Fixed x & y coords less than 0

AlexeyAB

2017-03-17 71a9929af6c3d3ffb9527bb921c5cc4a20971ff6

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aeroplane
bicycle
bird
boat
bottle
bus
car
cat
chair
cow
diningtable
dog
horse
motorbike
person
pottedplant
sheep
sofa
train
tvmonitor