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bounded rotate works, ish

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This commit is contained in:
Will Charczuk 2016-09-05 14:03:20 -07:00
parent 8f56e5939b
commit a1835a532d
7 changed files with 60 additions and 27 deletions
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16
box.go
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@ -220,16 +220,20 @@ func (b Box) OuterConstrain(bounds, other Box) Box {
return newBox
}
// Rotate rotates a box's corners by a given radian rotation angle.
func (b Box) Rotate(radians float64) Box {
// BoundedRotate rotates a box's corners by a given radian rotation angle
// and returns the maximum bounds or clipping rectangle.
func (b Box) BoundedRotate(radians float64) Box {
cx, cy := b.Center()
ltx, lty := Math.RotateCoordinate(cx, cy, b.Left, b.Top, radians)
lbx, lby := Math.RotateCoordinate(cx, cy, b.Left, b.Bottom, radians)
rtx, rty := Math.RotateCoordinate(cx, cy, b.Right, b.Top, radians)
rbx, rby := Math.RotateCoordinate(cx, cy, b.Right, b.Bottom, radians)
return Box{
Left: ltx,
Top: lty,
Right: rbx,
Bottom: rby,
Left: Math.MinInt(ltx, lbx),
Top: Math.MinInt(lty, rty),
Right: Math.MaxInt(rtx, rbx),
Bottom: Math.MaxInt(lby, rby),
}
}