162 lines
4.6 KiB
Python
162 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Demonstrates a variety of uses for ROI. This class provides a user-adjustable
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region of interest marker. It is possible to customize the layout and
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function of the scale/rotate handles in very flexible ways.
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"""
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import initExample ## Add path to library (just for examples; you do not need this)
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import pyqtgraph as pg
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from pyqtgraph.Qt import QtCore, QtGui
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import numpy as np
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pg.setConfigOptions(imageAxisOrder='row-major')
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## Create image to display
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arr = np.ones((100, 100), dtype=float)
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arr[45:55, 45:55] = 0
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arr[25, :] = 5
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arr[:, 25] = 5
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arr[75, :] = 5
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arr[:, 75] = 5
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arr[50, :] = 10
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arr[:, 50] = 10
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arr += np.sin(np.linspace(0, 20, 100)).reshape(1, 100)
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arr += np.random.normal(size=(100,100))
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# add an arrow for asymmetry
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arr[10, :50] = 10
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arr[9:12, 44:48] = 10
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arr[8:13, 44:46] = 10
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## create GUI
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app = pg.mkQApp("ROI Examples")
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w = pg.GraphicsLayoutWidget(show=True, size=(1000,800), border=True)
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w.setWindowTitle('pyqtgraph example: ROI Examples')
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text = """Data Selection From Image.<br>\n
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Drag an ROI or its handles to update the selected image.<br>
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Hold CTRL while dragging to snap to pixel boundaries<br>
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and 15-degree rotation angles.
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"""
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w1 = w.addLayout(row=0, col=0)
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label1 = w1.addLabel(text, row=0, col=0)
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v1a = w1.addViewBox(row=1, col=0, lockAspect=True)
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v1b = w1.addViewBox(row=2, col=0, lockAspect=True)
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img1a = pg.ImageItem(arr)
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v1a.addItem(img1a)
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img1b = pg.ImageItem()
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v1b.addItem(img1b)
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v1a.disableAutoRange('xy')
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v1b.disableAutoRange('xy')
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v1a.autoRange()
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v1b.autoRange()
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rois = []
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rois.append(pg.RectROI([20, 20], [20, 20], pen=(0,9)))
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rois[-1].addRotateHandle([1,0], [0.5, 0.5])
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rois.append(pg.LineROI([0, 60], [20, 80], width=5, pen=(1,9)))
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rois.append(pg.TriangleROI([80, 75], 20, pen=(5, 9)))
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rois.append(pg.MultiRectROI([[20, 90], [50, 60], [60, 90]], width=5, pen=(2,9)))
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rois.append(pg.EllipseROI([60, 10], [30, 20], pen=(3,9)))
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rois.append(pg.CircleROI([80, 50], [20, 20], pen=(4,9)))
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#rois.append(pg.LineSegmentROI([[110, 50], [20, 20]], pen=(5,9)))
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rois.append(pg.PolyLineROI([[80, 60], [90, 30], [60, 40]], pen=(6,9), closed=True))
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def update(roi):
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img1b.setImage(roi.getArrayRegion(arr, img1a), levels=(0, arr.max()))
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v1b.autoRange()
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for roi in rois:
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roi.sigRegionChanged.connect(update)
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v1a.addItem(roi)
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update(rois[-1])
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text = """User-Modifiable ROIs<br>
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Click on a line segment to add a new handle.
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Right click on a handle to remove.
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"""
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w2 = w.addLayout(row=0, col=1)
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label2 = w2.addLabel(text, row=0, col=0)
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v2a = w2.addViewBox(row=1, col=0, lockAspect=True)
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r2a = pg.PolyLineROI([[0,0], [10,10], [10,30], [30,10]], closed=True)
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v2a.addItem(r2a)
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r2b = pg.PolyLineROI([[0,-20], [10,-10], [10,-30]], closed=False)
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v2a.addItem(r2b)
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v2a.disableAutoRange('xy')
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#v2b.disableAutoRange('xy')
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v2a.autoRange()
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#v2b.autoRange()
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text = """Building custom ROI types<Br>
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ROIs can be built with a variety of different handle types<br>
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that scale and rotate the roi around an arbitrary center location
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"""
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w3 = w.addLayout(row=1, col=0)
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label3 = w3.addLabel(text, row=0, col=0)
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v3 = w3.addViewBox(row=1, col=0, lockAspect=True)
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r3a = pg.ROI([0,0], [10,10])
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v3.addItem(r3a)
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## handles scaling horizontally around center
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r3a.addScaleHandle([1, 0.5], [0.5, 0.5])
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r3a.addScaleHandle([0, 0.5], [0.5, 0.5])
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## handles scaling vertically from opposite edge
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r3a.addScaleHandle([0.5, 0], [0.5, 1])
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r3a.addScaleHandle([0.5, 1], [0.5, 0])
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## handles scaling both vertically and horizontally
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r3a.addScaleHandle([1, 1], [0, 0])
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r3a.addScaleHandle([0, 0], [1, 1])
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r3b = pg.ROI([20,0], [10,10])
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v3.addItem(r3b)
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## handles rotating around center
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r3b.addRotateHandle([1, 1], [0.5, 0.5])
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r3b.addRotateHandle([0, 0], [0.5, 0.5])
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## handles rotating around opposite corner
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r3b.addRotateHandle([1, 0], [0, 1])
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r3b.addRotateHandle([0, 1], [1, 0])
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## handles rotating/scaling around center
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r3b.addScaleRotateHandle([0, 0.5], [0.5, 0.5])
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# handles rotating/scaling around arbitrary point
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r3b.addScaleRotateHandle([0.3, 0], [0.9, 0.7])
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v3.disableAutoRange('xy')
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v3.autoRange()
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text = """Transforming objects with ROI"""
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w4 = w.addLayout(row=1, col=1)
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label4 = w4.addLabel(text, row=0, col=0)
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v4 = w4.addViewBox(row=1, col=0, lockAspect=True)
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g = pg.GridItem()
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v4.addItem(g)
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r4 = pg.ROI([0,0], [100,100], resizable=False, removable=True)
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r4.addRotateHandle([1,0], [0.5, 0.5])
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r4.addRotateHandle([0,1], [0.5, 0.5])
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img4 = pg.ImageItem(arr)
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v4.addItem(r4)
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img4.setParentItem(r4)
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v4.disableAutoRange('xy')
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v4.autoRange()
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# Provide a callback to remove the ROI (and its children) when
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# "remove" is selected from the context menu.
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def remove():
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v4.removeItem(r4)
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r4.sigRemoveRequested.connect(remove)
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if __name__ == '__main__':
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pg.exec()
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