docs/latex/wx/rect.tex

   1 \section{\class{wxRect}}\label{wxrect}
   2
   3 A class for manipulating rectangles.
   4
   5 \wxheading{Derived from}
   6
   7 None
   8
   9 \wxheading{Include files}
  10
  11 <wx/gdicmn.h>
  12
  13 \wxheading{See also}
  14
  15 \helpref{wxPoint}{wxpoint}, \helpref{wxSize}{wxsize}
  16
  17 \latexignore{\rtfignore{\wxheading{Members}}}
  18
  19
  20 \membersection{wxRect::wxRect}\label{wxrectctor}
  21
  22 \func{}{wxRect}{\void}
  23
  24 Default constructor.
  25
  26 \func{}{wxRect}{\param{int}{ x}, \param{int}{ y}, \param{int}{ width}, \param{int}{ height}}
  27
  28 Creates a wxRect object from x, y, width and height values.
  29
  30 \func{}{wxRect}{\param{const wxPoint\&}{ topLeft}, \param{const wxPoint\&}{ bottomRight}}
  31
  32 Creates a wxRect object from top-left and bottom-right points.
  33
  34 \func{}{wxRect}{\param{const wxPoint\&}{ pos}, \param{const wxSize\&}{ size}}
  35
  36 Creates a wxRect object from position and size values.
  37
  38 \func{}{wxRect}{\param{const wxSize\&}{ size}}
  39
  40 Creates a wxRect object from size values at the origin.
  41
  42
  43 \membersection{wxRect::x}\label{wxrectx}
  44
  45 \member{int}{x}
  46
  47 x coordinate of the top-level corner of the rectangle.
  48
  49
  50 \membersection{wxRect::y}\label{wxrecty}
  51
  52 \member{int}{y}
  53
  54 y coordinate of the top-level corner of the rectangle.
  55
  56
  57 \membersection{wxRect::width}\label{wxrectwidth}
  58
  59 \member{int}{width}
  60
  61 Width member.
  62
  63
  64 \membersection{wxRect::height}\label{wxrectheight}
  65
  66 \member{int}{height}
  67
  68 Height member.
  69
  70
  71 \membersection{wxRect::CentreIn}\label{wxrectcentrein}
  72
  73 \constfunc{wxRect}{CentreIn}{\param{const wxRect\& }{r}, \param{int }{dir = wxBOTH}}
  74
  75 \constfunc{wxRect}{CenterIn}{\param{const wxRect\& }{r}, \param{int }{dir = wxBOTH}}
  76
  77 Returns the rectangle having the same size as this one but centered relatively
  78 to the given rectangle \arg{r}. By default, rectangle is centred in both
  79 directions but if \arg{dir} includes only \texttt{wxVERTICAL} or only
  80 \texttt{wxHORIZONTAL} flag, then it is only centered in this direction while
  81 the other component of its position remains unchanged.
