294 lines
No EOL
9.9 KiB
Python
294 lines
No EOL
9.9 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Created on 2018年7月26日
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# author: Irony
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# site: https://pyqt5.com, https://github.com/892768447
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# email: 892768447@qq.com
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# file: QGraphicsView练习.QGraphicsItem.ttt
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# description:
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__Author__ = """By: Irony
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QQ: 892768447
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Email: 892768447@qq.com"""
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__Copyright__ = 'Copyright (c) 2018 Irony'
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__Version__ = 1.0
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import sys
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from PyQt5.QtCore import Qt, QRectF, QPointF
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from PyQt5.QtGui import QBrush, QPainterPath, QPainter, QColor, QPen, QPixmap
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from PyQt5.QtWidgets import QGraphicsRectItem, QApplication, QGraphicsView, QGraphicsScene, QGraphicsItem
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class GraphicsRectItem(QGraphicsRectItem):
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handleTopLeft = 1
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handleTopMiddle = 2
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handleTopRight = 3
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handleMiddleLeft = 4
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handleMiddleRight = 5
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handleBottomLeft = 6
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handleBottomMiddle = 7
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handleBottomRight = 8
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handleSize = +8.0
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handleSpace = -4.0
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handleCursors = {
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handleTopLeft: Qt.SizeFDiagCursor,
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handleTopMiddle: Qt.SizeVerCursor,
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handleTopRight: Qt.SizeBDiagCursor,
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handleMiddleLeft: Qt.SizeHorCursor,
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handleMiddleRight: Qt.SizeHorCursor,
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handleBottomLeft: Qt.SizeBDiagCursor,
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handleBottomMiddle: Qt.SizeVerCursor,
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handleBottomRight: Qt.SizeFDiagCursor,
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}
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def __init__(self, *args):
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"""
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Initialize the shape.
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"""
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super().__init__(*args)
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self.handles = {}
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self.handleSelected = None
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self.mousePressPos = None
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self.mousePressRect = None
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self.setAcceptHoverEvents(True)
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self.setFlag(QGraphicsItem.ItemIsMovable, True)
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self.setFlag(QGraphicsItem.ItemIsSelectable, True)
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self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
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self.setFlag(QGraphicsItem.ItemIsFocusable, True)
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self.updateHandlesPos()
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def handleAt(self, point):
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"""
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Returns the resize handle below the given point.
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"""
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for k, v, in self.handles.items():
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if v.contains(point):
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return k
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return None
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def hoverMoveEvent(self, moveEvent):
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"""
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Executed when the mouse moves over the shape (NOT PRESSED).
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"""
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if self.isSelected():
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handle = self.handleAt(moveEvent.pos())
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cursor = Qt.ArrowCursor if handle is None else self.handleCursors[handle]
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self.setCursor(cursor)
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super().hoverMoveEvent(moveEvent)
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def hoverLeaveEvent(self, moveEvent):
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"""
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Executed when the mouse leaves the shape (NOT PRESSED).
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"""
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self.setCursor(Qt.ArrowCursor)
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super().hoverLeaveEvent(moveEvent)
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def mousePressEvent(self, mouseEvent):
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"""
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Executed when the mouse is pressed on the item.
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"""
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self.handleSelected = self.handleAt(mouseEvent.pos())
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if self.handleSelected:
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self.mousePressPos = mouseEvent.pos()
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self.mousePressRect = self.boundingRect()
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super().mousePressEvent(mouseEvent)
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def mouseMoveEvent(self, mouseEvent):
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"""
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Executed when the mouse is being moved over the item while being pressed.
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"""
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if self.handleSelected is not None:
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self.interactiveResize(mouseEvent.pos())
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else:
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super().mouseMoveEvent(mouseEvent)
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def mouseReleaseEvent(self, mouseEvent):
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"""
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Executed when the mouse is released from the item.
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"""
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super().mouseReleaseEvent(mouseEvent)
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self.handleSelected = None
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self.mousePressPos = None
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self.mousePressRect = None
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self.update()
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def boundingRect(self):
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"""
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Returns the bounding rect of the shape (including the resize handles).
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"""
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o = self.handleSize + self.handleSpace
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return self.rect().adjusted(-o, -o, o, o)
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def updateHandlesPos(self):
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"""
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Update current resize handles according to the shape size and position.
