2 // fileio.cpp: Architektonas file save/load support
4 // Part of the Architektonas Project
5 // (C) 2013 Underground Software
6 // See the README and GPLv3 files for licensing and warranty information
8 // JLH = James Hammons <jlhamm@acm.org>
11 // --- ---------- -------------------------------------------------------------
12 // JLH 02/20/2013 Created this file
23 #include "container.h"
24 #include "dimension.h"
28 How to handle connected objects
29 -------------------------------
31 Every Object has a vector<Object *> which enumerates all Objects connected to
32 the one we're looking at. So it looks like we'll have to take a two pass
33 approach to loading and saving.
35 Basically, in the saving case, first we write out all objects, keeping a
36 pointer-to-index-number record. Second, we loop through all the objects we
37 wrote out, writing connection lists. Format (indices are 1-based):
45 In the reading case, we do pretty much the same: we construct pointer-to-index-
46 number list, then read the connection list. The PTIN connects the index to the
47 Object pointers we've created. Then we simply call the Object's Connect()
48 function to connect the objects.
50 Small problem though: How does a Dimension know which points on a Line it's
51 connected to? This approach tells the Dimension it's connected to the Line and
52 the Line that it's connected to the Dimension, but not which points.
54 How to handle them then? Do we list the point with the Object pointed at? A
55 Line can contain an infinite number of points to connect with besides its
58 So with each connection Object in the vector, there would also have to be a
59 corresponding point to go with it, that would be gotten from the other Object's
60 Connect() function. Or, instead of a point, a parameter value?
62 Doing that, with the Line and a parameter "t", if t == 0 we have endpoint 1.
63 if t == 1, then we have endpoint 2. With a Circle, the parameter is a number
64 between 0 and 1 (scaled to 0 to 2π). With an Arc, the parameter goes from 0 to
65 1, 0 being enpoint 1 and 1 being endpoint 2.
67 How does this work for moving objects that are connected? Again, with the Line
68 and Dimension. The Line's connections looks like this:
73 Dimension looks like this:
75 Object *: line1, t = 0
76 Object *: line1, t = 1
78 For Dimensions, it can query the connected object (if any) using something like
79 GetPointForParameter(). That way it can figure out where its endpoints are. If
80 there is no connected point, then it uses its internal point.
83 Dimensions are special cases of lines: They have exactly *two* points and none
84 in between. Therefore, the Dimension object only needs to have two points. But
85 those points can be connected to multiple objects. The can also be connected to
86 no points/Objects too.
88 How to describe them and their connections (or lack thereof)?
90 Would have to be a 2nd pass, after all objects have been written out in order.
91 Then you could do something like:
94 8 (the Dimension #): 1 (the Object # for point 1) 1 (the Object # for point 2)
99 Connection attributes: E.g., between a Line a Circle, it can be tangent,
100 perpendicular, or an arbitrary angle. How to encode that information? It's not
101 intrinsic to either the Line or the Circle, but is a function of the
102 relationship between them by virtue of their connection.
106 enum ObjectType { OTContainer, OTContainerEnd, OTLine, OTCircle, OTArc, OTDimension,
107 OTPolygon, OTText, OTImage, OTBlock, OTEndOfFile };
110 /*static*/ bool FileIO::SaveAtnsFile(FILE * file, Container * object)
112 /* Approach: loop through the container, doing a depth-first traversal. Any extra
113 containers found are looped through until there aren't any more down, then
114 ordinary objects are described. This can be handled by a virtual Object function
115 that reports the object by itself if it's a non-Container, otherwise it
116 enumerates all objects within itself. */
118 fprintf(file, "ARCHITEKTONAS DRAWING V1.0\n");
120 object->Enumerate(file);
121 fprintf(file, "END\n");
129 /*static*/ bool FileIO::LoadAtnsFile(FILE * file, Container * drawing)
134 fscanf(file, "ARCHITEKTONAS DRAWING V%f", &version);
136 //printf("Load: version = %f\n", version);
139 /* Approach: read each object in the file, one by one. If the object is a Container,
140 add objects to it until an "endContainer" marker is found. This will require a
141 stack to maintain the current Container. */
144 std::vector<Container *> containerStack;
145 Container * currentTopContainer = drawing;//new Container(Vector(0, 0));
147 // ObjectType objectType;
152 if (FileIO::GetObjectFromFile(file, currentTopContainer, &object, &objectType) == false)
155 // object->type down below can be replaced with objType.
156 // Above could be: bool FileIO::GetObjectFromFile(FILE *, Object *, ObjectType *);
157 // where the return value tells if it's a valid object, Object * returns the
158 // reconstructed object and ObjectType * returns the object type.
160 if (objectType == OTEndOfFile)
162 printf("Load: container size = %li\n", drawing->objects.size());
165 else if (objectType == OTContainer)
167 containerStack.push_back(currentTopContainer);
168 currentTopContainer = new Container(Vector(0, 0), currentTopContainer);
170 else if (objectType == OTContainerEnd)
172 Container * containerToAdd = currentTopContainer;
173 currentTopContainer = containerStack.back();
174 containerStack.pop_back();
175 currentTopContainer->Add(containerToAdd);
179 currentTopContainer->Add(object);
180 printf("Load: Adding object. Container size = %li (%li)\n", drawing->objects.size(), currentTopContainer->objects.size());
191 /*static*/ bool FileIO::GetObjectFromFile(FILE * file, Object * parent, Object ** object, int * objectType)
194 fscanf(file, "%s ", buffer);
195 bool recognized = false;
196 //printf("Load: buffer = \"%s\"\n", buffer);
198 if (strcmp(buffer, "LINE") == 0)
200 //printf(" Found LINE.\n");
203 fscanf(file, "(%lf,%lf) (%lf,%lf)", &v1.x, &v1.y, &v2.x, &v2.y);
204 //printf(" Number of params recognized: %i\n", n);
205 *object = new Line(v1, v2, parent);
206 *objectType = OTLine;
208 else if (strcmp(buffer, "CIRCLE") == 0)
213 fscanf(file, "(%lf,%lf) %lf", &v.x, &v.y, &r);
214 *object = new Circle(v, r, parent);
215 *objectType = OTCircle;
217 else if (strcmp(buffer, "ARC") == 0)
222 fscanf(file, "(%lf,%lf) %lf, %lf, %lf", &v.x, &v.y, &r, &a1, &a2);
223 *object = new Arc(v, r, a1, a2, parent);
226 else if (strcmp(buffer, "DIMENSION") == 0)
231 fscanf(file, "(%lf,%lf) (%lf,%lf) %i", &v1.x, &v1.y, &v2.x, &v2.y, &type);
232 *object = new Dimension(v1, v2, type, parent);
233 *objectType = OTDimension;
235 else if (strcmp(buffer, "CONTAINER") == 0)
238 *objectType = OTContainer;
240 else if (strcmp(buffer, "ENDCONTAINER") == 0)
243 *objectType = OTContainerEnd;
245 else if (strcmp(buffer, "END") == 0)
248 *objectType = OTEndOfFile;