summaryrefslogtreecommitdiffstats
path: root/examples/widgets/animation/easing/easing.py
blob: 18b5c09de3ff111870bb1aadd9d816abc13f3220 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259

#############################################################################
##
## Copyright (C) 2010 Riverbank Computing Limited.
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

from PySide2 import QtCore, QtGui, QtWidgets

import easing_rc
from ui_form import Ui_Form


class Animation(QtCore.QPropertyAnimation):
    LinearPath, CirclePath = range(2)

    def __init__(self, target, prop):
        super(Animation, self).__init__(target, prop)
        self.setPathType(Animation.LinearPath)

    def setPathType(self, pathType):
        self.m_pathType = pathType
        self.m_path = QtGui.QPainterPath()

    def updateCurrentTime(self, currentTime):
        if self.m_pathType == Animation.CirclePath:
            if self.m_path.isEmpty():
                end = self.endValue()
                start = self.startValue()
                self.m_path.moveTo(start)
                self.m_path.addEllipse(QtCore.QRectF(start, end))

            dura = self.duration()
            if dura == 0:
                progress = 1.0
            else:
                progress = (((currentTime - 1) % dura) + 1) / float(dura)

            easedProgress = self.easingCurve().valueForProgress(progress)
            if easedProgress > 1.0:
                easedProgress -= 1.0
            elif easedProgress < 0:
                easedProgress += 1.0

            pt = self.m_path.pointAtPercent(easedProgress)
            self.updateCurrentValue(pt)
            self.valueChanged.emit(pt)
        else:
            super(Animation, self).updateCurrentTime(currentTime)

# PySide2 doesn't support deriving from more than one wrapped class so we use
# composition and delegate the property.
class Pixmap(QtCore.QObject):
    def __init__(self, pix):
        super(Pixmap, self).__init__()

        self.pixmap_item = QtWidgets.QGraphicsPixmapItem(pix)
        self.pixmap_item.setCacheMode(QtWidgets.QGraphicsItem.DeviceCoordinateCache)

    def set_pos(self, pos):
        self.pixmap_item.setPos(pos)

    def get_pos(self):
        return self.pixmap_item.pos()

    pos = QtCore.Property(QtCore.QPointF, get_pos, set_pos)


class Window(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        self.m_iconSize = QtCore.QSize(64, 64)
        self.m_scene = QtWidgets.QGraphicsScene()

        m_ui = Ui_Form()
        m_ui.setupUi(self)
        m_ui.easingCurvePicker.setIconSize(self.m_iconSize)
        m_ui.easingCurvePicker.setMinimumHeight(self.m_iconSize.height() + 50)
        m_ui.buttonGroup.setId(m_ui.lineRadio, 0)
        m_ui.buttonGroup.setId(m_ui.circleRadio, 1)

        dummy = QtCore.QEasingCurve()
        m_ui.periodSpinBox.setValue(dummy.period())
        m_ui.amplitudeSpinBox.setValue(dummy.amplitude())
        m_ui.overshootSpinBox.setValue(dummy.overshoot())

        m_ui.easingCurvePicker.currentRowChanged.connect(self.curveChanged)
        m_ui.buttonGroup.buttonClicked[int].connect(self.pathChanged)
        m_ui.periodSpinBox.valueChanged.connect(self.periodChanged)
        m_ui.amplitudeSpinBox.valueChanged.connect(self.amplitudeChanged)
        m_ui.overshootSpinBox.valueChanged.connect(self.overshootChanged)

        self.m_ui = m_ui
        self.createCurveIcons()

        pix = QtGui.QPixmap(':/images/qt-logo.png')
        self.m_item = Pixmap(pix)
        self.m_scene.addItem(self.m_item.pixmap_item)
        self.m_ui.graphicsView.setScene(self.m_scene)

        self.m_anim = Animation(self.m_item, b'pos')
        self.m_anim.setEasingCurve(QtCore.QEasingCurve.OutBounce)
        self.m_ui.easingCurvePicker.setCurrentRow(int(QtCore.QEasingCurve.OutBounce))

        self.startAnimation()

    def createCurveIcons(self):
        pix = QtGui.QPixmap(self.m_iconSize)
        painter = QtGui.QPainter()

        gradient = QtGui.QLinearGradient(0, 0, 0, self.m_iconSize.height())
        gradient.setColorAt(0.0, QtGui.QColor(240, 240, 240))
        gradient.setColorAt(1.0, QtGui.QColor(224, 224, 224))

        brush = QtGui.QBrush(gradient)

