--- /dev/null
+/* 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);
Code Review / stor4nfv.git / blobdiff