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50
51#include "window.h"
52
53Window::Window(QWidget *parent)
54 : QWidget(parent),
55 m_iconSize(64, 64)
56{
57 m_ui.setupUi(this);
58 m_ui.easingCurvePicker->setIconSize(m_iconSize);
59 m_ui.easingCurvePicker->setMinimumHeight(m_iconSize.height() + 50);
60 m_ui.buttonGroup->setId(button: m_ui.lineRadio, id: 0);
61 m_ui.buttonGroup->setId(button: m_ui.circleRadio, id: 1);
62
63 QEasingCurve dummy;
64 m_ui.periodSpinBox->setValue(dummy.period());
65 m_ui.amplitudeSpinBox->setValue(dummy.amplitude());
66 m_ui.overshootSpinBox->setValue(dummy.overshoot());
67
68 connect(sender: m_ui.easingCurvePicker, signal: &QListWidget::currentRowChanged,
69 receiver: this, slot: &Window::curveChanged);
70 connect(sender: m_ui.buttonGroup, signal: QOverload<QAbstractButton *>::of(ptr: &QButtonGroup::buttonClicked),
71 receiver: this, slot: &Window::pathChanged);
72 connect(sender: m_ui.periodSpinBox, signal: QOverload<double>::of(ptr: &QDoubleSpinBox::valueChanged),
73 receiver: this, slot: &Window::periodChanged);
74 connect(sender: m_ui.amplitudeSpinBox, signal: QOverload<double>::of(ptr: &QDoubleSpinBox::valueChanged),
75 receiver: this, slot: &Window::amplitudeChanged);
76 connect(sender: m_ui.overshootSpinBox, signal: QOverload<double>::of(ptr: &QDoubleSpinBox::valueChanged),
77 receiver: this, slot: &Window::overshootChanged);
78 createCurveIcons();
79
80 QPixmap pix(QLatin1String(":/images/qt-logo.png"));
81 m_item = new PixmapItem(pix);
82 m_scene.addItem(item: m_item);
83 m_ui.graphicsView->setScene(&m_scene);
84
85 m_anim = new Animation(m_item, "pos");
86 m_anim->setEasingCurve(QEasingCurve::OutBounce);
87 m_ui.easingCurvePicker->setCurrentRow(int(QEasingCurve::OutBounce));
88
89 startAnimation();
90}
91
92QEasingCurve createEasingCurve(QEasingCurve::Type curveType)
93{
94 QEasingCurve curve(curveType);
95
96 if (curveType == QEasingCurve::BezierSpline) {
97 curve.addCubicBezierSegment(c1: QPointF(0.4, 0.1), c2: QPointF(0.6, 0.9), endPoint: QPointF(1.0, 1.0));
98
99 } else if (curveType == QEasingCurve::TCBSpline) {
100 curve.addTCBSegment(nextPoint: QPointF(0.0, 0.0), t: 0, c: 0, b: 0);
101 curve.addTCBSegment(nextPoint: QPointF(0.3, 0.4), t: 0.2, c: 1, b: -0.2);
102 curve.addTCBSegment(nextPoint: QPointF(0.7, 0.6), t: -0.2, c: 1, b: 0.2);
103 curve.addTCBSegment(nextPoint: QPointF(1.0, 1.0), t: 0, c: 0, b: 0);
104 }
105
106 return curve;
107}
108
109void Window::createCurveIcons()
110{
111 QPixmap pix(m_iconSize);
112 QPainter painter(&pix);
113 QLinearGradient gradient(0,0, 0, m_iconSize.height());
114 gradient.setColorAt(pos: 0.0, color: QColor(240, 240, 240));
115 gradient.setColorAt(pos: 1.0, color: QColor(224, 224, 224));
116 QBrush brush(gradient);
117 const QMetaObject &mo = QEasingCurve::staticMetaObject;
118 QMetaEnum metaEnum = mo.enumerator(index: mo.indexOfEnumerator(name: "Type"));
119 // Skip QEasingCurve::Custom
120 for (int i = 0; i < QEasingCurve::NCurveTypes - 1; ++i) {
121 painter.fillRect(QRect(QPoint(0, 0), m_iconSize), brush);
122 QEasingCurve curve = createEasingCurve(curveType: (QEasingCurve::Type) i);
