// http://blog.allanbishop.com/box2d-2-1a-tutorial-part-1/
public ApplicationSprite()
{
_world = new b2World(new b2Vec2(0, 10), true);
var groundBodyDef = new b2BodyDef();
groundBodyDef.position.Set(SWF_HALF_WIDTH / PIXELS_TO_METRE,
SWF_HEIGHT / PIXELS_TO_METRE - 20 / PIXELS_TO_METRE);
var groundBody = _world.CreateBody(groundBodyDef);
var groundBox = new b2PolygonShape();
groundBox.SetAsBox(SWF_HALF_WIDTH / PIXELS_TO_METRE,
20 / PIXELS_TO_METRE);
var groundFixtureDef = new b2FixtureDef();
groundFixtureDef.shape = groundBox;
groundFixtureDef.density = 1;
groundFixtureDef.friction = 1;
groundBody.CreateFixture(groundFixtureDef);
var bodyDef = new b2BodyDef();
bodyDef.type = b2Body.b2_dynamicBody;
bodyDef.position.Set(SWF_HALF_WIDTH / PIXELS_TO_METRE, 4);
var body = _world.CreateBody(bodyDef);
var dynamicBox = new b2PolygonShape();
dynamicBox.SetAsBox(1, 1);
var fixtureDef = new b2FixtureDef();
fixtureDef.shape = dynamicBox;
fixtureDef.density = 1;
fixtureDef.friction = 0.3;
body.CreateFixture(fixtureDef);
var debugSprite = new Sprite();
addChild(debugSprite);
var debugDraw = new b2DebugDraw();
debugDraw.SetSprite(debugSprite);
debugDraw.SetDrawScale(PIXELS_TO_METRE);
debugDraw.SetLineThickness(1.0);
debugDraw.SetAlpha(1);
debugDraw.SetFillAlpha(0.4);
debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
_world.SetDebugDraw(debugDraw);
// Add event for main loop
this.stage.enterFrame +=
delegate
{
var timeStep = 1 / 30.0;
var velocityIterations = 6;
var positionIterations = 2;
_world.Step(timeStep, velocityIterations, positionIterations);
_world.ClearForces();
_world.DrawDebugData();
};
}
public ApplicationSprite()
{
#region AtInitializeConsoleFormWriter
var w = new __OutWriter();
var o = Console.Out;
var __reentry = false;
var __buffer = new StringBuilder();
w.AtWrite =
x =>
{
__buffer.Append(x);
};
w.AtWriteLine =
x =>
{
__buffer.AppendLine(x);
};
Console.SetOut(w);
this.AtInitializeConsoleFormWriter = (
Action<string> Console_Write,
Action<string> Console_WriteLine
) =>
{
try
{
w.AtWrite =
x =>
{
o.Write(x);
if (!__reentry)
{
__reentry = true;
Console_Write(x);
__reentry = false;
}
};
w.AtWriteLine =
x =>
{
o.WriteLine(x);
if (!__reentry)
{
__reentry = true;
Console_WriteLine(x);
__reentry = false;
}
};
Console.WriteLine("flash Console.WriteLine should now appear in JavaScript form!");
Console.WriteLine(__buffer.ToString());
}
catch
{
}
};
#endregion
var SCALE = 15; //how many pixels in a meter
var WIDTH_M = DefaultWidth / SCALE; //world width in meters. for this example, world is as large as the screen
var HEIGHT_M = DefaultHeight / SCALE; //world height in meters
//initialize font to draw text with
//var font=new gamejs.font.Font('16px Sans-serif');
//key bindings
//var BINDINGS={accelerate:gamejs.event.K_UP,
// brake:gamejs.event.K_DOWN,
// steer_left:gamejs.event.K_LEFT,
// steer_right:gamejs.event.K_RIGHT};
//initialize display
//var display = gamejs.display.setMode([WIDTH_PX, HEIGHT_PX]);
//SET UP B2WORLD
var b2world = new b2World(new b2Vec2(0, 0), false);
//set up box2d debug draw to draw the bodies for us.
