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HTML

              
                #output
              
            
!

CSS

              
                #output
  font-family: monospace
              
            
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JS

              
                # https://github.com/hornairs/blog/blob/master/assets/coffeescripts/flocking/vector.coffee
class Vector
  # Class methods for nondestructively operating
  for name in ['add', 'subtract', 'multiply', 'divide']
    do (name) ->
      Vector[name] = (a, b, useZ) ->
        a.copy()[name](b, useZ)

  isVector: true

  constructor: (@x=0, @y=0, @z=0) ->

  copy: ->
    new Vector(@x, @y, @z)

  magnitude: (useZ) ->
    sum = @x * @x + @y * @y
    sum += @z * @z if useZ
    Math.sqrt sum

  magnitudeSquared: (useZ) ->
    sum = @x * @x + @y * @y
    sum += @z * @z if useZ
    sum

  normalize: (useZ) ->
    m = @magnitude useZ
    @divide m, useZ if m > 0
    @

  limit: (max) ->
    if @magnitude() > max
      @normalize()
      return @multiply(max)
    else
      @

  heading: ->
    -1 * Math.atan2(-1 * @y, @x)

  distance: (other, useZ) ->
    dx = @x - other.x
    dy = @y - other.y
    sum = dx * dx + dy * dy
    if useZ
      dz = @z - other.z
      sum += dz * dz
    Math.sqrt sum

  distanceSquared: (other, useZ) ->
    dx = @x - other.x
    dy = @y - other.y
    sum = dx * dx + dy * dy
    if useZ
      dz = @z - other.z
      sum += dz * dz
    sum

  subtract: (other, useZ) ->
    @x -= other.x
    @y -= other.y
    @z -= other.z if useZ
    @

  add: (other, useZ) ->
    @x += other.x
    @y += other.y
    @z += other.z if useZ
    @

  divide: (n, useZ) ->
    [@x, @y] = [@x / n, @y / n]
    @z = @z / n if useZ
    @

  multiply: (n, useZ) ->
    [@x, @y] = [@x * n, @y * n]
    @z = @z * n if useZ
    @

  dot: (other, useZ) ->
    sum = @x * other.x + @y * other.y
    sum += @z + other.z if useZ
    sum

  # Not the strict projection, the other isn't converted to a unit vector first.
  projectOnto: (other, useZ) ->
    other.copy().multiply(@dot(other, useZ), useZ)

  isZero: (useZ) ->
    result = @x is 0 and @y is 0
    result = result and @z is 0 if useZ
    result

  equals: (other, useZ) ->
    result = other and @x is other.x and @y is other.y
    result = result and @z is other.z if useZ
    result

  # Rotate it around the origin
  # If we ever want to make this also use z: https://en.wikipedia.org/wiki/Axes_conventions
  rotate: (theta) ->
    return @ unless theta
    [@x, @y] = [Math.cos(theta) * @x - Math.sin(theta) * @y, Math.sin(theta) * @x + Math.cos(theta) * @y]
    @

  invalid: () ->
    return (@x is Infinity) || isNaN(@x) || @y is Infinity || isNaN(@y) || @z is Infinity || isNaN(@z)

  toString: (useZ) ->
    useZ = true
    return "{x: #{@x.toFixed(0)}, y: #{@y.toFixed(0)}, z: #{@z.toFixed(0)}}" if useZ
    return "{x: #{@x.toFixed(0)}, y: #{@y.toFixed(0)}}"


    
class Rectangle
  @className: "Rectangle"
  # Class methods for nondestructively operating
  for name in ['add', 'subtract', 'multiply', 'divide']
    do (name) ->
      Rectangle[name] = (a, b) ->
        a.copy()[name](b)

  constructor: (@x=0, @y=0, @width=0, @height=0, @rotation=0) ->

  copy: ->
    new Rectangle(@x, @y, @width, @height, @rotation)

  getPos: ->
    new Vector(@x, @y)

  vertices: ->
    # Counter-clockwise, starting from bottom left (when unrotated)
    [w2, h2, cos, sin] = [@width / 2, @height / 2, Math.cos(@rotation), Math.sin(-@rotation)]
    [
      new Vector @x - (w2 * cos - h2 * sin), @y - (w2 * sin + h2 * cos)
      new Vector @x - (w2 * cos + h2 * sin), @y - (w2 * sin - h2 * cos)
      new Vector @x + (w2 * cos - h2 * sin), @y + (w2 * sin + h2 * cos)
      new Vector @x + (w2 * cos + h2 * sin), @y + (w2 * sin - h2 * cos)
    ]

