ekku@197: #include "Player.hh"
ekku@197: #include "PhysicsObject.hh"
ekku@197: #include "Engine.hh"
ekku@197: 
ekku@197: #include <cmath>
ekku@197: 
ekku@197: PhysicsObject::PhysicsObject (PhysicsWorld &world, float mass, 
ekku@197:                               Vector position, Vector velocity)
ekku@197:     : world(world), position(position), velocity(velocity),
ekku@197:       mass(mass), inAir(true), aim(0), facingRight(true), reloadTimer(0) {
ekku@197:     // TODO: Is thir the right way to do this?
ekku@197:     //world.addPlayerObject(this);
ekku@197: }
ekku@197: 
ekku@197: /**
ekku@197:  * Player walks on floor.
ekku@197:  */
ekku@197: Vector PhysicsObject::walk_one_step (float partial, bool right) {
ekku@197:     // which way we are walking
ekku@197:     float deltaX = right ? partial : -partial;
ekku@197:     Vector reached = this->position;
ekku@197:     if(reached.roundToInt() == (reached+Vector(deltaX, 0)).roundToInt()) {
ekku@197:         return reached+Vector(deltaX, 0);
ekku@197:     }
ekku@197:     // Is there upward ramp
ekku@197:     if(!possibleLocation(position+Vector(deltaX, 0))) {
ekku@197:         // Yes. Then we check n pixels up
ekku@197:         for(int i = 1; i < 3; i++) {
ekku@197:             if(possibleLocation(position+Vector(deltaX, -i))) {
ekku@197:                 // and when there is finally EMPTY, we can walk
ekku@197:                 reached = position+Vector(deltaX, -i);
ekku@197:                 break;
ekku@197:             }
ekku@197:         }
ekku@197:     } else {
ekku@197:         // Or downward ramp or flat
ekku@197:         for(int i = 0; 1; i++) {
ekku@197: 
ekku@197:             // And when there is finally ground we can step on
ekku@197:             // it. If there is no gound we still step there,
ekku@197:             // but will fall one pixel down
ekku@197:             if(possibleLocation(position+Vector(deltaX, i))) {
ekku@197:                 reached = position+Vector(deltaX, i);
ekku@197:             } else {
ekku@197:                 break;
ekku@197:             }
ekku@197:             
ekku@197:             // If the fall is big enough, set the worm in the air
ekku@197:             if (i >= 2) {
ekku@197: //                Vector back = walk(dt, !right);
ekku@197:                 this->inAir = true;
ekku@197: //                this->velocity.x = right ? velocity : -velocity;
ekku@197:                 // Avoid stepping two pixels down when it starts to free fall
ekku@197:                 reached.y -= 2;
ekku@197: //                this->velocity = (reached-back)*1000/dt;
ekku@197:                 break;
ekku@197:             }
ekku@197:         }
ekku@197:     }
ekku@197:     // And we return where we got
ekku@197:     return reached;
ekku@197: }
ekku@197: void PhysicsObject::walk (TimeMS dt, bool right) {
ekku@197:     float velocity = PLAYER_WALK_SPEED;
ekku@197:     float walkAmount = (velocity*dt)/1000;
ekku@197:     Vector reached = this->position;
ekku@197:     while(walkAmount > 0 && !this->inAir) {
ekku@197:         this->position = walk_one_step((1 < walkAmount ? 1 : walkAmount), right);
ekku@197:         walkAmount--;
ekku@197:     }
ekku@197:     // TODO: Should the remaining walkAmount be handled somehow?
ekku@197: }
ekku@197: 
ekku@197: /**
ekku@197:  * Makes the player jump in the air.
ekku@197:  * @param direction -1: jump left, 0: jump up, 1: jump right
ekku@197:  */
ekku@197: void PhysicsObject::jump (int direction) {
ekku@197:     // Jump only if player is "on the ground"
ekku@197:     if (!this->inAir) {
ekku@197:  	    velocity.y = -100;
ekku@197:         switch (direction) {
ekku@197:             case 1:
ekku@197:                 velocity.x += 20;
ekku@197:                 break;
ekku@197:             case -1:
ekku@197:                 velocity.x -= 20;
ekku@197:                 break;
ekku@197:             case 0:
ekku@197:                 break;
ekku@197:             default:
ekku@197:                 throw std::logic_error("Invalid jump direction");
ekku@197:         }
ekku@197: 	    inAir = true;
ekku@197:     }
ekku@197: }
ekku@197: 
ekku@197: bool PhysicsObject::possibleLocation (Vector loc) {
ekku@197:     for(unsigned int i = 0; i < this->shape.size(); i++) {
ekku@197:         if(world.collides(loc+shape[i]))
ekku@197:             return false;
ekku@197:     }
ekku@197:     return true;
ekku@197: }
ekku@197: 
ekku@197: void func1() {
ekku@197: 
ekku@197: }
ekku@197: 
ekku@197: /**
ekku@197:  * Updates object speed and position. This function organises force
ekku@197:  * integration and collision detection.
