src/rect.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2 /*
   3  * rect.h
   4  *
   5  * Copyright 2007 Novell, Inc. (http://www.novell.com)
   6  *
   7  * See the LICENSE file included with the distribution for details.
   8  *
   9  */
  10
  11 #ifndef __MOON_RECT_H__
  12 #define __MOON_RECT_H__
  13
  14 #include <glib.h>
  15 #include <cairo.h>
  16 #include <math.h>
  17 #include <gdk/gdk.h> // for GdkRectangle
  18
  19 #include "point.h"
  20 #include "thickness.h"
  21 #include "cornerradius.h"
  22
  23 // map to System.Windows.Rect
  24 /* @IncludeInKinds */
  25 struct Rect {
  26  public:
  27         double x, y, width, height;
  28
  29         Rect () : x (0), y (0), width (0), height (0) {}
  30
  31         // to please the current generator when used for a return value
  32         Rect (int zero) : x (0), y (0), width (0), height (0) {}
  33
  34         Rect (double x, double y, double width, double height)
  35         {
  36                 this->x = x;
  37                 this->y = y;
  38                 this->width = width;
  39                 this->height = height;
  40         }
  41
  42         Rect (const Point& p1, const Point& p2)
  43         {
  44                 x = MIN (p1.x, p2.x);
  45                 y = MIN (p1.y, p2.y);
  46                 width = ABS (p1.x - p2.x);
  47                 height = ABS (p1.y - p2.y);
  48         }
  49
  50         Rect Transform (cairo_matrix_t *matrix);
  51
  52         bool PointInside (double px, double py) const
  53         {
  54                 return px >= x && px < (x + width) && py >= y && py < (y + height);
  55         }
  56
  57         bool PointInside (const Point& p) const
  58         {
  59                 return p.x >= x && p.x < (x + width) && p.y >= y && p.y < (y + height);
  60         }
  61
  62         bool IntersectsWith (const Rect& rect) const
  63         {
  64                 return ((x < rect.x + rect.width) && (x + width > rect.x) && (y < rect.y + rect.height) && (y + height > rect.y));
  65         }
  66
  67         bool IsEmpty () const
  68         {
  69                 return IsEmpty (false);
  70         }
  71
  72         bool IsEmpty (bool logical) const
  73         {
  74                 if (logical)
  75                         return ((width <= 0.0) && (height <= 0.0));
  76                 else
  77                         return ((width <= 0.0) || (height <= 0.0));
  78         }
  79
  80         Rect Intersection (const Rect& rect) const
  81         {
  82                 Rect result = Rect ();
  83                 result.x = x > rect.x ? x : rect.x;
  84                 result.y = y > rect.y ? y : rect.y;
  85                 result.width = MAX (0, ((x + width < rect.x + rect.width) ? (x + width) : (rect.x + rect.width)) - result.x);
  86                 result.height = MAX (0, ((y + height < rect.y + rect.height) ? (y + height) : (rect.y + rect.height)) - result.y);
  87                 return result;
  88         }
  89
  90         Rect Union (const Rect& rect) const
  91         {
  92                 return Union (rect, false);
  93         }
  94
  95         // Note about the logical bool: there's now an override for both Rect::Union and
  96         // Rect::IsEmpty that takes a bool. That bool allows union of rectangle with one
  97         // empty extend. This is needed to compute logical bounds for example.