  lineSegments: ->
    vertices = @vertices()
    lineSegment0 = new LineSegment(vertices[0], vertices[1])
    lineSegment1 = new LineSegment(vertices[1], vertices[2])
    lineSegment2 = new LineSegment(vertices[2], vertices[3])
    lineSegment3 = new LineSegment(vertices[3], vertices[0])
    [lineSegment0, lineSegment1, lineSegment2, lineSegment3]

  touchesRect: (other) ->
    # Whether this rect shares part of any edge with other rect, for non-rotated, non-overlapping rectangles.
    # I think it says kitty-corner rects touch, but I don't think I want that.
    # Float instability might get me, too.
    [bl1, tl1, tr1, br1] = @vertices()
    [bl2, tl2, tr2, br2] = other.vertices()
    return false if tl1.x > tr2.x or tl2.x > tr1.x
    return false if bl1.y > tl2.y or bl2.y > tl1.y
    return true if tl1.x is tr2.x or tl2.x is tr1.x
    return true if tl1.y is bl2.y or tl2.y is bl1.y
    false

  touchesPoint: (p) ->
    # Whether this rect has point p exactly on one of its edges, assuming no rotation.
    [bl, tl, tr, br] = @vertices()
    return false unless p.y >= bl.y and p.y <= tl.y
    return false unless p.x >= bl.x and p.x <= br.x
    return true if p.x is bl.x or p.x is br.x
    return true if p.y is bl.y or p.y is tl.y
    false

  axisAlignedBoundingBox: (rounded=true) ->
    box = @copy()
    return box unless @rotation
    box.rotation = 0
    [left, top] = [9001, 9001]
    for vertex in @vertices()
      [left, top] = [Math.min(left, vertex.x), Math.min(top, vertex.y)]
    if rounded
      [left, top] = [Math.round(left), Math.round(top)]
    [box.width, box.height] = [2 * (@x - left), 2 * (@y - top)]
    box

  distanceToPoint: (p) ->
    # Get p in rect's coordinate space, then operate in one quadrant
    p = Vector.subtract(p, @getPos()).rotate(-@rotation)
    dx = Math.max(Math.abs(p.x) - @width / 2, 0)
    dy = Math.max(Math.abs(p.y) - @height / 2, 0)
    Math.sqrt dx * dx + dy * dy

  distanceSquaredToPoint: (p) ->
    # Doesn't handle rotation; just supposed to be faster than distanceToPoint
    dx = Math.max(Math.abs(p.x) - @width / 2, 0)
    dy = Math.max(Math.abs(p.y) - @height / 2, 0)
    dx * dx + dy * dy

  containsPoint: (p, withRotation=true) ->
    if withRotation and @rotation
      not @distanceToPoint(p)
    else
      @x - @width / 2 < p.x < @x + @width / 2 and @y - @height / 2 < p.y < @y + @height / 2

  intersectsLineSegment: (p1, p2) ->
    [px1, py1, px2, py2] = [p1.x, p1.y, p2.x, p2.y]
    m1 = (py1 - py2) / (px1 - px2)
    b1 = py1 - (m1 * px1)
    vertices = @vertices()
    lineSegments = [[vertices[0], vertices[1]], [vertices[1], vertices[2]], [vertices[2], vertices[3]], [vertices[3], vertices[0]]]
    for lineSegment in lineSegments
      [px1, py1, px2, py2] = [p1.x, p1.y, p2.x, p2.y]
      m2 = (py1 - py2) / (px1 - px2)
      b2 = py1 - (m * px1)
      if m1 != m2
        m = m1 - m2
        b = b2 - b1
        x = b / m
        [littleX, bigX] = if px1 < px2 then [px1, px2] else [px2, px1]
        if x >= littleX and x <= bigX
          y = (m1 * x) + b1
          [littleY, bigY] = if py1 < py2 then [py1, py2] else [py2, py1]
          if littleY <= solution and bigY >= solution
            return true
    false