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"""
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s = self.handleSize
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b = self.boundingRect()
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self.handles[self.handleTopLeft] = QRectF(b.left(), b.top(), s, s)
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self.handles[self.handleTopMiddle] = QRectF(b.center().x() - s / 2, b.top(), s, s)
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self.handles[self.handleTopRight] = QRectF(b.right() - s, b.top(), s, s)
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self.handles[self.handleMiddleLeft] = QRectF(b.left(), b.center().y() - s / 2, s, s)
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self.handles[self.handleMiddleRight] = QRectF(b.right() - s, b.center().y() - s / 2, s, s)
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self.handles[self.handleBottomLeft] = QRectF(b.left(), b.bottom() - s, s, s)
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self.handles[self.handleBottomMiddle] = QRectF(b.center().x() - s / 2, b.bottom() - s, s, s)
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self.handles[self.handleBottomRight] = QRectF(b.right() - s, b.bottom() - s, s, s)
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def interactiveResize(self, mousePos):
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"""
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Perform shape interactive resize.
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"""
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offset = self.handleSize + self.handleSpace
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boundingRect = self.boundingRect()
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rect = self.rect()
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diff = QPointF(0, 0)
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self.prepareGeometryChange()
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if self.handleSelected == self.handleTopLeft:
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fromX = self.mousePressRect.left()
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fromY = self.mousePressRect.top()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setX(toX - fromX)
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diff.setY(toY - fromY)
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boundingRect.setLeft(toX)
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boundingRect.setTop(toY)
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rect.setLeft(boundingRect.left() + offset)
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rect.setTop(boundingRect.top() + offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleTopMiddle:
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fromY = self.mousePressRect.top()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setY(toY - fromY)
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boundingRect.setTop(toY)
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rect.setTop(boundingRect.top() + offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleTopRight:
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fromX = self.mousePressRect.right()
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fromY = self.mousePressRect.top()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setX(toX - fromX)
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diff.setY(toY - fromY)
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boundingRect.setRight(toX)
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boundingRect.setTop(toY)
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rect.setRight(boundingRect.right() - offset)
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rect.setTop(boundingRect.top() + offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleMiddleLeft:
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fromX = self.mousePressRect.left()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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diff.setX(toX - fromX)
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boundingRect.setLeft(toX)
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rect.setLeft(boundingRect.left() + offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleMiddleRight:
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print("MR")
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fromX = self.mousePressRect.right()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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diff.setX(toX - fromX)
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boundingRect.setRight(toX)
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rect.setRight(boundingRect.right() - offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleBottomLeft:
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fromX = self.mousePressRect.left()
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fromY = self.mousePressRect.bottom()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setX(toX - fromX)
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diff.setY(toY - fromY)
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boundingRect.setLeft(toX)
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boundingRect.setBottom(toY)
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rect.setLeft(boundingRect.left() + offset)
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rect.setBottom(boundingRect.bottom() - offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleBottomMiddle:
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fromY = self.mousePressRect.bottom()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setY(toY - fromY)
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boundingRect.setBottom(toY)
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rect.setBottom(boundingRect.bottom() - offset)
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self.setRect(rect)
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elif self.handleSelected == self.handleBottomRight:
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fromX = self.mousePressRect.right()
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fromY = self.mousePressRect.bottom()
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toX = fromX + mousePos.x() - self.mousePressPos.x()
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toY = fromY + mousePos.y() - self.mousePressPos.y()
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diff.setX(toX - fromX)
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diff.setY(toY - fromY)
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boundingRect.setRight(toX)
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boundingRect.setBottom(toY)
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rect.setRight(boundingRect.right() - offset)
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rect.setBottom(boundingRect.bottom() - offset)
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self.setRect(rect)
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self.updateHandlesPos()
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def shape(self):
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"""
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Returns the shape of this item as a QPainterPath in local coordinates.
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"""
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path = QPainterPath()
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path.addRect(self.rect())
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if self.isSelected():
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for shape in self.handles.values():
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path.addEllipse(shape)
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return path
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def paint(self, painter, option, widget=None):
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"""
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Paint the node in the graphic view.
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"""
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painter.setBrush(QBrush(QColor(255, 0, 0, 100)))
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painter.setPen(QPen(QColor(0, 0, 0), 1.0, Qt.SolidLine))
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painter.drawRect(self.rect())
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painter.setRenderHint(QPainter.Antialiasing)
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painter.setBrush(QBrush(QColor(255, 0, 0, 255)))
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painter.setPen(QPen(QColor(0, 0, 0, 255), 1.0, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
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for handle, rect in self.handles.items():
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if self.handleSelected is None or handle == self.handleSelected:
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painter.drawEllipse(rect)
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def main():
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app = QApplication(sys.argv)
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grview = QGraphicsView()
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scene = QGraphicsScene()
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scene.setSceneRect(0, 0, 680, 459)
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scene.addPixmap(QPixmap('01.png'))
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grview.setScene(scene)
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item = GraphicsRectItem(0, 0, 300, 150)
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scene.addItem(item)
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grview.fitInView(scene.sceneRect(), Qt.KeepAspectRatio)
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grview.show()
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sys.exit(app.exec_())
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if __name__ == '__main__':
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main() |