Added some trigonometry helpers

src/core/tools.coffee

@@ -2,4 +2,53 @@ class Mirage.Tools
   @distantion: (sX, sY, dX, dY) ->
     dX = Math.abs(sX - dX)
     dY = Math.abs(sY - dY)
-    Math.round(Math.sqrt(dX * dX + dY * dY))
+    Math.round(Math.sqrt(dX * dX + dY * dY))
+
+  @getAngle: (x1, y1, x2, y2) ->
+    dx = (x2 - x1)
+    dy = (y2 - y1)
+    return -1 if x1 == x2 && y1 == y2
+
+    # some king of bullshit is going on here
+    # to complicated function, but it works
+
+    if dy == 0
+      if dx >= 0
+        return 0
+      else
+        return Math.PI
+    else
+      angle = Math.atan(dy / dx)
+      if dx < 0 && dy > 0
+        angle += Math.PI
+
+      if dx < 0 && dy < 0
+        angle += Math.PI
+
+      if dx > 0 && dy < 0
+        angle += Math.PI * 2
+
+      if dx == 0 && dy < 0
+        angle += Math.PI * 2
+    angle
+
+
+  @getVector: (angle, c) ->
+    return {x: 0, y: 0} if angle == 0 and c == 0
+    x = Math.round(Math.cos(angle) * c)
+    y = Math.round(Math.sin(angle) * c)
+    {x, y}
+
+
+  @sumVectors: (v1, v2) ->
+    v1XY = Mirage.Tools.getVector(v1.angle, v1.speed)
+    v2XY = Mirage.Tools.getVector(v2.angle, v2.speed)
+
+    vrXY = x: v1XY.x + v2XY.x, y: v1XY.y + v2XY.y
+
+
+    speed = Math.round(Math.sqrt(vrXY.x * vrXY.x + vrXY.y * vrXY.y))
+    angle = Mirage.Tools.getAngle(0, 0, vrXY.x, vrXY.y)
+
+    {speed, angle}
+