I am coding an app to solve electrical circuits and I need to model the circuit. To do so, I need to draw Resistors and other shapes on a scene, being able to move it and so on.
The thing is that I am tryng to show a resistor en the scene and I can't find the way. I am tryng by using QGraphicsPathItem but looking at the documentation I am not capable of doing it. I'll show a bit of the code I am writing to solve this part of the app:
1. The first code I show is the Resistor as it should be shown
2. The second part is the way I want to do it, but instead an ellipsis, I want to show a Resistor
### 1st Code
import sys
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtCore import Qt
x0 = 100
y0 = 50
class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.x1 = 12
self.y1 = 33
self.y2 = 18
self.y3 = 15
self.y4 = 9
self.y5 = 3
self.p1 = QtCore.QPoint(0, 0 + self.y1)
self.p2 = QtCore.QPoint(0, 0 + self.y2)
self.p3 = QtCore.QPoint(self.x1, self.y3)
self.p4 = QtCore.QPoint(-self.x1, self.y4)
self.p5 = QtCore.QPoint(self.x1, self.y5)
self.p6 = QtCore.QPoint(-self.x1, -self.y5)
self.p7 = QtCore.QPoint(self.x1, -self.y4)
self.p8 = QtCore.QPoint(-self.x1, -self.y3)
self.p9 = QtCore.QPoint(0, 0 - self.y2)
self.p10 = QtCore.QPoint(0, 0 - self.y1)
def draw_resistor(self,angle=0, x0=0, y0=0):
self.x0 = x0
self.y0 = y0
self.label = QtWidgets.QLabel()
self.canvas = QtGui.QPixmap(200, 100) # This is to create the canvas
self.canvas.fill() # To set the canvas background color to white. If not, we will only see a black frame
self.label.setPixmap(self.canvas)
self.setCentralWidget(self.label)
self.painter = QtGui.QPainter(self.label.pixmap())
self.painter.translate(self.x0,self.y0) # To change the axis origin
self.painter.rotate(angle)
self.painter.drawLines(self.p1,self.p2,self.p2,self.p3,self.p3,self.p4,self.p4,self.p5,self.p5,
self.p6,self.p6,self.p7,self.p7,self.p8,self.p8,self.p9,self.p9,self.p10)
self.painter.end()
def rotate(self,angle=0):
self.painter.rotate(angle)
self.painter.drawLines(self.p1,self.p2,self.p2,self.p3,self.p3,self.p4,self.p4,self.p5,self.p5,
self.p6,self.p6,self.p7,self.p7,self.p8,self.p8,self.p9,self.p9,self.p10)
self.label.update() # Research about this, it could be the key
app = QtWidgets.QApplication(sys.argv)
window = MainWindow()
window.show()
window.draw_resistor(45,x0,y0)
app.exec_()
###################
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### 2nd Code
import sys
from PyQt5.QtWidgets import QApplication, QGraphicsItem, QGraphicsPathItem, QGraphicsView, QGraphicsScene, QGraphicsEllipseItem, QLabel
from PyQt5.QtCore import Qt, QPointF, QRectF, QPoint
from PyQt5.QtGui import QPixmap, QPainter
class MovingObject(QGraphicsEllipseItem):
def __init__(self, x, y, r):
super().__init__(0, 0, r, r)
self.setPos(x, y)
self.setBrush(Qt.blue)
self.setAcceptHoverEvents(True)
# Mouse hover events
def hoverEnterEvent(self, event):
app.instance().setOverrideCursor(Qt.OpenHandCursor)
def hoverLeaveEvent(self, event):
app.instance().restoreOverrideCursor()
# Mouse click events
def mousePressEvent(self, event):
pass
def mouseMoveEvent(self, event):
orig_cursor_position = event.lastScenePos()
updated_cursor_position = event.scenePos()
orig_position = self.scenePos()
updated_cursor_x = updated_cursor_position.x() - orig_cursor_position.x() + orig_position.x()
updated_cursor_y = updated_cursor_position.y() - orig_cursor_position.y() + orig_position.y()
self.setPos(QPointF(updated_cursor_x, updated_cursor_y))
def mouseReleaseEvent(self, event):
print("x: {0}, y: {1}".format(self.pos().x(), self.pos().y()))
class GraphicView(QGraphicsView):
def __init__(self):
super().__init__()
self.scene = QGraphicsScene()
self.setScene(self.scene)
self.setSceneRect(0, 0, 1200, 1000)
self.moveObject = MovingObject(50, 50, 40)
self.moveObject2 = MovingObject(100, 100, 100)
self.scene.addItem(self.moveObject)
self.scene.addItem(self.moveObject2)
app = QApplication(sys.argv)
view = GraphicView()
view.show()
sys.exit(app.exec_())
