回答編集履歴
2
サンプルコードの追加
test
CHANGED
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@@ -49,3 +49,129 @@
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通常のwidgetの場合
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QPainter で画像を描画する場合は、drawImage や drawPixmap を使います。
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----
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出典: https://stackoverflow.com/questions/52728462/pyqt-add-rectangle-in-qgraphicsscene
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サンプルコードを数カ所改変しました。
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- 画像との重ね合わせを考慮して、透過色 QtGui.QColor(255, 0, 0, 128)
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- 短形は一つのみ表示 self.removeItem(self._current_rect_item)
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- 不要な設定の削除 ItemIsMovable フラグ
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```python
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from PyQt5 import QtCore, QtGui, QtWidgets
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class GraphicsScene(QtWidgets.QGraphicsScene):
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def __init__(self, parent=None):
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super(GraphicsScene, self).__init__(QtCore.QRectF(-500, -500, 1000, 1000), parent)
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self._start = QtCore.QPointF()
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self._current_rect_item = None
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def mousePressEvent(self, event):
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if self._current_rect_item:
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self.removeItem(self._current_rect_item)
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if self.itemAt(event.scenePos(), QtGui.QTransform()) is None:
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self._current_rect_item = QtWidgets.QGraphicsRectItem()
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self._current_rect_item.setBrush(QtGui.QColor(255, 0, 0, 128))
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# アイテムを移動可能にする -> すぐに削除する為不要
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# self._current_rect_item.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable, True)
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self.addItem(self._current_rect_item)
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self._start = event.scenePos()
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r = QtCore.QRectF(self._start, self._start)
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self._current_rect_item.setRect(r)
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super(GraphicsScene, self).mousePressEvent(event)
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def mouseMoveEvent(self, event):
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if self._current_rect_item is not None:
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r = QtCore.QRectF(self._start, event.scenePos()).normalized()
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self._current_rect_item.setRect(r)
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super(GraphicsScene, self).mouseMoveEvent(event)
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def mouseReleaseEvent(self, event):
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# self._current_rect_item = None
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super(GraphicsScene, self).mouseReleaseEvent(event)
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class MainWindow(QtWidgets.QMainWindow):
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def __init__(self, parent=None):
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super(MainWindow, self).__init__(parent)
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scene =GraphicsScene(self)
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view = QtWidgets.QGraphicsView(scene)
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self.setCentralWidget(view)
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if __name__ == '__main__':
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import sys
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app = QtWidgets.QApplication(sys.argv)
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w = MainWindow()
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w.resize(640, 480)
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w.show()
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sys.exit(app.exec_())
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```
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1
文章を微修正
test
CHANGED
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@@ -36,7 +36,7 @@
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マウスのイベントでアイテムの表示非表示/移動・リサイズを行うことで
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-
選択範囲の枠
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選択範囲の枠描画は実現できます。
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