u0u0's Offical Site

需要对象挂有Collider组件才能计算射线，某些情况下不适用。

if (Input.GetMouseButtonDown(0))
{
    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition); //从摄像机发出到点击坐标的射线
    RaycastHit hit;
    if (Physics.Raycast(ray, out hit)) //需要有Collider组件才能碰撞到
    {
        Debug.Log(hit.point);//碰撞坐标
    }
}

参考
https://blog.csdn.net/abcjennifer/article/details/6688080

public static class MyUtils
{
    /*
     * 求一条直线与平面的交点
     * [param] planeVector, 平面的法线向量.
     * [param] planePoint, 平面经过的一点坐标.
     * [param] lineVector, 直线的方向向量.
     * [param] linePoint, 直线经过的一点坐标.
     * [returns] 是否想交, rtn 是交点坐标.
     */
    public static bool PlaneLineIntersectPoint(ref Vector3 planeVector, ref Vector3 planePoint, ref Vector3 lineVector, ref Vector3 linePoint, out Vector3 rtn)
    {
        float vp1, vp2, vp3, n1, n2, n3, v1, v2, v3, m1, m2, m3, t, vpt;
        vp1 = planeVector.x;
        vp2 = planeVector.y;
        vp3 = planeVector.z;
        n1 = planePoint.x;
        n2 = planePoint.y;
        n3 = planePoint.z;
        v1 = lineVector.x;
        v2 = lineVector.y;
        v3 = lineVector.z;
        m1 = linePoint.x;
        m2 = linePoint.y;
        m3 = linePoint.z;

        vpt = v1 * vp1 + v2 * vp2 + v3 * vp3; //点乘
        //首先判断直线是否与平面平行(正确的浮点判断0方式)
        if (Math.Abs(vpt) <= 0.000001f)
        {
            rtn.x = rtn.y = rtn.z = 0;
            return false;
        }

        t = ((n1 - m1) * vp1 + (n2 - m2) * vp2 + (n3 - m3) * vp3) / vpt;
        rtn.x = m1 + v1 * t;
        rtn.y = m2 + v2 * t;
        rtn.z = m3 + v3 * t;
        return true;
    }
}

display.newSprite("hideback.png"):addTo(self):center()

local render = cc.RenderTexture:create(display.width, display.height):center():addTo(self)
local sp = cc.Sprite:create("HelloWorld.png"):center()

render:begin()
sp:visit()
render:endToLua()

local circle = display.newSolidCircle(20,{color = cc.c4f(0.5, 0.5, 0.5, 0)})
circle:retain()
circle:setBlendFunc(cc.blendFunc(cc.backendBlendFactor.SRC_ALPHA, cc.backendBlendFactor.ZERO))

self:addNodeEventListener(cc.NODE_TOUCH_EVENT,function ( event )
    if event.name == "began" then
        return true
    end

    if event.name == "moved" then
        circle:pos(event.x,event.y)
        render:begin()
        circle:visit()
        render:endToLua()
    end
end)
self:setTouchEnabled(true)

Asset store 免费下载。

http://www.pixelplacement.com/itween/documentation.php

用来实现类似cocos中action系统类似的编程动作。

移动

iTween.MoveTo(gameObject, iTween.Hash("x", trackPosXs[curTrack], //移动x位置
    "easeType", "easeInOutExpo", //移动方式
    "loopType", "none", // 不循环
    "delay", 0)); // 延迟

unsigned int length = pointsArray.size(); // XXX
cocos2d::Vec2 *points = new cocos2d::Vec2[length];//XXX
int cnt = 0;// XXX
for (auto& p : pointsArray) {
    ValueMap &a = p.asValueMap();
    Vec2 *th = &points[cnt];//xxx
    th->x = a["x"].asFloat();//xxx
    th->y = a["y"].asFloat();//xxx
    cnt++;//xxx
}
DrawNode *node = DrawNode::create();
node->drawPoly(points, length, true, Color4F(1, 0, 0, 1));
addChild(node);
node->setPosition(xPos);
float rotation = 0;
if (dict.find("rotation") != dict.end()) {
    rotation = dict["rotation"].asFloat();
}
node->setRotation(rotation);
// set data for sort
Vec2 *data = new Vec2(xPos);
node->setUserData((void *)data);

