Мне нужно разработать компонент d3, подобный показанному на рисунке ниже.
Я сослался на существующий образец кода из эта ссылка и изменил его, чтобы создать что-то вроде этого.
Слева изменялась ширина оси, которую я пытался изменить, изменив свойство ширина штриха для класс домена. Однако я закончил примерно так.
Проблемы:
Вопросов:
Я использую для этого d3 v4. И jsfiddle для моего окончательный код здесь.
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<script src = "https://d3js.org/d3.v5.min.js"></script>
<style>
.tick{
visibility:hidden;
}
.domain {
stroke: grey;
stroke-width:10px;
stroke-linecap: round;
}
.selection {
fill:red
}
</style>
</head>
<body>
<div style = "margin-left: 20px;margin-top: 20px;">
<span></span> to <span></span>
</div>
<script>
var margin = 20,
width = 400 - margin * 2,
height = 15;
// v3 = var x = d3.scale.linear()
var x = d3.scaleLinear()
.domain([0,100])
.range([0, width]);
/*
var brush = d3.svg.brush()
.x(x)
.extent([20, 50]);
*/
var brush = d3.brushX()
.extent([[0,0], [width,height]])
.on("brush", brushed);
var svg = d3.select("body").append("svg")
.attr("width", width + margin * 2)
.attr("height", 100)
.append("g")
.attr("transform", "translate(" + margin + "," + margin + ")")
.call(d3.axisBottom()
.scale(x)
.tickSize(0));
var brushg = svg.append("g")
.attr("class", "brush")
.call(brush)
// left circle
var left_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
var right_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
/*
Height of the brush's rect is now
generated by brush.extent():
brushg.selectAll("rect")
.attr("height", height);
*/
function brushed() {
/*
The brush attributes are no longer stored
in the brush itself, but rather in the
element it is brushing. That's where much of
the confusion around v4's brushes seems to be.
The new method is a little difficult to adapt
to, but seems more efficient. I think much of
this confusion comes from the fact that
brush.extent() still exists, but means
something completely different.
Instead of calling brush.extent() to get the
range of the brush, call
d3.brushSelection(node) on what is being
brushed.
d3.select('#start-number')
.text(Math.round(brush.extent()[0]));
d3.select('#end-number')
.text(Math.round(brush.extent()[1]));
*/
var range = d3.brushSelection(this)
.map(x.invert);
console.info('range->'+range)
d3.selectAll("span")
.text(function(d, i) {
console.info(Math.round(range[i]))
return Math.round(range[i])
})
left_text.attr("x", x(range[0]));
left_text.text(Math.round(range[0]));
right_text.attr("x", x(range[1]));
right_text.text(Math.round(range[1]));
d3.selectAll("rect").attr("dy", "-5em")
}
// v3: brushed();
brush.move(brushg, [20, 40].map(x));
</script>
</body>
</html>


![Безумие обратных вызовов в javascript [JS]](https://i.imgur.com/WsjO6zJb.png)


Ось и кисть на самом деле идеально выровнены!
Вы можете увидеть это, если установите для stroke-width значение 1px:
.as-console-wrapper { max-height: 30% !important;}<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<script src = "https://d3js.org/d3.v5.min.js"></script>
<style>
.tick{
visibility:hidden;
}
.domain {
stroke: grey;
stroke-width:1px;
stroke-linecap: round;
}
.selection {
fill:red
}
</style>
</head>
<body>
<div style = "margin-left: 20px;margin-top: 20px;">
<span></span> to <span></span>
</div>
<script>
var margin = 20,
width = 400 - margin * 2,
height = 15;
// v3 = var x = d3.scale.linear()
var x = d3.scaleLinear()
.domain([0,100])
.range([0, width]);
/*
var brush = d3.svg.brush()
.x(x)
.extent([20, 50]);
*/
var brush = d3.brushX()
.extent([[0,0], [width,height]])
.on("brush", brushed);
var svg = d3.select("body").append("svg")
.attr("width", width + margin * 2)
.attr("height", 100)
.append("g")
.attr("transform", "translate(" + margin + "," + margin + ")")
.call(d3.axisBottom()
.scale(x)
.tickSize(0));
var brushg = svg.append("g")
.attr("class", "brush")
.call(brush)
// left circle
var left_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
var right_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
/*
Height of the brush's rect is now
generated by brush.extent():
brushg.selectAll("rect")
.attr("height", height);
*/
function brushed() {
/*
The brush attributes are no longer stored
in the brush itself, but rather in the
element it is brushing. That's where much of
the confusion around v4's brushes seems to be.
