1 // dimension.cpp: Dimension object
3 // Part of the Architektonas Project
4 // (C) 2011 Underground Software
5 // See the README and GPLv3 files for licensing and warranty information
7 // JLH = James Hammons <jlhamm@acm.org>
10 // --- ---------- ------------------------------------------------------------
11 // JLH 04/04/2011 Created this file, basic rendering
12 // JLH 03/14/2013 Updated to new connection system
15 #include "dimension.h"
18 #include "mathconstants.h"
22 Dimension::Dimension(Vector p1, Vector p2, DimensionType dt/*= DTLinear*/ ,Object * p/*= NULL*/):
23 Object(p1, p), endpoint(p2),
24 dragging(false), draggingHandle1(false), draggingHandle2(false),
25 length(p2.Magnitude()), dimensionType(dt), size(0.25), point1(NULL), point2(NULL)
27 // We set the size to 1/4 base unit. Could be anything.
32 // This is bad, p1 & p2 could be NULL, causing much consternation...
33 Dimension::Dimension(Connection p1, Connection p2, DimensionType dt/*= DTLinear*/ , Object * p/*= NULL*/):
34 dragging(false), draggingHandle1(false), draggingHandle2(false),
35 length(0), dimensionType(dt), size(0.25), point1(p1), point2(p2)
41 Dimension::~Dimension()
46 /*virtual*/ void Dimension::Draw(Painter * painter)
48 // If there are valid Vector pointers in here, use them to update the internal
49 // positions. Otherwise, we just use the internal positions by default.
51 position = point1.object->GetPointAtParameter(point1.t);
54 endpoint = point2.object->GetPointAtParameter(point2.t);
56 if (state == OSSelected)
57 painter->SetPen(QPen(Qt::red, 2.0, Qt::DotLine));
59 // painter->SetPen(QPen(Qt::blue, 1.0, Qt::SolidLine));
60 painter->SetPen(QPen(Qt::blue, 1.0 * Painter::zoom * size, Qt::SolidLine));
62 painter->SetBrush(QBrush(QColor(Qt::blue)));
64 // Draw an aligned dimension line
65 double angle = Vector(endpoint - position).Angle();
66 double orthoAngle = angle + (PI / 2.0);
67 Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
68 Vector unit = Vector(endpoint - position).Unit();
71 // Point p1 = head - (unit * 9.0 * size);
72 // Point p2 = p1 + (orthogonal * 3.0 * size);
73 // Point p3 = p1 - (orthogonal * 3.0 * size);
76 The numbers hardcoded into here, what are they?
77 I believe they are pixels.
80 // Get our line parallel to our points
81 Point p1 = position + (orthogonal * 10.0 * size);
82 Point p2 = endpoint + (orthogonal * 10.0 * size);
84 Point p3 = position + (orthogonal * 16.0 * size);
85 Point p4 = endpoint + (orthogonal * 16.0 * size);
86 Point p5 = position + (orthogonal * 4.0 * size);
87 Point p6 = endpoint + (orthogonal * 4.0 * size);
89 // Draw extension lines
90 painter->DrawLine(p3, p5);
91 painter->DrawLine(p4, p6);
93 // Calculate whether or not the arrowheads are too crowded to put inside
94 // the extension lines. 9.0 is the length of the arrowhead.
95 // double t = Vector::Parameter(position, endpoint, endpoint - (unit * 9.0 * size));
96 // double t = Vector::Parameter(position, endpoint, position + (unit * 9.0 * size));
97 double t = Vector::Parameter(endpoint, position, position + (unit * 9.0 * size));
98 //printf("Dimension::Draw(): t = %lf\n", t);
100 // On the screen, it's acting like this is actually 58%...
101 // This is correct, we want it to happen at > 50%
104 // Draw main dimension line + arrowheads
105 painter->DrawLine(p1, p2);
106 painter->DrawArrowhead(p1, p2, size);
107 painter->DrawArrowhead(p2, p1, size);
111 Point p7 = p1 - (unit * 9.0 * size);
112 Point p8 = p2 + (unit * 9.0 * size);
113 painter->DrawArrowhead(p1, p7, size);
114 painter->DrawArrowhead(p2, p8, size);
115 painter->DrawLine(p1, p1 - (unit * 14.0 * size));
116 painter->DrawLine(p2, p2 + (unit * 14.0 * size));
119 // Draw length of dimension line...
