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 03/22/2011 Created this file
12 // JLH 09/29/2011 Added middle mouse button panning
17 // - Redo rendering code to *not* use Qt's transform functions, as they are tied
18 // to a left-handed system and we need a right-handed one. [DONE]
24 // Uncomment this for debugging...
26 //#define DEBUGFOO // Various tool debugging...
27 //#define DEBUGTP // Toolpalette debugging...
29 #include "drawingview.h"
32 #include "mathconstants.h"
36 #include "dimension.h"
41 #define BACKGROUND_MAX_SIZE 512
44 DrawingView::DrawingView(QWidget * parent/*= NULL*/): QWidget(parent),
45 // The value in the settings file will override this.
46 useAntialiasing(true),
47 gridBackground(BACKGROUND_MAX_SIZE, BACKGROUND_MAX_SIZE),
48 scale(1.0), offsetX(-10), offsetY(-10),
49 document(Vector(0, 0)),
50 gridSpacing(12.0), gridPixels(0), collided(false), rotateTool(false),
52 scrollDrag(false), addLineTool(false), addCircleTool(false),
53 addDimensionTool(false),
56 document.isTopLevelContainer = true;
57 setBackgroundRole(QPalette::Base);
58 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
60 // toolPalette = new ToolWindow();
62 // setCursor(cur[TOOLSelect]);
63 // setMouseTracking(true);
65 Line * line = new Line(Vector(5, 5), Vector(50, 40), &document);
67 document.Add(new Line(Vector(50, 40), Vector(10, 83), &document));
68 document.Add(new Line(Vector(10, 83), Vector(17, 2), &document));
69 document.Add(new Circle(Vector(100, 100), 36, &document));
70 document.Add(new Circle(Vector(50, 150), 49, &document));
71 document.Add(new Arc(Vector(300, 300), 32, PI / 4.0, PI * 1.3, &document)),
72 document.Add(new Arc(Vector(200, 200), 60, PI / 2.0, PI * 1.5, &document));
74 Dimension * dimension = new Dimension(Vector(0, 0), Vector(0, 0), DTLinear, &document);
75 line->SetDimensionOnLine(dimension);
76 document.Add(dimension);
78 // Alternate way to do the above...
79 line->SetDimensionOnLine();
83 Here we set the grid size in pixels--12 in this case. Initially, we have our
84 zoom set to make this represent 12 inches at a zoom factor of 25%. (This is
85 arbitrary.) So, to be able to decouple the grid size from the zoom, we need
86 to be able to set the size of the background grid (which we do here at an
87 arbitrary 12 pixels) to anything we want (within reason, of course :-).
89 The drawing enforces the grid spacing through the drawing->gridSpacing variable.
91 drawing->gridSpacing = 12.0 / Painter::zoom;
93 Painter::zoom is the zoom factor for the drawing, and all mouse clicks are
94 translated to Cartesian coordinates through this. (Initially, Painter::zoom is
95 set to 1.0. SCREEN_ZOOM is set to 1.0/4.0.)
97 Really, the 100% zoom level can be set at *any* zoom level, it's more of a
98 convenience function than any measure of absolutes. Doing things that way we
99 could rid ourselves of the whole SCREEN_ZOOM parameter and all the attendant
100 shittyness that comes with it.
102 However, it seems that SCREEN_ZOOM is used to make text and arrow sizes show up
103 a certain way, which means we should probably create something else in those
104 objects to take its place--like some kind of scale factor. This would seem to
105 imply that certain point sizes actually *do* tie things like fonts to absolute
106 sizes on the screen, but not necessarily because you could have an inch scale
107 with text that is quite small relative to other objects on the screen, which
108 currently you have to zoom in to see (and which blows up the text). Point sizes
109 in an application like this are a bit meaningless; even though an inch is an
110 inch regardless of the zoom level a piece of text can be larger or smaller than
111 this. Maybe this is the case for having a base unit and basing point sizes off
114 Here's what's been figured out. Painter::zoom is simply the ratio of pixels to
115 base units. What that means is that if you have a 12px grid with a 6" grid size
116 (& base unit of "inches"), Painter::zoom becomes 12px / 6" = 2.0 px/in.
118 Dimensions now have a "size" parameter to set their absolute size in relation
119 to the base unit. ATM, the arrows are drawn in pixels, but also scaled by
120 Painter::zoom *and* size. Same with the dimension text; it's drawn at 10pt and
121 scaled the same way as the arrowheads.
