/**
* Copyright ABA ( http://wonderfl.net/user/ABA )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/oNKu
*/
// UpDownRoad.as
// Display a 3d updown road with 3d particles.
package
{
import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Rectangle;
import flash.events.Event;
[SWF(width="465", height="465", backgroundColor="0x000000", frameRate="30")]
public class UpDownRoad extends Sprite
{
private const SCREEN_WIDTH:int = 465;
private const SCREEN_HEIGHT:int = 465;
private const DRAWN_PARTICLES_MAX_COUNT:int = 2000;
private const PROJECTION_RATIO:Number = 128;
private const LOD_DISTANCE:Number = 200;
private const MAX_DEPTH:Number = 500;
private const ROAD_SPACING:Number = 5;
private const ROAD_WIDTH:Number = 64;
private const ROAD_HEIGHT:Number = 6;
private const SIGHT_HEIGHT:Number = 30;
private const BACKGROUND_BOX_SIZE:int = 16;
private const BACKGROUND_R:int = 0x88;
private const BACKGROUND_G:int = 0xcc;
private const BACKGROUND_B:int = 0xff;
private var buffer:BitmapData = new BitmapData(SCREEN_WIDTH, SCREEN_HEIGHT, false, 0);
private var rect:Rectangle = new Rectangle;
private var roads:Vector.<Road> = new Vector.<Road>;
private var particles:Vector.<Particle> = new Vector.<Particle>;
private var drawnParticles:Vector.<DrawnParticle> = new Vector.<DrawnParticle>;
private var dpIndex:int;
private var viewpoint:Vector3 = new Vector3;
private var yaw:Number, pitch:Number, roll:Number;
private var offset:Vector3 = new Vector3;
private var carPosIndex:Number;
private var roadIndex:int;
public function UpDownRoad()
{
addChild(new Bitmap(buffer));
yaw = pitch = roll = 0;
createRoad();
for (var i:int = 0; i < DRAWN_PARTICLES_MAX_COUNT; i++)
drawnParticles.push(new DrawnParticle);
carPosIndex = roads.length - 10;
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
private function onEnterFrame(evt:Event):void
{
buffer.fillRect(buffer.rect, 0x99ffdd);
carPosIndex += 1.7;
if (carPosIndex >= roads.length)
carPosIndex -= roads.length;
var cpi:int = carPosIndex;
var ncpi:int = carPosIndex + 1;
if (ncpi >= roads.length)
ncpi -= roads.length;
var co:Number = carPosIndex - cpi;
var rp:Vector3 = roads[cpi].pos;
var nrp:Vector3 = roads[ncpi].pos;
viewpoint.x += (rp.x * (1 - co) + nrp.x * co - viewpoint.x) * 0.2;
viewpoint.y += (rp.y * (1 - co) + nrp.y * co - viewpoint.y - SIGHT_HEIGHT) * 0.2;
viewpoint.z += (rp.z * (1 - co) + nrp.z * co - viewpoint.z) * 0.2;
var oa:Number = roads[ncpi].angle - roads[cpi].angle;
oa = normalizeAngle(oa);
oa = roads[cpi].angle + oa * co - yaw;
oa = normalizeAngle(oa);
yaw += oa * 0.1;
yaw = normalizeAngle(yaw);
pitch += ((roads[cpi].upDown * (1 - co) + roads[ncpi].upDown * co) * 0.5 - pitch) * 0.2;
roll += (-oa * 0.7 - roll) * 0.1;
drawBackground();
dpIndex = 0;
for each (var p:Particle in particles)
drawParticle(p);
drawnParticles.sort(sortOnZ);
function sortOnZ(v1:DrawnParticle, v2:DrawnParticle):Number
{
if (v1.pos.z < v2.pos.z)
return 1;
else if (v1.pos.z > v2.pos.z)
return -1;
else
return 0;
}
for (var i:int = 0; i < dpIndex; i++)
{
var dp:DrawnParticle = drawnParticles[i];
rect.x = dp.pos.x - dp.width;
rect.y = dp.pos.y - dp.height;
rect.width = dp.width * 2;
rect.height = dp.height * 2;
buffer.fillRect(rect, dp.color);
}
}
private function drawParticle(p:Particle):void
{
offset.x = p.pos.x - viewpoint.x;