120 painter->SetFont(QFont("Arial", 8.0 * Painter::zoom * size));
121 Vector v1((p1.x - p2.x) / 2.0, (p1.y - p2.y) / 2.0);
123 QString dimText = QString("%1\"").arg(Vector(endpoint - position).Magnitude());
124 painter->DrawAngledText(ctr, angle, dimText, size);
128 /*virtual*/ Vector Dimension::Center(void)
130 // Technically, this is the midpoint but who are we to quibble? :-)
131 Vector v((position.x - endpoint.x) / 2.0, (position.y - endpoint.y) / 2.0);
136 /*virtual*/ bool Dimension::Collided(Vector /*point*/)
139 objectWasDragged = false;
140 Vector lineSegment = endpoint - position;
141 Vector v1 = point - position;
142 Vector v2 = point - endpoint;
143 double parameterizedPoint = lineSegment.Dot(v1) / lineSegment.Magnitude(), distance;
145 // Geometric interpretation:
146 // pp is the paremeterized point on the vector ls where the perpendicular intersects ls.
147 // If pp < 0, then the perpendicular lies beyond the 1st endpoint. If pp > length of ls,
148 // then the perpendicular lies beyond the 2nd endpoint.
150 if (parameterizedPoint < 0.0)
151 distance = v1.Magnitude();
152 else if (parameterizedPoint > lineSegment.Magnitude())
153 distance = v2.Magnitude();
154 else // distance = ?Det?(ls, v1) / |ls|
155 distance = fabs((lineSegment.x * v1.y - v1.x * lineSegment.y) / lineSegment.Magnitude());
157 // If the segment endpoints are s and e, and the point is p, then the test for the perpendicular
158 // intercepting the segment is equivalent to insisting that the two dot products {s-e}.{s-p} and
159 // {e-s}.{e-p} are both non-negative. Perpendicular distance from the point to the segment is
160 // computed by first computing the area of the triangle the three points form, then dividing by the
161 // length of the segment. Distances are done just by the Pythagorean theorem. Twice the area of the
162 // triangle formed by three points is the determinant of the following matrix:
168 // By translating the start point to the origin, this can be rewritten as:
169 // By subtracting row 1 from all rows, you get the following:
170 // [because sx = sy = 0. you could leave out the -sx/y terms below. because we subtracted
171 // row 1 from all rows (including row 1) row 1 turns out to be zero. duh!]
174 // (ex - sx) (ey - sy) 0 ==> ex ey 0
175 // (px - sx) (py - sy) 0 px py 0
177 // which greatly simplifies the calculation of the determinant.
179 if (state == OSInactive)
181 //printf("Line: pp = %lf, length = %lf, distance = %lf\n", parameterizedPoint, lineSegment.Magnitude(), distance);
182 //printf(" v1.Magnitude = %lf, v2.Magnitude = %lf\n", v1.Magnitude(), v2.Magnitude());
183 //printf(" point = %lf,%lf,%lf; p1 = %lf,%lf,%lf; p2 = %lf,%lf,%lf\n", point.x, point.y, point.z, position.x, position.y, position.z, endpoint.x, endpoint.y, endpoint.z);
185 //How to translate this into pixels from Document space???
186 //Maybe we need to pass a scaling factor in here from the caller? That would make sense, as
187 //the caller knows about the zoom factor and all that good kinda crap
188 if (v1.Magnitude() < 10.0)
192 oldPoint = position; //maybe "position"?
193 draggingHandle1 = true;
196 else if (v2.Magnitude() < 10.0)
200 oldPoint = endpoint; //maybe "position"?
201 draggingHandle2 = true;
204 else if (distance < 2.0)
213 else if (state == OSSelected)
215 // Here we test for collision with handles as well! (SOON!)
