Chart.js 雷达标签坐标

问题描述

有什么方法可以获取雷达图中标签的坐标吗?我正在尝试在标签区域中放置图像而不是文本.

is there any way to get the coordinates for the labels in the radar chart? I'm trying to put images instead of text in the labels area.

推荐答案

您可以使用 scale 属性计算它.这是动画完成后在这些点上绘制一个蓝色圆圈的东西.

You can calculate it using the scale property. Here is something that draws a blue circle at those points after the animation completes.

onAnimationComplete: function () {
    for (var i = 0; i < this.scale.valuesCount; i++) {
        // get the poitn position
        var pointLabelPosition = this.scale.getPointPosition(i, this.scale.calculateCenterOffset(this.scale.max) + 5);

        // draw a circle at that point
        this.chart.ctx.beginPath();
        this.chart.ctx.arc(pointLabelPosition.x, pointLabelPosition.y, 5, 0, 2 * Math.PI, false);
        this.chart.ctx.fillStyle = '#77e';
        this.chart.ctx.fill();
        this.chart.ctx.stroke();
    }
}

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小提琴 - http://jsfiddle.net/1jgmbyb7/

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