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Usare GD library con PHP: funzioni, figure, grafici e gradienti by Taccetti, Antonio

Usare GD library con PHP: funzioni, figure, grafici e gradienti

by Antonio Taccetti
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Book cover type: Paperback
  • ISBN13: 9781530251124
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Publication Date:
  • Pages: 174
  • Original Price: USD 30.0
  • Language: Italian
  • Edition: N/A
  • Item Weight: 418 grams
  • BISAC Subject(s): Languages / PHP

Il libro si rivolge a chi, pur senza conoscenze avanzate di PHP, desidera implementare grafici ed immagini dinamiche personalizzate con la libreria grafica GD integrata in questo linguaggio. Presenta una raccolta di script PHP/GD impiegati per le più svariate tipologie e soluzioni grafiche. Gli script operano esclusivamente con le funzioni GD a corredo di PHP, senza uso di classi o software aggiuntivi. Ogni script, testato e funzionante, è descritto e commentato in lingua italiana. Esempi del libro sono implementati in pagine PHP dinamiche sul sito dell'autore. In queste pagine l'utente può cambiare i valori sui quali sono create le immagini e queste verranno dinamicamente ricostituite sui nuovi parametri. Dal sito dell'autore è possibile fare il download del codice sorgente del libro. Gli esempi e gli script possono essere copiati, modificati e utilizzati, senza chiedere autorizzazioni. Estratto del sommario: Recuperare informazioni sulla libreria GD installata. Nozioni di Computer Grafica e sistemi di coordinate. Tipi di immagine Vettoriale e Raster, GIF, PNG, JPEG e Metadati jpeg. Immagini: Creazione di nuove immagini e manipolazione di esistenti, trasparenza a 256 colori e truecolor con canale alfa. Unione, rotazione, ribaltamento, fusione d'immagini con trasparenze e filtri per effetti speciali. Sfumature e fusione fra immagini senza e con trasparenza, preservando le trasparenze. Ribaltamento e rotazione, con uso di imageflip e suo superamento con la funzione imagecopyresampled. Uso di Copy: imagecopy(), copiare parte dell'immagine; imagecopyresized(), copia e ridimensiona una parte dell'immagine; imagecopymerge(), copia e unisce parti d'immagini; imagecopyresampled(), copia ridimensiona immagini con ricampionamento. Ellissi ruotate di n gradi, vortici e spirali con formule per trasporre circonferenze ed archi individuando i punti sul piano cartesiano. Grafici: Lineari, a barre e torta con legenda circolare, 2d e 3d con scelta automatizzata dei colori. Posizionamento valori intorno ai grafici a torta con evidenziazione dei settori mediante estrazione di porzioni del grafico. Maschere: Creare oggetti 3d, stelle con n punte e rotazione, frasi su circonferenze ed emicirconferenze, estrarre parti da immagini esistenti, di ogni sagoma, anche con trasparenza. Disegnare con il testo: Conoscere e definire altezza e larghezza in pixel dei font a corredo GD e True Type Font esterni. Comprendere e impostare le coordinate delimitanti frasi e lettere. Uso dei caratteri TTF, rotazioni di frasi su curve orizzontali, verticali e inclinate di n gradi, colori e dissolvenze. Funzione imagefilter: Applicazione filtri alle immagini, effetti con filtri multipli e custom. Gradienti: Creazione e manipolazione dei i canali colore. Scelta e costruzione dei gradenti lineari a 2 e 3 colori, sferici ed a stella.

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