我正在研究一個網絡工具,該工具應該創建一個給定數據的散點圖。由於我對任何可視化都不熟悉(也不是JavaScript專家),所以我決定使用D3。D3放大畫筆範圍
以下教程,觀察示例和嘗試的東西我得到一個散點圖與刷選擇(它什麼都沒做)。 現在,因爲目標是繪製基因,所以它們中的許多將在x和y座標方面彼此非常接近。所以我想實現一些東西like this,但在x和y方向。基本上放大拉絲部分。
到目前爲止,我無法創建此行爲,此時我的座標軸確實發生了變化,但不再顯示值,也沒有發生縮放。你可以在my toy subdomain上看到它。我不確定它出錯的地方,所以任何幫助表示讚賞。
在玩具領域中使用的JavaScript:
// General variables
var svg, width, height;
var padding = 30;
var dataset = [
[ 5, 20 ],
[ 480, 90 ],
[ 250, 50 ],
[ 100, 33 ],
[ 330, 95 ],
[ 410, 12 ],
[ 475, 44 ],
[ 25, 67 ],
[ 85, 21 ],
[ 220, 88 ]
];
function drawGraph(){
scatterplot_area_size = $("#scatterplot").width();
width = scatterplot_area_size;
height = scatterplot_area_size * 0.75;
console.log(width);
// Retrieve the interval of the x and y data
var maxX = d3.max(dataset, function(d) {
return d[0]; //References first value in each sub-array
});
var minX = d3.min(dataset, function(d) {
return d[0]; //References first value in each sub-array
});
var maxY = d3.max(dataset, function(d) {
return d[1]; //References second value in each sub-array
});
var minY = d3.min(dataset, function(d) {
return d[1]; //References second value in each sub-array
});
// Create a (square) scatterplot area in the div with id scatterplot
// which spans the entire div in width
svg = d3.select("#scatterplot")
.append("svg")
.attr("width", width)
.attr("height", height);
// plot all points
var points = svg.append("g")
.attr("class", "point")
.selectAll("point")
.data(dataset)
.enter()
.append("circle");
console.log(minX + " " + minY);
// Create x and y scales
var x = d3.scale.linear()
.domain([minX, maxX])
.range([padding, (width-padding)]);
var y = d3.scale.linear()
.domain([minY, maxY])
.range([(height-padding), padding]); // Reverse the scale to let high values show at the top and low values at the bottom
// Set the x and y positions as well as the radius (hard coded 5)
points.attr("cx", function(d) {
return x(d[0]);
})
.attr("cy", function(d) {
return y(d[1]);
})
.attr("r", 5);
// Create the x and y axes
var xAxis = d3.svg.axis()
.scale(x)
.ticks(10)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.ticks(10)
.orient("left");
// Add the axes to the scatterplot
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (height-padding) + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + padding + ",0)")
.call(yAxis);
// Allow for brushing (selection of points)
var brush = d3.svg.brush()
.x(x)
.y(y)
.on("brush", brushmove)
.on("brushend", brushend);
svg.append("g")
.attr("class", "brush")
.call(brush)
.selectAll('rect')
.attr('height', height);
function brushmove() {
var extent = brush.extent();
points.classed("selected", function(d) {
return extent[0][0] <= d[0] && d[0] <= extent[1][0]
&& extent[0][1] <= d[1] && d[1] <= extent[1][1];
});
}
function brushend() {
x.domain(brush.extent());
y.domain(brush.extent());
transition_data();
reset_axis();
points.classed("selected", false);
d3.select(".brush").call(brush.clear());
}
function transition_data() {
console.log("transistion data called");
d3.selectAll("point")
.transition()
.duration(500)
.attr("cx", function(d) { console.log(d[0]); return x(d[0]); })
.attr("cy", function(d) { return y(d[1]); });
}
function reset_axis() {
svg.transition().duration(500)
.select(".x.axis")
.call(xAxis);
svg.transition().duration(500)
.select(".y.axis")
.call(yAxis);
}
}
// Wait until the document is loaded, then draw the graph.
$(document).ready(function() {
drawGraph();
});
// If the window is resized, redraw graph to make it fit again.
$(window).resize(function() {
if(typeof svg != 'undefined'){
$("#scatterplot").empty();
}
drawGraph();
});
您是否收到任何錯誤消息? –
不,我的控制檯顯示沒有錯誤或警告 – Gooey