{"id":24856,"date":"2019-02-01T09:59:42","date_gmt":"2019-02-01T09:59:42","guid":{"rendered":"https:\/\/www.knowband.com\/blog\/?p=24017\/"},"modified":"2021-01-12T15:17:01","modified_gmt":"2019-02-01T09:59:42","slug":"como-criar-v%c3%a1rias-miniaturas-ao-carregar-a-imagem","status":"publish","type":"post","link":"https:\/\/www.knowband.com\/blog\/pt-br\/dicas\/como-criar-v%c3%a1rias-miniaturas-ao-carregar-a-imagem\/","title":{"rendered":"Como criar v\u00e1rias miniaturas ao carregar a imagem?"},"content":{"rendered":"<h2>Objetivos do blog<\/h2>\n<p>Depois de ler este blog, poderemos criar v\u00e1rias miniaturas enquanto carregamos uma imagem. Neste blog podemos aprender como redimensionar o tamanho da imagem usando o c\u00f3digo.<\/p>\n<h2>Vamos conhecer as miniaturas<\/h2>\n<p>Miniaturas s\u00e3o as vers\u00f5es de tamanho reduzido de fotos ou v\u00eddeos. Miniaturas s\u00e3o criadas a partir da imagem original, reduzindo sua dimens\u00e3o e tamanho. Criando miniaturas, podemos representar uma imagem de tamanho grande por uma imagem pequena. O site, como lojas de com\u00e9rcio eletr\u00f4nico on-line, usa imagens em miniatura em vez de imagens grandes para reduzir o tempo de carregamento de sua p\u00e1gina da Web, o que tamb\u00e9m torna o site mais r\u00e1pido. Para entender tecnicamente o funcionamento das miniaturas, vamos fazer um programa simples. O requisito foi compartilhado abaixo:<\/p>\n<h2>Exig\u00eancia<\/h2>\n<p>Vamos entender o requisito primeiro. Digamos que temos um site chamado Knowband, que vende os m\u00f3dulos para a plataforma de e-commerce, como Magento, Prestashop, Opencart etc. Ele mostra tantas imagens na p\u00e1gina de listagem dos m\u00f3dulos da Knowband. As imagens originais s\u00e3o de tamanho grande, o que aumenta diretamente o tempo de carregamento da p\u00e1gina de listagem, de modo a reduzir o tempo de carregamento da p\u00e1gina. O site da Knowband usa imagens em miniatura na p\u00e1gina de listagem. Neste blog, podemos aprender a criar v\u00e1rias miniaturas de uma imagem. Vamos considerar um exemplo, onde vamos criar tr\u00eas miniaturas, como mostrado na imagem abaixo:<\/p>\n<p><a href=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2.png\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24005 size-full\" src=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2.png\" alt=\"thumbnails\" width=\"1217\" height=\"562\" srcset=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2.png 1217w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2-300x139.png 300w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2-768x355.png 768w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/Picture2-2-1024x473.png 1024w\" sizes=\"auto, (max-width: 1217px) 100vw, 1217px\" \/><\/a><\/p>\n<h2>Fun\u00e7\u00e3o para criar a miniatura<\/h2>\n<p>Vamos entender a funcionalidade principal ou c\u00f3digo que \u00e9 realmente respons\u00e1vel por criar as miniaturas. Uma fun\u00e7\u00e3o \u00e9 dada abaixo, que \u00e9 respons\u00e1vel pela cria\u00e7\u00e3o da miniatura. Vamos entender a fun\u00e7\u00e3o como ela realmente funcionou.<\/p>\n<h3>Abaixo da fun\u00e7\u00e3o tem par\u00e2metros 4<\/h3>\n<p>O c\u00f3digo de cria\u00e7\u00e3o de v\u00e1rias miniaturas durante o upload de uma imagem \u00e9 fornecido abaixo:<\/p>\n<ul>\n<li><strong>$ source_path:<\/strong> Este cont\u00e9m o caminho da imagem original.<\/li>\n<li><strong>$ target_path:<\/strong> Cont\u00e9m o caminho da miniatura que ser\u00e1 criada.<\/li>\n<li><strong>$ file_type:<\/strong> Este cont\u00e9m a extens\u00e3o da imagem, por exemplo, jpg, png etc.<\/li>\n<li><strong>$ thumb_width:<\/strong> \u00c9 a largura da imagem em miniatura necess\u00e1ria.<\/li>\n<li><strong>$ thumb_height:<\/strong> \u00c9 a altura da imagem em miniatura necess\u00e1ria.<\/li>\n<\/ul>\n<p>Essa fun\u00e7\u00e3o simplesmente busca a imagem do arquivo de origem e, depois de validar a imagem, cria a miniatura de largura e altura especificadas. Ent\u00e3o, para criar as miniaturas do n\u00famero &#39;n&#39;, temos que chamar essa fun\u00e7\u00e3o &#39;n&#39; n\u00famero de vezes com a largura e a altura necess\u00e1rias da miniatura. Esta fun\u00e7\u00e3o retornar\u00e1 TRUE se a miniatura for criada com sucesso, sen\u00e3o retornar\u00e1 FALSE.