//in a real game, car will propably be drawn as a sprite rotated by the car's angle
var debugDraw = new b2DebugDraw();
debugDraw.SetSprite(this);
debugDraw.SetDrawScale(SCALE);
debugDraw.SetFillAlpha(0.5);
debugDraw.SetLineThickness(1.0);
debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
b2world.SetDebugDraw(debugDraw);
var wheels = new[] {
//top left
new Wheel(b2world: b2world, x :-1, y :-1.2, width :0.4, length :0.8, revolving :true, powered :true),
//top right
new Wheel(b2world: b2world, x :1, y :-1.2, width :0.4, length :0.8, revolving :true, powered :true),
//back left
new Wheel(b2world: b2world, x :-1, y :1.2, width :0.4, length :0.8, revolving :false, powered :false),
//back right
new Wheel(b2world: b2world, x :1, y :1.2, width :0.4, length :0.8, revolving :false, powered :false),
};
Func<double, double, double[]> ff = (a, b) => { return new double[] { a, b }; };
////initialize car
var car = new Car(
b2world: b2world,
width: 2,
length: 4,
position: ff(10, 10),
angle: 180,
power: 60,
max_steer_angle: 20,
max_speed: 60,
wheels: wheels
);
//initialize some props to bounce against
var props = new List<BoxProp>();
//outer walls
props.Add(new BoxProp(b2world, size: ff(WIDTH_M, 1), position: ff(WIDTH_M / 2, 0.5)));
props.Add(new BoxProp(b2world, size: ff(1, HEIGHT_M - 2), position: ff(0.5, HEIGHT_M / 2)));
props.Add(new BoxProp(b2world, size: ff(WIDTH_M, 1), position: ff(WIDTH_M / 2, HEIGHT_M - 0.5)));
props.Add(new BoxProp(b2world, size: ff(1, HEIGHT_M - 2), position: ff(WIDTH_M - 0.5, HEIGHT_M / 2)));
//pen in the center
var center = new double[] { WIDTH_M / 2, HEIGHT_M / 2 };
props.Add(new BoxProp(b2world, size: ff(1, 6), position: ff(center[0] - 3, center[1])));
props.Add(new BoxProp(b2world, size: ff(1, 6), position: ff(center[0] + 3, center[1])));
props.Add(new BoxProp(b2world, size: ff(5, 1), position: ff(center[0], center[1] + 2.5)));
var frameid = 0;
var KEYS_DOWN = new Dictionary<Keys, bool> {
{ Keys.Left, false },
{ Keys.Up, false },
{ Keys.Right, false },
{ Keys.Down, false },
}; //keep track of what keys are held down by the player
this.stage.keyDown +=
e =>
{
Console.WriteLine("keyDown " + new { e.keyCode });
KEYS_DOWN[(Keys)e.keyCode] = true;
};
this.stage.keyUp +=
e =>
{
Console.WriteLine("keyUp " + new { e.keyCode });
KEYS_DOWN[(Keys)e.keyCode] = false;
};
#region tick
Action<double> tick = (msDuration) =>
{
frameid++;
//if (frameid > 1)
// return;
//Console.WriteLine(new { frameid });
//GAME LOOP
//handle events. Key status (depressed or no) is tracked in via KEYS_DOWN associative array
//gamejs.event.get().forEach(function(event){
// //key press
// if (event.type === gamejs.event.KEY_DOWN) KEYS_DOWN[event.key] = true;
// //key release
// else if (event.type === gamejs.event.KEY_UP) KEYS_DOWN[event.key] = false;
//});
//set car controls according to player input
if (KEYS_DOWN[Keys.Up])
{
car.accelerate = ACC_ACCELERATE;
}
else if (KEYS_DOWN[Keys.Down])
{
car.accelerate = ACC_BRAKE;
}
else
{
car.accelerate = ACC_NONE;
}
if (KEYS_DOWN[Keys.Right])
{
car.steer = STEER_RIGHT;
}
else if (KEYS_DOWN[Keys.Left])
{
car.steer = STEER_LEFT;
}
else
{
car.steer = STEER_NONE;
}
////update car
car.update(msDuration);
//update physics world
b2world.Step(msDuration / 1000.0, 10, 8);
//clear applied forces, so they don't stack from each update
b2world.ClearForces();
//fill background
//gamejs.draw.rect(display, '#FFFFFF', new gamejs.Rect([0, 0], [WIDTH_PX, HEIGHT_PX]),0)
//let box2d draw it's bodies
b2world.DrawDebugData();
//fps and car speed display
//display.blit(font.render('FPS: '+parseInt((1000)/msDuration)), [25, 25]);
//display.blit(font.render('SPEED: '+parseInt(Math.ceil(car.getSpeedKMH()))+' km/h'), [25, 55]);
//Console.WriteLine(new { frameid } + " done!");
};
////gamejs.time.fpsCallback(tick, this, 60);
var sw = new Stopwatch();
sw.Start();
this.enterFrame +=
delegate
{
tick(sw.ElapsedMilliseconds);
sw.Restart();
};
#endregion
}
public StarlingGameSpriteWithPhysics()
{
sessionid = random.Next();
//b2Body ground_current = null;
//b2Body air_current = null;
#region ground_b2world
// first frame ... set up our physccs
// zombies!!
