2 // painter.cpp: Paint abstraction layer between Archtektonas and Qt
4 // Part of the Architektonas Project
5 // (C) 2011 Underground Software
6 // See the README and GPLv3 files for licensing and warranty information
8 // JLH = James Hammons <jlhamm@acm.org>
11 // --- ---------- ------------------------------------------------------------
12 // JLH 09/20/2011 Created this file
17 #include "mathconstants.h"
21 // Set class variable defaults
22 Vector Painter::origin(-10.0, -10.0);
23 double Painter::zoom = 1.0;
24 Vector Painter::screenSize(200.0, 200.0);
27 Painter::Painter(QPainter * p/*= NULL*/): painter(p)
37 Vector Painter::CartesianToQtCoords(Vector v)
39 // Convert regular Cartesian coordinates to the inverted Y-axis Qt coordinates
40 // at the current origin and zoom level.
41 return Vector((v.x - origin.x) * zoom, screenSize.y - ((v.y - origin.y) * zoom));
45 Vector Painter::QtToCartesianCoords(Vector v)
47 // Convert screen location, with inverted Y-axis coordinates, to regular
48 // Cartesian coordinates at the current zoom level.
49 return Vector((v.x / zoom) + origin.x, ((screenSize.y - v.y) / zoom) + origin.y);
53 e.g., we have a point on the screen at Qt coords of 10, 10, screenSize is 100, 100.
54 origin is -10, -10 and zoom level is 2 (200%)
56 1st, invert the Y: 10, 10 -> 10, 90
57 2nd, add origin: 10, 90 -> 0, 80 (no, not right--err, yes, it is)
58 3rd, aply zoom: 0, 80 -> 0, 40
62 1st, invert the Y: 10, 10 -> 10, 90
63 2nd, aply zoom: 10, 90 -> 5, 45
64 3rd, add origin: 5, 45 -> -5, 35
66 it depends on whether or not origin is in Qt coords or cartesian. If Qt, then the 1st
67 is correct, otherwise, the 2nd is correct.
69 The way we calculate the Cartesian to Qt shows the 2nd (origin is cartesian) to be correct.
74 void Painter::SetRenderHint(int hint)
79 painter->setRenderHint((QPainter::RenderHint)hint);
83 void Painter::SetBrush(QBrush brush)
88 painter->setBrush(brush);
92 void Painter::SetFont(QFont font)
97 painter->setFont(font);
101 void Painter::SetPen(QPen pen)
106 painter->setPen(pen);
110 void Painter::DrawAngledText(Vector center, double angle, QString text, double size)
115 // Strategy: Since Qt doesn't have any rotated text drawing functions,
116 // we instead translate the origin to the center of the text to be drawn and
117 // then rotate the frame to the desired angle.
118 center = CartesianToQtCoords(center);
120 // We may need this stuff... If dimension text is large enough.
121 // int textWidth = QFontMetrics(painter->font()).width(text);
122 // int textHeight = QFontMetrics(painter->font()).height();
123 QRectF textBox(-100.0 * zoom * size, -100.0 * zoom * size, 200.0 * zoom * size, 200.0 * zoom * size); // x, y, w, h; x/y = upper left corner
125 // This is in pixels. Might not render correctly at all zoom levels.
126 // Need to figure out if dimensions are always rendered at one size
127 // regardless of zoom, or if they have a definite size, and are thus
129 float yOffset = -12.0 * zoom * size;
131 // Fix text so it isn't upside down...
132 if ((angle > PI * 0.5) && (angle < PI * 1.5))
135 yOffset = 12.0 * zoom * size;
138 textBox.translate(0, yOffset);
140 painter->translate(center.x, center.y);
141 // Angles are backwards in the Qt coord system, so we flip ours...
142 painter->rotate(-angle * RADIANS_TO_DEGREES);
143 //Need to fix this so the text scales as well...
144 painter->drawText(textBox, Qt::AlignCenter, text);
149 void Painter::DrawArc(Vector center, double radius, double startAngle, double span)
151 center = CartesianToQtCoords(center);
152 // Need to multiply scalar quantities by the zoom factor as well...
154 QRectF rectangle(QPointF(center.x - radius, center.y - radius),
155 QPointF(center.x + radius, center.y + radius));
156 int angle1 = (int)(startAngle * RADIANS_TO_DEGREES * 16.0);
157 int angle2 = (int)(span * RADIANS_TO_DEGREES * 16.0);
158 painter->drawArc(rectangle, angle1, angle2);
162 void Painter::DrawEllipse(Vector center, double axis1, double axis2)
164 // Need to multiply scalar quantities by the zoom factor as well...
165 center = CartesianToQtCoords(center);
166 painter->drawEllipse(QPointF(center.x, center.y), axis1 * zoom, axis2 * zoom);
170 // This function is for drawing object handles without regard for zoom level;
171 // we don't want our object handle size to depend on the zoom level!
