CheckAABBvLineCollision() [2/2]

static bool Terraria.Collision.CheckAABBvLineCollision ( Vector2 objectPosition, Vector2 objectDimensions, Vector2 lineStart, Vector2 lineEnd, float lineWidth, ref float collisionPoint )

inlinestatic

Definition at line 246 of file Collision.cs.

    {
        float num = lineWidth * 0.5f;
        Vector2 position = lineStart;
        Vector2 dimensions = lineEnd - lineStart;
        if (dimensions.X > 0f)
        {
            dimensions.X += lineWidth;
            position.X -= num;
        }
        else
        {
            position.X += dimensions.X - num;
            dimensions.X = 0f - dimensions.X + lineWidth;
        }
        if (dimensions.Y > 0f)
        {
            dimensions.Y += lineWidth;
            position.Y -= num;
        }
        else
        {
            position.Y += dimensions.Y - num;
            dimensions.Y = 0f - dimensions.Y + lineWidth;
        }
        if (!CheckAABBvAABBCollision(objectPosition, objectDimensions, position, dimensions))
        {
            return false;
        }
        Vector2 vector = objectPosition - lineStart;
        Vector2 spinningpoint = vector + objectDimensions;
        Vector2 spinningpoint2 = new Vector2(vector.X, spinningpoint.Y);
        Vector2 spinningpoint3 = new Vector2(spinningpoint.X, vector.Y);
        Vector2 vector2 = lineEnd - lineStart;
        float num2 = vector2.Length();
        float num3 = (float)Math.Atan2(vector2.Y, vector2.X);
        Vector2[] array = new Vector2[4]
        {
            vector.RotatedBy(0f - num3),
            spinningpoint3.RotatedBy(0f - num3),
            spinningpoint.RotatedBy(0f - num3),
            spinningpoint2.RotatedBy(0f - num3)
        };
        collisionPoint = num2;
        bool result = false;
        for (int i = 0; i < array.Length; i++)
        {
            if (Math.Abs(array[i].Y) < num && array[i].X < collisionPoint && array[i].X >= 0f)
            {
                collisionPoint = array[i].X;
                result = true;
            }
        }
        Vector2 vector3 = new Vector2(0f, num);
        Vector2 vector4 = new Vector2(num2, num);
        Vector2 vector5 = new Vector2(0f, 0f - num);
        Vector2 vector6 = new Vector2(num2, 0f - num);
        for (int j = 0; j < array.Length; j++)
        {
            int num4 = (j + 1) % array.Length;
            Vector2 vector7 = vector4 - vector3;
            Vector2 vector8 = array[num4] - array[j];
            float num5 = vector7.X * vector8.Y - vector7.Y * vector8.X;
            if (num5 != 0f)
            {
                Vector2 vector9 = array[j] - vector3;
                float num6 = (vector9.X * vector8.Y - vector9.Y * vector8.X) / num5;
                if (num6 >= 0f && num6 <= 1f)
                {
                    float num7 = (vector9.X * vector7.Y - vector9.Y * vector7.X) / num5;
                    if (num7 >= 0f && num7 <= 1f)
                    {
                        result = true;
                        collisionPoint = Math.Min(collisionPoint, vector3.X + num6 * vector7.X);
                    }
                }
            }
            vector7 = vector6 - vector5;
            num5 = vector7.X * vector8.Y - vector7.Y * vector8.X;
            if (num5 == 0f)
            {
                continue;
            }
            Vector2 vector10 = array[j] - vector5;
            float num8 = (vector10.X * vector8.Y - vector10.Y * vector8.X) / num5;
            if (num8 >= 0f && num8 <= 1f)
            {
                float num9 = (vector10.X * vector7.Y - vector10.Y * vector7.X) / num5;
                if (num9 >= 0f && num9 <= 1f)
                {
                    result = true;
                    collisionPoint = Math.Min(collisionPoint, vector5.X + num8 * vector7.X);
                }
            }
        }
        return result;
    }

References System.Math.Abs(), System.array, System.Math.Atan2(), Terraria.Collision.CheckAABBvAABBCollision(), System.Math.Min(), Microsoft.Xna.Framework.Vector2.X, and Microsoft.Xna.Framework.Vector2.Y.