win7正版系统,湖北省国家税务局,win7桌面
可能很多初学者如果想知道ue4的这种伤害系统如何使用起来会有点迷茫。
我自己做了demo给大家参考下。
首先要有个子弹类。
.h代码如下
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1 uclass()
2 class snvrclayshooting_api aprojectile : public aactor
3 {
4 generated_body()
5
6 public:
7 // sets default values for this actor's properties
8 aprojectile();
9
10 uproperty(visibleanywhere, blueprintreadwrite, category = "projectile")
11 ustaticmeshcomponent* projectilemesh;
12
13 uproperty(visibleanywhere, blueprintreadwrite, category = "projectile")
14 uparticlesystemcomponent* launchparticle; //烟火，开枪时
15
16 uproperty(visibleanywhere, blueprintreadwrite, category = "projectile")
17 uprojectilemovementcomponent *projectilemovementcomponent = nullptr;
18
19 protected:
20 // called when the game starts or when spawned
21 virtual void beginplay() override;
22
23 ufunction()
24 void onhit(uprimitivecomponent* hitcomponent, aactor* otheractor, uprimitivecomponent* othercomp, fvector normalimpulse, const fhitresult& hit);
25
26 public:
27 // called every frame
28 virtual void tick(float deltatime) override;
29
30 ufunction(blueprintcallable, category = "projectile_fun")
31 void launchprojectile(fvector speed);
32
33 };
.cpp代码如下
1 aprojectile::aprojectile()
2 {
3 // set this actor to call tick() every frame. you can turn this off to improve performance if you don't need it.
4 primaryactortick.bcanevertick = true;
5
6 projectilemovementcomponent = createdefaultsubobject<uprojectilemovementcomponent>(fname("projectilemovement")); //生成组件
7 projectilemovementcomponent->bautoactivate = false; //自动飞行调成false
8
9 projectilemesh = createdefaultsubobject<ustaticmeshcomponent>(fname("projectilemesh"));
10 rootcomponent = projectilemesh;
11 projectilemesh->setnotifyrigidbodycollision(true);
12 projectilemesh->setvisibility(true);
13
14 launchparticle = createdefaultsubobject<uparticlesystemcomponent>(fname("launchparticle"));
15 launchparticle->setupattachment(projectilemesh); //将粒子效果绑定在根结点上（即projectilemesh）
16 launchparticle->setautoactivate(true); //创建好就启动
17
18 projectilemesh->oncomponenthit.adddynamic(this, &aprojectile::onhit);
19
20 initiallifespan = 5.0f;
21 }
22
23 // called when the game starts or when spawned
24 void aprojectile::beginplay()
25 {
26 super::beginplay();
27
28 }
29
30 // called every frame
31 void aprojectile::tick(float deltatime)
32 {
33 super::tick(deltatime);
34
35 }
36 void aprojectile::launchprojectile(fvector speed)
37 {
38 projectilemovementcomponent->setvelocityinlocalspace(speed);
39 projectilemovementcomponent->activate(); //可以飞行了
40 }
41 //碰撞后发生的事件
42 void aprojectile::onhit(uprimitivecomponent* hitcomponent, aactor* otheractor, uprimitivecomponent* othercomp, fvector normalimpulse, const fhitresult& hit)
43 {
44 ue_log(logtemp, warning, text("aprojectile::onhit--otheractor.name=%s"),*otheractor->getname()); //撞击后给个提示
45
46 projectilemesh->setnotifyrigidbodycollision(false); //碰撞之后再也不发生碰撞事件
47 //collisionmesh->destroycomponent(); //不是destroyactor，component是单一一个
48
49 //受伤害源otheractor的takedamage()会被调用
50 ugameplaystatics::applypointdamage(otheractor, 10.0f, getactorlocation(), hit,null,null, udamagetype::staticclass());
51
52 destroy();
53 }
伤害的入口从onhit看出，调用了ugameplaystatics::applypointdamage；
第一个参数就是受伤害源，ue4的伤害系统会调用受伤害源的takedamege接口；
此时子弹有了伤害力，那么受伤害源就要被伤害；
每个actor都有这个接口virtual float takedamage(float damageamount, struct fdamageevent const& damageevent, class acontroller* eventinstigator, aactor* damagecauser);
只要重写这个接口，写上自己的处理逻辑。
受伤害源部分代码如下：
1 float adamagedactor::takedamage(float damageamount, struct fdamageevent const& damageevent, class acontroller* eventinstigator, aactor* damagecauser)
2 {
3 float actuallyapplied = 0.0f;
4
5 maxhp -= damageamount;
6
7 ue_log(logtemp,warning,text("adamagedactor::takedamage--maxhp=%f"),maxhp);
8
9 actuallyapplied = fmath::clamp<float>(maxhp, 0.0f, 100.0f);
10
11 return actuallyapplied;
12 }
以上就是简单的使用ue4的伤害系统。
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