) * 0.5, 0.5 * Math.PI, 1.5 * Math.PI);
context.ClosePath();
context.SetSourceRGBA(1.0, 1.0, 1.0, 0.2);
context.FillPreserve();
context.SetSourceRGB(1.0, 1.0, 1.0);
context.Stroke();
((IDisposable)context.Target).Dispose();
((IDisposable)context).Dispose();
handle.Update();
handle.RaiseTop();
arrow_left.Update();
arrow_right.Update();
}
/// <summary>
/// Redraws the circle_prototype which is used for all circles as template.
/// This means a new circle is drawn with cairo and stored in a texture.
/// </summary>
static private void UpdatePrototype (CairoTexture actor, double r, double g, double b, double a,
double arc, double a_r, double a_g, double a_b)
{
double size = (double)circle_size;
actor.Clear();
Cairo.Context context = actor.Create();
Cairo.Gradient pattern = new Cairo.RadialGradient(size/2.0,size/2.0,size/3.0,
size/2.0,size/2.0,size/2.0);
pattern.AddColorStop(0,new Cairo.Color (r,g,b,a));
pattern.AddColorStop(1.0,new Cairo.Color (r,g,b,0.1));
context.LineWidth = (double)size/5.0;
context.Arc (size/2.0, size/2.0,
size/2.0-context.LineWidth/2.0,0,2*Math.PI);
context.Save();
context.Pattern = pattern;
context.Fill();
if (arc != 0) {
context.LineWidth = (double)size/10.0;
context.Arc (size/2.0, size/2.0,
size/2.0-context.LineWidth/2.0,-Math.PI/2.0,2*Math.PI*arc/100.0-Math.PI/2.0);
Hyena.Log.Debug ("Arc prototype "+ arc);
context.Color = new Cairo.Color (a_r,a_g,a_b,0.5);
context.Stroke ();
}
((IDisposable) context.Target).Dispose ();
((IDisposable) context).Dispose ();
}
