PlanetFleet/shell.cpp

#include <model.h>

#include "shell.h"
#include "defConfigs.h"
#include "projectileData.h"
#include "util.h"
#include "unit.h"

using namespace game::core;
using namespace game::util;
using namespace vb01;

namespace game{
    namespace content{
        Shell::Shell(Unit *unit, Vector3 pos, Vector3 dir, Vector3 left, Vector3 up, int id, int weaponTypeId, int weaponId) : Projectile(unit, nullptr, pos, dir, left, up, id, weaponTypeId, weaponId) {
            this->speed = projectileData::speed[id][weaponTypeId][weaponId];
            node->setScale(Vector3(1, 1, 1) * projectileData::scale[id][weaponTypeId][weaponId]);
            initTime = getTime();
        }

        void Shell::update() {
            //x=v*cos(a)*t
            //y=v*sin(a)*t+0.5(g*t^2)
            Projectile::update();
            Vector3 straightVec = Vector3(dirVec.x, 0, dirVec.z).norm();
            double time = double(getTime() - initTime) / 1000,
                offsetX = speed * cos(angle) * time,
                offsetY = speed * sin(angle) * time - .5 * (g * time * time);
            pos = initPos + straightVec * offsetX + Vector3(0, offsetY, 0);
            node->setPosition(pos);
            updateVecs(straightVec, time);
            checkForCollision();
        }

        void Shell::updateVecs(Vector3 straightVec, float time) {
            // f'(t)=dy/dx=(v*sin(a)+g*t)/(v*cos(a))
            float tanAngle = -atan((speed * sin(angle) + g * time) / (speed * cos(angle)));
            Quaternion rotQuat = Quaternion(tanAngle, leftVec);
            dirVec = rotQuat*straightVec, upVec = rotQuat * Vector3(0, 1, 0);
						/*
            Vector3 rotVec = node->getOrientation();
            rotVec=vector3df(tanAngle/PI*180,rotVec.Y,rotVec.Z);
            node->setRotation(rotVec);
						*/
        }
    }
}