csharp
/
MonoGame.Samples
镜像自地址 https://github.com/CartBlanche/MonoGame-Samples.git


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

namespace FarseerPhysics.SamplesFramework
{
    internal class SimpleDemo9 : PhysicsGameScreen, IDemoScreen
    {
        private Border _border;
        private List<Body> _ramps;
        private Body[] _rectangle = new Body[5];
        private Sprite _rectangleSprite;

        #region IDemoScreen Members

        public string GetTitle()
        {
            return "Friction";
        }

        public string GetDetails()
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("This demo shows several bodys with varying friction.");
            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(0f, 20f);

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

            _ramps = new List<Body>();
            _ramps.Add(BodyFactory.CreateEdge(World, new Vector2(-20f, -11.2f), new Vector2(10f, -3.8f)));
            _ramps.Add(BodyFactory.CreateEdge(World, new Vector2(12f, -5.6f), new Vector2(12f, -3.2f)));

            _ramps.Add(BodyFactory.CreateEdge(World, new Vector2(-10f, 4.4f), new Vector2(20f, -1.4f)));
            _ramps.Add(BodyFactory.CreateEdge(World, new Vector2(-12f, 2.6f), new Vector2(-12f, 5f)));

            _ramps.Add(BodyFactory.CreateEdge(World, new Vector2(-20f, 6.8f), new Vector2(10f, 11.5f)));

            float[] friction = new[] { 0.75f, 0.45f, 0.28f, 0.17f, 0.0f };
            for (int i = 0; i < 5; ++i)
            {
                _rectangle[i] = BodyFactory.CreateRectangle(World, 1.5f, 1.5f, 1f);
                _rectangle[i].BodyType = BodyType.Dynamic;
                _rectangle[i].Position = new Vector2(-18f + 5.2f * i, -13.0f + 1.282f * i);
                _rectangle[i].Friction = friction[i];
            }

            // create sprite based on body
            _rectangleSprite = new Sprite(ScreenManager.Assets.TextureFromShape(_rectangle[0].FixtureList[0].Shape,
                                                                                MaterialType.Squares,
                                                                                Color.ForestGreen, 0.8f));
        }

        public override void Draw(GameTime gameTime)
        {
            ScreenManager.SpriteBatch.Begin(0, null, null, null, null, null, Camera.View);
            for (int i = 0; i < 5; ++i)
            {
                ScreenManager.SpriteBatch.Draw(_rectangleSprite.Texture,
                                               ConvertUnits.ToDisplayUnits(_rectangle[i].Position), null,
                                               Color.White, _rectangle[i].Rotation, _rectangleSprite.Origin, 1f,
                                               SpriteEffects.None, 0f);
            }
            ScreenManager.SpriteBatch.End();
            ScreenManager.LineBatch.Begin(Camera.SimProjection, Camera.SimView);
            for (int i = 0; i < _ramps.Count; ++i)
            {
                ScreenManager.LineBatch.DrawLineShape(_ramps[i].FixtureList[0].Shape, Color.DarkGreen);
            }
            ScreenManager.LineBatch.End();
            _border.Draw();
            base.Draw(gameTime);
        }
    }
}