The new method is a little difficult to adapt
to, but seems more efficient. I think much of
this confusion comes from the fact that
brush.extent() still exists, but means
something completely different.
Instead of calling brush.extent() to get the
range of the brush, call
d3.brushSelection(node) on what is being
brushed.
d3.select('#start-number')
.text(Math.round(brush.extent()[0]));
d3.select('#end-number')
.text(Math.round(brush.extent()[1]));
*/
var range = d3.brushSelection(this)
.map(x.invert);
console.info('range->'+range)
d3.selectAll("span")
.text(function(d, i) {
console.info(Math.round(range[i]))
return Math.round(range[i])
})
left_text.attr("x", x(range[0]));
left_text.text(Math.round(range[0]));
right_text.attr("x", x(range[1]));
right_text.text(Math.round(range[1]));
d3.selectAll("rect").attr("dy", "-5em")
}
// v3: brushed();
brush.move(brushg, [20, 40].map(x));
</script>
</body>
</html>Итак, что здесь происходит? Проблема в том, что когда вы говорите браузеру взять линию (в данном случае это путь, но это не имеет значения) и увеличить ее ход, скажем, до 100 пикселей, он увеличит 50 пикселей в одну сторону и 50 пикселей. пикселей на другую сторону. Итак, середина этой толстой оси находится прямо над прямоугольником кисти.
Здесь есть несколько решений, например, нарисовать прямоугольник. Если, однако, вы хотите сохранить свой подход к увеличению ширины штриха .domain, давайте разберем выделение и переместим ось на половину ее stroke-width вниз (здесь я увеличиваю ширину до 20 пикселей, чтобы было легче увидеть выравнивание). :
.as-console-wrapper { max-height: 30% !important;}<!DOCTYPE html>
<meta charset = "utf-8">
<script src = "//d3js.org/d3.v4.min.js"></script>
<!--
axes and brushes are styled out of the box,
so this is no longer needed
<style>
.axis path, .axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.brush .extent {
fill-opacity: .125;
shape-rendering: crispEdges;
}
</style>
-->
<style>
.tick {
visibility: hidden;
}
.domain {
stroke: grey;
stroke-width: 20px;
stroke-linecap: round;
}
.selection {
fill: red
}
</style>
<body>
<div style = "margin-left: 20px;margin-top: 20px;">
<span></span> to <span></span>
</div>
</body>
<script>
var margin = 20,
width = 400 - margin * 2,
height = 20;
// v3 = var x = d3.scale.linear()
var x = d3.scaleLinear()
.domain([0, 100])
.range([0, width]);
/*
var brush = d3.svg.brush()
.x(x)
.extent([20, 50]);
*/
var brush = d3.brushX()
.extent([
[0, 0],
[width, height]
])
.on("brush", brushed);
var svg = d3.select("body").append("svg")
.attr("width", width + margin * 2)
.attr("height", 100);
svg.append("g")
.attr("transform", "translate(" + margin + "," + (margin + 10) + ")")
.call(d3.axisBottom()
.scale(x)
.tickSize(0));
var brushg = svg.append("g")
.attr("transform", "translate(" + margin + "," + margin + ")")
.attr("class", "brush")
.call(brush)
// left circle
var left_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
var right_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
/*
Height of the brush's rect is now
generated by brush.extent():
brushg.selectAll("rect")
.attr("height", height);
*/
function brushed() {
/*
The brush attributes are no longer stored
in the brush itself, but rather in the
element it is brushing. That's where much of
the confusion around v4's brushes seems to be.
The new method is a little difficult to adapt
to, but seems more efficient. I think much of
this confusion comes from the fact that
brush.extent() still exists, but means
something completely different.
