自动缩放并在dimple.js中格式化x轴

时间:2014-08-07 16:39:55

标签: javascript d3.js dimple.js

我想要一个根据数据大小自动缩放x轴并仅显示特定数字的图表,而其余数据点仅显示没有数字的刻度线。像这样:

x-axis

在此示例中,数据的长度介于75和155之间,因此它显示数字的倍数20.然后,对于每个间隔,有5个等间距的刻度线。

到目前为止,我已经能够使用此处建议的cleanAxis函数编辑刻度:How do you reduce the number of Y-axis ticks in dimple.js?。我为缩放轴做了类似的事情:

    if (data.length < 10) {
        cleanAxis(myAxis, 2);
    }
    if (data.length >= 10 && data.length < 75) {
        cleanAxis(myAxis, 10);
    }
    if (data.length >= 75 && data.length < 155) {
        cleanAxis(myAxis, 20);
    }
    if (data.length >= 155) {
        cleanAxis(myAxis, 50);
    }

这显示了我想要的数字,但也删除了刻度线。是否可以在dimple.js中做我想做的事?

1 个答案:

答案 0 :(得分:3)

供参考,这里是cleanTicks函数,由@JohnKiernander提供。

// Pass in an axis object and an interval.
var cleanAxis = function (axis, oneInEvery) {
    // This should have been called after draw, otherwise do nothing
    if (axis.shapes.length > 0) {
        // Leave the first label
        var del = 0;
        // If there is an interval set
        if (oneInEvery > 1) {
            // Operate on all the axis text
            axis.shapes.selectAll("text").each(function (d) {
                // Remove all but the nth label
                if (del % oneInEvery !== 0) {
                    this.remove();
                    // Find the corresponding tick line and remove
                    axis.shapes.selectAll("line").each(function (d2) {
                        if (d === d2) {
                            this.remove();
                        }
                    });
                }
            del += 1;
            });
        }
    }
};

删除行的部分位于:

// Find the corresponding tick line and remove
axis.shapes.selectAll("line").each(function (d2) {
    if (d === d2) {
        this.remove();
    }
});

所以如果你想要不那么频繁地删除它,你可以做另一个模数检查:

var cleanAxis = function (axis, labelEvery, tickEvery) {
    // This should have been called after draw, otherwise do nothing
    if (axis.shapes.length > 0) {
        // If there is an interval set
        if (labelEvery > 1) {
            // Operate on all the axis text
            axis.shapes.selectAll("text").each(function (d, i) {
                // Remove all but the nth label
                if (i % labelEvery !== 0) {
                    this.remove();
                }
                if (i % tickEvery !== 0) {
                    // Find the corresponding tick line and remove
                    axis.shapes.selectAll("line").each(function (d2) {
                        if (d === d2) {
                            this.remove();
                        }
                    });
                }
            });
        }
    }
};