ekku@197:  */   
terom@205: void PhysicsObject::updatePosition (TimeMS dt) {
ekku@197: 
ekku@197:     // Reloads weapon if not reloaded
terom@205:     reloadTimer -= dt;
ekku@197:     if(reloadTimer < 0)
ekku@197:         reloadTimer = 0;
ekku@197: 
ekku@197:     // Add gravity to the force queue
ekku@197:     forceq.push(world.gravity);
ekku@197:     
ekku@197:     // Go trough every force in the queue
ekku@197:     Force total;
ekku@197:     while (!forceq.empty()) {
ekku@197:         total += forceq.front();
ekku@197:         forceq.pop();
ekku@197:     }
ekku@197: 
ekku@197:     // If the player has stopped and there's some ground under some of the 3 some of the 3t
ekku@197:     // set inAir false
ekku@197:     if (this->velocity == Vector(0,0)) {
ekku@197:         this->inAir = !world.collides(this->position+shape[1]+Vector(0, 1))
ekku@197:                       && !world.collides(this->position+shape[2]+Vector(0, 1))
ekku@197:                       && !world.collides(this->position+shape[3]+Vector(0, 1));
ekku@197:         // If, however, there's a force caused by a bomb, e.g., set it in air.
ekku@197:         // Still, we have to be able to separate forces caused by walking attempts
ekku@197:         // and bombs etc (+0.1 because float comparison can be dangerous)
ekku@197:         if (total.y < 0 || abs(total.x) > PLAYER_MOVE_FORCE + 0.1)
ekku@197:             this->inAir = true;
ekku@197:     }
ekku@197: 
ekku@197:     if(!possibleLocation(position)) {
ekku@197:         //if we are trapped in ground form dirtball or something
ekku@197:         //we might want to just return and set velocity to some value
ekku@197:         //return;
ekku@197:     }
ekku@197: 
ekku@197:     // If the worm is not in the air make it walk,
ekku@197:     // otherwise integrate the new position and velocity
ekku@197:     if (!this->inAir) {
ekku@197:         //std::cout << "Tryin to walk" << std::endl;
ekku@197:         // It walks only if there's some vertical force
ekku@197:         if (total.x != 0) {
ekku@197:             std::cout << "Succeeding to walk" << std::endl;
terom@205:             walk(dt, total.x > 0);
ekku@197:             this->velocity = Vector(0,0);
ekku@197:         }
ekku@197:     }
ekku@197: 
ekku@197:     if(!possibleLocation(position)) {
ekku@197:         Engine::log(DEBUG, "great failure") << "great failure";
ekku@197:         func1();
ekku@197:     }
ekku@197:     Vector newPosition;
ekku@197:     Vector velAfterTick;
ekku@197:     // Calculate new position and velocity to the given references
terom@205:     integrate(total, dt, newPosition, velAfterTick);
ekku@197:     this->velocity = velAfterTick;
ekku@197: 
ekku@197:    
ekku@197:     // Collision detection
ekku@197:     bool collided = false;
ekku@197:    
ekku@197:     const Vector diffVec = newPosition-position;
ekku@197:     const Vector unitVector = diffVec / diffVec.length();
ekku@197:     Vector reached = position;
ekku@197: 
ekku@197:     while ((position-reached).sqrLength() < diffVec.sqrLength()) {
ekku@197:         reached += unitVector;
ekku@197:         // Check if any of the shapes points collide
ekku@197:         for (uint64_t i = 0; i < shape.size(); i++) {
ekku@197:             if (world.collides(reached+shape[i])) {  // Collision
ekku@197:                 if (inAir) {
ekku@197:                     //                    Engine::log(DEBUG, "Here");
ekku@197:                     this->bounce(world.getNormal(reached+shape[i], 
ekku@197:                                                  reached-unitVector+shape[i]));
ekku@197:                     //this->velocity *= COLLISION_ELASTICITY;
ekku@197:                 }
