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Pass data object to operations

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This commit is contained in:
Tim Schaub
2015-06-25 17:32:34 -06:00
parent 5267776627
commit 65fee5b7ac
4 changed files with 47 additions and 24 deletions
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28
examples/raster.js
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@@ -7,7 +7,7 @@ goog.require('ol.layer.Tile');
goog.require('ol.source.BingMaps');
goog.require('ol.source.Raster');
function tgi(pixels) {
function tgi(pixels, data) {
var pixel = pixels[0];
var r = pixel[0] / 255;
var g = pixel[1] / 255;
@@ -17,20 +17,17 @@ function tgi(pixels) {
return pixels;
}
var counts = new Counts(0, 25);
function summarize(pixels) {
function summarize(pixels, data) {
var value = pixels[0][0];
counts.increment(value);
data.counts.increment(value);
return pixels;
}
var threshold = 10;
function color(pixels) {
function color(pixels, data) {
var pixel = pixels[0];
var value = pixel[0];
if (value > threshold) {
if (value > data.threshold) {
pixel[0] = 0;
pixel[1] = 255;
pixel[2] = 0;
@@ -51,12 +48,17 @@ var raster = new ol.source.Raster({
operations: [tgi, summarize, color]
});
raster.on('beforeoperations', function() {
var counts = new Counts(0, 25);
var threshold = 10;
raster.on('beforeoperations', function(event) {
counts.clear();
event.data.counts = counts;
event.data.threshold = threshold;
});
raster.on('afteroperations', function(event) {
schedulePlot(event.resolution);
schedulePlot(event.resolution, event.data.counts);
});
var map = new ol.Map({
@@ -114,12 +116,12 @@ Counts.prototype.increment = function(value) {
};
var timer = null;
function schedulePlot(resolution) {
function schedulePlot(resolution, counts) {
if (timer) {
clearTimeout(timer);
timer = null;
}
timer = setTimeout(plot.bind(null, resolution), 1000 / 60);
timer = setTimeout(plot.bind(null, resolution, counts), 1000 / 60);
}
var barWidth = 15;
@@ -133,7 +135,7 @@ var chartRect = chart[0][0].getBoundingClientRect();
var tip = d3.select(document.body).append('div')
.attr('class', 'tip');
function plot(resolution) {
function plot(resolution, counts) {
var yScale = d3.scale.linear()
.domain([0, d3.max(counts.values)])
.range([0, plotHeight]);