0
我遵循以下D3示例：http://bl.ocks.org/mbostock/1667367。在這個例子中，有一個焦點和一個上下文。當上下文更改時，焦點將顯示上下文中的數據。我的目標是增加另一個焦點（focus2）。爲了更容易，focus2（此刻）的功能與焦點（原始焦點）相同。預期的結果是：當畫筆移動時，兩個焦點（代碼中的focus和focus2）將會改變。下面是代碼：D3，當情景發生變化時，第二焦點不移動
<!DOCTYPE html>
<meta charset="utf-8">
<!--head> \t
\t <link rel="stylesheet" type= "text/css" href="angle_view.css">
</head-->
<style>
svg {
font: 10px sans-serif;
}
.area {
fill: steelblue;
clip-path: url(#clip);
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.brush .extent {
stroke: #fff;
fill-opacity: .125;
shape-rendering: crispEdges;
}
</style>
<body>
\t <!--script type = "text/javascript" src = "../d3/d3.min.js"> </script-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.3.7/d3.min.js"></script>
\t
\t <p>Select a dataset from the list.</p>
\t <select id = "datasetSelect" onchange = "datasetSelectFunction()">
\t <option value="load_small_data_set">small dataset</option>
\t <option value="load_whole_data_set">whole dataset</option> \t
\t </select>
\t
\t <!--script type = "text/javascript" src = "angle_view.js"> </script -->
\t
\t <script> \t
\t
\t // main script
\t var g_fn = null;
\t var g_pan = null;
\t var g_feature = null;
\t var g_fn_pan = null;
\t
// \t init_angle_feature_view();
\t var margin = {top: 10, right: 30, bottom: 370, left: 40};
\t var margin2 = {top: 250, right: 30, bottom: 130, left: 40};
\t var margin3 = {top: 500, right: 30, bottom: 20, left: 40};
\t var width = 960 - margin.left - margin.right;
\t var height = 600 - margin.top - margin.bottom;
\t var height2 = 600 - margin2.top - margin2.bottom;
\t var height3 = 600 - margin3.top - margin3.bottom;
\t // set scales
\t var x = d3.scale.linear().range([0, width]);
\t var x2 = d3.scale.linear().range([0, width]);
\t var x3 = d3.scale.linear().range([0, width]);
\t var y = d3.scale.linear().range([height, 0]);
\t var y2 = d3.scale.linear().range([height2, 0]);
\t var y3 = d3.scale.linear().range([height3, 0]);
\t var xAxis = d3.svg.axis().scale(x).orient("bottom");
\t var xAxis2 = d3.svg.axis().scale(x2).orient("bottom");
\t var xAxis3 = d3.svg.axis().scale(x3).orient("bottom");
\t var yAxis = d3.svg.axis().scale(y).orient("left");
\t var brush = d3.svg.brush()
\t .x(x3) // x scale
\t .on("brush", brushed);
\t var area = d3.svg.area() // area on the top, detailed view of pan angle
\t .interpolate("monotone")
\t .x(function(d) { return x(d.frame_number); })
\t .y0(height)
\t .y1(function(d) { return y(d.pan); });
\t
\t var area2 = d3.svg.area() // area in the middle, detailed view of feature
\t \t .interpolate("monotone")
\t \t .x(function(d){return x2(d.frame_number);})
\t \t .y0(height2)
\t \t .y1(function(d){return y2(d.pan); });
\t var area3 = d3.svg.area() // area on the bottom, global view of pan angle
\t .interpolate("monotone")
\t .x(function(d) { return x3(d.frame_number); })
\t .y0(height3)
\t .y1(function(d) { return y3(d.pan); });
\t var svg = d3.select("body").append("svg")
\t .attr("width", width + margin.left + margin.right)
\t .attr("height", height + margin.top + margin.bottom);
\t svg.append("defs").append("clipPath") // what is defs?, defs is not directly rendered. what is clipPath? draw only inside width x height
\t .attr("id", "clip") // what is clip and id do
\t .append("rect")
\t .attr("width", width)
\t .attr("height", height);
\t var focus = svg.append("g")
\t .attr("class", "focus") // where does focus come from?
\t .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
\t
\t var focus2 = svg.append("g")
\t \t .attr("class", "focus")
\t \t .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
\t var context = svg.append("g")
\t .attr("class", "context")
\t .attr("transform", "translate(" + margin3.left + "," + margin3.top + ")"); \t
\t
\t function datasetSelectFunction(){
\t \t var x = document.getElementById("datasetSelect").value; \t
\t \t //console.log(x);
\t \t
\t \t if (x == "load_small_data_set")
\t \t {
\t \t \t // load frame number, pan data \t \t \t
\t \t \t d3.csv("https://dl.dropboxusercontent.com/u/54750216/javascript/sampled_fn_pan_small.csv", function(error, data) {
\t \t \t \t if (error) throw error;
\t \t \t \t // sparse data \t \t \t
\t \t \t \t data.forEach(function(d){
\t \t \t \t \t d.frame_number = parseInt(d.frame_number);
\t \t \t \t \t d.pan = parseFloat(d.pan); \t \t \t \t \t
\t \t \t \t });
\t \t \t \t g_fn_pan = data;
\t \t \t
\t \t \t d3.csv("https://dl.dropboxusercontent.com/u/54750216/javascript/sampled_fn_dim_feature_small.csv", function(error, feature) {
\t \t \t if (error) throw error;
\t \t \t // Coerce the CSV data to the appropriate types.
