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//
// ExtensionsMethods.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2015 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.Linq.Expressions;
namespace Crow
{
public static class ExtensionsMethods
{
#region Cairo extensions
public static void Rectangle(this Cairo.Context ctx, Rectangle r, double stroke = 0.0)
{
if (stroke > 0.0) {
ctx.LineWidth = stroke;
double shw = stroke / 2.0;
ctx.Rectangle (r.X + shw, r.Y + shw, r.Width - stroke, r.Height - stroke);
ctx.Stroke ();
}else
ctx.Rectangle (r.X, r.Y, r.Width, r.Height);
}
public static double GetLength(this Cairo.PointD p){
return Math.Sqrt (Math.Pow (p.X, 2) + Math.Pow (p.Y, 2));
}
public static Cairo.PointD GetPerp(this Cairo.PointD p){
return new Cairo.PointD(-p.Y, p.X);
}
public static Cairo.PointD GetNormalized(this Cairo.PointD p){
double length = p.GetLength();
p.X /= length;
p.Y /= length;
return p;
}
public static Cairo.PointD Substract(this Cairo.PointD p1, Cairo.PointD p2){
return new Cairo.PointD(p1.X - p2.X, p1.Y - p2.Y);
}
public static Cairo.PointD Add(this Cairo.PointD p1, Cairo.PointD p2){
return new Cairo.PointD(p1.X + p2.X, p1.Y + p2.Y);
}
public static Cairo.PointD Multiply(this Cairo.PointD p1, double v){
return new Cairo.PointD(p1.X * v, p1.Y * v);
}
public static void DrawCote(this Cairo.Context ctx, Cairo.PointD p1, Cairo.PointD p2, double stroke = 1.0)
{
const double arrowWidth = 4.0;
const double arrowLength = 10.0;
Cairo.PointD vDir = p2.Substract(p1);
vDir = vDir.GetNormalized ();
Cairo.PointD vPerp = vDir.GetPerp ();
Cairo.PointD pA0 = p1.Add(vDir.Multiply(arrowLength));
Cairo.PointD pA1 = p2.Substract(vDir.Multiply(arrowLength));
Cairo.PointD vA = vPerp.Multiply (arrowWidth);
ctx.MoveTo (p1);
ctx.LineTo (pA0.Add (vA));
ctx.LineTo (pA0.Substract (vA));
ctx.LineTo (p1);
ctx.MoveTo (p2);
ctx.LineTo (pA1.Add (vA));
ctx.LineTo (pA1.Substract (vA));
ctx.LineTo (p2);
ctx.Fill ();
ctx.MoveTo (p1);
ctx.LineTo (p2);
ctx.LineWidth = stroke;
ctx.Stroke ();
}
public static void SetSourceColor(this Cairo.Context ctx, Color c)
{
ctx.SetSourceRGBA(c.R,c.G,c.B,c.A);
}
public static void AddColorStop(this Cairo.Gradient grad, double offset, Color c)
{
grad.AddColorStop (offset, new Cairo.Color (c.R, c.G, c.B, c.A));
}
#endregion
public static void Raise(this EventHandler handler, object sender, EventArgs e)
{
if(handler != null)
{
handler(sender, e);
}
}
public static void Raise<T>(this EventHandler<T> handler, object sender, T e)
{
if(handler != null)
{
handler(sender, e);
}
}
public static bool IsWhiteSpaceOrNewLine (this char c)
{
return c == '\t' || c == '\r' || c == '\n' || char.IsWhiteSpace (c);
}
}
}
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