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GeomUtils: center rotation fix

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This commit is contained in:
Viktor Sukochev 2017-09-07 16:30:59 +07:00
parent 7886b60dad
commit 9844a0b465
1 changed files with 41 additions and 35 deletions
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76
Source/model/geom2d/GeomUtils.swift
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@ -1,42 +1,48 @@
open class GeomUtils {
open class func concat(t1: Transform, t2: Transform) -> Transform {
let nm11 = t2.m11 * t1.m11 + t2.m12 * t1.m21
let nm21 = t2.m21 * t1.m11 + t2.m22 * t1.m21
let ndx = t2.dx * t1.m11 + t2.dy * t1.m21 + t1.dx
let nm12 = t2.m11 * t1.m12 + t2.m12 * t1.m22
let nm22 = t2.m21 * t1.m12 + t2.m22 * t1.m22
let ndy = t2.dx * t1.m12 + t2.dy * t1.m22 + t1.dy
return Transform(m11: nm11, m12: nm12, m21: nm21, m22: nm22, dx: ndx, dy: ndy)
}
open class func centerRotation(node: Node, place: Transform, angle: Double) -> Transform {
let center = GeomUtils.center(node: node)
let move = Transform.move(dx: center.x, dy: center.y)
guard let moveInv = move.invert() else {
return Transform()
open class func concat(t1: Transform, t2: Transform) -> Transform {
let nm11 = t2.m11 * t1.m11 + t2.m12 * t1.m21
let nm21 = t2.m21 * t1.m11 + t2.m22 * t1.m21
let ndx = t2.dx * t1.m11 + t2.dy * t1.m21 + t1.dx
let nm12 = t2.m11 * t1.m12 + t2.m12 * t1.m22
let nm22 = t2.m21 * t1.m12 + t2.m22 * t1.m22
let ndy = t2.dx * t1.m12 + t2.dy * t1.m22 + t1.dy
return Transform(m11: nm11, m12: nm12, m21: nm21, m22: nm22, dx: ndx, dy: ndy)
}
let r = Transform().rotate(angle: angle)
let moveAndRotate = GeomUtils.concat(t1: moveInv, t2: r)
let returnToOrig = GeomUtils.concat(t1: moveAndRotate, t2: move)
return GeomUtils.concat(t1: returnToOrig, t2: place)
}
open class func centerScale(node: Node, sx: Double, sy: Double) -> Transform {
let center = GeomUtils.center(node: node)
return Transform.move(dx: center.x * (1.0 - sx), dy: center.y * (1.0 - sy)).scale(sx: sx, sy: sy)
}
open class func center(node: Node) -> Point {
guard let bounds = node.bounds() else {
return Point()
open class func centerRotation(node: Node, place: Transform, angle: Double) -> Transform {
let center = GeomUtils.center(node: node)
return GeomUtils.anchorRotation(node: node, place: place, anchor: center, angle: angle)
}
return Point(x: bounds.x + bounds.w / 2.0, y: bounds.y + bounds.h / 2.0)
}
open class func anchorRotation(node: Node, place: Transform, anchor: Point, angle: Double) -> Transform {
let move = Transform.move(dx: anchor.x, dy: anchor.y)
let asin = sin(angle); let acos = cos(angle)
let rotation = Transform(
m11: acos, m12: -asin,
m21: asin, m22: acos,
dx: 0.0, dy: 0.0
)
let t1 = GeomUtils.concat(t1: move, t2: rotation)
let t2 = GeomUtils.concat(t1: t1, t2: move.invert()!)
let result = GeomUtils.concat(t1: place, t2: t2)
return result
}
open class func centerScale(node: Node, sx: Double, sy: Double) -> Transform {
let center = GeomUtils.center(node: node)
return Transform.move(dx: center.x * (1.0 - sx), dy: center.y * (1.0 - sy)).scale(sx: sx, sy: sy)
}
open class func center(node: Node) -> Point {
guard let bounds = node.bounds() else {
return Point()
}
return Point(x: bounds.x + bounds.w / 2.0, y: bounds.y + bounds.h / 2.0)
}
}