123 painter.setPen(QColor(0, 0, 255, 64));
124 qreal xAxis = m_iconSize.height()/1.5;
125 qreal yAxis = m_iconSize.width()/3;
126 painter.drawLine(x1: 0, y1: xAxis, x2: m_iconSize.width(), y2: xAxis);
127 painter.drawLine(x1: yAxis, y1: 0, x2: yAxis, y2: m_iconSize.height());
128
129 qreal curveScale = m_iconSize.height()/2;
130
131 painter.setPen(Qt::NoPen);
132
133 // start point
134 painter.setBrush(Qt::red);
135 QPoint start(yAxis, xAxis - curveScale * curve.valueForProgress(progress: 0));
136 painter.drawRect(x: start.x() - 1, y: start.y() - 1, w: 3, h: 3);
137
138 // end point
139 painter.setBrush(Qt::blue);
140 QPoint end(yAxis + curveScale, xAxis - curveScale * curve.valueForProgress(progress: 1));
141 painter.drawRect(x: end.x() - 1, y: end.y() - 1, w: 3, h: 3);
142
143 QPainterPath curvePath;
144 curvePath.moveTo(p: start);
145 for (qreal t = 0; t <= 1.0; t+=1.0/curveScale) {
146 QPoint to;
147 to.setX(yAxis + curveScale * t);
148 to.setY(xAxis - curveScale * curve.valueForProgress(progress: t));
149 curvePath.lineTo(p: to);
150 }
151 painter.setRenderHint(hint: QPainter::Antialiasing, on: true);
152 painter.strokePath(path: curvePath, pen: QColor(32, 32, 32));
153 painter.setRenderHint(hint: QPainter::Antialiasing, on: false);
154 QListWidgetItem *item = new QListWidgetItem;
155 item->setIcon(QIcon(pix));
156 item->setText(metaEnum.key(index: i));
157 m_ui.easingCurvePicker->addItem(aitem: item);
158 }
159}
160
161void Window::startAnimation()
162{
163 m_anim->setStartValue(QPointF(0, 0));
164 m_anim->setEndValue(QPointF(100, 100));
165 m_anim->setDuration(2000);
166 m_anim->setLoopCount(-1); // forever
167 m_anim->start();
168}
169
170void Window::curveChanged(int row)
171{
172 QEasingCurve::Type curveType = (QEasingCurve::Type)row;
173 m_anim->setEasingCurve(createEasingCurve(curveType));
174 m_anim->setCurrentTime(0);
175
176 bool isElastic = curveType >= QEasingCurve::InElastic && curveType <= QEasingCurve::OutInElastic;
177 bool isBounce = curveType >= QEasingCurve::InBounce && curveType <= QEasingCurve::OutInBounce;
178 m_ui.periodSpinBox->setEnabled(isElastic);
179 m_ui.amplitudeSpinBox->setEnabled(isElastic || isBounce);
180 m_ui.overshootSpinBox->setEnabled(curveType >= QEasingCurve::InBack && curveType <= QEasingCurve::OutInBack);
181}
182
183void Window::pathChanged(QAbstractButton *button)
184{
185 const int index = m_ui.buttonGroup->id(button);
186 m_anim->setPathType(Animation::PathType(index));
187}
188
189void Window::periodChanged(double value)
190{
191 QEasingCurve curve = m_anim->easingCurve();
192 curve.setPeriod(value);
193 m_anim->setEasingCurve(curve);
194}
195
196void Window::amplitudeChanged(double value)
197{
198 QEasingCurve curve = m_anim->easingCurve();
199 curve.setAmplitude(value);
200 m_anim->setEasingCurve(curve);
201}
202
203void Window::overshootChanged(double value)
204{
205 QEasingCurve curve = m_anim->easingCurve();
206 curve.setOvershoot(value);
207 m_anim->setEasingCurve(curve);
208}
209
210

source code of qtbase/examples/widgets/animation/easing/window.cpp