172 void Painter::DrawHandle(Vector center)
174 center = CartesianToQtCoords(center);
175 painter->setBrush(Qt::NoBrush);
176 painter->drawEllipse(QPointF(center.x, center.y), 4.0, 4.0);
180 // This function is for drawing object handles without regard for zoom level;
181 // we don't want our object handle size to depend on the zoom level!
182 void Painter::DrawArrowHandle(Vector center, double angle)
184 center = CartesianToQtCoords(center);
187 // Since we're drawing directly on the screen, the Y is inverted. So we use
188 // the mirror of the angle.
189 double orthoAngle = -angle + (PI / 2.0);
190 Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
191 Vector unit = Vector(cos(-angle), sin(-angle));
193 Point p0 = center + (unit * 6.0);
194 Point p1 = center + (unit * 21.0);
195 Point p1b = center + (unit * 11.0);
196 Point p2 = p1b + (orthogonal * 5.0);
197 Point p3 = p1b - (orthogonal * 5.0);
199 painter->drawLine(p0.x, p0.y, p1.x, p1.y);
200 arrow << QPointF(p1.x, p1.y) << QPointF(p2.x, p2.y) << QPointF(p3.x, p3.y);
202 painter->drawPolygon(arrow);
206 void Painter::DrawLine(int x1, int y1, int x2, int y2)
211 Vector v1 = CartesianToQtCoords(Vector(x1, y1));
212 Vector v2 = CartesianToQtCoords(Vector(x2, y2));
213 painter->drawLine(v1.x, v1.y, v2.x, v2.y);
217 void Painter::DrawLine(Vector v1, Vector v2)
222 v1 = CartesianToQtCoords(v1);
223 v2 = CartesianToQtCoords(v2);
224 painter->drawLine(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
228 void Painter::DrawPoint(int x, int y)
233 Vector v = CartesianToQtCoords(Vector(x, y));
234 painter->drawPoint(v.x, v.y);
238 // The rect passed in is in Qt coordinates...
239 void Painter::DrawRoundedRect(QRectF rect, double radiusX, double radiusY)
244 painter->drawRoundedRect(rect, radiusX, radiusY);
248 // The rect passed in is in Cartesian but we want to pad it by a set number of
249 // pixels (currently set at 8), so the pad looks the same regardless of zoom.
250 void Painter::DrawPaddedRect(QRectF rect)
255 Vector v1 = CartesianToQtCoords(Vector(rect.x(), rect.y()));
256 Vector v2 = CartesianToQtCoords(Vector(rect.right(), rect.bottom()));
257 QRectF screenRect(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
258 screenRect.adjust(-8, 8, 8, -8); // Left/top, right/bottom
259 painter->drawRect(screenRect);
263 void Painter::DrawRect(QRectF rect)
268 Vector v1 = CartesianToQtCoords(Vector(rect.x(), rect.y()));
269 Vector v2 = CartesianToQtCoords(Vector(rect.right(), rect.bottom()));
270 QRectF screenRect(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
271 painter->drawRect(screenRect);
275 void Painter::DrawText(QRectF rect, int type, QString text)
280 painter->drawText(rect, (Qt::AlignmentFlag)type, text);
284 void Painter::DrawArrowhead(Vector head, Vector tail, double size)
291 // We draw the arrowhead aligned along the line from tail to head
292 double angle = Vector(head - tail).Angle();
293 double orthoAngle = angle + (PI / 2.0);
294 Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
295 Vector unit = Vector(head - tail).Unit();
297 Point p1 = head - (unit * 9.0 * size);
298 Point p2 = p1 + (orthogonal * 3.0 * size);
299 Point p3 = p1 - (orthogonal * 3.0 * size);
301 Point p4 = CartesianToQtCoords(head);
302 Point p5 = CartesianToQtCoords(p2);
303 Point p6 = CartesianToQtCoords(p3);
305 arrow << QPointF(p4.x, p4.y) << QPointF(p5.x, p5.y) << QPointF(p6.x, p6.y);
307 painter->drawPolygon(arrow);
311 // Point is given in Cartesian coordinates
312 void Painter::DrawCrosshair(Vector point)
317 Vector screenPoint = CartesianToQtCoords(point);
318 painter->drawLine(0, screenPoint.y, screenSize.x, screenPoint.y);
319 painter->drawLine(screenPoint.x, 0, screenPoint.x, screenSize.y);
323 void Painter::DrawInformativeText(QString text)
325 painter->setFont(*Object::font);
326 QRectF bounds = painter->boundingRect(QRectF(), Qt::AlignVCenter, text);
327 bounds.moveTo(17.0, 17.0);
328 QRectF textRect = bounds;
329 textRect.adjust(-7.0, -7.0, 7.0, 7.0);
331 QPen pen = QPen(QColor(0x00, 0xFF, 0x00), 1.0, Qt::SolidLine);
332 painter->setPen(pen);
333 painter->setBrush(QBrush(QColor(0x40, 0xFF, 0x40, 0x9F)));
334 painter->drawRoundedRect(textRect, 7.0, 7.0);
336 pen = QPen(QColor(0x00, 0x5F, 0xDF));
337 painter->setPen(pen);
338 painter->drawText(bounds, Qt::AlignVCenter, text);