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);
}
}
}
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