ground_b2world = new b2World(new b2Vec2(0, 0), false);
ground_b2world.SetContactListener(
new XContactListener()
);
var ground_b2debugDraw = new b2DebugDraw();
ground_dd = new ScriptCoreLib.ActionScript.flash.display.Sprite();
ground_dd.transform.colorTransform = new ColorTransform(0.0, 0, 1.0);
ground_b2debugDraw.SetSprite(ground_dd);
// textures are 512 pixels, while our svgs are 400px
// so how big is a meter in our game world? :)
ground_b2debugDraw.SetDrawScale(16);
ground_b2debugDraw.SetFillAlpha(0.1);
ground_b2debugDraw.SetLineThickness(1.0);
ground_b2debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
ground_b2world.SetDebugDraw(ground_b2debugDraw);
#endregion
#region groundkarma_b2world
// first frame ... set up our physccs
// zombies!!
groundkarma_b2world = new b2World(new b2Vec2(0, 0), false);
var groundkarma_b2debugDraw = new b2DebugDraw();
groundkarma_dd = new ScriptCoreLib.ActionScript.flash.display.Sprite();
groundkarma_dd.transform.colorTransform = new ColorTransform(0.0, 1.0, 0.0);
groundkarma_b2debugDraw.SetSprite(groundkarma_dd);
// textures are 512 pixels, while our svgs are 400px
// so how big is a meter in our game world? :)
groundkarma_b2debugDraw.SetDrawScale(16);
groundkarma_b2debugDraw.SetFillAlpha(0.1);
groundkarma_b2debugDraw.SetLineThickness(1.0);
groundkarma_b2debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
groundkarma_b2world.SetDebugDraw(groundkarma_b2debugDraw);
#endregion
#region air_b2world
// first frame ... set up our physccs
// zombies!!
air_b2world = new b2World(new b2Vec2(0, 0), false);
var air_b2debugDraw = new b2DebugDraw();
air_dd = new ScriptCoreLib.ActionScript.flash.display.Sprite();
// make it red!
air_dd.transform.colorTransform = new ColorTransform(1.0, 0, 0);
// make it slave
air_dd.alpha = 0.3;
air_b2debugDraw.SetSprite(air_dd);
// textures are 512 pixels, while our svgs are 400px
// so how big is a meter in our game world? :)
air_b2debugDraw.SetDrawScale(16);
air_b2debugDraw.SetFillAlpha(0.1);
air_b2debugDraw.SetLineThickness(1.0);
air_b2debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
air_b2world.SetDebugDraw(air_b2debugDraw);
#endregion
#region damage_b2world
// first frame ... set up our physccs
// zombies!!
damage_b2world = new b2World(new b2Vec2(0, 0), false);
damage_b2world.SetContactListener(
new XContactListener { DiscardSmallImpulse = false }
);
var damage_b2debugDraw = new b2DebugDraw();
damage_dd = new ScriptCoreLib.ActionScript.flash.display.Sprite();
// make it red!
//air_dd.transform.colorTransform = new ColorTransform(1.0, 0, 0);
// make it slave
damage_dd.alpha = 0.3;
damage_b2debugDraw.SetSprite(air_dd);
// textures are 512 pixels, while our svgs are 400px
// so how big is a meter in our game world? :)
damage_b2debugDraw.SetDrawScale(16);
damage_b2debugDraw.SetFillAlpha(0.1);
damage_b2debugDraw.SetLineThickness(1.0);
damage_b2debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
damage_b2world.SetDebugDraw(damage_b2debugDraw);
#endregion
#region smoke_b2world
// first frame ... set up our physccs
// zombies!!
smoke_b2world = new b2World(new b2Vec2(0, 0), false);
var smoke_b2debugDraw = new b2DebugDraw();
smoke_dd = new ScriptCoreLib.ActionScript.flash.display.Sprite();
// make it red!
