Added new ROI example

examples/ROIExamples.py

@@ -0,0 +1,222 @@
+#!/usr/bin/python -i
+# -*- coding: utf-8 -*-
+## Add path to library (just for examples; you do not need this)
+import sys, os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
+
+
+from pyqtgraph.Qt import QtCore, QtGui
+import numpy as np
+import pyqtgraph as pg
+
+## Create image to display
+arr = np.ones((100, 100), dtype=float)
+arr[45:55, 45:55] = 0
+arr[25, :] = 5
+arr[:, 25] = 5
+arr[75, :] = 5
+arr[:, 75] = 5
+arr[50, :] = 10
+arr[:, 50] = 10
+arr += np.sin(np.linspace(0, 20, 100)).reshape(1, 100)
+arr += np.random.normal(size=(100,100))
+
+
+## create GUI
+app = QtGui.QApplication([])
+w = pg.GraphicsWindow(size=(800,800), border=True)
+
+text = """Data Selection From Image.<br>\n
+Drag an ROI or its handles to update the selected image.<br>
+Hold CTRL while dragging to snap to pixel boundaries<br>
+and 15-degree rotation angles.
+"""
+w1 = w.addLayout(row=0, col=0)
+label1 = w1.addLabel(text, row=0, col=0)
+v1a = w1.addViewBox(row=1, col=0, lockAspect=True)
+v1b = w1.addViewBox(row=2, col=0, lockAspect=True)
+img1a = pg.ImageItem(arr)
+v1a.addItem(img1a)
+img1b = pg.ImageItem()
+v1b.addItem(img1b)
+
+rois = []
+rois.append(pg.RectROI([20, 20], [20, 20], pen=(0,9)))
+rois[-1].addRotateHandle([1,0], [0.5, 0.5])
+rois.append(pg.LineROI([0, 60], [20, 80], width=5, pen=(1,9)))
+rois.append(pg.MultiLineROI([[20, 90], [50, 60], [60, 90]], width=5, pen=(2,9)))
+rois.append(pg.EllipseROI([60, 10], [30, 20], pen=(3,9)))
+rois.append(pg.CircleROI([80, 50], [20, 20], pen=(4,9)))
+#rois.append(pg.LineSegmentROI([[110, 50], [20, 20]], pen=(5,9)))
+#rois.append(pg.PolyLineROI([[110, 60], [20, 30], [50, 10]], pen=(6,9)))
+
+def update(roi):
+    img1b.setImage(roi.getArrayRegion(arr, img1a), levels=(0, arr.max()))
+    v1b.autoRange()
+    
+for roi in rois:
+    roi.sigRegionChanged.connect(update)
+    v1a.addItem(roi)
+
+update(rois[-1])
+    
+
+
+text = """Extraction of traces from image data"""
+w2 = w.addLayout(row=0, col=1)
+label2 = w2.addLabel(text, row=0, col=0)
+v2a = w2.addViewBox(row=1, col=0, lockAspect=True)
+v2b = w2.addPlot(row=2, col=0)
+
+
+text = """Building custom ROI types<Br>
+ROIs can be built with a variety of different handle types<br>
+that scale and rotate the roi around an arbitrary center location
+"""
+w3 = w.addLayout(row=1, col=0)
+label3 = w3.addLabel(text, row=0, col=0)
+v3 = w3.addViewBox(row=1, col=0, lockAspect=True)
+
+r3a = pg.ROI([0,0], [10,10])
+v3.addItem(r3a)
+## handles scaling horizontally around center
+r3a.addScaleHandle([1, 0.5], [0.5, 0.5])
+r3a.addScaleHandle([0, 0.5], [0.5, 0.5])
+
+## handles scaling vertically from opposite edge
+r3a.addScaleHandle([0.5, 0], [0.5, 1])
+r3a.addScaleHandle([0.5, 1], [0.5, 0])
+
+## handles scaling both vertically and horizontally
+r3a.addScaleHandle([1, 1], [0, 0])
+r3a.addScaleHandle([0, 0], [1, 1])
+
+r3b = pg.ROI([20,0], [10,10])
+v3.addItem(r3b)
+## handles rotating around center
+r3b.addRotateHandle([1, 1], [0.5, 0.5])
+r3b.addRotateHandle([0, 0], [0.5, 0.5])
+
+## handles rotating around opposite corner
+r3b.addRotateHandle([1, 0], [0, 1])
+r3b.addRotateHandle([0, 1], [1, 0])
+
+## handles rotating/scaling around center
+r3b.addScaleRotateHandle([0, 0.5], [0.5, 0.5])
+r3b.addScaleRotateHandle([1, 0.5], [0.5, 0.5])
+
+
+text = """Transforming objects with ROI"""
+w4 = w.addLayout(row=1, col=1)
+label4 = w4.addLabel(text, row=0, col=0)
+v4 = w4.addViewBox(row=1, col=0, lockAspect=True)
+g = pg.GridItem()
+v4.addItem(g)
+r4 = pg.ROI([0,0], [100,100])
+r4.addRotateHandle([1,0], [0.5, 0.5])
+r4.addRotateHandle([0,1], [0.5, 0.5])