  intersectsRectangle: (rectangle) ->
    for thisLineSegment in @lineSegments()
      for thatLineSegment in rectangle.lineSegments()
        if thisLineSegment.intersectsLineSegment(thatLineSegment)
          return true
    false

  subtract: (point) ->
    @x -= point.x
    @y -= point.y
    @pos.subtract point
    @

  add: (point) ->
    @x += point.x
    @y += point.y
    @pos.add point
    @

  divide: (n) ->
    [@width, @height] = [@width / n, @height / n]
    @

  multiply: (n) ->
    [@width, @height] = [@width * n, @height * n]
    @

  isEmpty: () ->
    @width == 0 and @height == 0

  invalid: () ->
    return (@x == Infinity) || isNaN(@x) || @y == Infinity || isNaN(@y) || @width == Infinity || isNaN(@width) || @height == Infinity || isNaN(@height) || @rotation == Infinity || isNaN(@rotation)

  toString: ->
    return "{x: #{@x.toFixed(0)}, y: #{@y.toFixed(0)}, w: #{@width.toFixed(0)}, h: #{@height.toFixed(0)}, rot: #{@rotation.toFixed(3)}}"



class Ellipse
  @className: "Ellipse"

  constructor: (@x=0, @y=0, @width=0, @height=0, @rotation=0) ->

  containsPoint: (p, withRotation=true) ->
    [a, b] = [@width / 2, @height / 2]
    [h, k] = [@x, @y]
    [x, y] = [p.x, p.y]
    x2 = Math.pow(x, 2)
    a2 = Math.pow(a, 2)
    a4 = Math.pow(a, 4)
    b2 = Math.pow(b, 2)
    b4 = Math.pow(b, 4)
    h2 = Math.pow(h, 2)
    k2 = Math.pow(k, 2)
    if withRotation and @rotation
      sint = Math.sin(@rotation)
      sin2t = Math.sin(2 * @rotation)
      cost = Math.cos(@rotation)
      cos2t = Math.cos(2 * @rotation)
      numeratorLeft = (-a2 * h * sin2t) + (a2 * k * cos2t) + (a2 * k) + (a2 * x * sin2t)
      numeratorMiddle = Math.SQRT2 * Math.sqrt((a4 * b2 * cos2t) + (a4 * b2) - (a2 * b4 * cos2t) + (a2 * b4) - (2 * a2 * b2 * h2) + (4 * a2 * b2 * h * x) - (2 * a2 * b2 * x2))
      numeratorRight = (b2 * h * sin2t) - (b2 * k * cos2t) + (b2 * k) - (b2 * x * sin2t)
      denominator = (a2 * cos2t) + a2 - (b2 * cos2t) + b2
      solution1 = (numeratorLeft - numeratorMiddle + numeratorRight) / denominator
      solution2 = (numeratorLeft + numeratorMiddle + numeratorRight) / denominator
      if (not isNaN solution1) and (not isNaN solution2)
        [bigSolution, littleSolution] = if solution1 > solution2 then [solution1, solution2] else [solution2, solution1]
        if y > littleSolution and y < bigSolution
          return true
        else
          return false
      else
        return false
    else
      numeratorLeft = a2 * k
      numeratorRight = Math.sqrt((a4 * b2) - (a2 * b2 * h2) + (2 * a2 * b2 * h * x) - (a2 * b2 * x2))
      denominator = a2
      solution1 = (numeratorLeft + numeratorRight) / denominator
      solution2 = (numeratorLeft - numeratorRight) / denominator
      if (not isNaN solution1) and (not isNaN solution2)
        [bigSolution, littleSolution] = if solution1 > solution2 then [solution1, solution2] else [solution2, solution1]
        if y > littleSolution and y < bigSolution
          return true
        else
          return false
      else
        return false
    false