123 Need a way to scale line widths as well. :-/ Shouldn't be too difficult, just
124 need a thickness parameter similar to the "size" param for dimensions. (And now
132 void DrawingView::SetRotateToolActive(bool state/*= true*/)
139 void DrawingView::SetToolActive(Action * action)
144 connect(toolAction, SIGNAL(ObjectReady(Object *)), this,
145 SLOT(AddNewObjectToDocument(Object *)));
150 void DrawingView::SetGridSize(uint32_t size)
153 if (size == gridPixels)
156 // Recreate the background bitmap
158 QPainter pmp(&gridBackground);
159 pmp.fillRect(0, 0, BACKGROUND_MAX_SIZE, BACKGROUND_MAX_SIZE, QColor(240, 240, 240));
160 pmp.setPen(QPen(QColor(210, 210, 255), 2.0, Qt::SolidLine));
162 for(int i=0; i<(BACKGROUND_MAX_SIZE-1); i+=gridPixels)
164 pmp.drawLine(i, 0, i, BACKGROUND_MAX_SIZE - 1);
165 pmp.drawLine(0, i, BACKGROUND_MAX_SIZE - 1, i);
170 // Set up new BG brush & zoom level (pixels per base unit)
171 Painter::zoom = gridPixels / gridSpacing;
172 UpdateGridBackground();
176 void DrawingView::UpdateGridBackground(void)
178 // Transform the origin to Qt coordinates
179 Vector pixmapOrigin = Painter::CartesianToQtCoords(Vector());
180 int x = (int)pixmapOrigin.x;
181 int y = (int)pixmapOrigin.y;
182 // Use mod arithmetic to grab the correct swatch of background
184 Negative numbers still screw it up... Need to think about what we're
185 trying to do here. The fact that it worked with 72 seems to have been pure luck.
186 It seems the problem is negative numbers: We can't let that happen.
187 When taking away the zero, it pops over 1 px at zero, then goes about 1/2 a
190 The bitmap looks like this:
200 @ x = 1, we want it to look like:
202 -+---+---+---+---+---
205 -+---+---+---+---+---
210 Which means we need to grab the sample from x = 3. @ x = -1:
220 Which means we need to grab the sample from x = 1. Which means we have to take
221 the mirror of the modulus of gridPixels.
223 Doing a mod of a negative number is problematic: 1st, the compiler converts the
224 negative number to an unsigned int, then it does the mod. Gets you wrong answers
225 most of the time, unless you use a power of 2. :-P So what we do here is just
226 take the modulus of the negation, which means we don't have to worry about
229 The positive case looks gruesome (and it is) but it boils down to this: We take
230 the modulus of the X coordinate, then mirror it by subtraction from the
231 maximum (in this case, gridPixels). This gives us a number in the range of 1 to
232 gridPixels. But we need the case where the result equalling gridPixels to be
233 zero; so we do another modulus operation on the result to achieve this.
238 x = (gridPixels - (x % gridPixels)) % gridPixels;
243 y = (gridPixels - (y % gridPixels)) % gridPixels;
245 // Here we grab a section of the bigger pixmap, so that the background
246 // *looks* like it's scrolling...
247 QPixmap pm = gridBackground.copy(x, y, gridPixels, gridPixels);
248 QPalette pal = palette();
249 pal.setBrush(backgroundRole(), QBrush(pm));
250 setAutoFillBackground(true);
255 void DrawingView::AddNewObjectToDocument(Object * object)
259 object->Reparent(&document);
260 document.Add(object);
263 //printf("DrawingView::AddNewObjectToDocument(). object=%08X\n", object);
267 QPoint DrawingView::GetAdjustedMousePosition(QMouseEvent * event)
269 // This is undoing the transform, e.g. going from client coords to local coords.
270 // In essence, the height - y is height + (y * -1), the (y * -1) term doing the
271 // conversion of the y-axis from increasing bottom to top.
272 return QPoint(offsetX + event->x(), offsetY + (size().height() - event->y()));
276 QPoint DrawingView::GetAdjustedClientPosition(int x, int y)
278 // VOODOO ALERT (ON Y COMPONENT!!!!) (eh?)
279 // No voodoo here, it's just grouped wrong to see it. It should be:
280 // -offsetY + (size.height() + (y * -1.0)) <-- this is wrong, offsetY should be positive
281 return QPoint(-offsetX + x, (size().height() - (-offsetY + y)) * +1.0);
286 // This looks strange, but it's really quite simple: We want a point that's
287 // more than half-way to the next grid point to snap there while conversely we
288 // want a point that's less than half-way to to the next grid point then snap
289 // to the one before it. So we add half of the grid spacing to the point, then
290 // divide by it so that we can remove the fractional part, then multiply it
291 // back to get back to the correct answer.
293 Vector DrawingView::SnapPointToGrid(Vector point)
295 point += gridSpacing / 2.0; // *This* adds to Z!!!
296 point /= gridSpacing;
297 point.x = floor(point.x);//need to fix this for negative numbers...
298 point.y = floor(point.y);
299 point.z = 0; // Make *sure* Z doesn't go anywhere!!!
300 point *= gridSpacing;
305 void DrawingView::paintEvent(QPaintEvent * /*event*/)
307 QPainter qtPainter(this);
308 Painter painter(&qtPainter);
311 qtPainter.setRenderHint(QPainter::Antialiasing);
313 // Painter::screenSize = Vector(size().width(), size().height());
314 Object::SetViewportHeight(size().height());
316 // Draw coordinate axes
318 painter.SetPen(QPen(Qt::blue, 1.0, Qt::DotLine));
319 painter.DrawLine(0, -16384, 0, 16384);
320 painter.DrawLine(-16384, 0, 16384, 0);
322 // Draw supplemental (tool related) points
323 // NOTE that this can be done as an action!
