Canvas - The Cure
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An introduction to the HTML5 canvas element and what you can do with it. The key is using it all together in the demo at the end
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Canvas - The Cure
- 1. The Cure
- 5. Canvas
- 6. Apple even creates open standards for the web -Steve Jobs
- 8. <canvas id="my-canvas" width="700" height="600"> I am canvas </canvas>
- 9. var canvas = document.getElementById("my-canvas"), context = canvas.getContext("2d"); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100);
- 11. context.save(); context.fillStyle = "rgba(0, 0, 200, 0.5)"; context.fillRect(50, 50, 100, 100); context.clearRect(40, 40, 20, 20); context.restore();
- 13. context.fillRect(350, 50, 100, 100); context.lineWidth = "10"; context.lineJoin = "round"; context.moveTo(50, 50); context.lineTo(200, 200); context.lineTo(100, 300); context.closePath(); context.stroke(); context.fill();
- 15. context.beginPath(); context.strokeStyle = "#00f"; context.arc(200, 400, 75, 0, Math.PI*2, false); context.stroke();
- 17. context.fillStyle = "#f00"; context.bezierCurveTo(100, 100, 10, 10, 250, 30); context.fill();
- 19. var gradient = context.createLinearGradient(0, 0, 0, canvas.height); gradient.addColorStop(0, "#f00"); gradient.addColorStop(1, "#ffffa2"); context.fillStyle = gradient; context.fillRect(0, 0, canvas.width, canvas.height);
- 21. var canvas = document.getElementById("my-canvas"), context = canvas.getContext("2d"), img = document.createElement("img"); img.addEventListener("load", function () { context.drawImage(img, 0, 0, 600, 200); }, false); img.setAttribute("src", "view.jpg");
- 22. var patternImg = document.createElement("img"); patternImg.onload = function () { context.strokeStyle = context.createPattern(this, "repeat"); context.stroke(); }; patternImg.src = "view-small.jpg";
- 25. context.fillStyle = "#fff"; context.fillRect(0, 0, 200, 200); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.fillRect(100, 100, 100, 100);
- 27. context.strokeStyle = "transparent"; context.arc(100, 100, 75, 0, Math.PI*2, false); context.clip(); context.stroke(); context.fillStyle = "#fff"; context.fillRect(0, 0, 200, 200); context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.fillRect(100, 100, 100, 100);
- 30. context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.save(); context.translate(200, 200); context.fillStyle = "rgba(0, 0, 200, 0.5)"; context.fillRect(0, 0, 100, 100); context.restore(); context.fillRect(0, 200, 100, 100);
- 33. context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.save(); context.translate(200, 200); context.scale(2, 2); context.fillStyle = "rgba(0, 0, 200, 0.5)"; context.fillRect(0, 0, 100, 100); context.restore(); context.fillRect(0, 200, 100, 100);
- 36. context.fillStyle = "#f00"; context.fillRect(0, 0, 100, 100); context.save(); context.translate(200, 200); context.rotate(0.23); context.fillStyle = "rgba(0, 0, 200, 0.5)"; context.fillRect(0, 0, 100, 100); context.restore(); context.fillRect(0, 200, 100, 100);
- 39. context.fillStyle = "#000"; context.font = "16px Helvetica Neue"; context.fillText("I am text on canvas - how cool is that?", 200, 250);
- 40. context.fillStyle = "#000"; context.font = "16px Helvetica Neue"; context.shadowColor = "rgba(100, 100, 100, 0.5)"; context.shadowOffsetX = 5; context.shadowOffsetY = 5; context.fillText("I am text on canvas - how cool is that?", 200, 250);
- 43. // Image for loading var img = document.createElement("img"), img.addEventListener("load", function () { context.drawImage(img, 0, 0); }, false);
- 44. // To enable drag and drop canvas.addEventListener("dragover", function (evt) { evt.preventDefault(); }, false); // Handle dropped image file - only Firefox and Google Chrome canvas.addEventListener("drop", function (evt) { var files = evt.dataTransfer.files; if (files.length > 0) { var file = files[0]; if (typeof FileReader !== "undefined" && file.type.indexOf("image") != -1) { var reader = new FileReader(); // Note: addEventListener doesn't work in Google Chrome for this event reader.onload = function (evt) { img.src = evt.target.result; }; reader.readAsDataURL(file); } } evt.preventDefault(); }, false);
- 46. var mouseDown = false, brushColor = "rgb(0, 0, 0)"; // Detect mousedown canvas.addEventListener("mousedown", function (evt) { mouseDown = true; context.beginPath(); }, false); // Detect mouseup canvas.addEventListener("mouseup", function (evt) { mouseDown = false; var colors = context.getImageData(evt.layerX, evt.layerY, 1, 1).data; brushColor = "rgb(" + colors[0] + ", " + colors[1] + ", " + colors[2] + ")"; }, false); // Draw, if mouse button is pressed canvas.addEventListener("mousemove", function (evt) { if (mouseDown) { context.strokeStyle = brushColor; context.lineWidth = 20; context.lineJoin = "round"; context.lineTo(evt.layerX+1, evt.layerY+1); context.stroke(); } }, false);
- 50. ???
- 51. The Cure - Demo
- 52. HTML5 Canvas for Internet Explorer <= 8 - explorercanvas
- 53. Robert Nyman http://robertnyman.com/ Twitter: @robertnyman Pictures: The Cure: http://www.amoeba.com/blog/2007/07/pen-is-mightier-than-the-sword/new-siouxsie-video-into-a-swan.html Robocop: http://www.meh.ro/2010/04/01/murphy-as-robocop/ Sticky tape: http://damncoolpics.blogspot.com/2011/02/funny-graphs-and-charts.html Canvas: http://www.ioffer.com/c/Drawings-1000407 Wash machine: http://www.mymodernmet.com/profiles/blogs/a-father-who-creatively Clip: http://pics33.blogspot.com/2010/08/best-examples-of-creative-edit-images.html Lost in translation: http://www.impawards.com/2003/lost_in_translation_ver2.html Coffe machine: http://www.mymodernmet.com/profiles/blogs/a-father-who-creatively Throwing: http://pics33.blogspot.com/2010/08/best-examples-of-creative-edit-images.html Text: http://www.identifont.com/show?3OI Drag me: http://www.stardusttrailers.com/scheda_wallpaper.php?id=17261&titolo=Drag%20Me%20to%20Hell Drawing: http://www.mathacademy.com/pr/minitext/escher/big.asp?image=drawing_hands Protect painting: http://yellowpagescoupons.net/protect-painting-200-licensed-experienced-professional-detailed-prep-painters-sf-east-bay-area-ca-yellow-pages-coupons/ Calvin & Hobbes:http://www.fanpop.com/spots/calvin-and-hobbes/images/1395524/title/calvin-hobbes-hugging-wallpaper