  intersectsLineSegment: (p1, p2) ->
    [px1, py1, px2, py2] = [p1.x, p1.y, p2.x, p2.y]
    m = (py1 - py2) / (px1 - px2)
    m2 = Math.pow(m, 2)
    c = py1 - (m * px1)
    c2 = Math.pow(c, 2)
    [a, b] = [@width / 2, @height / 2]
    [h, k] = [@x, @y]
    a2 = Math.pow(a, 2)
    a4 = Math.pow(a, 2)
    b2 = Math.pow(b, 2)
    b4 = Math.pow(b, 4)
    h2 = Math.pow(h, 2)
    k2 = Math.pow(k, 2)
    sint = Math.sin(@rotation)
    sin2t = Math.sin(2 * @rotation)
    cost = Math.cos(@rotation)
    cos2t = Math.cos(2 * @rotation)
    if (not isNaN m) and m != Infinity and m != -Infinity
      numeratorLeft = (-a2 * c * m * cos2t) - (a2 * c * m) + (a2 * c * sin2t) - (a2 * h * m * sin2t) - (a2 * h * cos2t) + (a2 * h) + (a2 * k * m * cos2t) + (a2 * k * m) - (a2 * k * sin2t)
      numeratorMiddle = Math.SQRT2 * Math.sqrt((a4 * b2 * m2 * cos2t) + (a4 * b2 * m2) - (2 * a4 * b2 * m * sin2t) - (a4 * b2 * cos2t) + (a4 * b2) - (a2 * b4 * m2 * cos2t) + (a2 * b4 * m2) + (2 * a2 * b4 * m * sin2t) + (a2 * b4 * cos2t) + (a2 * b4) - (2 * a2 * b2 * c2) - (4 * a2 * b2 * c * h * m) + (4 * a2 * b2 * c * k) - (2 * a2 * b2 * h2 * m2) + (4 * a2 * b2 * h * k * m) - (2 * a2 * b2 * k2))
      numeratorRight = (b2 * c * m * cos2t) - (b2 * c * m) - (b2 * c * sin2t) + (b2 * h * m * sin2t) + (b2 * h * cos2t) + (b2 * h) - (b2 * k * m * cos2t) + (b2 * k * m) + (b2 * k * sin2t)
      denominator = (a2 * m2 * cos2t) + (a2 * m2) - (2 * a2 * m * sin2t) - (a2 * cos2t) + a2 - (b2 * m2 * cos2t) + (b2 * m2) + (2 * b2 * m * sin2t) + (b2 * cos2t) + b2
      solution1 = (-numeratorLeft - numeratorMiddle + numeratorRight) / denominator
      solution2 = (-numeratorLeft + numeratorMiddle + numeratorRight) / denominator
      if (not isNaN solution1) and (not isNaN solution2)
        [littleX, bigX] = if px1 < px2 then [px1, px2] else [px2, px1]
        if (littleX <= solution1 and bigX >= solution1) or (littleX <= solution2 and bigX >= solution2)
          return true
      if (not isNaN solution1) or (not isNaN solution2)
        solution = if not isNaN solution1 then solution1 else solution2
        [littleX, bigX] = if px1 < px2 then [px1, px2] else [px2, px1]
        if littleX <= solution and bigX >= solution
          return true
      else
        return false
    else
      x = px1
      x2 = Math.pow(x, 2)
      numeratorLeft = (-a2 * h * sin2t) + (a2 * k * cos2t) + (a2 * k) + (a2 * x * sin2t)
      numeratorMiddle = Math.SQRT2 * Math.sqrt((a4 * b2 * cos2t) + (a4 * b2) - (a2 * b4 * cos2t) + (a2 * b4) - (2 * a2 * b2 * h2) + (4 * a2 * b2 * h * x) - (2 * a2 * b2 * x2))
      numeratorRight = (b2 * h * sin2t) - (b2 * k * cos2t) + (b2 * k) - (b2 * x * sin2t)
      denominator = (a2 * cos2t) + a2 - (b2 * cos2t) + b2
      solution1 = (numeratorLeft - numeratorMiddle + numeratorRight) / denominator
      solution2 = (numeratorLeft + numeratorMiddle + numeratorRight) / denominator
      if (not isNaN solution1) or (not isNaN solution2)
        solution = if not isNaN solution1 then solution1 else solution2
        [littleY, bigY] = if py1 < py2 then [py1, py2] else [py2, py1]
        if littleY <= solution and bigY >= solution
          return true
      else
        return false
    false


  toString: ->
    return "{x: #{@x.toFixed(0)}, y: #{@y.toFixed(0)}, w: #{@width.toFixed(0)}, h: #{@height.toFixed(0)}, rot: #{@rotation.toFixed(3)}}"



class LineSegment
  @className: "LineSegment"