218 if (v1.Magnitude() < 2.0) // Handle #1
219 else if (v2.Magnitude() < 2.0) // Handle #2
224 // state = OSInactive;
237 /*virtual*/ void Dimension::PointerMoved(Vector point)
239 // We know this is true because mouse move messages don't come here unless
240 // the object was actually clicked on--therefore we *know* we're being
242 objectWasDragged = true;
246 // Here we need to check whether or not we're dragging a handle or the object itself...
247 Vector delta = point - oldPoint;
255 else if (draggingHandle1)
257 Vector delta = point - oldPoint;
264 else if (draggingHandle2)
266 Vector delta = point - oldPoint;
278 /*virtual*/ void Dimension::PointerReleased(void)
280 if (draggingHandle1 || draggingHandle2)
282 // Set the length (in case the global state was set to fixed (or not))
283 if (Object::fixedLength)
286 if (draggingHandle1) // startpoint
288 Vector v = Vector(position - endpoint).Unit() * length;
289 position = endpoint + v;
293 // Vector v1 = endpoint - position;
294 Vector v = Vector(endpoint - position).Unit() * length;
295 endpoint = position + v;
300 // Otherwise, we calculate the new length, just in case on the next move
301 // it turns out to have a fixed length. :-)
302 length = Vector(endpoint - position).Magnitude();
307 draggingHandle1 = false;
308 draggingHandle2 = false;
310 // Here we check for just a click: If object was clicked and dragged, then
311 // revert to the old state (OSInactive). Otherwise, keep the new state that
313 /*Maybe it would be better to just check for "object was dragged" state and not have to worry
314 about keeping track of old states...
316 if (objectWasDragged)
321 /*virtual*/ void Dimension::Enumerate(FILE * file)
323 fprintf(file, "DIMENSION (%lf,%lf) (%lf,%lf) %i\n", position.x, position.y, endpoint.x, endpoint.y, type);
327 /*virtual*/ Object * Dimension::Copy(void)
329 #warning "!!! This doesn't take care of attached Dimensions !!!"
331 This is a real problem. While having a pointer in the Dimension to this line's points
332 is fast & easy, it creates a huge problem when trying to replicate an object like this.
334 Maybe a way to fix that then, is to have reference numbers instead of pointers. That
335 way, if you copy them, ... you might still have problems. Because you can't be sure if
336 a copy will be persistant or not, you then *definitely* do not want them to have the
337 same reference number.
340 Dimension * d = new Dimension(position, endpoint, dimensionType, parent);
346 // Dimensions are special: they contain exactly *two* points. Here, we check
347 // only for zero/non-zero in returning the correct points.
348 /*virtual*/ Vector Dimension::GetPointAtParameter(double parameter)
357 /*virtual*/ void Dimension::Connect(Object * obj, double param)
359 // There are four possibilities here...
360 // The param is only looking for 0 or 1 here.
361 if (point1.object == NULL && point2.object == NULL)
366 else if (point1.object == NULL && point2.object != NULL)
368 if (point2.t == param)
376 else if (point1.object != NULL && point2.object == NULL)
378 if (point1.t == param)
386 else if (point1.object != NULL && point2.object != NULL)
388 if (point1.t == param)
396 /*virtual*/ void Dimension::Disconnect(Object * obj, double param)
398 if (point1.object == obj && point1.t == param)
399 point1.object = NULL;
400 else if (point2.object == obj && point2.t == param)
401 point2.object = NULL;
405 /*virtual*/ void Dimension::DisconnectAll(Object * obj)
407 if (point1.object == obj)
408 point1.object = NULL;
410 if (point2.object == obj)
411 point2.object = NULL;
415 /*virtual*/ QRectF Dimension::Extents(void)
421 p1 = point1.object->GetPointAtParameter(point1.t);
424 p2 = point2.object->GetPointAtParameter(point2.t);
426 return QRectF(QPointF(p1.x, p1.y), QPointF(p2.x, p2.y));
431 /*virtual*/ ObjectType Dimension::Type(void)
438 void Dimension::FlipSides(void)
441 Vector tmp = position;
445 Connection tmp = point1;
448 // double tmp = point1.t;
449 // point1.t = point2.t;
451 // Object * tmp = point1.object;
452 // point1.object = point2.object;
453 // point2.object = tmp;