324 // In that case, we would need access to the document...
325 // [We can do that by making the document a class object...]
328 painter.SetPen(QPen(QColor(0, 200, 0), 2.0, Qt::SolidLine));
329 painter.DrawLine(rx - 10, ry, rx + 10, ry);
330 painter.DrawLine(rx, ry - 10, rx, ry + 10);
333 // Maybe we can make the grid into a background brush instead, and let Qt deal
336 // The top level document takes care of rendering for us...
337 document.Draw(&painter);
341 // painter.SetPen(QPen(Qt::green, 1.0, Qt::DashLine));
342 painter.SetPen(QPen(QColor(200, 100, 0, 255), 1.0, Qt::DashLine));
343 painter.DrawCrosshair(oldPoint);
344 toolAction->Draw(&painter);
347 if (Object::selectionInProgress)
349 // painter.SetPen(QPen(Qt::green, 1.0, Qt::SolidLine));
350 painter.SetPen(QPen(QColor(255, 127, 0, 255)));
351 // painter.SetBrush(QBrush(Qt::NoBrush));
352 painter.SetBrush(QBrush(QColor(255, 127, 0, 100)));
353 painter.DrawRect(Object::selection);
358 void DrawingView::resizeEvent(QResizeEvent * /*event*/)
360 Painter::screenSize = Vector(size().width(), size().height());
361 UpdateGridBackground();
365 void DrawingView::mousePressEvent(QMouseEvent * event)
367 if (event->button() == Qt::LeftButton)
369 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
371 // Problem with this: Can't select stuff very well with the snap grid on.
372 // Completely screws things up, as sometimes things don't fall on the grid.
374 So, how to fix this? Have the Object check itself?
375 Maybe we can fix this by having the initial point not be snapped, but when there's
376 a drag, we substitute the snapped point 'oldPoint' which the Object keeps track of
377 internally to know how far it was dragged...
379 if (Object::snapToGrid)
380 point = SnapPointToGrid(point);
382 collided = document.Collided(point);
385 update(); // Do an update if collided with at least *one* object in the document
388 toolAction->MouseDown(point);
390 // Didn't hit any object and not using a tool, so do a selection rectangle
391 if (!(collided || toolAction))
393 Object::selectionInProgress = true;
394 Object::selection.setTopLeft(QPointF(point.x, point.y));
395 Object::selection.setBottomRight(QPointF(point.x, point.y));
398 else if (event->button() == Qt::MiddleButton)
401 oldPoint = Vector(event->x(), event->y());
402 // Should also change the mouse pointer as well...
403 setCursor(Qt::SizeAllCursor);
408 void DrawingView::mouseMoveEvent(QMouseEvent * event)
410 Vector point = Painter::QtToCartesianCoords(Vector(event->x(), event->y()));
411 Object::selection.setBottomRight(QPointF(point.x, point.y));
413 if (event->buttons() & Qt::MiddleButton)
415 point = Vector(event->x(), event->y());
416 // Since we're using Qt coords for scrolling, we have to adjust them here to
417 // conform to Cartesian coords, since the origin is using Cartesian. :-)
418 Vector delta(point, oldPoint);
419 delta /= Painter::zoom;
421 Painter::origin -= delta;
423 UpdateGridBackground();
429 // Grid processing...
431 if ((event->buttons() & Qt::LeftButton) && Object::snapToGrid)
434 point += gridSpacing / 2.0; // *This* adds to Z!!!
435 point /= gridSpacing;
436 //200% is ok, gridSpacing = 6 in this case...
437 //won't run into problems until gridSpacing = 1.5 (zoom = 800%)
438 //run into problems with this approach: when zoom level is 200% this truncates to
439 //integers, which is *not* what's wanted here...
440 point.x = floor(point.x);//need to fix this for negative numbers...
441 point.y = floor(point.y);
442 point.z = 0; // Make *sure* Z doesn't go anywhere!!!
443 point *= gridSpacing;
445 point = SnapPointToGrid(point);
450 //we should keep track of the last point here and only pass this down *if* the point
452 document.PointerMoved(point);
454 if (document.NeedsUpdate() || Object::selectionInProgress)
459 if (Object::snapToGrid)
461 point = SnapPointToGrid(point);
465 toolAction->MouseMoved(point);
471 void DrawingView::mouseReleaseEvent(QMouseEvent * event)
473 if (event->button() == Qt::LeftButton)
475 document.PointerReleased();
477 //We need to update especially if nothing collided and the state needs to change. !!! FIX !!!
478 //could set it up to use the document's update function (assumes that all object updates
479 //are being reported correctly:
480 // if (document.NeedsUpdate())
482 update(); // Do an update if collided with at least *one* object in the document
485 toolAction->MouseReleased();
487 if (Object::selectionInProgress)
489 // Select all the stuff inside of selection
490 Object::selectionInProgress = false;
493 else if (event->button() == Qt::MiddleButton)
496 setCursor(Qt::ArrowCursor);