ekku@197:                 reached = reached - unitVector; // Return to last point
ekku@197:                 collided = true;
ekku@197:                 if (this->velocity.sqrLength() < PLAYER_MIN_SPEED * PLAYER_MIN_SPEED) {
ekku@197:                     this->velocity = Vector(0,0);
ekku@197:                 }
ekku@197:                 break;
ekku@197:             }
ekku@197:         }
ekku@197:         if (collided)
ekku@197:             break;
ekku@197: //        reached += unitVector;
ekku@197:     }
ekku@197:    
ekku@197:     
ekku@197:     if(!possibleLocation(reached)) {
nireco@211:         Engine::log(DEBUG, "PhysicsObject.updatePosition") << "inside ground. diffVec: " << diffVec;
ekku@197:         func1();
ekku@197:     }
ekku@197: 
ekku@197:     // In case of some float error check the final coordinate
ekku@197:     if(!collided) {
ekku@197:         if(!possibleLocation(newPosition)) {
ekku@197:             newPosition = reached;
ekku@197:         } else {
ekku@197:             // This means everything was ok, so no need to do anything
ekku@197:         }
ekku@197:     } else {
ekku@197:         newPosition = reached;
nireco@211:         this->position = newPosition;
ekku@197:         onCollision();
nireco@210:         //TODO: It should be moved before onCollision, for Shots
ekku@197:     }
ekku@197:     this->position = newPosition;
ekku@197: //    Engine::log(DEBUG, "PhysicsObject.updatePosition") << "Pos: " << this->position;
ekku@197: }
ekku@197: 
ekku@197: /**
ekku@197:  * Bounces from straight wall in any direction.
ekku@197:  * Direction given as normal of that wall
ekku@197:  */
ekku@197: void PhysicsObject::bounce (Vector normal) {
ekku@197:     // normal.sqrLength can't be 0 when got from getNormal()
ekku@197:     if (normal.sqrLength() != 0) {
ekku@197:         Vector nvel = velocity;
ekku@197:         // We project the velocity on normal and remove twice that much from velocity
ekku@197:         nvel = nvel - ((2)*((nvel*normal)/(normal*normal))*normal);
ekku@197:         velocity = nvel;
ekku@197:         // We lose some of our speed on collision
ekku@197:         this->velocity *= this->collision_elasticity;
ekku@197:     }
ekku@197: }
ekku@197: 
ekku@197: /**
ekku@197:  * Integrates given force over time and stores new position to
ekku@197:  * posAfterTick and new velocity to velAfterTick.
ekku@197:  * @param force Force vector.
ekku@197:  * @param dt The time the force is applied (<=PHYSICS_TICK_MS)
ekku@197:  */
ekku@197: void PhysicsObject::integrate(Force force, TimeMS dt, Vector &posAfterTick, Vector &velAfterTick) {
ekku@197:     posAfterTick = position;
ekku@197:     velAfterTick = velocity;
ekku@197:     Derivative tmpd;
ekku@197:     Derivative k1 = evaluate(force, 0, tmpd, posAfterTick, velAfterTick);
ekku@197:     Derivative k2 = evaluate(force, 0.5f*dt, k1, posAfterTick, velAfterTick);
ekku@197:     Derivative k3 = evaluate(force, 0.5f*dt, k2, posAfterTick, velAfterTick);
ekku@197:     Derivative k4 = evaluate(force, dt, k3, posAfterTick, velAfterTick);
ekku@197:     
ekku@197: 
ekku@197:     const Vector dxdt = (k1.dx + (k2.dx + k3.dx) * 2.0f + k4.dx) * 1.0f/6.0f;
ekku@197:     const Vector dvdt = (k1.dv + (k2.dv + k3.dv) * 2.0f + k4.dv) * 1.0f/6.0f;
ekku@197:     
ekku@197:     //    Engine::log(DEBUG, "PhysicsObject.integrate") << "Changes: "<< dxdt << " " << dvdt << " Time: " <<dt;
ekku@197:     posAfterTick = posAfterTick + (dxdt * dt)/1000;
ekku@197:     velAfterTick = velAfterTick + (dvdt * dt)/1000;
ekku@197:     //Engine::log(DEBUG, "PhysicsObject.integrate") << "velAfterTick: " << velAfterTick;
ekku@197: }
ekku@197: 
