1wxRegion(3)                Erlang Module Definition                wxRegion(3)
2
3
4

NAME

6       wxRegion - Functions for wxRegion class
7

DESCRIPTION

9       A wxRegion represents a simple or complex region on a device context or
10       window.
11
12       This class uses reference counting and copy-on-write internally so that
13       assignments between two instances of this class are very cheap. You can
14       therefore use actual objects instead  of  pointers  without  efficiency
15       problems.  If  an  instance of this class is changed it will create its
16       own data internally so that other instances,  which  previously  shared
17       the data using the reference counting, are not affected.
18
19       Predefined objects (include wx.hrl):
20
21       See: wxRegionIterator (not implemented in wx)
22
23       wxWidgets docs: wxRegion
24

DATA TYPES

26       wxRegion() = wx:wx_object()
27

EXPORTS

29       new() -> wxRegion()
30
31              Default constructor.
32
33              This constructor creates an invalid, or null, object, i.e. call‐
34              ing IsOk() on it returns false and isEmpty/1 returns true.
35
36       new(Rect) -> wxRegion()
37
38       new(Bmp) -> wxRegion()
39
40              Types:
41
42                 Bmp = wxBitmap:wxBitmap()
43
44              Constructs a region using a bitmap.
45
46              See union/5 for more details.
47
48       new(TopLeft, BottomRight) -> wxRegion()
49
50              Types:
51
52                 TopLeft = BottomRight = {X :: integer(), Y :: integer()}
53
54              Constructs a rectangular region from the top left point and  the
55              bottom right point.
56
57       new(X, Y, Width, Height) -> wxRegion()
58
59              Types:
60
61                 X = Y = Width = Height = integer()
62
63              Constructs  a  rectangular  region  with  the given position and
64              size.
65
66       destroy(This :: wxRegion()) -> ok
67
68              Destructor.
69
70              See reference-counted object destruction for more info.
71
72       clear(This) -> ok
73
74              Types:
75
76                 This = wxRegion()
77
78              Clears the current region.
79
80              The object becomes invalid, or null, after being cleared.
81
82       contains(This, Pt) -> wx:wx_enum()
83
84       contains(This, Rect) -> wx:wx_enum()
85
86              Types:
87
88                 This = wxRegion()
89                 Rect =
90                     {X :: integer(),
91                      Y :: integer(),
92                      W :: integer(),
93                      H :: integer()}
94
95              Returns a value indicating whether the given rectangle  is  con‐
96              tained within the region.
97
98              This method always returns wxOutRegion for an invalid region but
99              may, nevertheless, be safely called in this case.
100
101              Return: One of ?wxOutRegion, ?wxPartRegion or ?wxInRegion.
102
103              Note: On Windows, only  ?wxOutRegion  and  ?wxInRegion  are  re‐
104              turned; a value ?wxInRegion then indicates that all or some part
105              of the region is contained in this region.
106
107       contains(This, X, Y) -> wx:wx_enum()
108
109              Types:
110
111                 This = wxRegion()
112                 X = Y = integer()
113
114              Returns a value indicating whether the given point is  contained
115              within the region.
116
117              This method always returns wxOutRegion for an invalid region but
118              may, nevertheless, be safely called in this case.
119
120              Return: The return value is one of wxOutRegion and wxInRegion.
121
122       contains(This, X, Y, Width, Height) -> wx:wx_enum()
123
124              Types:
125
126                 This = wxRegion()
127                 X = Y = Width = Height = integer()
128
129              Returns a value indicating whether the given rectangle  is  con‐
130              tained within the region.
131
132              This method always returns wxOutRegion for an invalid region but
133              may, nevertheless, be safely called in this case.
134
135              Return: One of ?wxOutRegion, ?wxPartRegion or ?wxInRegion.
136
137              Note: On Windows, only  ?wxOutRegion  and  ?wxInRegion  are  re‐
138              turned; a value ?wxInRegion then indicates that all or some part
139              of the region is contained in this region.
140
141       convertToBitmap(This) -> wxBitmap:wxBitmap()
142
143              Types:
144
145                 This = wxRegion()
146
147              Convert the region to a black and white bitmap  with  the  white
148              pixels being inside the region.
149
150              This method can't be used for invalid region.
151
152       getBox(This) ->
153                 {X :: integer(),
154                  Y :: integer(),
155                  W :: integer(),
156                  H :: integer()}
157
158              Types:
159
160                 This = wxRegion()
161
162       intersect(This, Rect) -> boolean()
163
164       intersect(This, Region) -> boolean()
165
166              Types:
167
168                 This = Region = wxRegion()
169
170              Finds the intersection of this region and another region.
171
172              This  method always fails, i.e. returns false, if this region is
173              invalid but may nevertheless be safely used even in this case.
174
175              Return: true if successful, false otherwise.
176
177              Remark: Creates the intersection of the two  regions,  that  is,
178              the  parts  which  are  in both regions. The result is stored in
179              this region.
180
181       intersect(This, X, Y, Width, Height) -> boolean()
182
183              Types:
184
185                 This = wxRegion()
186                 X = Y = Width = Height = integer()
187
188              Finds the intersection of this region and  another,  rectangular
189              region, specified using position and size.
190
191              This  method always fails, i.e. returns false, if this region is
192              invalid but may nevertheless be safely used even in this case.
193
194              Return: true if successful, false otherwise.
195
196              Remark: Creates the intersection of the two  regions,  that  is,
197              the  parts  which  are  in both regions. The result is stored in
198              this region.
199
200       isEmpty(This) -> boolean()
201
202              Types:
203
204                 This = wxRegion()
205
206              Returns true if the region is empty, false otherwise.
207
208              Always returns true if the region is invalid.
209
210       subtract(This, Rect) -> boolean()
211
212       subtract(This, Region) -> boolean()
213
214              Types:
215
216                 This = Region = wxRegion()
217
218              Subtracts a region from this region.
219
220              This method always fails, i.e. returns false, if this region  is
221              invalid but may nevertheless be safely used even in this case.
222
223              Return: true if successful, false otherwise.
224
225              Remark:  This operation combines the parts of 'this' region that
226              are not part of the second region. The result is stored in  this
227              region.
228
229       offset(This, Pt) -> boolean()
230
231              Types:
232
233                 This = wxRegion()
234                 Pt = {X :: integer(), Y :: integer()}
235
236       offset(This, X, Y) -> boolean()
237
238              Types:
239
240                 This = wxRegion()
241                 X = Y = integer()
242
243              Moves the region by the specified offsets in horizontal and ver‐
244              tical directions.
245
246              This method can't be called if  the  region  is  invalid  as  it
247              doesn't make sense to offset it then. Attempts to do it will re‐
248              sult in assert failure.
249
250              Return: true if successful, false otherwise (the region  is  un‐
251              changed then).
252
253       union(This, Region) -> boolean()
254
255       union(This, Rect) -> boolean()
256
257              Types:
258
259                 This = wxRegion()
260                 Rect =
261                     {X :: integer(),
262                      Y :: integer(),
263                      W :: integer(),
264                      H :: integer()}
265
266              Finds the union of this region and another, rectangular region.
267
268              This  method  can be used even if this region is invalid and has
269              the natural behaviour in this case, i.e. makes this region equal
270              to the given rectangle.
271
272              Return: true if successful, false otherwise.
273
274              Remark:  This  operation  creates  a region that combines all of
275              this region and the second region. The result is stored in  this
276              region.
277
278       union(This, Bmp, TransColour) -> boolean()
279
280              Types:
281
282                 This = wxRegion()
283                 Bmp = wxBitmap:wxBitmap()
284                 TransColour = wx:wx_colour()
285
286       union(This, Bmp, TransColour, Options :: [Option]) -> boolean()
287
288              Types:
289
290                 This = wxRegion()
291                 Bmp = wxBitmap:wxBitmap()
292                 TransColour = wx:wx_colour()
293                 Option = {tolerance, integer()}
294
295              Finds the union of this region and the non-transparent pixels of
296              a bitmap.
297
298              Colour to be treated as transparent is specified in  the  trans‐
299              Colour argument, along with an optional colour tolerance value.
300
301              Return: true if successful, false otherwise.
302
303              Remark:  This  operation  creates  a region that combines all of
304              this region and the second region. The result is stored in  this
305              region.
306
307       union(This, X, Y, Width, Height) -> boolean()
308
309              Types:
310
311                 This = wxRegion()
312                 X = Y = Width = Height = integer()
313
314              Finds  the union of this region and another, rectangular region,
315              specified using position and size.
316
317              This method can be used even if this region is invalid  and  has
318              the natural behaviour in this case, i.e. makes this region equal
319              to the given rectangle.
320
321              Return: true if successful, false otherwise.
322
323              Remark: This operation creates a region  that  combines  all  of
324              this  region and the second region. The result is stored in this
325              region.
326
327       'Xor'(This, Rect) -> boolean()
328
329       'Xor'(This, Region) -> boolean()
330
331              Types:
332
333                 This = Region = wxRegion()
334
335              Finds the Xor of this region and another region.
336
337              This method can be used even if this region is invalid  and  has
338              the natural behaviour in this case, i.e. makes this region equal
339              to the given region.
340
341              Return: true if successful, false otherwise.
342
343              Remark: This operation creates a region  that  combines  all  of
344              this  region  and  the second region, except for any overlapping
345              areas. The result is stored in this region.
346
347       'Xor'(This, X, Y, Width, Height) -> boolean()
348
349              Types:
350
351                 This = wxRegion()
352                 X = Y = Width = Height = integer()
353
354              Finds the Xor of this region and  another,  rectangular  region,
355              specified using position and size.
356
357              This  method  can be used even if this region is invalid and has
358              the natural behaviour in this case, i.e. makes this region equal
359              to the given rectangle.
360
361              Return: true if successful, false otherwise.
362
363              Remark:  This  operation  creates  a region that combines all of
364              this region and the second region, except  for  any  overlapping
365              areas. The result is stored in this region.
366
367
368
369wxWidgets team.                    wx 2.2.1                        wxRegion(3)