  82
  83
  84 \membersection{wxRect::Deflate}\label{wxrectdeflate}
  85
  86 \func{void}{Deflate}{\param{wxCoord }{dx}, \param{wxCoord }{dy}}
  87
  88 \func{void}{Deflate}{\param{wxCoord }{diff}}
  89
  90 \constfunc{wxRect}{Deflate}{\param{wxCoord }{dx}, \param{wxCoord }{dy}}
  91
  92 Decrease the rectangle size.
  93
  94 This method is the opposite from \helpref{Inflate}{wxrectinflate}:
  95 Deflate(a, b) is equivalent to Inflate(-a, -b).
  96 Please refer to \helpref{Inflate}{wxrectinflate} for full description.
  97
  98 \wxheading{See also}
  99
 100 \helpref{Inflate}{wxrectinflate}
 101
 102
 103 \membersection{wxRect::GetBottom}\label{wxrectgetbottom}
 104
 105 \constfunc{int}{GetBottom}{\void}
 106
 107 Gets the bottom point of the rectangle.
 108
 109
 110 \membersection{wxRect::GetHeight}\label{wxrectgetheight}
 111
 112 \constfunc{int}{GetHeight}{\void}
 113
 114 Gets the height member.
 115
 116
 117 \membersection{wxRect::GetLeft}\label{wxrectgetleft}
 118
 119 \constfunc{int}{GetLeft}{\void}
 120
 121 Gets the left point of the rectangle (the same as \helpref{wxRect::GetX}{wxrectgetx}).
 122
 123
 124 \membersection{wxRect::GetPosition}\label{wxrectgetposition}
 125
 126 \constfunc{wxPoint}{GetPosition}{\void}
 127
 128 Gets the position.
 129
 130
 131 \membersection{wxRect::GetTopLeft}\label{wxrectgettopleft}
 132
 133 \constfunc{wxPoint}{GetTopLeft}{\void}
 134
 135 Gets the topleft position of the rectangle. (Same as GetPosition).
 136
 137
 138 \membersection{wxRect::GetBottomRight}\label{wxrectgetbottomright}
 139
 140 \constfunc{wxPoint}{GetBottomRight}{\void}
 141
 142 Gets the bottom right position. Returns the bottom right point inside the rectangle.
 143
 144
 145 \membersection{wxRect::GetRight}\label{wxrectgetright}
 146
 147 \constfunc{int}{GetRight}{\void}
 148
 149 Gets the right point of the rectangle.
 150
 151
 152 \membersection{wxRect::GetSize}\label{wxrectgetsize}
 153
 154 \constfunc{wxSize}{GetSize}{\void}
 155
 156 Gets the size.
 157
 158 \wxheading{See also}
 159
 160 \helpref{wxRect::SetSize}{wxrectsetsize}
 161
 162
 163 \membersection{wxRect::GetTop}\label{wxrectgettop}
 164
 165 \constfunc{int}{GetTop}{\void}
 166
 167 Gets the top point of the rectangle (the same as \helpref{wxRect::GetY}{wxrectgety}).
 168
 169
 170 \membersection{wxRect::GetWidth}\label{wxrectgetwidth}
 171
 172 \constfunc{int}{GetWidth}{\void}
 173
 174 Gets the width member.
 175
 176
 177 \membersection{wxRect::GetX}\label{wxrectgetx}
 178
 179 \constfunc{int}{GetX}{\void}
 180
 181 Gets the x member.
 182
 183
 184 \membersection{wxRect::GetY}\label{wxrectgety}
 185
 186 \constfunc{int}{GetY}{\void}
 187
 188 Gets the y member.
 189
 190
 191 \membersection{wxRect::Inflate}\label{wxrectinflate}
 192
 193 \func{void}{Inflate}{\param{wxCoord }{dx}, \param{wxCoord }{dy}}
 194
 195 \func{void}{Inflate}{\param{wxCoord }{diff}}
 196
 197 \constfunc{wxRect}{Inflate}{\param{wxCoord }{dx}, \param{wxCoord }{dy}}
 198
 199 Increases the size of the rectangle.
 200
 201 The second form uses the same {\it diff} for both {\it dx} and {\it dy}.
 202
 203 The first two versions modify the rectangle in place, the last one returns a
 204 new rectangle leaving this one unchanged.
 205
 206 The left border is moved farther left and the right border is moved farther
 207 right by {\it dx}. The upper border is moved farther up and the bottom border
 208 is moved farther down by {\it dy}. (Note the the width and height of the
 209 rectangle thus change by 2*{\it dx} and 2*{\it dy}, respectively.) If one or
 210 both of {\it dx} and {\it dy} are negative, the opposite happens: the rectangle
 211 size decreases in the respective direction.
 212
 213 Inflating and deflating behaves ``naturally''. Defined more precisely, that
 214 means:
 215 \begin{enumerate}
 216     \item ``Real'' inflates (that is, {\it dx} and/or {\it dy} >= 0) are not
 217         constrained. Thus inflating a rectangle can cause its upper left corner
 218         to move into the negative numbers. (the versions prior to 2.5.4 forced
 219         the top left coordinate to not fall below (0, 0), which implied a
 220         forced move of the rectangle.)
 221
 222     \item Deflates are clamped to not reduce the width or height of the
 223         rectangle below zero. In such cases, the top-left corner is nonetheless
 224         handled properly. For example, a rectangle at (10, 10) with size (20,
 225         40) that is inflated by (-15, -15) will become located at (20, 25) at
 226         size (0, 10). Finally, observe that the width and height are treated
 227         independently. In the above example, the width is reduced by 20,
 228         whereas the height is reduced by the full 30 (rather than also stopping
 229         at 20, when the width reached zero).