<\/p>\n<pre class=\"brush: actionscript3; gutter: true\">function create_thumbnail ($ source_path, $ target_path, $ file_type, $ thumb_width, $ thumb_height) {\/\/ Verificando o tipo de arquivo. if ($ file_type == &#39;jpeg&#39; || $ file_type == &#39;jpg&#39;) {$ fonte = imagecreatefromjpeg ($ source_path); } else if ($ file_type == &#39;png&#39;) {$ fonte = imagecreatefrompng ($ source_path); } else if ($ file_type == &#39;gif&#39;) {$ fonte = imagecreatefromgif ($ source_path); } \/\/ obt\u00e9m a largura da imagem original $ width = imagesx ($ source); \/\/ obt\u00e9m a altura da imagem original $ height = imagesy ($ source); \/\/ Crie uma imagem em preto do tamanho da imagem do polegar $ thumb_image = imagecreatetruecolor ($ thumb_width, $ thumb_height); \/\/ Copie e redimensione parte de uma imagem original e fa\u00e7a uma nova amostragem na imagem miniatura para criar uma imagem de tamanho reduzido da imagem original imagecopyresampled ($ thumb_image, $ source, 0, 0, 0, $ thumb_width, $ thumb_height, $ width , $ height); \/\/ cria um arquivo JPEG da imagem especificada e salva-o na pasta de destino. if (imagejpeg ($ thumb_image, $ target_path, 0)) {\/\/ destruir as imagens para libertar a mem\u00f3ria associada a elas imagedestroy ($ thumb_image); imagedestroy ($ source); retorno verdadeiro; } mais {return FALSE; }}<\/pre>\n<p><a href=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2019\/01\/thumbnail.zip\" target=\"_blank\">Clique aqui para baixar o projeto completo<\/a>.<\/p>\n<h2>Resumo<\/h2>\n<p>Depois de ler este documento, voc\u00ea pode tentar o mesmo c\u00f3digo no seu sistema. Depois de fazer o mesmo, voc\u00ea pode facilmente saber como as miniaturas funcionam.<script data-cfasync=\"false\" src=\"https:\/\/tdns2.gtranslate.net\/tdn-bin\/queue.js\"><\/script><!-- Yandex.Metrika counter for GTranslate --><script data-cfasync=\"false\">(function (d, w, c) { (w[c] = w[c] || []).push(function() { try { w.yaCounter36618640 = new Ya.Metrika({ id:36618640, clickmap:true, trackLinks:true, accurateTrackBounce:true, ut:\"noindex\" }); } catch(e) { } }); var n = d.getElementsByTagName(\"script\")[0], s = d.createElement(\"script\"), f = function () { n.parentNode.insertBefore(s, n); }; s.type = \"text\/javascript\"; s.async = true; s.src = \"https:\/\/mc.yandex.ru\/metrika\/watch.js\"; if (w.opera == \"[object Opera]\") { d.addEventListener(\"DOMContentLoaded\", f, false); } else { f(); } })(document, window, \"yandex_metrika_callbacks\"); <\/script> <noscript><\/p>\n<div><img decoding=\"async\" src=\"https:\/\/mc.yandex.ru\/watch\/36618640?ut=noindex\" style=\"position:absolute; left:-9999px;\" alt=\"\" \/><\/div>\n<p><\/noscript><br \/>\n<!-- delivered by GTranslate v4.8.7 in 7ms visit https:\/\/gtranslate.io --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objetivos do blog Depois de ler este blog, poderemos criar v\u00e1rias miniaturas enquanto carregamos uma imagem. Neste blog podemos aprender como redimensionar o tamanho da imagem usando o c\u00f3digo. Vamos conhecer as miniaturas Miniaturas s\u00e3o as vers\u00f5es de tamanho reduzido de fotos ou v\u00eddeos. Miniaturas s\u00e3o criadas a partir da imagem original, reduzindo sua dimens\u00e3o [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kbui_enabled":"","footnotes":""},"categories":[3274],"tags":[8906,8908,8907,8905],"class_list":["post-24856","post","type-post","status-publish","format-standard","hentry","category-dicas","tag-criar-miniaturas","tag-miniatura-da-imagem","tag-miniatura-mltipla","tag-miniaturas"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Como criar v\u00e1rias miniaturas ao carregar a imagem? - Knowband Blog | Ecommerce Modules<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.knowband.com\/blog\/pt-br\/dicas\/como-criar-v\u00e1rias-miniaturas-ao-carregar-a-imagem\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como criar v\u00e1rias miniaturas ao carregar a imagem? - Knowband Blog | Ecommerce Modules\" \/>\n<meta property=\"og:description\" content=\"Objetivos do blog Depois de ler este blog, poderemos criar v\u00e1rias miniaturas enquanto carregamos uma imagem. Neste blog podemos aprender como redimensionar o tamanho da imagem usando o c\u00f3digo. Vamos conhecer as miniaturas Miniaturas s\u00e3o as vers\u00f5es de tamanho reduzido de fotos ou v\u00eddeos. 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