        # The original C++ code uses undocumented calls to get the names of the
        # different curve types.  We do the Python equivalant (but without
        # cheating)
        curve_types = [(n, c) for n, c in QtCore.QEasingCurve.__dict__.items()
                        if isinstance(c, QtCore.QEasingCurve.Type) \
                            and c != QtCore.QEasingCurve.Custom    \
                            and c != QtCore.QEasingCurve.NCurveTypes \
                            and c != QtCore.QEasingCurve.TCBSpline]
        curve_types.sort(key=lambda ct: ct[1])

        painter.begin(pix)

        for curve_name, curve_type in curve_types:
            painter.fillRect(QtCore.QRect(QtCore.QPoint(0, 0), self.m_iconSize), brush)
            curve = QtCore.QEasingCurve(curve_type)

            painter.setPen(QtGui.QColor(0, 0, 255, 64))
            xAxis = self.m_iconSize.height() / 1.5
            yAxis = self.m_iconSize.width() / 3.0
            painter.drawLine(0, xAxis, self.m_iconSize.width(),  xAxis)
            painter.drawLine(yAxis, 0, yAxis, self.m_iconSize.height())

            curveScale = self.m_iconSize.height() / 2.0

            painter.setPen(QtCore.Qt.NoPen)

            # Start point.
            painter.setBrush(QtCore.Qt.red)
            start = QtCore.QPoint(yAxis,
                    xAxis - curveScale * curve.valueForProgress(0))
            painter.drawRect(start.x() - 1, start.y() - 1, 3, 3)

            # End point.
            painter.setBrush(QtCore.Qt.blue)
            end = QtCore.QPoint(yAxis + curveScale,
                    xAxis - curveScale * curve.valueForProgress(1))
            painter.drawRect(end.x() - 1, end.y() - 1, 3, 3)

            curvePath = QtGui.QPainterPath()
            curvePath.moveTo(QtCore.QPointF(start))
            t = 0.0
            while t <= 1.0:
                to = QtCore.QPointF(yAxis + curveScale * t,
                        xAxis - curveScale * curve.valueForProgress(t))
                curvePath.lineTo(to)
                t += 1.0 / curveScale

            painter.setRenderHint(QtGui.QPainter.Antialiasing, True)
            painter.strokePath(curvePath, QtGui.QColor(32, 32, 32))
            painter.setRenderHint(QtGui.QPainter.Antialiasing, False)

            item = QtWidgets.QListWidgetItem()
            item.setIcon(QtGui.QIcon(pix))
            item.setText(curve_name)
            self.m_ui.easingCurvePicker.addItem(item)

        painter.end()

    def startAnimation(self):
        self.m_anim.setStartValue(QtCore.QPointF(0, 0))
        self.m_anim.setEndValue(QtCore.QPointF(100, 100))
        self.m_anim.setDuration(2000)
        self.m_anim.setLoopCount(-1)
        self.m_anim.start()

    def curveChanged(self, row):
        curveType = QtCore.QEasingCurve.Type(row)
        self.m_anim.setEasingCurve(curveType)
        self.m_anim.setCurrentTime(0)

        isElastic = (curveType >= QtCore.QEasingCurve.InElastic
                    and curveType <= QtCore.QEasingCurve.OutInElastic)
        isBounce = (curveType >= QtCore.QEasingCurve.InBounce
                    and curveType <= QtCore.QEasingCurve.OutInBounce)

        self.m_ui.periodSpinBox.setEnabled(isElastic)
        self.m_ui.amplitudeSpinBox.setEnabled(isElastic or isBounce)
        self.m_ui.overshootSpinBox.setEnabled(curveType >= QtCore.QEasingCurve.InBack
                                          and curveType <= QtCore.QEasingCurve.OutInBack)

    def pathChanged(self, index):
        self.m_anim.setPathType(index)

    def periodChanged(self, value):
        curve = self.m_anim.easingCurve()
        curve.setPeriod(value)
        self.m_anim.setEasingCurve(curve)

    def amplitudeChanged(self, value):
        curve = self.m_anim.easingCurve()
        curve.setAmplitude(value)
        self.m_anim.setEasingCurve(curve)

    def overshootChanged(self, value):
        curve = self.m_anim.easingCurve()
        curve.setOvershoot(value)
        self.m_anim.setEasingCurve(curve)


if __name__ == '__main__':

    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Window()
    w.resize(600, 600)
    w.show()
    sys.exit(app.exec_())