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
|
#!/usr/bin/env python
# This is only needed for Python v2 but is harmless for Python v3.
import sip
sip.setapi('QVariant', 2)
from PyQt4 import QtCore, QtGui
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)
# PyQt doesn't support deriving from more than one wrapped class so we use
# composition and delegate the property.
class PixmapItem(QtCore.QObject):
def __init__(self, pix):
super(PixmapItem, self).__init__()
self.pixmap_item = QtGui.QGraphicsPixmapItem(pix)
def _set_pos(self, pos):
self.pixmap_item.setPos(pos)
pos = QtCore.pyqtProperty(QtCore.QPointF, fset=_set_pos)
class Window(QtGui.QWidget):
def __init__(self, parent=None):
super(QtGui.QWidget, self).__init__(parent)
self.m_iconSize = QtCore.QSize(64, 64)
self.m_scene = QtGui.QGraphicsScene()
self.m_ui = Ui_Form()
self.m_ui.setupUi(self)
self.m_ui.easingCurvePicker.setIconSize(self.m_iconSize)
self.m_ui.easingCurvePicker.setMinimumHeight(self.m_iconSize.height() + 50)
self.m_ui.buttonGroup.setId(self.m_ui.lineRadio, 0)
self.m_ui.buttonGroup.setId(self.m_ui.circleRadio, 1)
dummy = QtCore.QEasingCurve()
self.m_ui.periodSpinBox.setValue(dummy.period())
self.m_ui.amplitudeSpinBox.setValue(dummy.amplitude())
self.m_ui.overshootSpinBox.setValue(dummy.overshoot())
self.m_ui.easingCurvePicker.currentRowChanged.connect(self.curveChanged)
self.m_ui.buttonGroup.buttonClicked[int].connect(self.pathChanged)
self.m_ui.periodSpinBox.valueChanged.connect(self.periodChanged)
self.m_ui.amplitudeSpinBox.valueChanged.connect(self.amplitudeChanged)
self.m_ui.overshootSpinBox.valueChanged.connect(self.overshootChanged)
self.createCurveIcons()
pix = QtGui.QPixmap(':/images/qt-logo.png')
self.m_item = PixmapItem(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, '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]
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 = QtGui.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 = QtGui.QApplication(sys.argv)
w = Window()
w.resize(400, 400)
w.show()
sys.exit(app.exec_())
|