 230 \end{enumerate}
 231
 232 \wxheading{See also}
 233
 234 \helpref{Deflate}{wxrectdeflate}
 235
 236
 237 \membersection{wxRect::Inside}\label{wxrectinside}
 238
 239 \constfunc{bool}{Inside}{\param{int }{x}, \param{int }{y}}
 240
 241 \constfunc{bool}{Inside}{\param{const wxPoint\& }{pt}}
 242
 243 Returns {\tt true} if the given point is inside the rectangle (or on its
 244 boundary) and {\tt false} otherwise.
 245
 246
 247 \membersection{wxRect::Intersects}\label{wxrectintersects}
 248
 249 \constfunc{bool}{Intersects}{\param{const wxRect\& }{rect}}
 250
 251 Returns {\tt true} if this rectangle has a non empty intersection with the
 252 rectangle {\it rect} and {\tt false} otherwise.
 253
 254
 255 \membersection{wxRect::IsEmpty}\label{wxrectisempty}
 256
 257 \constfunc{bool}{IsEmpty}{}
 258
 259 Returns {\tt true} if this rectangle has a width or height less than or equal to
 260 0 and {\tt false} otherwise.
 261
 262
 263 \membersection{wxRect::Offset}\label{wxrectoffset}
 264
 265 \func{void}{Offset}{\param{wxCoord }{dx}, \param{wxCoord }{dy}}
 266
 267 \func{void}{Offset}{\param{const wxPoint\& }{pt}}
 268
 269 Moves the rectangle by the specified offset. If {\it dx} is positive, the
 270 rectangle is moved to the right, if {\it dy} is positive, it is moved to the
 271 bottom, otherwise it is moved to the left or top respectively.
 272
 273
 274 \membersection{wxRect::SetHeight}\label{wxrectsetheight}
 275
 276 \func{void}{SetHeight}{\param{int}{ height}}
 277
 278 Sets the height.
 279
 280
 281 \membersection{wxRect::SetSize}\label{wxrectsetsize}
 282
 283 \func{void}{SetSize}{\param{const wxSize\&}{ s}}
 284
 285 Sets the size.
 286
 287 \wxheading{See also}
 288
 289 \helpref{wxRect::GetSize}{wxrectgetsize}
 290
 291
 292 \membersection{wxRect::SetWidth}\label{wxrectsetwidth}
 293
 294 \func{void}{SetWidth}{\param{int}{ width}}
 295
 296 Sets the width.
 297
 298
 299 \membersection{wxRect::SetX}\label{wxrectsetx}
 300
 301 \func{void}{SetX}{\param{int}{ x}}
 302
 303 Sets the x position.
 304
 305
 306 \membersection{wxRect::SetY}\label{wxrectsety}
 307
 308 \func{void}{SetY}{\param{int}{ y}}
 309
 310 Sets the y position.
 311
 312
 313 \membersection{wxRect::Union}\label{wxrectunion}
 314
 315 \constfunc{wxRect}{Union}{\param{const wxRect\&}{ rect}}
 316
 317 \func{wxRect\&}{Union}{\param{const wxRect\&}{ rect}}
 318
 319 Modifies the rectangle to contain the bounding box of this rectangle and the
 320 one passed in as parameter. The const version returns the new rectangle, the
 321 other one modifies this rectangle in place.
 322
 323
 324 \membersection{wxRect::operator $=$}\label{wxrectassign}
 325
 326 \func{void}{operator $=$}{\param{const wxRect\& }{rect}}
 327
 328 Assignment operator.
 329
 330
 331 \membersection{wxRect::operator $==$}\label{wxrectequal}
 332
 333 \func{bool}{operator $==$}{\param{const wxRect\& }{rect}}
 334
 335 Equality operator.
 336
 337
 338 \membersection{wxRect::operator $!=$}\label{wxrectnotequal}
 339
 340 \func{bool}{operator $!=$}{\param{const wxRect\& }{rect}}
 341
 342 Inequality operator.
 343