offset.y = p.pos.y - viewpoint.y;
offset.z = p.pos.z - viewpoint.z;
offset.rotationYaw(yaw);
offset.rotationPitch(pitch);
offset.rotationRoll(roll);
if (offset.z < -10 || offset.z > MAX_DEPTH)
return;
if (p.detail != null && offset.length < LOD_DISTANCE)
{
for each (var pp:Particle in p.detail)
drawParticle(pp);
return;
}
if (offset.z < 1 || p.width <= 0)
return;
var ar:Number = 1.0 - offset.z / MAX_DEPTH;
if (ar < 0)
return;
var dp:DrawnParticle = drawnParticles[dpIndex];
var zr:Number = 1.0 / offset.z * PROJECTION_RATIO;
dp.pos.x = offset.x * zr + SCREEN_WIDTH / 2;
dp.pos.y = offset.y * zr + SCREEN_HEIGHT / 2;
dp.pos.z = offset.z;
dp.width = p.width * zr;
dp.height = p.height * zr;
dp.color = createColor(p.r, p.g, p.b, 250 * ar);
dpIndex++;
}
private function createColor(r:int, g:int, b:int, a:int):int
{
return int((r * a + BACKGROUND_R * (256 - a)) / 256) * 0x10000 +
int((g * a + BACKGROUND_G * (256 - a)) / 256) * 0x100 +
int((b * a + BACKGROUND_B * (256 - a)) / 256);
}
private function drawBackground():void
{
offset.x = 0;
offset.y = 0;
offset.z = 99999;
offset.rotationPitch(pitch);
var zr:Number = 1.0 / offset.z * PROJECTION_RATIO;
var bc:int = SCREEN_WIDTH / BACKGROUND_BOX_SIZE + 1;
var bx:Number, by:Number;
var vby:Number = BACKGROUND_BOX_SIZE * Math.sin(roll);
var bh:Number, bby:Number;
for (var j:int = 0; j < 3; j++)
{
switch (j)
{
case 0:
{
bh = 8;
bby = 0;
break;
}
case 1:
{
bh = 16;
bby = 16;
break;
}
case 2:
{
bh = SCREEN_HEIGHT / 3;
bby = 48;
break;
}
}
bx = SCREEN_WIDTH / 2 - BACKGROUND_BOX_SIZE * bc / 2;
by = offset.y * zr + SCREEN_HEIGHT / 2 - vby * bc / 2 + bby + bh;
rect.width = BACKGROUND_BOX_SIZE;
rect.height = bh * 2;
for (var i:int = 0; i < bc; i++)
{
rect.x = bx - BACKGROUND_BOX_SIZE / 2;
rect.y = by - bh;
buffer.fillRect(rect, createColor(0x88 - j * 0x33, 0x88 - j * 0x33, 0xff, 255));
bx += BACKGROUND_BOX_SIZE;
by += vby;
}
}
}
private var roadPattern:Array = [20, 0, 0.2, 1, 16, 0, -3, 0, 16, 0, 3, 0, 80, 0.05, 0.05, 1, 90, 0, 0, 0, 80, -0.05, -1.0, 1, 20, 0, 1.75, 1];
private function createRoad():void
{
var r:Road = new Road;
var a:Number = 0;
var ud:Number = roadPattern[2];
r.angle = a;
r.upDown = ud;
var c:int;
var ta:Number, tud:Number;
var polePattern:int;
var i:int;
roadIndex = 0;
for (i = 0; i < roadPattern.length; i += 4)
{
c = roadPattern[i];
ta = roadPattern[i + 1];
tud = roadPattern[i + 2];
polePattern = roadPattern[i + 3];
for (var j:int = 0; j < c; j++)
{
a += (ta - a) * 0.2;
ud += (tud - ud) * 0.1;
r.angle += a;
r.angle = normalizeAngle(r.angle);
r.upDown = ud;
addRoadAndPole(r, polePattern);
r = getNextRoad(r);
}
}
c = Math.sqrt(r.pos.x * r.pos.x + r.pos.z * r.pos.z) / ROAD_SPACING;
var vrp:Vector3 = new Vector3;
vrp.x = -r.pos.x / c;
vrp.y = -r.pos.y / c;
vrp.z = -r.pos.z / c;
var va:Number = -r.angle / c;
var vud:Number = -r.upDown / c;
for (i = 0; i < c; i++)
{
addRoadAndPole(r, polePattern);
var nr:Road = new Road;
nr.pos.x = r.pos.x + vrp.x;
nr.pos.y = r.pos.y + vrp.y;
nr.pos.z = r.pos.z + vrp.z;
nr.angle = r.angle + va;
nr.upDown = r.upDown + vud;
r = nr;
}
}
private function addRoadAndPole(r:Road, polePattern:int):void
{
addRoadParticles(r);
roads.push(r);
if (polePattern > 0 && roadIndex % 7 == 0)
{
addPoleParticles(r);
}
roadIndex++;
}
private function getNextRoad(r:Road):Road
{
var nr:Road = new Road;