  constructor: (@a, @b) ->
    @slope = (@a.y - @b.y) / (@a.x - @b.x)
    @y0 = @a.y - (@slope * @a.x)
    @left = if @a.x < @b.x then @a else @b
    @right = if @a.x > @b.x then @a else @b
    @bottom = if @a.y < @b.y then @a else @b
    @top = if @a.y > @b.y then @a else @b

  y: (x) ->
    (@slope * x) + @y0

  x: (y) ->
    (y - @y0) / @slope

  intersectsLineSegment: (lineSegment) ->
    if lineSegment.slope == @slope
      if lineSegment.y0 == @y0
        if lineSegment.left.x == @left.x or lineSegment.left.x == @right.x or lineSegment.right.x == @right.x or lineSegment.right.x == @left.x
          # segments are of the same line with shared start and/or end points
          return true
        else
          [left, right] = if lineSegment.left.x < @left.x then [lineSegment, @] else [@, lineSegment]
          if left.right.x > right.left.x
            # segments are of the same line and one is contained within the other
            return true
    else if Math.abs(@slope) != Infinity and Math.abs(lineSegment.slope) != Infinity
      x = (lineSegment.y0 - @y0) / (@slope - lineSegment.slope)
      if x >= @left.x and x <= @right.x and x >= lineSegment.left.x and x <= lineSegment.right.x
        return true
    else if Math.abs(@slope) != Infinity or Math.abs(lineSegment.slope) != Infinity
      [vertical, nonvertical] = if Math.abs(@slope) != Infinity then [lineSegment, @] else [@, lineSegment]
      x = vertical.a.x
      bottom = vertical.bottom.y
      top = vertical.top.y
      y = nonvertical.y(x)
      left = nonvertical.left.x
      right = nonvertical.right.x
      if y >= bottom and y <= top and x >= left and x <= right
        return true
    false

  pointOnLine: (point, segment=true) ->
    if point.y == @y(point.x)
      if segment
        [littleY, bigY] = if @a.y < @b.y then [@a.y, @b.y] else [@b.y, @a.y]
        if littleY <= point.y and bigY >= point.y
          return true
    else
      return true
    false

  toString: ->
    "lineSegment(a=#{@a}, b=#{@b}, slope=#{@slope}, y0=#{@y0}, left=#{@left}, right=#{@right}, bottom=#{@bottom}, top=#{@top})"


class Thang
  constructor: (@pos, @width=1, @height=1, @depth=1, @shape="box", @rotation=0) ->
    @pos = new Vector(@pos?.x or 0, @pos?.y or 0, @pos?.z or @depth / 2) unless @pos?.isVector

  rectangle: ->
    new Rectangle @pos.x, @pos.y, @width, @height, @rotation

  ellipse: ->
    new Ellipse @pos.x, @pos.y, @width, @height, @rotation

  isGrounded: ->
    @pos.z <= @depth / 2

  isAirborne: ->
    @pos.z > @depth / 2

  contains: (thang) ->
    # Determines whether thang's center is within our bounds.
    if @shape in ["ellipsoid", "disc"]
      @ellipse().containsPoint thang.pos
    else  # box, rectangle
      @rectangle().containsPoint thang.pos

  distance: (thang) ->
    # Determines the distance between the closest edges of @ and thang (0 if touching)
    # TODO: make this aware of the shapes involved
    # TODO: do it at all
    # http://uclue.com/?xq=4737
    # http://stackoverflow.com/questions/401847/circle-rectangle-collision-detection-intersection
    # http://www.gamasutra.com/view/feature/131598/advanced_collision_detection_.php?print=1
    if thang.isVector
      return @pos.distance thang
    @pos.distance thang.pos

  distanceSquared: (thang) ->
    if thang.isVector
      return @pos.distanceSquared thang
    @pos.distanceSquared thang.pos

