iOS游戏应用源代码——dxjacob-OpenShooter-79275c1.zip

#include "GameState.h" using namespace std; const float ProjectileRemoveDistance = 50; const float ProjectileSpeed = 4; const float ProjectileRadius = 0.2; const float EnemeyRemoveDistance = -10; const float EnemySpawnTime = 10; const float EnemySpawnDistance = 30; const float EnemySpawnRange= 3; const float EnemySpeed = 0.5; const float EnemyRadius = 0.3; const float ViewRotationScale = 0.2; GameState::GameState() { playerDirection_ = 0; playerPosition_ = Point3(0,0,-5); totalTime_ = lastSpawnTime_ = 0; } void GameState::Shoot() { Vector3 direction(sin(playerDirection_), 0, cos(playerDirection_)); projectiles_.push_back(Projectile(playerPosition_, direction)); } void GameState::RotatePlayer(float angle) { playerDirection_ = -angle * ViewRotationScale; } void GameState::Update(float dt) { totalTime_ += dt; UpdateProjectiles(dt); UpdateEnemies(dt); SpawnEnemies(); HandleCollision(); } void GameState::UpdateProjectiles(float dt) { vector<Projectile>::iterator it; for (it = projectiles_.begin(); it != projectiles_.end();) { Point3& position = it->position; // update position position += ProjectileSpeed*dt*it->direction; // remove if (position.getZ() > ProjectileRemoveDistance) projectiles_.erase(it); else it++; } } void GameState::UpdateEnemies(float dt) { vector<Point3>::iterator it; for (it = enemies_.begin(); it != enemies_.end();) { Point3& position = *it; // update position position -= Vector3(0,0,EnemySpeed*dt); // remove if (position.getZ() < EnemeyRemoveDistance) enemies_.erase(it); else it++; } } void GameState::SpawnEnemies() { if (totalTime_ - lastSpawnTime_ > EnemySpawnTime) { lastSpawnTime_ = totalTime_; float x = (rand()/(float)RAND_MAX - 0.5) * EnemySpawnRange; enemies_.push_back(Point3(x, 0, EnemySpawnDistance)); } } bool didSpheresCollide(Point3 pointA, float radiusA, Point3 pointB, float radiusB) { float distanceSquared = distSqr(pointA, pointB); float radius = radiusA + radiusB; return distanceSquared < radius * radius; } void GameState::HandleCollision() { vector<Point3>::iterator enemyIterator; for (enemyIterator = enemies_.begin(); enemyIterator != enemies_.end();) { bool collision = false; vector<Projectile>::iterator projectileIterator; for(projectileIterator = projectiles_.begin(); projectileIterator != projectiles_.end(); ) { collision = didSpheresCollide(projectileIterator->position, ProjectileRadius, *enemyIterator, EnemyRadius); // remove projectile if (collision) { projectiles_.erase(projectileIterator); break; } else projectileIterator++; } // remove enemy if (collision) enemies_.erase(enemyIterator); else enemyIterator++; } }