  98         Rect Union (const Rect& rect, bool logical) const
  99         {
 100                 if (IsEmpty (logical))
 101                         return Rect (rect);
 102                 if (logical) {
 103                         if ((rect.width <= 0.0) && (rect.height <= 0.0))
 104                                 return Rect (*this);
 105                 } else {
 106                         if ((rect.width <= 0.0) || (rect.height <= 0.0))
 107                                 return Rect (*this);
 108                 }
 109                 Rect result = Rect ();
 110                 result.x = x < rect.x ? x : rect.x;
 111                 result.y = y < rect.y ? y : rect.y;
 112                 result.width = ((x + width > rect.x + rect.width) ? (x + width) : (rect.x + rect.width)) - result.x;
 113                 result.height = ((y + height > rect.y + rect.height) ? (y + height) : (rect.y + rect.height)) - result.y;
 114                 return result;
 115         }
 116
 117         Rect RoundOut () const
 118         {
 119                 Rect result (floor (x), floor (y), ceil (x + width) - floor (x), ceil (y + height) - floor (y));
 120                 return result;
 121         }
 122
 123         Rect RoundIn () const
 124         {
 125                 Rect result (ceil (x), ceil (y), floor (x + width) - ceil (x), floor (y + height) - ceil (y));
 126                 return result;
 127         }
 128
 129         Rect GrowBy (double left, double top, double right, double bottom) const
 130         {
 131                 Rect result = *this;
 132                 result.x -= left;
 133                 result.y -= top;
 134                 result.width += left + right;
 135                 result.height += top + bottom;
 136
 137                 if (result.width < 0)
 138                         result.width = 0;
 139
 140                 if (result.height < 0)
 141                         result.height = 0;
 142
 143                 return result;
 144         }
 145
 146         Rect GrowBy (double xd, double yd) const
 147         {
 148                 return GrowBy (xd, yd, xd, yd);
 149         }
 150
 151         Rect GrowBy (double d) const
 152         {
 153                 return GrowBy (d, d, d, d);
 154         }
 155
 156         Rect GrowBy (const Thickness &t) const
 157         {
 158                 return GrowBy (t.left, t.top, t.right, t.bottom);
 159         }
 160
 161         Rect ExtendTo (double x, double y) const
 162         {
 163                 Rect result = *this;
 164                 if (x < result.x || x > (result.x + result.width))
 165                         result.width = MAX (ABS(x - result.x), ABS(x - result.x - result.width));
 166                 if (y < result.y || y > (result.y + result.height))
 167                         result.height = MAX (ABS(y - result.y), ABS(y - result.y - result.height));
 168                 result.x = MIN (result.x, x);
 169                 result.y = MIN (result.y, y);
 170
 171                 return result;
 172         }
 173
 174         Rect ExtendTo (const Point& p)
 175         {
 176                 return ExtendTo (p.x, p.y);
 177         }
 178
 179         GdkRectangle
 180         ToGdkRectangle () const
 181         {
 182                 GdkRectangle gdk;
 183                 Rect rect = RoundOut ();
 184                 gdk.x = (gint)rect.x;
 185                 gdk.y = (gint)rect.y;
 186                 gdk.width = (gint)rect.width;
 187                 gdk.height = (gint)rect.height;
 188
 189                 return gdk;
 190         }
 191
 192         bool operator == (const Rect &rect)
 193         {
 194                 return fabs(x-rect.x) < DBL_EPSILON && fabs(y-rect.y) < DBL_EPSILON && fabs(width-rect.width) < DBL_EPSILON && fabs(height-rect.height) < DBL_EPSILON;
 195         }
 196
 197         bool operator != (const Rect &rect)
 198         {
 199                 return !(*this == rect);
 200         }
 201
 202         void Draw (cairo_t *cr) const
 203         {
 204                 cairo_rectangle (cr, x, y, width, height);
 205         }
 206
 207
 208         void Draw (cairo_t *cr, CornerRadius *round) const;
 209
 210         Point GetTopLeft () const
 211         {
 212                 return Point (x, y);
 213         }
 214
 215         Point GetTopRight () const
 216         {
 217                 return Point (x + width, y);
 218         }
 219
 220         Point GetBottomLeft () const
 221         {
 222                 return Point (x, y + height);
 223         }
 224
 225         Point GetBottomRight () const
 226         {
 227                 return Point (x + width, y + height);
 228         }
 229
 230         //
 231         // FromStr
 232         //   Parses @s and return a new rect in @r.  Returns true if
 233         //   this was successful, false otherwise.
 234         //
 235         static bool FromStr (const char *s, Rect *r);
 236 };
 237
 238 #endif /* __MOON_RECT_H__ */