  intersects: (thang, t1=null) ->
    [elliptical, rectangular] = [["ellipsoid", "disc"], ["box", "sheet"]]
    t1 ?= @
    t2 = thang
    if t1.contains(t2)
      return true
    if t1.shape in elliptical and t2.shape in elliptical
      thisEllipse = t1.ellipse()
      thatEllipse = t2.ellipse()
      return thisEllipse.intersectsEllipse(thatEllipse)
    if (t1.shape in elliptical and t2.shape in rectangular) or (t1.shape in rectangular and t2.shape in elliptical)
      [ellipse, rectangle] = if t1.shape in elliptical then [t1.ellipse(), t2.rectangle()] else [t2.ellipse(), t1.rectangle()]
      vertices = rectangle.vertices()
      lineSegments = [[vertices[0], vertices[1]], [vertices[1], vertices[2]], [vertices[2], vertices[3]], [vertices[3], vertices[0]]]
      for lineSegment in lineSegments
        [p1, p2] = [lineSegment[0], lineSegment[1]]
        if ellipse.intersectsLineSegment(p1, p2)
          return true
    if t1.shape in rectangular and t2.shape in rectangular
      thisRectangle = t1.rectangle()
      thatRectangle = t2.rectangle()
      if thisRectangle.intersectsRectangle(thatRectangle)
        return true
    false

  toString: ->
    "<#{@shape} - #{@pos.toString()} - #{@width} x #{@height} x #{@depth}"

      
log = (args...) ->
    $('#output').append($('<div></div>').text(args.join(' ')))