Instead of calling brush.extent() to get the
range of the brush, call
d3.brushSelection(node) on what is being
brushed.
d3.select('#start-number')
.text(Math.round(brush.extent()[0]));
d3.select('#end-number')
.text(Math.round(brush.extent()[1]));
*/
var range = d3.brushSelection(this)
.map(x.invert);
console.info('range->' + range)
d3.selectAll("span")
.text(function(d, i) {
console.info(Math.round(range[i]))
return Math.round(range[i])
})
left_text.attr("x", x(range[0]));
left_text.text(Math.round(range[0]));
right_text.attr("x", x(range[1]));
right_text.text(Math.round(range[1]));
d3.selectAll("rect").attr("dy", "-5em")
}
// v3: brushed();
brush.move(brushg, [20, 40].map(x));
</script>Путь на оси представляет собой замкнутую форму, и обводка создает проблемы. Также вам не нужны галочки, так почему бы не нарисовать «ось» самостоятельно. Тогда округлый край будет нарисован правильно.
var svg = d3.select("body").append("svg")
.attr("width", width + margin * 2)
.attr("height", 100)
.append("g")
.attr("transform", "translate(" + margin + "," + margin + ")")
// .call(d3.axisBottom()
// .scale(x)
// .tickSize(0))
;
svg.append("path")
.attr("class", "domain")
.attr("d", `M${x(0)},0 ${x(100)},0`);
Вы должны сопоставить экстент кисти с обведенной поверхностью контура.
var margin = 20,
width = 400 - margin * 2,
height = 10; // same as stroke width
var brush = d3.brushX()
.extent([[0,-height*0.5], [width,height*0.5]])
.on("brush", brushed);
Атрибут dy не имеет цели
//d3.selectAll("rect").attr("dy", "-5em")
Установите непрозрачность заливки выделения
.selection {
fill:red;
fill-opacity: 1;
}
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<script src = "https://d3js.org/d3.v5.min.js"></script>
<style>
.tick{
visibility:hidden;
}
.domain {
stroke: grey;
stroke-width:10;
stroke-linecap: round;
}
.selection {
fill:red;
fill-opacity: 1;
}
</style>
</head>
<body>
<div style = "margin-left: 20px;margin-top: 20px;">
<span></span> to <span></span>
</div>
<script>
var margin = 20,
width = 400 - margin * 2,
height = 10; // same as stroke width
// v3 = var x = d3.scale.linear()
var x = d3.scaleLinear()
.domain([0,100])
.range([0, width]);
/*
var brush = d3.svg.brush()
.x(x)
.extent([20, 50]);
*/
var brush = d3.brushX()
.extent([[0,-height*0.5], [width,height*0.5]])
.on("brush", brushed);
var svg = d3.select("body").append("svg")
.attr("width", width + margin * 2)
.attr("height", 100)
.append("g")
.attr("transform", "translate(" + margin + "," + margin + ")")
// .call(d3.axisBottom()
// .scale(x)
// .tickSize(0))
;
svg.append("path")
.attr("class", "domain")
.attr("d", `M${x(0)},0 ${x(100)},0`);
var brushg = svg.append("g")
.attr("class", "brush")
.call(brush)
// left circle
var left_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
var right_text = brushg.append("text")
.attr("class", "label")
.attr("fill", "black")
.attr("text-anchor", "middle")
.text("hello world")
.attr("transform", "translate(0," + (35) + ")")
/*
Height of the brush's rect is now
generated by brush.extent():
brushg.selectAll("rect")
.attr("height", height);
*/
function brushed() {
/*
The brush attributes are no longer stored
in the brush itself, but rather in the
element it is brushing. That's where much of
the confusion around v4's brushes seems to be.
The new method is a little difficult to adapt
to, but seems more efficient. I think much of
this confusion comes from the fact that
brush.extent() still exists, but means
something completely different.
Instead of calling brush.extent() to get the
range of the brush, call
d3.brushSelection(node) on what is being
brushed.
d3.select('#start-number')
.text(Math.round(brush.extent()[0]));
d3.select('#end-number')
.text(Math.round(brush.extent()[1]));
*/
var range = d3.brushSelection(this)
.map(x.invert);
//console.info('range->'+range)
d3.selectAll("span")
.text(function(d, i) {
//console.info(Math.round(range[i]))
return Math.round(range[i])
})
left_text.attr("x", x(range[0]));
left_text.text(Math.round(range[0]));
right_text.attr("x", x(range[1]));
right_text.text(Math.round(range[1]));
//d3.selectAll("rect").attr("dy", "-5em")
}
// v3: brushed();
brush.move(brushg, [20, 40].map(x));
</script>
</body>
</html>