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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Box2DX;
using Box2DX.Dynamics;
using Box2DX.Collision;
using Box2DX.Common;
public class ApplicationMain : MonoBehaviour
{
public Material material;
private World world;
private Body body;
private Body groundBody;
private Vec2 translate(Vec2 p)
{
//return new Vec2(p.X * 3 + 100, p.Y * 3 + 100);
return new Vec2(p.X, p.Y);
}
private void Awake()
{
material.SetPass(0);//设置该材质通道，0为默认值
// if bodies reach the end of the world, but it will be slower.
AABB worldAABB = new AABB();
worldAABB.LowerBound.Set(-100.0f, -100.0f);
worldAABB.UpperBound.Set(100.0f, 100.0f);
// Define the gravity vector.
Vec2 gravity = new Vec2(0.0f, -10.0f);
// Do we want to let bodies sleep?
bool doSleep = true;
// Construct a world object, which will hold and simulate the rigid bodies.
world = new World(worldAABB, gravity, doSleep);
// Define the ground body.
BodyDef groundBodyDef = new BodyDef();
groundBodyDef.Position.Set(0.0f, -10.0f);
// Call the body factory which creates the ground box shape.
// The body is also added to the world.
groundBody = world.CreateBody(groundBodyDef);
// Define the ground box shape.
PolygonDef groundShapeDef = new PolygonDef();
// The extents are the half-widths of the box.
groundShapeDef.SetAsBox(50.0f, 10.0f);
// Add the ground shape to the ground body.
groundBody.CreateShape(groundShapeDef);
// Define the dynamic body. We set its position and call the body factory.
BodyDef bodyDef = new BodyDef();
bodyDef.Position.Set(0.0f, 80.0f);
body = world.CreateBody(bodyDef);
// Define another box shape for our dynamic body.
PolygonDef shapeDef = new PolygonDef();
shapeDef.SetAsBox(1.0f, 1.0f);
// Set the box density to be non-zero, so it will be dynamic.
shapeDef.Density = 1.0f;
// Override the default friction.
shapeDef.Friction = 0.3f;
// Add the shape to the body.
body.CreateShape(shapeDef);
// Now tell the dynamic body to compute it's mass properties base
// on its shape.
body.SetMassFromShapes();
// Prepare for simulation. Typically we use a time step of 1/60 of a
// second (60Hz) and 10 iterations. This provides a high quality simulation
// in most game scenarios.
}
private void Update()
{
float timeStep = 1.0f / 60.0f;
int velocityIterations = 8;
int positionIterations = 1;
world.Step(timeStep, velocityIterations, positionIterations);
}
private void OnRenderObject()
{
//绘制正四边形，提供的坐标必须是顺时针或者逆时针
Vec2 position = body.GetPosition();
Draw(
translate(new Vec2(position.X + 1, position.Y + 1))
, translate(new Vec2(position.X + 1, position.Y - 1))
, translate(new Vec2(position.X - 1, position.Y - 1))
, translate(new Vec2(position.X - 1, position.Y + 1))
);
position = groundBody.GetPosition();
Draw(
translate(new Vec2(position.X + 50, position.Y + 10))
, translate(new Vec2(position.X + 50, position.Y - 10))
, translate(new Vec2(position.X - 50, position.Y - 10))
, translate(new Vec2(position.X - 50, position.Y + 10))
);
}
//绘制四边形,四个点坐标
void Draw(Vec2 p1, Vec2 p2, Vec2 p3, Vec2 p4)
{
GL.PushMatrix();
material.SetPass(0);//设置该材质通道，0为默认值
GL.LoadOrtho();//设置绘制2d图像
GL.Begin(GL.QUADS);//绘制类型为四边形
GL.Vertex3(p1.X / Screen.width, p1.Y / Screen.height, 0);
GL.Vertex3(p2.X / Screen.width, p2.Y / Screen.height, 0);
GL.Vertex3(p3.X / Screen.width, p3.Y / Screen.height, 0);
GL.Vertex3(p4.X / Screen.width, p4.Y / Screen.height, 0);
GL.End();
GL.PopMatrix();
}
}
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