• drag
• rotate
• scale
• keepRatio
• dragRotate
• dragScale

• dragSnap false 40 80

• dragSnapDist 7 20

• rotateSnap false 20 90

• rotateSnapDist 5 20

• rotateRange -180, 180 -90, 90

• attrs.fill white black

• distance 1.2 1.5

• size 5 15

• showBBox

• callback