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qgraphicsscene.py
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qgraphicsscene.py
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import pandas
from PyQt5 import QtGui
from PyQt5.QtCore import Qt, QRectF, QRect
from PyQt5.QtGui import QRadialGradient, QGradient, QPen, QPainterPath, QTransform, QPainter, QColor
from PyQt5.QtWidgets import QApplication, QGraphicsScene, QGraphicsView, QGraphicsSceneMouseEvent, QGraphicsItem, \
QStyleOptionGraphicsItem, QWidget, QGraphicsRectItem
class MyItem(QGraphicsItem):
def __init__(self, data, parent=None):
QGraphicsItem.__init__(self, parent)
self.num = 1
self.data = data
self.path = QPainterPath()
self.trans = QTransform()
self.cached = False
self.printed = False
self.setZValue(0)
def paint(self, painter: QtGui.QPainter, option: 'QStyleOptionGraphicsItem', widget: QWidget = ...):
close = self.data['close'].reset_index()['close']
close = close - close.min()
close_max = close.max()
close_min = close.min()
if not self.cached:
for i in range(close.size - 1):
self.path.moveTo(i, close[i])
self.path.lineTo(i+1, close[i+1])
self.cached = True
pen = QPen(Qt.white)
pen.setCosmetic(True)
painter.setPen(pen)
painter.drawRect(0, 0, close.size, close_max - close_min)
pen.setColor(Qt.yellow)
painter.setPen(pen)
painter.drawPath(self.path)
if not self.printed:
rec_item = self.scene().addPath(self.path, QPen(Qt.red))
rec_item.setZValue(-10)
self.printed = True
def boundingRect(self):
close = self.data['close'].reset_index()['close']
close_max = close.max()
close_min = close.min()
return QRectF(0, 0, close.size, close_max - close_min)
class MyScene(QGraphicsScene):
def __init__(self, data, parent=None):
QGraphicsScene.__init__(self, parent)
self.data = data
self.rec = QGraphicsRectItem()
self.plot: MyItem(data) = None
self.bounding_rect = QGraphicsRectItem()
self.setBackgroundBrush(QColor('#14161f'))
self.addItem(self.bounding_rect)
self.printed = False
def mouseMoveEvent(self, event: 'QGraphicsSceneMouseEvent'):
print()
print("rec rect : ", self.rec.rect())
print("Scene rect : ", self.sceneRect())
print("ItemBounding rect : ", self.itemsBoundingRect())
print("transform : ", self.plot.transform().m11(), ", ", self.plot.transform().m22())
item = self.itemAt(event.scenePos(), self.plot.transform())
if item and isinstance(item, MyItem):
print()
print('collides path : ', self.rec.collidesWithPath(item.mapToScene(item.path)))
print('collides item : ', self.rec.collidesWithItem(item))
super().mouseMoveEvent(event)
def print_bound(self, rect):
self.bounding_rect.setPen(QPen(Qt.green))
self.bounding_rect.setRect(rect.x() + 5, rect.y() + 5,
rect.width() - 10, rect.height() - 10)
class MyView(QGraphicsView):
def __init__(self, data, parent=None):
QGraphicsView.__init__(self, parent)
self.data = data
self.setMouseTracking(True)
self.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
self.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
def wheelEvent(self, event: QtGui.QWheelEvent):
print("pixel / Data : {}".format(self.width() / len(self.data)))
def resizeEvent(self, event: QtGui.QResizeEvent):
scene: MyScene = self.scene()
scene.setSceneRect(self.rect().x(), self.rect().y(),
self.rect().width(), self.rect().height())
scene.print_bound(self.rect())
plot: QGraphicsItem = scene.plot
trans = QTransform()
close = plot.data['close'].reset_index()['close']
close = close - close.min()
close_max = close.max()
close_min = close.min()
trans.scale(self.width() / len(close),
self.height() / (close_max - close_min))
plot.trans = trans
plot.setTransform(trans)
def mouseMoveEvent(self, event: QtGui.QMouseEvent):
rec: QGraphicsRectItem = self.scene().rec
rec.setRect(event.pos().x() - 5, event.pos().y() - 5, 10, 10)
super().mouseMoveEvent(event)
if __name__ == '__main__':
df = pandas.read_pickle('bitmex_1m_2018.pkl')
data = df[-5000:]
app = QApplication([])
scene = MyScene(data)
view = MyView(data)
view.setScene(scene)
rec = QGraphicsRectItem(-2, -2, 4, 4)
rec.setPen(Qt.white)
scene.rec = rec
scene.addItem(rec)
plot = MyItem(data)
scene.addItem(plot)
scene.plot = plot
view.show()
app.exec_()