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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace go
{
public static class CairoHelpers
{
public static T Clamp<T>(this T val, T min, T max) where T : IComparable<T>
{
if (val.CompareTo(min) < 0) return min;
else if(val.CompareTo(max) > 0) return max;
else return val;
}
/// <summary>
/// Convert string to utf8 (extension method)
/// </summary>
/// <returns>byte array with utf8 encoding</returns>
public static byte[] ToUtf8(this String str)
{
return System.Text.UTF8Encoding.UTF8.GetBytes (str);
}
public static double min(params double[] arr)
{
int minp = 0;
for (int i = 1; i < arr.Length; i++)
if (arr[i] < arr[minp])
minp = i;
return arr[minp];
}
public static void CairoRectangle(Cairo.Context gr, Rectangle r, double radius)
{
if (radius>0)
CairoHelpers.DrawRoundedRectangle(gr,r,radius);
else
gr.Rectangle (r);
}
public static void CairoCircle(Cairo.Context gr, Rectangle r)
{
gr.Arc(r.X + r.Width/2, r.Y + r.Height/2, Math.Min(r.Width,r.Height)/2, 0, 2*Math.PI);
}
public static void DrawRoundedRectangle(Cairo.Context gr, Rectangle r, double radius)
{
DrawRoundedRectangle(gr, r.X, r.Y, r.Width, r.Height, radius);
}
public static void DrawCurvedRectangle(Cairo.Context gr, Rectangle r)
{
DrawCurvedRectangle(gr, r.X, r.Y, r.Width, r.Height);
}
public static void DrawRoundedRectangle(Cairo.Context gr, double x, double y, double width, double height, double radius)
{
gr.Save();
if ((radius > height / 2) || (radius > width / 2))
radius = min(height / 2, width / 2);
gr.MoveTo(x, y + radius);
gr.Arc(x + radius, y + radius, radius, Math.PI, -Math.PI / 2);
gr.LineTo(x + width - radius, y);
gr.Arc(x + width - radius, y + radius, radius, -Math.PI / 2, 0);
gr.LineTo(x + width, y + height - radius);
gr.Arc(x + width - radius, y + height - radius, radius, 0, Math.PI / 2);
gr.LineTo(x + radius, y + height);
gr.Arc(x + radius, y + height - radius, radius, Math.PI / 2, Math.PI);
gr.ClosePath();
gr.Restore();
}
public static void DrawCurvedRectangle(Cairo.Context gr, double x, double y, double width, double height)
{
gr.Save();
gr.MoveTo(x, y + height / 2);
gr.CurveTo(x, y, x, y, x + width / 2, y);
gr.CurveTo(x + width, y, x + width, y, x + width, y + height / 2);
gr.CurveTo(x + width, y + height, x + width, y + height, x + width / 2, y + height);
gr.CurveTo(x, y + height, x, y + height, x, y + height / 2);
gr.Restore();
}
public static void StrokeRaisedRectangle(Cairo.Context gr, Rectangle r, double width = 1)
{
gr.Save();
r.Inflate((int)-width / 2, (int)-width / 2);
gr.LineWidth = width;
gr.Color = Color.White;
gr.MoveTo(r.BottomLeft);
gr.LineTo(r.TopLeft);
gr.LineTo(r.TopRight);
gr.Stroke();
gr.Color = Color.DarkGray;
gr.MoveTo(r.TopRight);
gr.LineTo(r.BottomRight);
gr.LineTo(r.BottomLeft);
gr.Stroke();
gr.Restore();
}
public static void StrokeLoweredRectangle(Cairo.Context gr, Rectangle r, double width = 1)
{
gr.Save();
r.Inflate((int)-width / 2, (int)-width / 2);
gr.LineWidth = width;
gr.Color = Color.DarkGray;
gr.MoveTo(r.BottomLeft);
gr.LineTo(r.TopLeft);
gr.LineTo(r.TopRight);
gr.Stroke();
gr.Color = Color.White;
gr.MoveTo(r.TopRight);
gr.LineTo(r.BottomRight);
gr.LineTo(r.BottomLeft);
gr.Stroke();
gr.Restore();
}
}
}
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