ekku@197: Derivative PhysicsObject::evaluate(Force force, TimeMS dt, Derivative &d, const Vector &posAfterTick, const Vector &velAfterTick) {
ekku@197:     Vector curPos = posAfterTick + (d.dx*dt)/1000;
ekku@197:     Vector curVel = velAfterTick + (d.dv*dt)/1000;
ekku@197: 
ekku@197:     Derivative out;
ekku@197:     out.dx = curVel;
ekku@197:     out.dv = acceleration(force);
ekku@197:     //Engine::log(DEBUG, "PhysicsObject.evaluate") << "Out.dx: " << out.dx;
ekku@197:     return out;
ekku@197: }
ekku@197: 
ekku@197: Vector PhysicsObject::acceleration(const Force &force) {
ekku@197:     return (force/mass);
ekku@197: }
ekku@197: 
ekku@197: void PhysicsObject::applyForce (Force force) {
ekku@197:     // Add applied force to the queue
ekku@197:     forceq.push(force);
ekku@197: }
ekku@197: 
ekku@197: void PhysicsObject::changeAim(float da) {
ekku@197:     this->aim += da;
ekku@197: 
ekku@197:     if (this->aim > PLAYER_AIM_MAX) this->aim = PLAYER_AIM_MAX;
ekku@197:     if (this->aim < PLAYER_AIM_MIN) this->aim = PLAYER_AIM_MIN;
ekku@197:     //Engine::log(DEBUG, "PhysicsObject.changeAim") << "Player aim: " << this->aim;
ekku@197: }
ekku@197: 
ekku@197: void PhysicsObject::setFacing(bool facingRight) {
ekku@197:     //Engine::log(DEBUG, "PhysicsObject.setFacing") << "Facing: " << right;
ekku@197:     this->facingRight = facingRight;
ekku@197: }
ekku@197: 
terom@200: void PhysicsObject::updatePhysics (Vector position, Vector velocity, bool inAir, bool facingRight, float aim) {
ekku@197:     this->position = position;
ekku@197:     this->velocity = velocity;
ekku@197:     this->inAir = inAir;
terom@200:     this->facingRight = facingRight;
terom@200:     this->aim = aim;
ekku@197: }
terom@200:    
ekku@197: Vector PhysicsObject::getPosition () {
ekku@197:     return this->position;
ekku@197: }
ekku@197: 
ekku@197: bool PhysicsObject::getFacing() {
ekku@197:     return this->facingRight;
ekku@197: }
ekku@197: 
ekku@197: float PhysicsObject::getAim() {
ekku@197:     return this->aim;
ekku@197: }
ekku@197: 
ekku@197: std::vector<Vector>& PhysicsObject::getShape () {
ekku@197:     return this->shape;
ekku@197: }
ekku@197: 
ekku@197: void PhysicsObject::setShape (std::vector<Vector> shape) {
ekku@197:     this->shape = shape;
ekku@197: }
ekku@197: 
terom@205: void PhysicsObject::tick (TimeMS tick_length) {
terom@205:     this->updatePosition(tick_length);
ekku@197: }
ekku@197: 
ekku@197: bool PhysicsObject::canShoot() {
ekku@197:     return this->reloadTimer <= 0;
ekku@197: }
ekku@197: 
ekku@197: void PhysicsObject::draw(CL_GraphicContext *gc) {
ekku@197:     CL_Quad player(
ekku@197:                    (position+shape[0]).x, (position+shape[0]).y,
ekku@197:                    (position+shape[1]).x, (position+shape[1]).y,
ekku@197:                    (position+shape[2]).x, (position+shape[2]).y,
ekku@197:                    (position+shape[3]).x, (position+shape[3]).y
ekku@197:                    );
ekku@197:     
ekku@197:     gc->fill_quad(player, CL_Color::green);
ekku@197:     
ekku@197:     const uint16_t chlen = 10;
ekku@197:     uint16_t x = player.center().x;
ekku@197:     uint16_t y = player.center().y;
ekku@197:     if (facingRight) {
ekku@197:         gc->draw_line(x, y,
ekku@197:                       x + std::cos(aim)*chlen,
ekku@197:                       y - std::sin(aim)*chlen,
ekku@197:                       CL_Color::black);
ekku@197:     } else {
ekku@197:         gc->draw_line(x, y,
ekku@197:                       x - std::cos(aim)*chlen,
ekku@197:                       y - std::sin(aim)*chlen,
ekku@197:                       CL_Color::black);
ekku@197:     }
ekku@197: }
ekku@197: