chart/line-chart.html at master · inkcarve/chart · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0" />
<meta name="format-detection" content="telephone=no">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
  <title>SVG D3.js - 座標軸 ( Axis ) - demo 4</title>
  <script src="js/jquery/jquery.min.js?v2.0.1" type="text/javascript"></script>
<script src="js/d3/d3.v3.min.js"></script>
</head>
<style>
body {
    font-family: Arial, "微软雅黑";
    padding: 15px;
}

#lineChart {
    width: 100%;
    position: relative;
}

#lineChart svg {
    width: 100%;
}

#lineChart .legend text {
    text-anchor: middle;
    font-size: 12px;
    fill: #999;
}

#lineChart .legend rect {
  fill:#fff;
}

#lineChart .axis-x-text text {
    text-anchor: middle;
    font-size: 14px;
    fill: #555;
}
</style>
<body>
  <div id="lineChart">
  </div>
  <script>

  //data 的 value 要先轉成數字
  var data = [{
            month: 11,
            value: 89123
        }, {
            month: 12,
            value: 12231
        }, {
            month: 1,
            value: 34561
        }, {
            month: 2,
            value: 100000
        }];

  var colors={
            dot: '#158e47',
            line: '#158e47',
            dashLine: '#84b49c'
        };

  var id="lineChart";
  var element=$("#lineChart");

  var nextMonth = data[data.length - 1].month + 1;
            var chart_W = 7; // 字元 width 拿來判斷文字寬度是否重疊

            //判斷最月份是否大於12，大於12則為1
            data.push({
                month: nextMonth>12 ? 1 : nextMonth,
                value: 0,
                last: true
            });

            var dataCount = data.length;

            function build() {

                var boxRatio = 3 / 7,
                    box_W = $(element).width(),
                    box_H = box_W * boxRatio,
                    chart_padding_X = 40;
                var text_H = 16;
                var text_padding_Y = 5;
                var circle_W = 3;
                var text_Box_H = text_H + text_padding_Y + circle_W / 2;
                var asix_X_Text_H = text_H + text_padding_Y;
                var chart_H = box_H - text_Box_H;
                console.log(box_W);
                // get maxY
                var maxY = 0;
                data.forEach(function(d, i) {
                    maxY = Math.max(d.value, maxY);
                });

                //創建svg
                var svg = d3.select('#' + id)
                    .append("svg")
                    .append("g").attr("class", "box");

                svg.append('g').attr('class', 'line');
                svg.append('g').attr('class', 'dot');
                svg.append('g').attr('class', 'legend');
                svg.append('g').attr('class', 'axis-x-text');

                $(element).find('svg').attr({
                    'width': box_W,
                    'height': box_H + text_padding_Y
                });
                svg.attr({
                    'transform': 'translate(0,' + (box_H - asix_X_Text_H) + ')'
                });

                var scaleX = d3.scale.linear()
                    .range([chart_padding_X, (box_W - chart_padding_X)])
                    .domain([0, dataCount - 1]);

                var scaleY = d3.scale.linear()
                    .range([0, (-chart_H + asix_X_Text_H)])
                    .domain([0, maxY]);

                    //建立X軸標示
                /*var axisX = d3.svg.axis()
                    .scale(scaleX)
                    .orient("bottom")
                    .ticks(10)
                    .tickFormat(function(d) {
                        return d + 'n';
                    });

                //建立Y軸標示
                var axisY = d3.svg.axis()
                    .scale(scaleY)
                    .orient("left")
                    .ticks(5)
                    .tickFormat(function(d) {
                        return d + '%';
                    });*/


                var line = svg.select('.line').selectAll('g').select('polyline').data(data);

                line.enter().append('polyline').attr({
                    'points': function(d, i) {
                        var pos = [];
                        var posX = scaleX(i);
                        var posY = scaleY(d.value);
                        pos[0] = posX;
                        pos[1] = posY;
                        data[i].pos = [posX, posY];
                        if (i == 0) {
                            return [
                                [0, 0], pos
                            ]
                        }
                        var lastIndex = i - 1;
                        var lastData = data[i - 1];
                        if (d.last !== undefined) {
                            return [
                                [scaleX(i - 1), scaleY(lastData.value)], pos, [box_W, 0]
                            ];
                        }
                        return [
                            [scaleX(i - 1), scaleY(lastData.value)], pos
                        ]

                    },
                    'stroke': function(d, i) {
                        return d.last ? colors.dashLine : colors.line
                    },
                    'stroke-dasharray': function(d, i) {
                        if (d.last !== undefined) {
                            return (5, 5);
                        }
                    },
                    'fill': 'none'
                        //折線圖也要套用 translate
                });

                var dot = svg.select('.dot').selectAll('g').data(data);

                dot.enter().append('circle').attr({
                    'transform': function(d, i) {
                        return 'translate(' + [d.pos[0], d.pos[1]] + ')';
                    },
                    'r': circle_W,
                    'fill': function(d, i) {
                        return d.last ? '#fff' : colors.dot
                    },
                    'stroke-width': '1px',
                    'stroke': function(d, i) {
                        return d.last ? colors.dashLine : colors.dot
                    }
                });

                var legend = svg.select('.legend').selectAll('g').data(data);
                legend.enter().append('g').attr('class', 'legend-g');
                legend.append('text').text(function(d) {
                    return d.value;
                }).attr({
                    'transform': function(d, i) {
                        var posY = d.pos[1] - text_Box_H / 2;
                        var posX = d.pos[0];
                        var width = d.value.toString().length * char_W;
                        if (posX - width / 2 - 4 <= 0) {
                            posX = posX - (posX - width / 2 - 4);
                        }
                        if (posX + width / 2 + 4 >= box_W) {
                            posX = posX - (posX + width / 2 + 4 - box_W);
                        }
                        if (i > 0) {
                            var lastData = data[i - 1];
                            var boxBottom = d.pos[1];
                            var boxTop = d.pos[1] - text_Box_H;
                            var lastBottom = lastData.legendPosY + text_Box_H / 2;
                            var lastTop = lastData.legendPosY - text_Box_H / 2;
                            if (d.pos[0] - 4 - width < lastData.pos[0]) {
                                if (boxBottom <= lastBottom && boxBottom >= lastTop) {
                                    posY = -posY > chart_H / 2 ? lastData.legendPosY + text_Box_H : lastData.legendPosY - text_Box_H;
                                }
                                if (boxTop <= lastBottom && boxTop >= lastTop) {
                                    posY = -posY > chart_H / 2 ? lastData.legendPosY + text_Box_H : lastData.legendPosY - text_Box_H;
                                }
                            }
                        }
                        data[i].legendPosY = posY;
                        return 'translate(' + [posX, posY] + ')';
                    }
                });

                var axis = svg.select('.axis-x-text').selectAll('g').data(data);

                axis.enter().append('text').text(function(d) {
                    return d.month + '月';
                }).attr({
                    'transform': function(d, i) {
                        return 'translate(' + [d.pos[0], asix_X_Text_H] + ')';
                    }
                });

            }
            build();

            $(window).resize(function(){
              $('#' + id).empty();
              build();
            });
  </script>
</body>

</html>