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"""
Demonstrate ability of ImageItem to be used as a canvas for painting with
the mouse.
"""
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore
app = pg.mkQApp("Draw Example")
## Create window with GraphicsView widget
w = pg.GraphicsView()
w.show()
w.resize(800,800)
w.setWindowTitle('pyqtgraph example: Draw')
view = pg.ViewBox()
w.setCentralItem(view)
## lock the aspect ratio
view.setAspectLocked(True)
## Create image item
img = pg.ImageItem(np.zeros((200,200)))
view.addItem(img)
## Set initial view bounds
view.setRange(QtCore.QRectF(0, 0, 200, 200))
## start drawing with 3x3 brush
kern = np.array([
[0.0, 0.5, 0.0],
[0.5, 1.0, 0.5],
[0.0, 0.5, 0.0]
])
img.setDrawKernel(kern, mask=kern, center=(1,1), mode='add')
img.setLevels([0, 10])
if __name__ == '__main__':
pg.exec()
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