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PHP grafica dinamica, grafici e gradienti

PHP grafica dinamica, grafici e gradienti


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About the Book

PHP dispone di un set di istruzioni dedicato alla grafica capace di creare immagini dinamiche. Questo manuale è una guida all'uso avanzato di questo set denominato GD library. Nelle applicazioni web o gestionali online è importante, spesso essenziale, ottenere Grafici in Pagine Web specifiche: questa guida illustra come migliorare la qualità del proprio lavoro nella presentazione grafica. PHP, con la libreria grafica GD, permette di ottenere grafici con dati provenienti da database, form o acquisiti da altra fonte con risultati completi e leggeri. La guida "PHP grafica dinamica, grafici e gradienti" (continuazione ideale di: "PHP grafica dinamica, funzioni e figure") dando per acquisita una conoscenza delle funzioni grafiche di base, mostra come sia possibile ottenere con estrema facilità immagini rappresentative dei dati. Fra queste: -Grafici lineari, a barre e a torta con legenda circolare, 2D e 3D anche con scelta manuale o automatizzata dei colori, e del posizionamento dei valori e delle legende in qualsiasi punto (per i diagrammi circolari anche intorno ad essi con la possibilità di evidenziarne i settori mediante estrazione di porzioni). -Maschere per estrarre da immagini settori, di qualsiasi forma, e creazione di poligoni 3d. Generazione dinamica di immagini stellari con quantità di punte, rotazione e colori a scelta. -Ellissi e spiraliruotate di n gradi, logotipi ed emoticons dinamiche. -Frasi su circonferenze ed ellissi con calcolo delle dimensioni dei font TrueType. -Gradienti lineari e 2 o più colori, sferici, e poligonali. Tutti gli script di questa guida operano esclusivamente con le funzioni GD Library di PHP, senza uso di classi o software aggiuntivi. Gli esempi del libro sono anche implementati in pagine PHP dinamiche sul sito dell'autore, dove si può cambiare i valori sui quali sono create le immagini e vederle dinamicamente ricostituite sui nuovi parametri, e ne è possibile fare il download del codice sorgente. Gli esempi e gli script possono essere copiati, modificati e utilizzati senza chiedere autorizzazioni. La lettura della guida "PHP grafica dinamica, funzioni e figure" (conoscenza delle funzioni di base della libreria) è propedeutica ma non indispensabile all'uso di quanto esposto nel presente volume. Alcune delle caratteristiche descritte in "PHP grafica dinamica, funzioni e figure" sono il supporto per il disegno di forme primitive, quali linee, poligoni, archi, ellissi ecc. Supporto per immagini truecolor a canale alfa per trasparenza opacità e dissolvenza, fusione e ricampionamento fra più immagini. Supporto per i font TrueType. Entrambe le guide sono anche pubblicate in un unico volume dal titolo: "Usare GD library con PHP: funzioni, figure, grafici e gradienti"


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Product Details
  • ISBN-13: 9781533498847
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 74
  • Series Title: Italian
  • Weight: 308 gr
  • ISBN-10: 1533498849
  • Publisher Date: 04 Jun 2016
  • Binding: Paperback
  • Language: Italian
  • Returnable: N
  • Spine Width: 5 mm
  • Width: 216 mm


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