//air_dd.transform.colorTransform = new ColorTransform(1.0, 0, 0);
// make it slave
smoke_dd.alpha = 0.3;
smoke_b2debugDraw.SetSprite(air_dd);
// textures are 512 pixels, while our svgs are 400px
// so how big is a meter in our game world? :)
smoke_b2debugDraw.SetDrawScale(16);
smoke_b2debugDraw.SetFillAlpha(0.1);
smoke_b2debugDraw.SetLineThickness(1.0);
smoke_b2debugDraw.SetFlags(b2DebugDraw.e_shapeBit);
smoke_b2world.SetDebugDraw(smoke_b2debugDraw);
#endregion
//#region obstacles
//{
// var bodyDef = new b2BodyDef();
// bodyDef.type = Box2D.Dynamics.b2Body.b2_dynamicBody;
// // stop moving if legs stop walking!
// bodyDef.linearDamping = 10.0;
// bodyDef.angularDamping = 0.3;
// //bodyDef.angle = 1.57079633;
// bodyDef.fixedRotation = true;
// var body = air_b2world.CreateBody(bodyDef);
// body.SetPosition(new b2Vec2(10, 10));
// var fixDef = new Box2D.Dynamics.b2FixtureDef();
// fixDef.density = 0.1;
// fixDef.friction = 0.01;
// fixDef.restitution = 0;
// fixDef.shape = new Box2D.Collision.Shapes.b2CircleShape(4);
// var fix = body.CreateFixture(fixDef);
// body.SetPosition(
// new b2Vec2(-8, 0)
// );
//}
//{
// var bodyDef = new b2BodyDef();
// bodyDef.type = Box2D.Dynamics.b2Body.b2_dynamicBody;
// // stop moving if legs stop walking!
// bodyDef.linearDamping = 10.0;
// bodyDef.angularDamping = 0.3;
// //bodyDef.angle = 1.57079633;
// bodyDef.fixedRotation = true;
// var body = ground_b2world.CreateBody(bodyDef);
// body.SetPosition(new b2Vec2(10, 10));
// var fixDef = new Box2D.Dynamics.b2FixtureDef();
// fixDef.density = 0.1;
// fixDef.friction = 0.01;
// fixDef.restitution = 0;
// fixDef.shape = new Box2D.Collision.Shapes.b2CircleShape(4);
// var fix = body.CreateFixture(fixDef);
// body.SetPosition(
// new b2Vec2(8, -8)
// );
//}
//{
// var bodyDef = new b2BodyDef();
// bodyDef.type = Box2D.Dynamics.b2Body.b2_dynamicBody;
// // stop moving if legs stop walking!
// bodyDef.linearDamping = 10.0;
// bodyDef.angularDamping = 0.3;
// //bodyDef.angle = 1.57079633;
// bodyDef.fixedRotation = true;
// var body = groundkarma_b2world.CreateBody(bodyDef);
// body.SetPosition(new b2Vec2(10, 10));
// var fixDef = new Box2D.Dynamics.b2FixtureDef();
// fixDef.density = 0.1;
// fixDef.friction = 0.01;
// fixDef.restitution = 0;
// fixDef.shape = new Box2D.Collision.Shapes.b2CircleShape(4);
// var fix = body.CreateFixture(fixDef);
// body.SetPosition(
// new b2Vec2(8, 8)
// );
//}
//#endregion
physicstime.Start();
this.onbeforefirstframe += (stage, s) =>
{
if (!disablephysicsdiagnostics)
{
s.nativeOverlay.addChild(ground_dd);
s.nativeOverlay.addChild(groundkarma_dd);
s.nativeOverlay.addChild(air_dd);
s.nativeOverlay.addChild(damage_dd);
}
// 1000 / 15
var syncframeinterval = 1000 / 15;
var syncframesince = 0L;
var syncframeextra = 0L;
// NaN ?
syncframeid = 0;
syncframetime = 0;
var prevvelocity = 0.0;
onframe +=
delegate
{
// drop frames
//if (frameid % 2 == 0)
// return;
var physicstime_elapsed = physicstime.ElapsedMilliseconds + syncframeextra;
syncframeextra = 0;
// physicstime_elapsed needs to be split!
var physicstime_elapsed_PRE = physicstime_elapsed;
physicstime.Restart();
// add up the time we are spending
syncframesince += physicstime_elapsed;
#region raise_onsyncframe
var raise_onsyncframe = false;
// time for sync frame yet?
if (syncframesince >= syncframeinterval)
{
// time for syncframe!
raise_onsyncframe = true;
// does it actually help us? disabled for now
var dx = syncframesince - syncframeinterval;
syncframesince = 0;
// Error: raise_onsyncframe: { physicstime_elapsed_PRE = 275, dx = 75, physicstime_elapsed_POST = 0 }
physicstime_elapsed_PRE -= dx;
syncframeextra += dx;
// dropping frames?
