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 void Painter::DrawLine(int x1, int y1, int x2, int y2)
185 Vector v1 = CartesianToQtCoords(Vector(x1, y1));
186 Vector v2 = CartesianToQtCoords(Vector(x2, y2));
187 painter->drawLine(v1.x, v1.y, v2.x, v2.y);
191 void Painter::DrawLine(Vector v1, Vector v2)
196 v1 = CartesianToQtCoords(v1);
197 v2 = CartesianToQtCoords(v2);
198 painter->drawLine(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
202 void Painter::DrawPoint(int x, int y)
207 Vector v = CartesianToQtCoords(Vector(x, y));
208 painter->drawPoint(v.x, v.y);
212 // The rect passed in is in Qt coordinates...
213 void Painter::DrawRoundedRect(QRectF rect, double radiusX, double radiusY)
218 painter->drawRoundedRect(rect, radiusX, radiusY);
222 // The rect passed in is in Cartesian but we want to pad it by a set number of
223 // pixels (currently set at 8), so the pad looks the same regardless of zoom.
224 void Painter::DrawPaddedRect(QRectF rect)
229 Vector v1 = CartesianToQtCoords(Vector(rect.x(), rect.y()));
230 Vector v2 = CartesianToQtCoords(Vector(rect.right(), rect.bottom()));
231 QRectF screenRect(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
232 screenRect.adjust(-8, 8, 8, -8); // Left/top, right/bottom
233 painter->drawRect(screenRect);
237 void Painter::DrawRect(QRectF rect)
242 Vector v1 = CartesianToQtCoords(Vector(rect.x(), rect.y()));
243 Vector v2 = CartesianToQtCoords(Vector(rect.right(), rect.bottom()));
244 QRectF screenRect(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
245 painter->drawRect(screenRect);
249 void Painter::DrawText(QRectF rect, int type, QString text)
254 painter->drawText(rect, (Qt::AlignmentFlag)type, text);
258 void Painter::DrawArrowhead(Vector head, Vector tail, double size)
265 // We draw the arrowhead aligned along the line from tail to head
266 double angle = Vector(head - tail).Angle();
267 double orthoAngle = angle + (PI / 2.0);
268 Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
269 Vector unit = Vector(head - tail).Unit();
271 Point p1 = head - (unit * 9.0 * size);
272 Point p2 = p1 + (orthogonal * 3.0 * size);
273 Point p3 = p1 - (orthogonal * 3.0 * size);
275 Point p4 = CartesianToQtCoords(head);
276 Point p5 = CartesianToQtCoords(p2);
277 Point p6 = CartesianToQtCoords(p3);
279 arrow << QPointF(p4.x, p4.y) << QPointF(p5.x, p5.y) << QPointF(p6.x, p6.y);
281 painter->drawPolygon(arrow);
285 // Point is given in Cartesian coordinates
286 void Painter::DrawCrosshair(Vector point)
291 Vector screenPoint = CartesianToQtCoords(point);
292 painter->drawLine(0, screenPoint.y, screenSize.x, screenPoint.y);
293 painter->drawLine(screenPoint.x, 0, screenPoint.x, screenSize.y);
297 void Painter::DrawInformativeText(QString text)
299 painter->setFont(*Object::font);
300 QRectF bounds = painter->boundingRect(QRectF(), Qt::AlignVCenter, text);
301 bounds.moveTo(17.0, 17.0);
302 QRectF textRect = bounds;
303 textRect.adjust(-7.0, -7.0, 7.0, 7.0);
305 QPen pen = QPen(QColor(0x00, 0xFF, 0x00), 1.0, Qt::SolidLine);
306 painter->setPen(pen);
307 painter->setBrush(QBrush(QColor(0x40, 0xFF, 0x40, 0x9F)));
308 painter->drawRoundedRect(textRect, 7.0, 7.0);
310 pen = QPen(QColor(0x00, 0x5F, 0xDF));
311 painter->setPen(pen);
312 painter->drawText(bounds, Qt::AlignVCenter, text);