ellipse = new Thang({x: 1, y: 2}, 4, 6, 0, "ellipsoid", Math.PI / 4)
log("ellipse with y major axis, off-origin center, and 45 degree rotation", ellipse)
log("ellipse.contains(1, 2) should be true: ", ellipse.contains(new Thang({x: 1, y: 2}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(-1, 3) should be true: ", ellipse.contains(new Thang({x: -1, y: 3}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(0, 4) should be true: ", ellipse.contains(new Thang({x: 0, y: 4}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(1, 4) should be true: ", ellipse.contains(new Thang({x: 1, y: 4}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(3, 0) should be true: ", ellipse.contains(new Thang({x: 3, y: 0}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(1, 0) should be true: ", ellipse.contains(new Thang({x: 1, y: 0}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(0, 1) should be true: ", ellipse.contains(new Thang({x: 0, y: 1}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(-1, 2) should be true: ", ellipse.contains(new Thang({x: -1, y: 2}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(2, 2) should be true: ", ellipse.contains(new Thang({x: 2, y: 2}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(0, 0) should be false: ", ellipse.contains(new Thang({x: 0, y: 0}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(0, 5) should be false: ", ellipse.contains(new Thang({x: 0, y: 5}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(3, 4) should be false: ", ellipse.contains(new Thang({x: 3, y: 4}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(4, 0) should be false: ", ellipse.contains(new Thang({x: 4, y: 0}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(2, -1) should be false: ", ellipse.contains(new Thang({x: 2, y: -1}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(0, -3) should be false: ", ellipse.contains(new Thang({x: 0, y: -3}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(-2, -2) should be false: ", ellipse.contains(new Thang({x: -2, y: -2}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(-2, 0) should be false: ", ellipse.contains(new Thang({x: -2, y: 0}, 0, 0, 0, "ellipsoid")))
log("ellipse.contains(-2, 4) should be false: ", ellipse.contains(new Thang({x: -2, y: 4}, 0, 0, 0, "ellipsoid")))
log("ellipse.intersects(rectangle: 0, 0, 2, 2, 0) should be true: ", ellipse.intersects(new Thang({x: 0, y: 0}, 2, 2, 0, "box", 0)))
log("ellipse.intersects(rectangle: 0, -1, 2, 3, 0) should be true: ", ellipse.intersects(new Thang({x: 0, y: -1}, 2, 3, 0, "box", 0)))
log("ellipse.intersects(rectangle: -1, -0.5, 2rt2, 2rt2, 45) should be true: ", ellipse.intersects(new Thang({x: -1, y: -0.5}, 2 * Math.SQRT2, 2 * Math.SQRT2, 0, "box", Math.PI / 4)))
log("ellipse.intersects(rectangle: -1, -0.5, 2rt2, 2rt2, 0) should be true: ", ellipse.intersects(new Thang({x: -1, y: -0.5}, 2 * Math.SQRT2, 2 * Math.SQRT2, 0, "box", 0)))
log("ellipse.intersects(rectangle: -1, -1, 2rt2, 2rt2, 0) should be true: ", ellipse.intersects(new Thang({x: -1, y: -1}, 2 * Math.SQRT2, 2 * Math.SQRT2, 0, "box", 0)))
log("ellipse.intersects(rectangle: -1, -1, 2rt2, 2rt2, 45) should be false: ", ellipse.intersects(new Thang({x: -1, y: -1}, 2 * Math.SQRT2, 2 * Math.SQRT2, 0, "box", Math.PI / 4)))
log("ellipse.intersects(rectangle: -2, -2, 2, 2, 0) should be false: ", ellipse.intersects(new Thang({x: -2, y: -2}, 2, 2, 0, "box", 0)))
log("ellipse.intersects(rectangle: -Math.SQRT2 / 2, -Math.SQRT2 / 2, Math.SQRT2, Math.SQRT2, 0) should be false: ", ellipse.intersects(new Thang({x: -Math.SQRT2 / 2, y: -Math.SQRT2 / 2}, Math.SQRT2, Math.SQRT2, 0, "box", 0)))
log("ellipse.intersects(rectangle: -Math.SQRT2 / 2, -Math.SQRT2 / 2, Math.SQRT2, Math.SQRT2, Math.PI / 4) should be false: ", ellipse.intersects(new Thang({x: -Math.SQRT2 / 2, y: -Math.SQRT2 / 2}, Math.SQRT2, Math.SQRT2, 0, "box", Math.PI / 4)))
log("ellipse.intersects(rectangle: -2, 0, 2, 2, 0) should be false: ", ellipse.intersects(new Thang({x: -2, y: 0}, 2, 2, 0, "box", 0)))
log("ellipse.intersects(rectangle: 0, -2, 2, 2, 0) should be false: ", ellipse.intersects(new Thang({x: 0, y: -2}, 2, 2, 0, "box", 0)))
rectangle = new Thang({x: 1, y: 1}, 2, 2, 0, "box", 0)
log(rectangle)
log("rectangle.intersects(rectangle: 3, 1, 2, 2, 0) should be true: ", rectangle.intersects(new Thang({x: 3, y: 1}, 2, 2, 0, "box", 0)))
log("rectangle.intersects(rectangle: 3, 3, 2, 2, 0) should be true: ", rectangle.intersects(new Thang({x: 3, y: 3}, 2, 2, 0, "box", 0)))
log("rectangle.intersects(rectangle: 1, 1, 2, 2, 0) should be true: ", rectangle.intersects(new Thang({x: 1, y: 1}, 2, 2, 0, "box", 0)))
log("rectangle.intersects(rectangle: 1, 3, Math.SQRT1_2, Math.SQRT1_2, Math.PI / 4) should be true: ", rectangle.intersects(new Thang({x: 1, y: 1}, Math.SQRT1_2, Math.SQRT1_2, 0, "box", Math.PI / 4)))
log("rectangle.intersects(rectangle: 4, 1, 2, 2, 0) should be false: ", rectangle.intersects(new Thang({x: 4, y: 1}, 2, 2, 0, "box", 0)))
log("rectangle.intersects(rectangle: 3, 4, 2, 2, 0) should be false: ", rectangle.intersects(new Thang({x: 3, y: 4}, 2, 2, 0, "box", 0)))
log("rectangle.intersects(rectangle: 1, 4, 2 * Math.SQRT2, 2 * Math.SQRT2, Math.PI / 4) should be false: ", rectangle.intersects(new Thang({x: 1, y: 4}, Math.SQRT1_2, Math.SQRT1_2, 0, "box", Math.PI / 4)))
log("rectangle.intersects(rectangle: 3, 1, 2, 2, Math.PI / 4) should be true: ", rectangle.intersects(new Thang({x: 3, y: 1}, 2, 2, 0, "box", Math.PI / 4)))
log("rectangle.intersects(rectangle: 1, 3, 2 * Math.SQRT2, 2 * Math.SQRT2, Math.PI / 4) should be true: ", rectangle.intersects(new Thang({x: 1, y: 2}, 2 * Math.SQRT2, 2 * Math.SQRT2, 0, "box", Math.PI / 4)))

rect1 = new Thang({x: 0, y: 0}, 8, 2, 0, "box", Math.PI / 100);
log(rect1.rectangle().vertices())
rect2 = new Thang({x: 0, y: 8}, 8, 2, 0, "box", Math.PI / 100);
log(rect2.rectangle().vertices())
log(rect1.intersects(rect2))
              
            
!
999px
What did the HTML say to the CSS? I like your style.

Console