objective c - how to change the alpha of a groundoverlay in google maps ios sdk? -


i added groundoverlay mapview, , found thoese ways change alpha of groundoverlay.icon. how set opacity/alpha of uiimage? seems has no affect in app, still can not see map or other groundoverlays behind image. there solution handle this?

+ (uiimage *) setimage:(uiimage *)image withalpha:(cgfloat)alpha

{

// create pixel buffer in easy use format cgimageref imageref = [image cgimage]; nsuinteger width = cgimagegetwidth(imageref); nsuinteger height = cgimagegetheight(imageref); cgcolorspaceref colorspace = cgcolorspacecreatedevicergb();  uint8 * m_pixelbuf = malloc(sizeof(uint8) * height * width * 4);  nsuinteger bytesperpixel = 4; nsuinteger bytesperrow = bytesperpixel * width; nsuinteger bitspercomponent = 8; cgcontextref context = cgbitmapcontextcreate(m_pixelbuf, width, height,                                              bitspercomponent, bytesperrow, colorspace,                                              kcgimagealphapremultipliedlast | kcgbitmapbyteorder32big);  cgcontextdrawimage(context, cgrectmake(0, 0, width, height), imageref); cgcontextrelease(context);  //alter alpha int length = height * width * 4; (int i=0; i<length; i+=4) {     m_pixelbuf[i+3] =  255*alpha; }   //create new image cgcontextref ctx = cgbitmapcontextcreate(m_pixelbuf, width, height,                                          bitspercomponent, bytesperrow, colorspace,                                          kcgimagealphapremultipliedlast | kcgbitmapbyteorder32big);  cgimageref newimgref = cgbitmapcontextcreateimage(ctx); cgcolorspacerelease(colorspace); cgcontextrelease(ctx); free(m_pixelbuf);  uiimage *finalimage = [uiimage imagewithcgimage:newimgref]; cgimagerelease(newimgref);  return finalimage;

}


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua...
Read more

android - java.net.UnknownHostException(Unable to resolve host “URL”: No address associated with hostname) -

i developing app testing asp.net webservice in android.for simple webservice adding 2 numbers used.where numbers passed parameters.the result in dialogue.the webserver works in local. when application runs following result exception.i provided internet permission in manifest. java.net.unknownhostexception(unable resolve host “ http://url.com/ ”: no address associated hostname) my code given below main activity public static string rslt=""; /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); button b1=(button)findviewbyid(r.id.button1); final alertdialog ad=new alertdialog.builder(this).create(); b1.setonclicklistener(new onclicklistener() { @override public void onclick(view arg0) { // todo auto-generated method stub try { ...
Read more