系统教程 https://tkdocs.com/tutorial/

tk 原始文档： http://www.tcl.tk/man/tcl8.6/TkCmd/contents.htm

python 源码：https://github.com/python/cpython/tree/3.8/Lib/tkinter

部分旧API参考：http://effbot.org/tkinterbook/

int family = iterator->ai_family;
t_socket sock;
const char *err = inet_trycreate(&sock, family, SOCK_STREAM);
if (err) {
    continue; // check next
} else {
    t_timeout tm;
    struct addrinfo connecthints;
    memset(&connecthints, 0, sizeof(connecthints));
    connecthints.ai_socktype = SOCK_STREAM;
    /* make sure we try to connect only to the same family */
    connecthints.ai_family = family;
    
    if (family == PF_INET6) {
        int yes = 1;
        setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&yes, sizeof(yes));
    }
    timeout_markstart(&tm);
    err = inet_tryconnect(&sock, &family, (const char *)hbuf, "3006", &tm, &connecthints);
    if (err) {
        socket_destroy(&sock);
        continue; // check next
    } else {
        // find success one
        CCLOG("== xx:%s", hbuf);
    }
}

编译png

$cmake .. -DPNG_STATIC=ON -DZLIB_INCLUDE_DIR=/home/u0u0/works/Cocos2d-thirdpart/tarballs/zlib-1.2.8/ -DZLIB_LIBRARY=/home/u0u0/works/Cocos2d-thirdpart/tarballs/zlib-1.2.8/

编译websockets

$cmake .. -DOPENSSL_ROOT_DIR=/home/u0u0/works/Cocos2d-thirdpart/tarballs/openssl-1.1.0c -DZLIB_INCLUDE_DIR=/home/u0u0/works/Cocos2d-thirdpart/tarballs/zlib-1.2.8/ -DZLIB_LIBRARY=/home/u0u0/works/Cocos2d-thirdpart/tarballs/zlib-1.2.8/ -DLWS_WITH_LIBUV=OFF -DLWS_WITH_SSL=ON -DLWS_WITH_SHARED=OFF -DLWS_WITHOUT_TEST_SERVER=ON -DLWS_WITHOUT_TEST_SERVER_EXTPOLL=ON -DLWS_WITHOUT_TEST_PING=ON -DLWS_WITHOUT_TEST_ECHO=ON -DLWS_WITHOUT_TEST_CLIENT=ON -DLWS_WITHOUT_TEST_FRAGGLE=ON -DLWS_IPV6=ON

编译OpenSSL

在 Linux 下自定义OpenSSL库，需要安装到一个路径，以便curl能找到。

./config --prefix=/home/u0u0/works/projects/Cocos2d-thirdpart/tarballs/openssl_install --openssldir=/home/u0u0/works/projects/Cocos2d-thirdpart/tarballs/openssl_install
make
make install

编译curl

./configure --enable-static --disable-ldap --enable-ipv6 --with-zlib=/home/u0u0/works/Cocos2d-thirdpart/tarballs/zlib-1.2.8/ --with-ssl=/home/u0u0/works/projects/Cocos2d-thirdpart/tarballs/openssl_install --prefix=/home/u0u0/works/projects/Cocos2d-thirdpart/tarballs/curl_install
make
make install

编译OpenAL

$sudo apt-get install libasound2-dev
$cmake .. -DLIBTYPE=STATIC -DALSOFT_INSTALL=OFF -DALSOFT_REQUIRE_ALSA=ON

sudo apt install flashplugin-installer

http://exmplayer.sourceforge.net/downloads.html

#Ubuntu 20.04 
sudo add-apt-repository ppa:exmplayer-dev/exmplayer-qt5
#old
sudo add-apt-repository ppa:exmplayer-dev/exmplayer
sudo apt-get update
sudo apt-get install exmplayer