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Canvas element
- 1. CANVAS ELEMENTpor davidson fellipe
- 2. who ?desenvolvedor na globo.comentusiasta de tecnologias client-side desde 2002engenheiro da computação
- 3. assuntos relacionadoscanvasjavascripthtml 5canvas x svg
- 4. o que é o elemento canvas?criado pela apple para os widgets do Dashboard OS Xdesenhos bitmap 2D, 3D (futuro)html+javascriptespecificação w3cimplementado para o Safari e Chrome.browsers baseados no Gecko 1.8 também suportam.
- 5. suporte
- 6. para não variar...
- 7. explorercanvas
- 8. explorercanvas<!--[if lt IE9]><script src="excanvas.js"></script><![endif]-->
- 9. explorercanvasvar el = document.createElement(canvas);G_vmlCanvasManager.initElement(el);var ctx = el.getContext(2d);
- 10. EXEMPLOS DE USO
- 11. ferramentasdraw2D javascript drawinglibrarycufonflot
- 12. CANVAS vs. SVG
- 13. canvas vs. svg performance desenhos independente de 2D resolução salvar resultado em png controle dos elementos via DOM adequado para gráficos, imagens e manipulaçoes baseado em XML de pixels processamento lento a desempenho constante medida que aumenta a complexidade da DOMhttp://borismus.com/canvas-vs-svg-performance/
- 14. CODE
- 15. rotacionando um imagem
- 16. rotacionando um imagem<!DOCTYPE HTML><html>! <head>! </head>! <body>! ! <img src="teste.jpg" id="image" style="display:none;width:500px;height:375;" />! ! <canvas id="simpleCanvas" width="500" height="375"> ! Seja mais feliz, não use IE!! ! </canvas>! ! <script type="text/javascript"> //proximo slide! ! </script>! </body></html>
- 17. rotacionando um imagemwindow.onload = function(){! var canvas = document.getElementById(simpleCanvas);! if (canvas && canvas.getContext) {! ! var image = document.getElementById(image);! ! canvas.height = image.width;! ! canvas.width = image.height;! ! var context = canvas.getContext(2d);! ! //mover de um ponto a outro do grid! ! context.translate(image.height, 0);! ! context.rotate(Math.PI / 2);! ! context.drawImage(image, 0, 0);! ! context.restore();! }};
- 18. imprimindo pontos
- 19. imprimindo pontos<!DOCTYPE HTML><html>! <head>! ! <style type="text/css" media="screen">! ! ! #simpleCanvas{height:520px;width:520px;}! ! </style>! </head>! <body>! ! <canvas id="simpleCanvas">! ! ! Seja mais feliz, não use IE!! ! </canvas>! ! <script type="text/javascript"> window.onload = function(){ //proximo slide };! ! </script>! </body></html>
- 20. imprimindo pontos! ! var data = [{x: 0,y:0},! ! ! ! ! ! ! {x: 50,y:50},! ! ! ! ! ! ! {x: 100,y:120},! ! ! ! ! ! ! {x: 100,y:200},! ! ! ! ! ! ! {x: 300,y:200},! ! ! ! ! ! ! {x: 400,y:100}];! ! ! ! ! ! var canvas = document.getElementById(simpleCanvas);
- 21. imprimindo pontosif (canvas && canvas.getContext) {! var context = canvas.getContext(2d);! ! ! !! //proximo slide}
- 22. imprimindo pontos //configurar largura do canvas canvas.height = canvas.clientHeight; canvas.width = canvas.clientWidth;! ! ! ! !! ! //caracteristicas do chart var padding = 10; var widthChart = canvas.width - (2*padding); var heightChart = canvas.width - (2*padding); //tamanho marcadores var size_x = 10; var size_y = 10; var axis_x = 0; var axis_y = 0;
- 23. imprimindo pontoscontext.fillStyle = "#fff";context.strokeStyle = "#CCCCCC";context.lineWidth = 20;context.strokeRect(0, 0, canvas.width, canvas.height);context.fillRect(10, 10, widthChart, heightChart);context.fill();var marginLine = 0;context.lineWidth = 1;
- 24. imprimindo pontos //descrever linhas! ! for(var numberLine = 0; numberLine < 10; numberLine ++) {! ! ! ! ! ! marginLine = numberLine * (widthChart/10) + padding; context.moveTo(marginLine, padding); context.lineTo(marginLine, canvas.height - padding); context.moveTo(padding, marginLine); context.lineTo(canvas.width - padding, marginLine); }! ! ! ! ! //imprimir linhas context.strokeStyle = "#eee"; context.stroke();
- 25. imprimindo pontos//imprimindo os pontosfor(a in data){ axis_x = data[a].x + padding - (size_x/2); axis_y = canvas.height - (data[a].y - (size_y/2)) - 2*padding; context.fillStyle = #cc0000; context.fillRect(axis_x, axis_y, size_x, size_y);}
- 26. imprimindo pontos //imprimindo o texto context.font = italic 400 20px Georgia, serif; context.fillStyle = "#666";! ! context.fillText("BrazilJS - Fortaleza 2011", 30, 40,140);! ! context.textAlign = "center";
- 27. referências https://developer.mozilla.org/en/Canvas_tutorial http://diveintohtml5.org/canvas.html#divingin http://code.google.com/p/explorercanvas/ http://code.google.com/p/flot/ http://cufon.shoqolate.com/generate/ http://javascript.open-libraries.com/utilities/drawing/draw2d- javascript-drawing-library/ http://philip.html5.org/tests/canvas/suite/tests/results.html http://www.w3.org/TR/SVG/svgdom.html
- 28. obrigado ! email@fellipe.com www.fellipe.com @davidsonfellipe github.com/davidsonfellipe