+img4 = pg.ImageItem(arr)
+v4.addItem(r4)
+img4.setParentItem(r4)
+
+
+
+
+
+#v = w.addViewBox(colspan=2)
+
+#v.invertY(True)  ## Images usually have their Y-axis pointing downward
+#v.setAspectLocked(True)
+
+
+
+### Create image items, add to scene and set position 
+#im1 = pg.ImageItem(arr)
+#im2 = pg.ImageItem(arr)
+#v.addItem(im1)
+#v.addItem(im2)
+#im2.moveBy(110, 20)
+#v.setRange(QtCore.QRectF(0, 0, 200, 120))
+
+#im3 = pg.ImageItem()
+#v2 = w.addViewBox(1,0)
+#v2.addItem(im3)
+#v2.setRange(QtCore.QRectF(0, 0, 60, 60))
+#v2.invertY(True)
+#v2.setAspectLocked(True)
+##im3.moveBy(0, 130)
+#im3.setZValue(10)
+
+#im4 = pg.ImageItem()
+#v3 = w.addViewBox(1,1)
+#v3.addItem(im4)
+#v3.setRange(QtCore.QRectF(0, 0, 60, 60))
+#v3.invertY(True)
+#v3.setAspectLocked(True)
+##im4.moveBy(110, 130)
+#im4.setZValue(10)
+
+### create the plot
+#pi1 = w.addPlot(2,0, colspan=2)
+##pi1 = pg.PlotItem()
+##s.addItem(pi1)
+##pi1.scale(0.5, 0.5)
+##pi1.setGeometry(0, 170, 300, 100)
+
+#lastRoi = None
+
+#def updateRoi(roi):
+    #global im1, im2, im3, im4, arr, lastRoi
+    #if roi is None:
+        #return
+    #lastRoi = roi
+    #arr1 = roi.getArrayRegion(im1.image, img=im1)
+    #im3.setImage(arr1)
+    #arr2 = roi.getArrayRegion(im2.image, img=im2)
+    #im4.setImage(arr2)
+    #updateRoiPlot(roi, arr1)
+    
+#def updateRoiPlot(roi, data=None):
+    #if data is None:
+        #data = roi.getArrayRegion(im1.image, img=im1)
+    #if data is not None:
+        #roi.curve.setData(data.mean(axis=1))
+
+
+### Create a variety of different ROI types
+#rois = []
+#rois.append(pg.TestROI([0,  0], [20, 20], maxBounds=QtCore.QRectF(-10, -10, 230, 140), pen=(0,9)))
+#rois.append(pg.LineROI([0,  0], [20, 20], width=5, pen=(1,9)))
+#rois.append(pg.MultiLineROI([[0, 50], [50, 60], [60, 30]], width=5, pen=(2,9)))
+#rois.append(pg.EllipseROI([110, 10], [30, 20], pen=(3,9)))
+#rois.append(pg.CircleROI([110, 50], [20, 20], pen=(4,9)))
+#rois.append(pg.LineSegmentROI([[110, 50], [20, 20]], pen=(5,9)))
+#rois.append(pg.PolyLineROI([[110, 60], [20, 30], [50, 10]], pen=(6,9)))
+##rois.append(pg.PolygonROI([[2,0], [2.1,0], [2,.1]], pen=(5,9)))
+##rois.append(SpiralROI([20,30], [1,1], pen=mkPen(0)))
+
+### Add each ROI to the scene and link its data to a plot curve with the same color
+#for r in rois:
+    #v.addItem(r)
+    #c = pi1.plot(pen=r.pen)
+    #r.curve = c
+    #r.sigRegionChanged.connect(updateRoi)
+
+#def updateImage():
+    #global im1, arr, lastRoi
+    #r = abs(np.random.normal(loc=0, scale=(arr.max()-arr.min())*0.1, size=arr.shape))
+    #im1.updateImage(arr + r)
+    #updateRoi(lastRoi)
+    #for r in rois:
+        #updateRoiPlot(r)
+    
+### Rapidly update one of the images with random noise    
+#t = QtCore.QTimer()
+#t.timeout.connect(updateImage)
+#t.start(50)
+
+
+
+## Start Qt event loop unless running in interactive mode.
+if sys.flags.interactive != 1:
+    app.exec_()

graphicsItems/ImageItem.py

@@ -343,9 +343,9 @@ class ImageItem(GraphicsObject):
         if ev.button() != QtCore.Qt.LeftButton:
             ev.ignore()
             return
-
-        ev.accept()
-        self.drawAt(ev.pos(), ev)
+        elif self.drawKernel is not None:
+            ev.accept()
+            self.drawAt(ev.pos(), ev)
 
     def mouseClickEvent(self, ev):
         if ev.button() == QtCore.Qt.RightButton:

graphicsItems/ROI.py

@@ -28,7 +28,7 @@ from .UIGraphicsItem import UIGraphicsItem
 __all__ = [
     'ROI', 
     'TestROI', 'RectROI', 'EllipseROI', 'CircleROI', 'PolygonROI', 
-    'LineROI', 'MultiLineROI', 'LineSegmentROI', 'SpiralROI',
+    'LineROI', 'MultiLineROI', 'LineSegmentROI', 'PolyLineROI', 'SpiralROI',
 ]