javascript - drawImage() with wrong coordinates canvas -


i have problem: i'm working on map generator, using html canvas, user inputs x,y, width , height of image. when use drawimage users input, image doesn't fit canvas xy , select height , width in pixels. there can use solve this?

<html lang=''> <head>    <title>map tools</title> </head> <body>     <div align='center'>         <canvas id='map' class='mapcanvas' width="800" height="400">         </canvas>         <p><a href="#" onclick="loadxml()" class="submitbutton">send</a></p>         <textarea id="xmlinput" class="inputtextarea" placeholder="coords"></textarea>     </div> </body> <script> function loadxml(){ co = document.getelementbyid("xmlinput").value.split(',') // x, y, h, l canvas = document.getelementbyid("map"); context = canvas.getcontext("2d"); ground.src = 'http://i.imgur.com/z3dymam.png' ground.onload = function (){ context.drawimage(ground, co[0], co[1], co[2], co[3]); } } </script> </html>

ground undefined. i've put in you.

<html lang=''>  <head>     <title>map tools</title>  </head>  <body>      <div align='center'>          <canvas id='map' class='mapcanvas' width="800" height="400">          </canvas>          <p><a href="#" onclick="loadxml()" class="submitbutton">send</a></p>          <textarea id="xmlinput" class="inputtextarea" placeholder="coords"></textarea>  			<img id='ground' style='display: none' /> <!--you forgot image!-->      </div>  </body>  <script>  function loadxml(){    var co = document.getelementbyid("xmlinput").value.split(','), // x, y, h, l        canvas = document.getelementbyid("map"),        context = canvas.getcontext("2d"),        ground = document.getelementbyid('ground'); //ground undefined!    ground.src = 'http://i.imgur.com/z3dymam.png'    ground.onload = function (){      context.drawimage(ground, co[0], co[1], co[2], co[3]);    }  }  </script>  </html>


Comments

Post a Comment

Popular posts from this blog

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

php - Bypass Geo Redirect for specific directories -

i'm trying bypass redirect specific url within site. wondering if might able help. the code below code use, original urls replaces example.com i'd able access http://example.com/admin without redirect occuring. is there way this, , there way using own ip? function country_geo_redirect() { $country = getenv('http_geoip_country_code'); if ($country == "us" ) { wp_redirect("http://usa.example.com/"); exit; } else if ($country == "gb" ) { wp_redirect("http://uk.example.com/"); exit; } } add_action('init', 'country_geo_redirect'); you can bypass redirection code if server found ip address. if ip address == <my ip address> ' nothing here else country_georedirect() end if
Read more

php - .htaccess mod_rewrite for dynamic url which has domain names -

i want convert url ex:( example.com/link.php?url=facebook.com ) ( example.com/facebook.com.php ) how can using .htaccess. or there other process make job easier ? i tried adding script .htaccess file options +followsymlinks rewriteengine on rewriterule url-(.*)\.htm$ link.php?url=$1 but converting url adding "url-" ( example.com/url-facebook.com.php ) i want remove "url-" , want make ( example.com/facebook.com.php ) rewriteengine on rewritecond %{the_request} ^get.*link\.php\?url\= [nc] rewritecond %{request_uri} !/system/.* [nc] rewriterule (.*?)link\.php\?url\=/*(.*) /$1$2 [r=301,ne,l] not sure how above work edit of used use remove index.php url
Read more