\t \t \t feature.forEach(function(d) {
\t \t \t d.fn = parseInt(d.frame_number);
\t \t \t d.dim = parseInt(d.dim);
\t \t \t d.feature = parseFloat(d.feature);
\t \t \t });
\t \t \t g_feature = feature;
\t \t \t
\t \t \t angle_feature_view(g_fn_pan, g_feature); \t \t \t
\t \t \t }); \t \t
\t \t \t
\t \t \t });
\t \t \t console.log("load_small_data_set"); \t \t \t \t
\t \t \t // load frame number, feature data \t \t \t \t \t
\t \t \t \t
\t \t }
\t \t else if (x == "load_whole_data_set")
\t \t {
\t \t \t // load frame number, pan data \t \t \t
\t \t \t d3.csv("sampled_data/sampled_fn_pan.csv", function(error, data) {
\t \t \t \t if (error) throw error;
\t \t \t \t // sparse data \t \t \t
\t \t \t \t data.forEach(function(d){
\t \t \t \t \t d.frame_number = parseInt(d.frame_number);
\t \t \t \t \t d.pan = parseFloat(d.pan); \t \t \t \t \t
\t \t \t \t });
\t \t \t \t g_fn_pan = data;
\t \t \t
\t \t \t d3.csv("sampled_data/sampled_fn_dim_feature.csv", function(error, feature) {
\t \t \t if (error) throw error;
\t \t \t // Coerce the CSV data to the appropriate types.
\t \t \t feature.forEach(function(d) {
\t \t \t d.fn = parseInt(d.frame_number);
\t \t \t d.dim = parseInt(d.dim);
\t \t \t d.feature = parseFloat(d.feature);
\t \t \t });
\t \t \t g_feature = feature;
\t \t \t
\t \t \t // angle_feature_view(g_fn_pan, g_feature); \t \t \t
\t \t \t }); \t \t
\t \t \t
\t \t \t });
\t \t \t console.log("load_whole_data_set");
\t \t } \t \t
\t }
\t
\t // visualize frame number, pan angle and feature
\t function angle_feature_view(fn_pan, feature)
\t {
\t \t var fn_min = d3.min(fn_pan, function(d){return d.frame_number});
\t var fn_max = d3.max(fn_pan, function(d){return d.frame_number});
\t \t var pan_min = d3.min(fn_pan, function(d){return d.pan});
\t \t var pan_max = d3.max(fn_pan, function(d){return d.pan});
\t \t x.domain([fn_min, fn_max]);
\t \t y.domain([pan_min, pan_max]); \t
\t \t
\t \t x2.domain(x.domain());
\t \t y2.domain(y.domain());
\t \t // bottom
\t \t x3.domain(x.domain());
\t \t y3.domain(y.domain());
\t \t // draw fn pan detail view
\t \t
\t \t focus.append("path")
\t \t .datum(fn_pan)
\t \t .attr("class", "area")
\t \t .attr("d", area);
\t \t focus.append("g")
\t .attr("class", "x axis")
\t .attr("transform", "translate(0," + height + ")")
\t .call(xAxis);
\t \t focus.append("g")
\t .attr("class", "y axis")
\t .call(yAxis); \t \t
\t \t
\t \t // add focus2 in this place
\t \t focus2.append("path")
\t .datum(fn_pan)
\t .attr("class", "area")
\t .attr("d", area2);
\t focus2.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
\t \t focus2.append("g")
\t \t .attr("class", "y axis")
\t \t .call(yAxis);
\t \t // brush?
\t \t context.append("path")
\t \t .datum(fn_pan)
\t \t .attr("class", "area")
\t \t .attr("d", area3);
\t \t context.append("g")
\t .attr("class", "x axis")
\t .attr("transform", "translate(0," + height3 + ")")
\t .call(xAxis3);
\t \t context.append("g")
\t .attr("class", "x brush")
\t .call(brush)
\t .selectAll("rect")
\t .attr("y", -6)
\t .attr("height", height3 + 7); \t \t
\t }
\t
\t function brushed() {
\t x.domain(brush.empty() ? x3.domain() : brush.extent());
\t focus.select(".area").attr("d", area);
\t focus.select(".x.axis").call(xAxis);
\t focus2.select(".area").attr("d", area2); // I add focus2 in this place
\t focus2.select(".x.axis").call(xAxis2);
\t console.log("call brushed");
\t } \t
\t
\t
\t </script>
\t
\t
</body> \t敬請關注焦點，FOCUS2和環境相關的領域。 問題是，當上下文更改時，focus2視圖不會更改。它總是顯示整個數據集。
請添加一些解釋。您的答案可能會被標記爲「低質量」，最終可能會被刪除。 –
感謝您的建議。我添加了一條線來解釋解決方案，但它非常簡單，沒有太多要添加真的... –
@JohannesJander，希望你不介意我問。我相信我正確回答了這個問題（雖然相當簡單）。接受答案需要什麼？我試圖在這裏獲得一些聲譽點。這完全取決於問這個問題的人嗎？如果他不再有興趣呢？對不起，因爲不合時宜 –