1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | /* Flot plugin for plotting images, e.g. useful for putting ticks on a prerendered complex visualization. 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 ["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. Options for the plugin are series: { images: { show: boolean anchor: "corner" or "center" alpha: [0,1] } } which 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); |