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 L. 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)
34 Vector Painter::CartesianToQtCoords(Vector v)
36 // Convert regular Cartesian coordinates to the inverted Y-axis Qt coordinates
37 // at the current origin and zoom level.
38 return Vector((v.x - origin.x) * zoom, screenSize.y - ((v.y - origin.y) * zoom));
41 Vector Painter::QtToCartesianCoords(Vector v)
43 // Convert screen location, with inverted Y-axis coordinates, to regular
44 // Cartesian coordinates at the current zoom level.
45 return Vector((v.x / zoom) + origin.x, ((screenSize.y - v.y) / zoom) + origin.y);
49 e.g., we have a point on the screen at Qt coords of 10, 10, screenSize is 100, 100.
50 origin is -10, -10 and zoom level is 2 (200%)
52 1st, invert the Y: 10, 10 -> 10, 90
53 2nd, add origin: 10, 90 -> 0, 80 (no, not right--err, yes, it is)
54 3rd, aply zoom: 0, 80 -> 0, 40
58 1st, invert the Y: 10, 10 -> 10, 90
59 2nd, aply zoom: 10, 90 -> 5, 45
60 3rd, add origin: 5, 45 -> -5, 35
62 it depends on whether or not origin is in Qt coords or cartesian. If Qt, then the 1st
63 is correct, otherwise, the 2nd is correct.
65 The way we calculate the Cartesian to Qt shows the 2nd (origin is cartesian) to be correct.
69 void Painter::SetRenderHint(int hint)
74 painter->setRenderHint((QPainter::RenderHint)hint);
77 void Painter::SetBrush(QBrush brush)
82 painter->setBrush(brush);
85 void Painter::SetFont(QFont font)
90 painter->setFont(font);
93 void Painter::SetPen(QPen pen)
101 void Painter::DrawAngledText(Vector center, double angle, QString text)
103 // Strategy: Since Qt doesn't have any rotated text drawing functions,
104 // we instead translate the origin to the center of the text to be drawn and
105 // then rotate the frame to the desired angle.
106 center = CartesianToQtCoords(center);
108 // We may need this stuff... If dimension text is large enough.
109 // int textWidth = QFontMetrics(painter->font()).width(text);
110 // int textHeight = QFontMetrics(painter->font()).height();
111 QRectF textBox(-100, -100, 200, 200); // x, y, w, h; x/y = upper left corner
113 // This is in pixels. Might not render correctly at all zoom levels.
114 // Need to figure out if dimensions are always rendered at one size regardless of zoom,
115 // or if they have a definite size, and are thus zoomable.
116 // If zoomable, this is incorrect:
119 // Fix text so it isn't upside down...
120 if ((angle > PI * 0.5) && (angle < PI * 1.5))
126 textBox.translate(0, yOffset);
128 painter->translate(center.x, center.y);
129 // Angles are backwards in the Qt coord system, so we flip ours...
130 painter->rotate(-angle * RADIANS_TO_DEGREES);
131 painter->drawText(textBox, Qt::AlignCenter, text);
135 void Painter::DrawArc(Vector center, double radius, double startAngle, double span)
137 center = CartesianToQtCoords(center);
138 QRectF rectangle(QPointF(center.x - radius, center.y - radius),
139 QPointF(center.x + radius, center.y + radius));
140 int angle1 = (int)(startAngle * RADIANS_TO_DEGREES * 16.0);
141 int angle2 = (int)(span * RADIANS_TO_DEGREES * 16.0);
142 painter->drawArc(rectangle, angle1, angle2);
145 void Painter::DrawEllipse(Vector center, double axis1, double axis2)
147 center = CartesianToQtCoords(center);
148 painter->drawEllipse(QPointF(center.x, center.y), axis1, axis2);
151 void Painter::DrawLine(int x1, int y1, int x2, int y2)
156 Vector v1 = CartesianToQtCoords(Vector(x1, y1));
157 Vector v2 = CartesianToQtCoords(Vector(x2, y2));
158 painter->drawLine(v1.x, v1.y, v2.x, v2.y);
161 void Painter::DrawLine(Vector v1, Vector v2)
166 v1 = CartesianToQtCoords(v1);
167 v2 = CartesianToQtCoords(v2);
168 painter->drawLine(QPointF(v1.x, v1.y), QPointF(v2.x, v2.y));
171 void Painter::DrawPoint(int x, int y)
176 Vector v = CartesianToQtCoords(Vector(x, y));
177 painter->drawPoint(v.x, v.y);
180 void Painter::DrawRoundedRect(QRectF rect, double radiusX, double radiusY)
185 painter->drawRoundedRect(rect, radiusX, radiusY);
188 void Painter::DrawText(QRectF rect, int type, QString text)
193 painter->drawText(rect, (Qt::AlignmentFlag)type, text);