csharp
/
MonoGame.Samples
oglindă de https://github.com/CartBlanche/MonoGame-Samples.git


			
				
					
						
						
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							using System.Collections.Generic;
using System.Text;
using FarseerPhysics.Collision.Shapes;
using FarseerPhysics.Common;
using FarseerPhysics.Dynamics;
using FarseerPhysics.Factories;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace FarseerPhysics.SamplesFramework
{
    internal class AdvancedDemo2 : PhysicsGameScreen, IDemoScreen
    {
        private Border _border;

        private List<Body> _bridgeBodies;

        private Sprite _bridgeBox;
        private List<Body> _softBodies;
        private Sprite _softBodyBox;
        private Sprite _softBodyCircle;

        #region IDemoScreen Members

        public string GetTitle()
        {
            return "Path generator";
        }

        public string GetDetails()
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("TODO: Add sample description!");
            sb.AppendLine(string.Empty);
            sb.AppendLine("GamePad:");
            sb.AppendLine("  - Move cursor: left thumbstick");
            sb.AppendLine("  - Grab object (beneath cursor): A button");
            sb.AppendLine("  - Drag grabbed object: left thumbstick");
            sb.AppendLine("  - Exit to menu: Back button");
            sb.AppendLine(string.Empty);
            sb.AppendLine("Keyboard:");
            sb.AppendLine("  - Exit to menu: Escape");
            sb.AppendLine(string.Empty);
            sb.AppendLine("Mouse / Touchscreen");
            sb.AppendLine("  - Grab object (beneath cursor): Left click");
            sb.AppendLine("  - Drag grabbed object: move mouse / finger");
            return sb.ToString();
        }

        #endregion

        public override void LoadContent()
        {
            base.LoadContent();

            World.Gravity = new Vector2(0, 9.82f);

            _border = new Border(World, this, ScreenManager.GraphicsDevice.Viewport);

            /* Bridge */
            //We make a path using 2 points.
            Path bridgePath = new Path();
            bridgePath.Add(new Vector2(-15, 5));
            bridgePath.Add(new Vector2(15, 5));
            bridgePath.Closed = false;

            Vertices box = PolygonTools.CreateRectangle(0.125f, 0.5f);
            PolygonShape shape = new PolygonShape(box, 20);

            _bridgeBodies = PathManager.EvenlyDistributeShapesAlongPath(World, bridgePath, shape,
                                                                        BodyType.Dynamic, 29);
            _bridgeBox =
                new Sprite(ScreenManager.Assets.TextureFromShape(shape, MaterialType.Dots, Color.SandyBrown, 1f));

            //Attach the first and last fixtures to the world
            JointFactory.CreateFixedRevoluteJoint(World, _bridgeBodies[0], new Vector2(0f, -0.5f),
                                                  _bridgeBodies[0].Position);
            JointFactory.CreateFixedRevoluteJoint(World, _bridgeBodies[_bridgeBodies.Count - 1], new Vector2(0, 0.5f),
                                                  _bridgeBodies[_bridgeBodies.Count - 1].Position);

            PathManager.AttachBodiesWithRevoluteJoint(World, _bridgeBodies, new Vector2(0f, -0.5f),
                                                      new Vector2(0f, 0.5f),
                                                      false, true);

            /* Soft body */
            //We make a rectangular path.
            Path rectanglePath = new Path();
            rectanglePath.Add(new Vector2(-6, -11));
            rectanglePath.Add(new Vector2(-6, 1));
            rectanglePath.Add(new Vector2(6, 1));
            rectanglePath.Add(new Vector2(6, -11));
            rectanglePath.Closed = true;

            //Creating two shapes. A circle to form the circle and a rectangle to stabilize the soft body.
            List<Shape> shapes = new List<Shape>(2);
            shapes.Add(new PolygonShape(PolygonTools.CreateRectangle(0.5f, 0.5f, new Vector2(-0.1f, 0f), 0f), 1f));
            shapes.Add(new CircleShape(0.5f, 1f));

            //We distribute the shapes in the rectangular path.
            _softBodies = PathManager.EvenlyDistributeShapesAlongPath(World, rectanglePath, shapes,
                                                                      BodyType.Dynamic, 30);
            _softBodyBox =
                new Sprite(ScreenManager.Assets.TextureFromShape(shapes[0], MaterialType.Blank, Color.Silver * 0.8f, 1f));
            _softBodyBox.Origin += new Vector2(ConvertUnits.ToDisplayUnits(0.1f), 0f);
            _softBodyCircle =
                new Sprite(ScreenManager.Assets.TextureFromShape(shapes[1], MaterialType.Waves, Color.Silver, 1f));

            //Attach the bodies together with revolute joints. The rectangular form will converge to a circular form.
            PathManager.AttachBodiesWithRevoluteJoint(World, _softBodies, new Vector2(0f, -0.5f), new Vector2(0f, 0.5f),
                                                      true, true);
        }

        public override void Draw(GameTime gameTime)
        {
            ScreenManager.SpriteBatch.Begin(0, null, null, null, null, null, Camera.View);
            for (int i = 0; i < _softBodies.Count; ++i)
            {
                ScreenManager.SpriteBatch.Draw(_softBodyBox.Texture,
                                               ConvertUnits.ToDisplayUnits(_softBodies[i].Position), null,
                                               Color.White, _softBodies[i].Rotation, _softBodyBox.Origin, 1f,
                                               SpriteEffects.None, 0f);
            }
            for (int i = 0; i < _softBodies.Count; ++i)
            {
                ScreenManager.SpriteBatch.Draw(_softBodyCircle.Texture,
                                               ConvertUnits.ToDisplayUnits(_softBodies[i].Position), null,
                                               Color.White, _softBodies[i].Rotation, _softBodyCircle.Origin, 1f,
                                               SpriteEffects.None, 0f);
            }
            for (int i = 0; i < _bridgeBodies.Count; ++i)
            {
                ScreenManager.SpriteBatch.Draw(_bridgeBox.Texture,
                                               ConvertUnits.ToDisplayUnits(_bridgeBodies[i].Position), null,
                                               Color.White, _bridgeBodies[i].Rotation, _bridgeBox.Origin, 1f,
                                               SpriteEffects.None, 0f);
            }
            ScreenManager.SpriteBatch.End();
            _border.Draw();
            base.Draw(gameTime);
        }
    }
}