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Current File : /home/amvm/public_html/bhadaur/myadmin/plugins/flot/jquery.flot.image.js
/* Flot plugin for plotting images. Copyright (c) 2007-2013 IOLA and Ole Laursen. Licensed under the MIT license. The data syntax is [ [ image, x1, y1, x2, y2 ], ... ] where (x1, y1) and (x2, y2) are where you intend the two opposite corners of the image to end up in the plot. Image must be a fully loaded Javascript image (you can make one with new Image()). If the image is not complete, it's skipped when plotting. There are two helpers included for retrieving images. The easiest work the way that you put in URLs instead of images in the data, like this: [ "myimage.png", 0, 0, 10, 10 ] Then call $.plot.image.loadData( data, options, callback ) where data and options are the same as you pass in to $.plot. This loads the images, replaces the URLs in the data with the corresponding images and calls "callback" when all images are loaded (or failed loading). In the callback, you can then call $.plot with the data set. See the included example. A more low-level helper, $.plot.image.load(urls, callback) is also included. Given a list of URLs, it calls callback with an object mapping from URL to Image object when all images are loaded or have failed loading. The plugin supports these options: series: { images: { show: boolean anchor: "corner" or "center" alpha: [ 0, 1 ] } } They can be specified for a specific series: $.plot( $("#placeholder"), [{ data: [ ... ], images: { ... } ]) Note that because the data format is different from usual data points, you can't use images with anything else in a specific data series. Setting "anchor" to "center" causes the pixels in the image to be anchored at the corner pixel centers inside of at the pixel corners, effectively letting half a pixel stick out to each side in the plot. A possible future direction could be support for tiling for large images (like Google Maps). */ (function ($) { var options = { series: { images: { show: false, alpha: 1, anchor: "corner" // or "center" } } }; $.plot.image = {}; $.plot.image.loadDataImages = function (series, options, callback) { var urls = [], points = []; var defaultShow = options.series.images.show; $.each(series, function (i, s) { if (!(defaultShow || s.images.show)) return; if (s.data) s = s.data; $.each(s, function (i, p) { if (typeof p[0] == "string") { urls.push(p[0]); points.push(p); } }); }); $.plot.image.load(urls, function (loadedImages) { $.each(points, function (i, p) { var url = p[0]; if (loadedImages[url]) p[0] = loadedImages[url]; }); callback(); }); }; $.plot.image.load = function (urls, callback) { var missing = urls.length, loaded = {}; if (missing == 0) callback({}); $.each(urls, function (i, url) { var handler = function () { --missing; loaded[url] = this; if (missing == 0) callback(loaded); }; $('<img />').load(handler).error(handler).attr('src', url); }); }; function drawSeries(plot, ctx, series) { var plotOffset = plot.getPlotOffset(); if (!series.images || !series.images.show) return; var points = series.datapoints.points, ps = series.datapoints.pointsize; for (var i = 0; i < points.length; i += ps) { var img = points[i], x1 = points[i + 1], y1 = points[i + 2], x2 = points[i + 3], y2 = points[i + 4], xaxis = series.xaxis, yaxis = series.yaxis, tmp; // actually we should check img.complete, but it // appears to be a somewhat unreliable indicator in // IE6 (false even after load event) if (!img || img.width <= 0 || img.height <= 0) continue; if (x1 > x2) { tmp = x2; x2 = x1; x1 = tmp; } if (y1 > y2) { tmp = y2; y2 = y1; y1 = tmp; } // if the anchor is at the center of the pixel, expand the // image by 1/2 pixel in each direction if (series.images.anchor == "center") { tmp = 0.5 * (x2-x1) / (img.width - 1); x1 -= tmp; x2 += tmp; tmp = 0.5 * (y2-y1) / (img.height - 1); y1 -= tmp; y2 += tmp; } // clip if (x1 == x2 || y1 == y2 || x1 >= xaxis.max || x2 <= xaxis.min || y1 >= yaxis.max || y2 <= yaxis.min) continue; var sx1 = 0, sy1 = 0, sx2 = img.width, sy2 = img.height; if (x1 < xaxis.min) { sx1 += (sx2 - sx1) * (xaxis.min - x1) / (x2 - x1); x1 = xaxis.min; } if (x2 > xaxis.max) { sx2 += (sx2 - sx1) * (xaxis.max - x2) / (x2 - x1); x2 = xaxis.max; } if (y1 < yaxis.min) { sy2 += (sy1 - sy2) * (yaxis.min - y1) / (y2 - y1); y1 = yaxis.min; } if (y2 > yaxis.max) { sy1 += (sy1 - sy2) * (yaxis.max - y2) / (y2 - y1); y2 = yaxis.max; } x1 = xaxis.p2c(x1); x2 = xaxis.p2c(x2); y1 = yaxis.p2c(y1); y2 = yaxis.p2c(y2); // the transformation may have swapped us if (x1 > x2) { tmp = x2; x2 = x1; x1 = tmp; } if (y1 > y2) { tmp = y2; y2 = y1; y1 = tmp; } tmp = ctx.globalAlpha; ctx.globalAlpha *= series.images.alpha; ctx.drawImage(img, sx1, sy1, sx2 - sx1, sy2 - sy1, x1 + plotOffset.left, y1 + plotOffset.top, x2 - x1, y2 - y1); ctx.globalAlpha = tmp; } } function processRawData(plot, series, data, datapoints) { if (!series.images.show) return; // format is Image, x1, y1, x2, y2 (opposite corners) datapoints.format = [ { required: true }, { x: true, number: true, required: true }, { y: true, number: true, required: true }, { x: true, number: true, required: true }, { y: true, number: true, required: true } ]; } function init(plot) { plot.hooks.processRawData.push(processRawData); plot.hooks.drawSeries.push(drawSeries); } $.plot.plugins.push({ init: init, options: options, name: 'image', version: '1.1' }); })(jQuery);
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