Scale image in canvas

Ignition
2

You can scale the image in the call to drawImage. Here’s what is use (bytes is the blob read from the database, you don’t need a temp file):

	width = event.source.getWidth()
	height = event.source.getHeight()
   
	try:
		from javax.imageio import ImageIO
		from java.io import ByteArrayInputStream
		bais = ByteArrayInputStream(bytes)
		image = ImageIO.read(bais)
		bais.close()
		imgRatio = float(image.getWidth())/float(image.getHeight())
		if (imgRatio > 0):
			finalWidth = int(height * imgRatio)
			if (finalWidth > width):
				finalWidth=width;
			finalHeight = int(finalWidth / imgRatio)
			print imgRatio
		else:
			finalWidth = width
			finalHeight = height
			print 'No ratio'
		y = (height-finalHeight) / 2
		g.drawImage(image,1,y,finalWidth,finalHeight,event.source)
	except:
		g.drawString(u'Bild kann nicht angezeigt werden', 10, height/2)