javascript - HTML5 Canvas; Image clipping and multiple images -

-

i'm new canvas , i'm having issues.

i'm trying accomplish 1 end goal: display 2 images in single canvas; 1 image background, other image clipped png , appears on top.

i'm part way there i've hit wall , don't know how past it.

i've create jsfiddle @ http://jsfiddle.net/jhp79yg9/

      function loadimages(sources, callback) {          var images = {};          var loadedimages = 0;          var numimages = 0;          // num of sources          for(var src in sources) {            numimages++;          }          for(var src in sources) {            images[src] = new image();            images[src].onload = function() {              if(++loadedimages >= numimages) {                callback(images);              }            };            images[src].src = sources[src];          }        }        var canvas = document.getelementbyid('canvas');        var context = canvas.getcontext('2d');          var sources = {          img1: 'https://scontent-iad3-1.cdninstagram.com/hphotos-xaf1/t51.2885-15/11351598_1454928098145798_1274636321_n.jpg',          img2: 'https://igcdn-photos-c-a.akamaihd.net/hphotos-ak-xaf1/t51.2885-15/11379733_1139595366067106_273993739_n.jpg',          mask: 'http://img12.deviantart.net/65e4/i/2013/003/6/6/png_floating_terrain_by_moonglowlilly-d5qb58m.png'        };          loadimages(sources, function(images) {          context.drawimage(images.img2, 0, 0, 240, 240);                    context.drawimage(images.mask, 20, 95, 500, 349);          context.globalcompositeoperation = 'source-in';          context.drawimage(images.img1, 0, 0, 540, 540);          });
<canvas id="canvas" width="540" height="540"></canvas>

in example i've reduced size of first image 140x140 540x540 can tell if it's messing up, is.

what's happening it's not showing second image, it's showing 'img1' variable twice instead of showing 'img2' @ all.

can offer assistance?

i can't tell, because it's rendering same image, in foreground , in background. there appreciated (the clipped image should in foreground).

thanks!

another approach cut out mask current content , draw background behind current content:

loadimages(sources, function(images) {     context.drawimage(images.img2, 0, 0, 540, 540);     context.globalcompositeoperation = 'destination-out';     context.drawimage(images.mask, 20, 95, 500, 349);     context.globalcompositeoperation = 'destination-atop';     context.drawimage(images.img1, 0, 0, 540, 540); })

http://jsfiddle.net/jhp79yg9/6/


Comments

Post a Comment

Popular posts from this blog

Fail to load namespace Spring Security http://www.springframework.org/security/tags -

-
i have problem namespace of spring security on xhtml page. don't understand why can't load uri, , have following issue: whitelabel error page application has no explicit mapping /error, seeing fallback. tue jul 21 16:58:12 utc 2015 there unexpected error (type=not found, status=404). please need help! possible uri has been changed? best regards you using incorrect namespace url. correct url http://www.springframework.org/schema/security the error page seeing spring source website since not recognize url. try visiting http://www.springsource.org/security/tags in browser update : spring security tags used in jsp page correct tag lib declaration is: <%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>
Read more

sql - MySQL query optimization using coalesce -

-
can explain me why second query faster first? (first 1 takes around 40 seconds, second 1 less 0.1) select releases.feature_code, releases.platform_id, version, release_date, general_available, uri, filesize, display_name, feature_name.full_name, if ((select exists(select 1 release_exceptions releases.feature_code = release_exceptions.feature_code , releases.platform_id = release_exceptions.platform_id , releases.version = release_exceptions.version) = 1), 1, 0) release_exceptions releases left outer join platform using(platform_id) left outer join feature_name using(feature_code) order version desc; ~~~ query 2 ------------------ ~~~ select feature_code, version, release_date, general_available, platform_id, uri, filesize, display_name, feature_name.full_name, coalesce(release_exceptions, 0) release_exceptions mus.releases left outer join ( select distinct feature_code, version, platform_id, 1 release_exceptions mus.release_exceptions ) release_exceptions using ...
Read more

unity3d - Unity local avoidance in user created world -

-
i'm using unity3d networked multiplayer online game have large complex 3d terrain scene forest, trees, cliff, hills, mountains, bounders, etc. players can build structures sort of minecraft, , put them anywhere in scene, or move them around anytime. aside human controlled players, there automated ai players , objects animals roaming around scene following path. the problem how make these automated ai players , animals, able navigate around static , dynamic player created structures, because path follow can blocked player created structures, or other players , other ai objects, cliffs etc. have find away around them or on track if tumble down off high cliff example. so made navmesh , used navagents, takes care of static, non moving objects, how make ai players navigate around each other , dynamic structures created players can number in hundreds? i thought of adding navmeshobstacle everything, result in being attached hundreds of objects since user created structures b...
Read more