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Diffstat (limited to 'dvd/dvd.js')
| -rw-r--r-- | dvd/dvd.js | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/dvd/dvd.js b/dvd/dvd.js new file mode 100644 index 0000000..e0b4e38 --- /dev/null +++ b/dvd/dvd.js @@ -0,0 +1,191 @@ +/* +DVD Screensaver JS v0.1.0 +Copyright 2018 Yaroslav de la Peña Smirnov +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted (subject to the limitations in the disclaimer +below) provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + * Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from this + software without specific prior written permission. + +NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY +THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND +CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR +CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, +EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR +BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER +IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +POSSIBILITY OF SUCH DAMAGE. +*/ + +function dvdScreensaver(options={}){ + /* >>> Parameters <<< + There are just two customizable parameters + The speed in pixels/s + And a list of colors + */ + var speed = options.hasOwnProperty('speed') ? options['speed'] : 200; + var colors = [ + "#012fff", + "#ff2190", + "#ce21ff", + "#ffec00", + "#ff8702" + ]; + try{ + if(options["colors"].length > 0){ + colors = option["colors"]; + } + } + catch(e){} + + var canvas = document.getElementById("dvd"); + if(!canvas){ + console.log("There is no #dvd canvas to draw on! Aborting..."); + return; + } + var container = canvas.parentNode; + var ctx = canvas.getContext("2d"); + ctx.save(); + + /* >>> State variables <<< + px, py are the current coordinates + direction is an array with the direction for the x and y axis [x, y] + either 1 or -1 for each axis + boundx, boundy the boundaries for each axis + last is the timestamp of the last rendered frame + */ + var px = 0; + var py = 0; + var direction = [1, 1]; + var boundx; + var boundy; + var last = null; + var currentColor = colors[0]; + + function randomRange(min, max){ + return Math.floor(Math.random() * (max - min - 1)) + min; + } + + function randomInt(max){ + return Math.floor(Math.random() * max); + } + + function resize(){ + // On window/viewport resize, get the new size of the container + // and accordingly resize the canvas, then reinitialize + canvas.height = parseInt(container.offsetHeight); + canvas.width = parseInt(container.offsetWidth); + boundx = canvas.width - 340; + boundy = canvas.height - 154; + try{ window.cancelAnimationFrame(requestedFrame); } + catch(e) {} + initDVD(); + } + + function bounce(){ + // Change the direction after reaching the boundaries of the canvas + if(px === boundx) + direction[0] = -1; + else if(px == 0) + direction[0] = 1; + if(py === boundy) + direction[1] = -1; + else if(py == 0) + direction[1] = 1; + // Change the color randomly + ctx.restore(); + ctx.fillStyle = colors[randomRange(0, colors.length+1)]; + ctx.save(); + } + + function initDVD(){ + px = randomRange(0, boundx); + py = randomRange(0, boundy); + bounce(); + drawLogo(); + requestedFrame = window.requestAnimationFrame(nextFrame); + } + + function drawLogo(){ + ctx.translate(px, py); + ctx.fill(logoPath); + ctx.restore(); + ctx.save(); + } + + function nextFrame(timestamp){ + if(!last) last = timestamp; + let delta = timestamp - last; + // If more than 250ms have passed since last frame, it is assumed + // that the browser stopped calling back frames because the tab/page + // was in the background, thus this frame is ignored, and the last + // timestamp reset + if (delta > 250){ + last = timestamp; + requestedFrame = window.requestAnimationFrame(nextFrame); + return; + } + + ctx.clearRect(0, 0, canvas.width, canvas.height); + px += delta*speed*direction[0]/1000; + py += delta*speed*direction[1]/1000; + + // If px and/or py are out of bounds, equal them to the boundaries + // and change direction and color + px = px > boundx ? boundx : px; + py = py > boundy ? boundy : py; + px = px < 0 ? 0 : px; + py = py < 0 ? 0 : py; + if (px === boundx || py === boundy || px == 0 || py == 0) + bounce(); + drawLogo(); + last = timestamp; + requestedFrame = window.requestAnimationFrame(nextFrame); + } + + resize(); + window.addEventListener("resize", resize); +} + +// For test purposes +function drawLogo(color="#012fff"){ + var canvas = document.getElementById("dvd"); + if(!canvas){ + console.log("There is no #dvd canvas to draw on! Aborting..."); + return; + } + var container = canvas.parentNode; + var ctx = canvas.getContext("2d"); + ctx.save(); + + canvas.height = parseInt(container.offsetHeight); + canvas.width = parseInt(container.offsetWidth); + + let px = canvas.width - 340; + let py = canvas.height - 154; + ctx.translate(px, py); + ctx.fillStyle = "#012fff"; + ctx.fill(logoPath); + ctx.restore(); + ctx.save(); +} + +// This is the path for the logo, it is just a 'd' SVG string +// You can easily 'export' the logo to SVG by copying the string to a +// 'path' tag's 'd' attribute inside an SVG document with size of 340x154px +var logoPath = new Path2D("m 146.99116,153.94326 c -13.35681,-0.18459 -32.78363,-1.02291 -47.688801,-2.05776 -23.466055,-1.62924 -45.981002,-4.3045 -61.468194,-7.30377 -16.583846,-3.21169 -27.470922,-6.6589 -33.5609749,-10.62651 -5.693411,-3.70924 -5.6977634,-7.9672 -0.01198,-11.76202 10.5083219,-7.01354 39.0416119,-13.02717 79.1049899,-16.67199 40.0625,-3.64479 86.24899,-4.40797 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