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50
51#include "basictoolsplugin.h"
52
53#include <QInputDialog>
54#include <QPainter>
55#include <QRandomGenerator>
56#include <QtMath>
57
58//! [0]
59QStringList BasicToolsPlugin::brushes() const
60{
61 return {tr("Pencil"), tr("Air Brush"), tr("Random Letters")};
62}
63//! [0]
64
65//! [1]
66QRect BasicToolsPlugin::mousePress(const QString &brush, QPainter &painter,
67 const QPoint &pos)
68{
69 return mouseMove(brush, painter, pos, pos);
70}
71//! [1]
72
73//! [2]
74QRect BasicToolsPlugin::mouseMove(const QString &brush, QPainter &painter,
75 const QPoint &oldPos, const QPoint &newPos)
76{
77 painter.save();
78
79 int rad = painter.pen().width() / 2;
80 QRect boundingRect = QRect(oldPos, newPos).normalized()
81 .adjusted(-rad, -rad, +rad, +rad);
82 QColor color = painter.pen().color();
83 int thickness = painter.pen().width();
84 QColor transparentColor(color.red(), color.green(), color.blue(), 0);
85//! [2] //! [3]
86
87 if (brush == tr("Pencil")) {
88 painter.drawLine(oldPos, newPos);
89 } else if (brush == tr("Air Brush")) {
90 int numSteps = 2 + (newPos - oldPos).manhattanLength() / 2;
91
92 painter.setBrush(QBrush(color, Qt::Dense6Pattern));
93 painter.setPen(Qt::NoPen);
94
95 for (int i = 0; i < numSteps; ++i) {
96 int x = oldPos.x() + i * (newPos.x() - oldPos.x()) / (numSteps - 1);
97 int y = oldPos.y() + i * (newPos.y() - oldPos.y()) / (numSteps - 1);
98
99 painter.drawEllipse(x - (thickness / 2), y - (thickness / 2),
100 thickness, thickness);
101 }
102 } else if (brush == tr("Random Letters")) {
103 QChar ch(QRandomGenerator::global()->bounded('A', 'Z' + 1));
104
105 QFont biggerFont = painter.font();
106 biggerFont.setBold(true);
107 biggerFont.setPointSize(biggerFont.pointSize() + thickness);
108 painter.setFont(biggerFont);
109
110 painter.drawText(newPos, QString(ch));
111
112 QFontMetrics metrics(painter.font());
113 boundingRect = metrics.boundingRect(ch);
114 boundingRect.translate(newPos);
115 boundingRect.adjust(-10, -10, +10, +10);
116 }
117 painter.restore();
118 return boundingRect;
119}
120//! [3]
121
122//! [4]
123QRect BasicToolsPlugin::mouseRelease(const QString & /* brush */,
124 QPainter & /* painter */,
125 const QPoint & /* pos */)
126{
127 return QRect(0, 0, 0, 0);
128}
129//! [4]
130
131//! [5]
132QStringList BasicToolsPlugin::shapes() const
133{
134 return {tr("Circle"), tr("Star"), tr("Text...")};
135}
136//! [5]
137
138//! [6]
139QPainterPath BasicToolsPlugin::generateShape(const QString &shape,
140 QWidget *parent)
141{
142 QPainterPath path;
143
144 if (shape == tr("Circle")) {
145 path.addEllipse(0, 0, 50, 50);
146 } else if (shape == tr("Star")) {
147 path.moveTo(90, 50);
148 for (int i = 1; i < 5; ++i) {
149 path.lineTo(50 + 40 * std::cos(0.8 * i * M_PI),
150 50 + 40 * std::sin(0.8 * i * M_PI));
151 }
152 path.closeSubpath();
153 } else if (shape == tr("Text...")) {
154 QString text = QInputDialog::getText(parent, tr("Text Shape"),
155 tr("Enter text:"),
156 QLineEdit::Normal, tr("Qt"));
157 if (!text.isEmpty()) {
158 QFont timesFont("Times", 50);
159 timesFont.setStyleStrategy(QFont::ForceOutline);
160 path.addText(0, 0, timesFont, text);
161 }
162 }
163
164 return path;
165}
166//! [6]
167
168//! [7]
169QStringList BasicToolsPlugin::filters() const
170{
171 return {tr("Invert Pixels"), tr("Swap RGB"), tr("Grayscale")};
172}
173//! [7]
174
175//! [8]
176QImage BasicToolsPlugin::filterImage(const QString &filter, const QImage &image,
177 QWidget * /* parent */)
178{
179 QImage result = image.convertToFormat(QImage::Format_RGB32);
180
181 if (filter == tr("Invert Pixels")) {
182 result.invertPixels();
183 } else if (filter == tr("Swap RGB")) {
184 result = result.rgbSwapped();
185 } else if (filter == tr("Grayscale")) {
186 for (int y = 0; y < result.height(); ++y) {
187 for (int x = 0; x < result.width(); ++x) {
188 QRgb pixel = result.pixel(x, y);
189 int gray = qGray(pixel);
190 int alpha = qAlpha(pixel);
191 result.setPixel(x, y, qRgba(gray, gray, gray, alpha));
192 }
193 }
194 }
195 return result;
196}
197//! [8]
198