nr.pos.x = r.pos.x + Math.sin(r.angle) * ROAD_SPACING;
nr.pos.z = r.pos.z + Math.cos(r.angle) * ROAD_SPACING;
nr.pos.y = r.pos.y + Math.sin(r.upDown) * ROAD_SPACING;
nr.angle = r.angle;
nr.upDown = r.upDown;
return nr;
}
private function addRoadParticles(r:Road):void
{
for (var j:int = 0; j < 3; j++)
{
var p:Particle = new Particle;
var ox:Number = Math.cos(r.angle) * ROAD_WIDTH / 3 * 2;
var oz:Number = -Math.sin(r.angle) * ROAD_WIDTH / 3 * 2;
p.pos.x = r.pos.x + ox * (j - 1);
p.pos.y = r.pos.y;
p.pos.z = r.pos.z + oz * (j - 1);
p.width = ROAD_WIDTH / 3 * 1.05;
p.height = ROAD_HEIGHT;
p.detail = new Vector.<Particle>;
var pc:int = p.width / p.height + 2;
ox = Math.cos(r.angle) * p.width / pc * 2;
oz = -Math.sin(r.angle) * p.width / pc * 2;
var c:int = 0;
var i:int;
var pp:Particle;
for (i = 0; i < pc; i++)
{
pp = new Particle;
pp.pos.x = p.pos.x + ox * (i - pc / 2);
pp.pos.y = p.pos.y;
pp.pos.z = p.pos.z + oz * (i - pc / 2);
pp.width = pp.height = p.height;
pp.r = pp.g = pp.b = 190 + Math.random() * 30;
c += pp.r;
pp.detail = null;
p.detail.push(pp);
}
p.r = p.g = p.b = c / pc;
particles.push(p);
if (roadIndex % 3 == 0 && j != 1)
{
pp = new Particle;
pp.pos.x = p.pos.x + ox * pc / 2 * 1.2 * (j - 1);
pp.pos.y = p.pos.y - p.height * 0.5;
pp.pos.z = p.pos.z + oz * pc / 2 * 1.2 * (j - 1);
pp.width = p.height;
pp.height = p.height * 0.6;
pp.r = pp.g = pp.b = 32;
pp.detail = null;
particles.push(pp);
}
}
}
private function addPoleParticles(r:Road):void
{
for (var i:int = 0; i < 2; i++)
{
var p:Particle = new Particle;
p.width = 4;
p.height = 36;
p.pos.x = r.pos.x - Math.cos(r.angle) * ROAD_WIDTH * (i * 2 - 1) * 1.1;
p.pos.y = r.pos.y - p.height / 2;
p.pos.z = r.pos.z + Math.sin(r.angle) * ROAD_WIDTH * (i * 2 - 1) * 1.1;
p.r = 250; p.g = 60; p.b = 60;
p.detail = new Vector.<Particle>;
for (var j:int = 0; j < 8; j++)
{
var pp:Particle = new Particle;
pp.pos.x = p.pos.x;
pp.pos.y = p.pos.y - j * p.height / 8;
pp.pos.z = p.pos.z;
pp.width = p.width;
pp.height = p.height / 8;
pp.r = p.r;
pp.g = p.g;
pp.b = p.b;
pp.detail = null;
p.detail.push(pp);
}
particles.push(p);
}
}
private function normalizeAngle(v:Number):Number {
if (v > Math.PI)
return v - Math.PI * 2;
else if (v < -Math.PI)
return v + Math.PI * 2;
else
return v;
}
}
}
class Road
{
public var pos:Vector3 = new Vector3;
public var angle:Number, upDown:Number;
}
class Particle
{
public var pos:Vector3 = new Vector3;
public var width:Number;
public var height:Number;
public var r:int, g:int, b:int;
public var detail:Vector.<Particle>;
}
class DrawnParticle
{
public var pos:Vector3 = new Vector3;
public var width:Number;
public var height:Number;
public var color:int;
}
class Vector3
{
public var x:Number = 0;
public var y:Number = 0;
public var z:Number = 0;
public function rotationYaw(v:Number):void
{
var sv:Number = Math.sin(v);
var cv:Number = Math.cos(v);
var rx:Number = cv * x - sv * z;
z = sv * x + cv * z;
x = rx;
}
public function rotationPitch(v:Number):void
{
var sv:Number = Math.sin(v);
var cv:Number = Math.cos(v);
var ry:Number = cv * y - sv * z;
z = sv * y + cv * z;
y = ry;
}
public function rotationRoll(v:Number):void
{
var sv:Number = Math.sin(v);
var cv:Number = Math.cos(v);
var rx:Number = cv * x - sv * y;
y = sv * x + cv * y;
x = rx;
}
public function get length():Number
{
return Math.sqrt(x * x + y * y + z * z);
}
}
