TowerGame/enemy.cpp at master · linna21/TowerGame · GitHub

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#include "enemy.h"
#include "waypoint.h"
#include "plant.h"
#include "window1.h"
#include "utitle.h"
#include <QPainter>
#include <QColor>
#include <QDebug>
#include <QMatrix>
#include <QVector2D>
#include <QtMath>


const QSize Enemy::ms_fixedSize(60, 52);

Enemy::Enemy(WayPoint *startWayPoint, Window1 *game, const QPixmap &sprite)
    : QObject(0)
    , m_active(false)
    , m_maxHp(40)
    , m_currentHp(40)
    , m_walkingSpeed(1.0)
    , m_rotationSprite(0.0)
    , m_pos(startWayPoint->pos())
    , m_destinationWayPoint(startWayPoint->nextWayPoint())
    , m_game(game)
    , m_sprite(sprite)
{
}


void Enemy::doActivate()
{
    m_active = true;
}

void Enemy::move()
{
    if (!m_active)
        return;

    if (collisionWithCircle(m_pos, 1, m_destinationWayPoint->pos(), 1))
    {
        // 敌人抵达了一个航点
        if (m_destinationWayPoint->nextWayPoint())
        {
            // 还有下一个航点
            m_pos = m_destinationWayPoint->pos();
            m_destinationWayPoint = m_destinationWayPoint->nextWayPoint();
        }
        else
        {
            // 表示进入基地
            m_game->getHpDamage();
            m_game->removedEnemy(this);
            return;
        }
    }

    // 还在前往航点的路上
    // 目标航点的坐标
    QPoint targetPoint = m_destinationWayPoint->pos();
    // 未来修改这个可以添加移动状态,加快,减慢,m_walkingSpeed是基准值

    // 向量标准化
    qreal movementSpeed = m_walkingSpeed;
    QVector2D normalized(targetPoint - m_pos);
    normalized.normalize();
    m_pos = m_pos + normalized.toPoint() * movementSpeed;

    // 确定敌人选择方向
    // 默认图片向左,需要修正180度转右
     //m_rotationSprite = qRadiansToDegrees(qAtan2(normalized.y(), normalized.x())) + 90;
}

void Enemy::draw(QPainter *painter) const
{
    if (!m_active)
      return;
    // 血条的长度
    // 2个方框,红色方框表示总生命,固定大小不变
    // 绿色方框表示当前生命,受m_currentHp / m_maxHp的变化影响
    static const int Health_Bar_Width = 50;
    painter->save();
    QPoint healthBarPoint = m_pos + QPoint(-Health_Bar_Width / 2, -ms_fixedSize.height() );
    // 绘制血条
    painter->setPen(Qt::NoPen);
    painter->setBrush(QColor(255,99,71));
    QRect healthBarBackRect(healthBarPoint, QSize(Health_Bar_Width, 5));
    painter->drawRect(healthBarBackRect);

    painter->setBrush(QColor(255,245,238));
    QRect healthBarRect(healthBarPoint, QSize((double)m_currentHp / m_maxHp * Health_Bar_Width, 5));
    painter->drawRect(healthBarRect);

    // 绘制偏转坐标,由中心+偏移=左上
    static const QPoint offsetPoint(-ms_fixedSize.width()*1.5 , -ms_fixedSize.height() );
    painter->translate(m_pos);
    painter->rotate(m_rotationSprite);
    // 绘制敌人
    painter->drawPixmap(offsetPoint, m_sprite);

    painter->restore();
}