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"
20 // Set class variable defaults
21 Vector Painter::origin(-10.0, -10.0);
22 double Painter::zoom = 1.0;
23 Vector Painter::screenSize(200.0, 200.0);
26 Painter::Painter(QPainter * p/*= NULL*/): painter(p)
36 Vector Painter::CartesianToQtCoords(Vector v)
38 // Convert regular Cartesian coordinates to the inverted Y-axis Qt coordinates
39 // at the current origin and zoom level.
40 return Vector((v.x - origin.x) * zoom, screenSize.y - ((v.y - origin.y) * zoom));
44 Vector Painter::QtToCartesianCoords(Vector v)
46 // Convert screen location, with inverted Y-axis coordinates, to regular
47 // Cartesian coordinates at the current zoom level.
48 return Vector((v.x / zoom) + origin.x, ((screenSize.y - v.y) / zoom) + origin.y);
52 e.g., we have a point on the screen at Qt coords of 10, 10, screenSize is 100, 100.
53 origin is -10, -10 and zoom level is 2 (200%)
55 1st, invert the Y: 10, 10 -> 10, 90
56 2nd, add origin: 10, 90 -> 0, 80 (no, not right--err, yes, it is)
57 3rd, aply zoom: 0, 80 -> 0, 40
61 1st, invert the Y: 10, 10 -> 10, 90
62 2nd, aply zoom: 10, 90 -> 5, 45
63 3rd, add origin: 5, 45 -> -5, 35
65 it depends on whether or not origin is in Qt coords or cartesian. If Qt, then the 1st
66 is correct, otherwise, the 2nd is correct.
68 The way we calculate the Cartesian to Qt shows the 2nd (origin is cartesian) to be correct.
73 void Painter::SetRenderHint(int hint)
78 painter->setRenderHint((QPainter::RenderHint)hint);
82 void Painter::SetBrush(QBrush brush)
87 painter->setBrush(brush);
91 void Painter::SetFont(QFont font)
96 painter->setFont(font);
100 void Painter::SetPen(QPen pen)
105 painter->setPen(pen);
109 void Painter::DrawAngledText(Vector center, double angle, QString text, double size)
114 // Strategy: Since Qt doesn't have any rotated text drawing functions,
115 // we instead translate the origin to the center of the text to be drawn and
116 // then rotate the frame to the desired angle.
117 center = CartesianToQtCoords(center);
119 // We may need this stuff... If dimension text is large enough.
120 // int textWidth = QFontMetrics(painter->font()).width(text);
121 // int textHeight = QFontMetrics(painter->font()).height();
122 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
124 // This is in pixels. Might not render correctly at all zoom levels.
125 // Need to figure out if dimensions are always rendered at one size
126 // regardless of zoom, or if they have a definite size, and are thus
128 float yOffset = -12.0 * zoom * size;
130 // Fix text so it isn't upside down...
131 if ((angle > PI * 0.5) && (angle < PI * 1.5))
134 yOffset = 12.0 * zoom * size;
137 textBox.translate(0, yOffset);
139 painter->translate(center.x, center.y);
140 // Angles are backwards in the Qt coord system, so we flip ours...
141 painter->rotate(-angle * RADIANS_TO_DEGREES);
142 //Need to fix this so the text scales as well...
143 painter->drawText(textBox, Qt::AlignCenter, text);
148 void Painter::DrawArc(Vector center, double radius, double startAngle, double span)
150 center = CartesianToQtCoords(center);
151 // Need to multiply scalar quantities by the zoom factor as well...
153 QRectF rectangle(QPointF(center.x - radius, center.y - radius),
154 QPointF(center.x + radius, center.y + radius));
155 int angle1 = (int)(startAngle * RADIANS_TO_DEGREES * 16.0);
156 int angle2 = (int)(span * RADIANS_TO_DEGREES * 16.0);
157 painter->drawArc(rectangle, angle1, angle2);
161 void Painter::DrawEllipse(Vector center, double axis1, double axis2)
163 // Need to multiply scalar quantities by the zoom factor as well...
164 center = CartesianToQtCoords(center);
165 painter->drawEllipse(QPointF(center.x, center.y), axis1 * zoom, axis2 * zoom);
169 // This function is for drawing object handles without regard for zoom level;
170 // we don't want our object handle size to depend on the zoom level!
171 void Painter::DrawHandle(Vector center)
173 center = CartesianToQtCoords(center);
174 painter->setBrush(Qt::NoBrush);
175 painter->drawEllipse(QPointF(center.x, center.y), 4.0, 4.0);
179 void Painter::DrawLine(int x1, int y1, int x2, int y2)
184 Vector v1 = CartesianToQtCoords(Vector(x1, y1));
185 Vector v2 = CartesianToQtCoords(Vector(x2, y2));
186 painter->drawLine(v1.x, v1.y, v2.x, v2.y);
190 void Painter::DrawLine(Vector v1, Vector v2)
195 v1 = CartesianToQtCoords(v1);
196 v2 = CartesianToQtCoords(v2);
197 painter->drawLine(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
201 void Painter::DrawPoint(int x, int y)
206 Vector v = CartesianToQtCoords(Vector(x, y));
207 painter->drawPoint(v.x, v.y);
211 void Painter::DrawRoundedRect(QRectF rect, double radiusX, double radiusY)
216 painter->drawRoundedRect(rect, radiusX, radiusY);
220 void Painter::DrawRect(QRectF rect)
225 Vector v1 = CartesianToQtCoords(Vector(rect.x(), rect.y()));
226 Vector v2 = CartesianToQtCoords(Vector(rect.right(), rect.bottom()));
227 QRectF screenRect(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
228 painter->drawRect(screenRect);
232 void Painter::DrawText(QRectF rect, int type, QString text)
237 painter->drawText(rect, (Qt::AlignmentFlag)type, text);
241 void Painter::DrawArrowhead(Vector head, Vector tail, double size)
245 // We draw the arrowhead aligned along the line from tail to head
246 double angle = Vector(head - tail).Angle();
247 double orthoAngle = angle + (PI / 2.0);
248 Vector orthogonal = Vector(cos(orthoAngle), sin(orthoAngle));
249 Vector unit = Vector(head - tail).Unit();
251 Point p1 = head - (unit * 9.0 * size);
252 Point p2 = p1 + (orthogonal * 3.0 * size);
253 Point p3 = p1 - (orthogonal * 3.0 * size);
255 Point p4 = CartesianToQtCoords(head);
256 Point p5 = CartesianToQtCoords(p2);
257 Point p6 = CartesianToQtCoords(p3);
259 arrow << QPointF(p4.x, p4.y) << QPointF(p5.x, p5.y) << QPointF(p6.x, p6.y);
261 painter->drawPolygon(arrow);