spieleprogrammierer.de - Forum und Wiki zur Spieleprogrammierung und Spieleentwicklung

C#-Quelltext

class MyEntity : Entity
    {
        float nx;             // x-position for dragging
        float ny;             // y-position for dragging
        bool isDragging;      // handles the dragging
        Input input;          // the input shortcut
        Image img;            // the image of the entity

        public MyEntity()
        {
            input = Game.Instance.Input;    // initialize input
            img = Content.myImg;            // initialize img
            AddGraphic(img);                // add img graphic
        }

        public override void Update()
        {
            // call drag process
            Drag();

            base.Update();
        }


        /// <summary>
        /// controls the dragging of the form
        /// </summary>
        private void Drag()
        {
            // if mouse is over image
            if (input.MouseX > X && input.MouseX < X + img.ScaledWidth &&
            input.MouseY > Y && input.MouseY < Y + img.ScaledHeight)
            {
                // if left mouse button was pressed while mouse over image
                if (input.MouseButtonPressed(MouseButton.Left))
                {
                    // calculate new coordinates for the object
                    nx = input.MouseX - X;
                    ny = input.MouseY - Y;

                    // set dragging to true
                    isDragging = true;
                }
            }
            // if mouse is outside of image and left mouse button is down
            if (input.MouseButtonDown(MouseButton.Left))
            {
                // if isDragging is true
                if (isDragging == true)
                {
                    // set new positions
                    X = input.MouseX - nx;
                    Y = input.MouseY - ny;
                }
            }
            // if user releases the left mouse button
            if (input.MouseButtonReleased(MouseButton.Left))
            {
                // set isDragging to false
                isDragging = false;
            }
        }

    }