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| // CGRectを拡大する | |
| extension CGRect { | |
| func enlarge(rate :CGFloat) -> CGRect { | |
| if rate > 1 { | |
| let distanceRate = (rate - 1) / 2 | |
| let distanceX = -width * distanceRate | |
| let distanceY = -height * distanceRate | |
| return insetBy(dx: distanceX, dy: distanceY) | |
| } | |
| return self |