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#!/usr/bin/env python
# Qt tutorial 11.
import sys
import math
from qt import *
class LCDRange(QVBox):
def __init__(self,parent=None,name=None):
QVBox.__init__(self,parent,name)
lcd = QLCDNumber(2,self,'lcd')
self.slider = QSlider(Qt.Horizontal,self,'slider')
self.slider.setRange(0,99)
self.slider.setValue(0)
self.connect(self.slider,SIGNAL('valueChanged(int)'),lcd,SLOT('display(int)'))
self.connect(self.slider,SIGNAL('valueChanged(int)'),self,PYSIGNAL('valueChanged(int)'))
self.setFocusProxy(self.slider)
def value(self):
return self.slider.value()
def setValue(self,value):
self.slider.setValue(value)
def setRange(self,minVal,maxVal):
if minVal < 0 or maxVal > 99 or minVal > maxVal:
raise ValueError, 'LCDRange.setRange(): invalid range'
self.slider.setRange(minVal,maxVal)
class CannonField(QWidget):
def __init__(self,parent=None,name=None):
QWidget.__init__(self,parent,name)
self.ang = 45
self.f = 0
self.timerCount = 0
self.autoShootTimer = QTimer(self,'movement handler')
self.connect(self.autoShootTimer,SIGNAL('timeout()'),self.moveShot)
self.shoot_ang = 0
self.shoot_f = 0
self.setPalette(QPalette(QColor(250,250,200)))
self.barrelRect = QRect(33,-4,15,8)
def angle(self):
return self.ang
def setAngle(self,degrees):
if degrees < 5:
degrees = 5
if degrees > 70:
degrees = 70
if self.ang == degrees:
return
self.ang = degrees
self.repaint(self.cannonRect(),0)
self.emit(PYSIGNAL('angleChanged(int)'),(self.ang,))
def force(self):
return self.f
def setForce(self,newton):
if newton < 0:
newton = 0
if self.f == newton:
return
self.f = newton
self.emit(PYSIGNAL('forceChanged(int)'),(self.f,))
def shoot(self):
if self.autoShootTimer.isActive():
return
self.timerCount = 0
self.shoot_ang = self.ang
self.shoot_f = self.f
self.autoShootTimer.start(50)
def moveShot(self):
r = QRegion(self.shotRect())
self.timerCount = self.timerCount + 1
shotR = self.shotRect()
if shotR.x() > self.width() or shotR.y() > self.height():
self.autoShootTimer.stop()
else:
r = r.unite(QRegion(shotR))
self.repaint(r)
def paintEvent(self,ev):
updateR = ev.rect()
p = QPainter(self)
if updateR.intersects(self.cannonRect()):
self.paintCannon(p)
if self.autoShootTimer.isActive() and updateR.intersects(self.shotRect()):
self.paintShot(p)
def paintShot(self,p):
p.setBrush(Qt.black)
p.setPen(Qt.NoPen)
p.drawRect(self.shotRect())
def paintCannon(self,p):
cr = self.cannonRect()
pix = QPixmap(cr.size())
pix.fill(self,cr.topLeft())
tmp = QPainter(pix)
tmp.setBrush(Qt.blue)
tmp.setPen(Qt.NoPen)
tmp.translate(0,pix.height() - 1)
tmp.drawPie(QRect(-35,-35,70,70),0,90 * 16)
tmp.rotate(-self.ang)
tmp.drawRect(self.barrelRect)
tmp.end()
p.drawPixmap(cr.topLeft(),pix)
def cannonRect(self):
r = QRect(0,0,50,50)
r.moveBottomLeft(self.rect().bottomLeft())
return r
def shotRect(self):
gravity = 4.0
time = self.timerCount / 4.0
velocity = self.shoot_f
radians = self.shoot_ang * 3.14159265 / 180
velx = velocity * math.cos(radians)
vely = velocity * math.sin(radians)
x0 = (self.barrelRect.right() + 5) * math.cos(radians)
y0 = (self.barrelRect.right() + 5) * math.sin(radians)
x = x0 + velx * time
y = y0 + vely * time - 0.5 * gravity * time * time
r = QRect(0,0,6,6)
r.moveCenter(QPoint(x,self.height() - 1 - y))
return r
def sizePolicy(self):
return QSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)
class MyWidget(QWidget):
def __init__(self,parent=None,name=None):
QWidget.__init__(self,parent,name)
quit = QPushButton('&Quit',self,'quit')
quit.setFont(QFont('Times',18,QFont.Bold))
self.connect(quit,SIGNAL('clicked()'),qApp,SLOT('quit()'))
self.angle = LCDRange(self,'angle')
self.angle.setRange(5,70)
self.force = LCDRange(self,'force')
self.force.setRange(10,50)
self.cannonField = CannonField(self,'cannonField')
self.connect(self.angle,PYSIGNAL('valueChanged(int)'),self.cannonField.setAngle)
self.connect(self.cannonField,PYSIGNAL('angleChanged(int)'),self.angle.setValue)
self.connect(self.force,PYSIGNAL('valueChanged(int)'),self.cannonField.setForce)
self.connect(self.cannonField,PYSIGNAL('forceChanged(int)'),self.force.setValue)
shoot = QPushButton('&Shoot',self,'shoot')
shoot.setFont(QFont('Times',18,QFont.Bold))
self.connect(shoot,SIGNAL('clicked()'),self.cannonField.shoot)
grid = QGridLayout(self,2,2,10)
grid.addWidget(quit,0,0)
grid.addWidget(self.cannonField,1,1)
grid.setColStretch(1,10)
leftBox = QVBoxLayout()
grid.addLayout(leftBox,1,0)
leftBox.addWidget(self.angle)
leftBox.addWidget(self.force)
topBox = QHBoxLayout()
grid.addLayout(topBox,0,1)
topBox.addWidget(shoot)
topBox.addStretch(1)
self.angle.setValue(60)
self.force.setValue(25)
self.angle.setFocus()
QApplication.setColorSpec(QApplication.CustomColor)
a = QApplication(sys.argv)
w = MyWidget()
w.setGeometry(100,100,500,355)
a.setMainWidget(w)
w.show()
a.exec_loop()
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