//syncframeextra = Math.Min(syncframeextra, syncframeinterval);
}
#endregion
var iterations = 10;
syncframetime += physicstime_elapsed_PRE;
#region PRE Step
//update physics world
ground_b2world.Step(physicstime_elapsed_PRE / 1000.0, iterations, iterations);
groundkarma_b2world.Step(physicstime_elapsed_PRE / 1000.0, iterations, iterations);
air_b2world.Step(physicstime_elapsed_PRE / 1000.0, iterations, iterations);
damage_b2world.Step(physicstime_elapsed_PRE / 1000.0, iterations, iterations);
smoke_b2world.Step(physicstime_elapsed_PRE / 1000.0, iterations, iterations);
#endregion
ground_b2world.ClearForces();
groundkarma_b2world.ClearForces();
air_b2world.ClearForces();
damage_b2world.ClearForces();
smoke_b2world.ClearForces();
#region DrawDebugData ClearForces
if (!disablephysicsdiagnostics)
{
ground_b2world.DrawDebugData();
groundkarma_b2world.DrawDebugData();
air_b2world.DrawDebugData();
damage_b2world.DrawDebugData();
smoke_b2world.DrawDebugData();
}
#endregion
// syncframe
if (raise_onsyncframe)
{
syncframeid++;
this.onsyncframe(stage, s);
foreach (var item in units)
{
item.FeedKarma();
}
}
#region air_dd vs ground_dd
if (current != null)
if (current.body.GetWorld() == air_b2world)
{
air_dd.alpha = 0.6;
ground_dd.alpha = 0.1;
}
else
{
air_dd.alpha = 0.1;
ground_dd.alpha = 0.6;
}
#endregion
#region DisableDefaultContentDransformation
DisableDefaultContentDransformation = true;
{
var cm = new Matrix();
var any_movement = 0.0;
if (current != null)
{
cm.translate(
-(current.body.GetPosition().x * 16),
-(current.body.GetPosition().y * 16)
);
cm.rotate(-current.body.GetAngle() - Math.PI / 2 + current.CameraRotation);
if (current.body.GetType() == Box2D.Dynamics.b2Body.b2_dynamicBody)
{
any_movement = (
current.body.GetLinearVelocity().Length() +
Math.Abs(current.body.GetAngularVelocity())
)
/ 15.0;
}
else
{
// force movement mode in a building
any_movement = 1.0;
}
}
//cm.rotate(-current.GetAngle());
move_zoom +=
(any_movement - 0.5) *
physicstime_elapsed * 0.004;
move_zoom = move_zoom.Max(0.0).Min(1.0);
var xinternalscale = internalscale;
if (disable_movezoom_and_altitude_for_scale)
{
// nop
}
else
{
xinternalscale +=
+0.20 * (1.0 - current.Altitude)
+ ((1.0 - move_zoom) * 0.04);
}
var diagonal = new __vec2
{
x = stage.stageWidth,
y = stage.stageHeight
};
//stagescale = xinternalscale * (stage.stageWidth) / (800.0);
stagescale = xinternalscale * (diagonal.GetLength()) / (1000.0);
cm.scale(stagescale, stagescale);
cm.translate(
(stage.stageWidth * 0.5),
(stage.stageHeight * internal_center_y)
);
Content.transformationMatrix = cm;
ground_dd.transform.matrix = cm;
groundkarma_dd.transform.matrix = cm;
air_dd.transform.matrix = cm;
damage_dd.transform.matrix = cm;
}
#endregion
foreach (var item in units)
{
item.ShowPositionAndAngle();
#region driverseat
if (item.driverseat != null)
if (item.driverseat.driver != null)
{
var driver = item.driverseat.driver;
driver.SetPositionAndAngle(
item.body.GetPosition().x + Math.Cos(item.body.GetAngle() - Math.PI * 0.5 - item.CameraRotation) * 2.2,
item.body.GetPosition().y + Math.Sin(item.body.GetAngle() - Math.PI * 0.5 - item.CameraRotation) * 2.2
,
item.body.GetAngle() - item.CameraRotation
);
driver.ShowPositionAndAngle();
}
#endregion
item.ApplyVelocity();
}
};
};
}