三角图

---

效果

使用方法

<template>
    <div>
       <lt-canvas ref="canvas" :width="750" :height="500"></lt-canvas>       
    </div>
</template>
<script>
    import LightChart from 'light-chart';
    export default {
        components:{
            ltCanvas:require("light-chart/canvas")
        },
        data(){
            return {}
        },
        mounted(){
            const Shape = LightChart.Shape;
            Shape.registerShape('interval', 'triangle', {
                getPoints(cfg) {
                const x = cfg.x;
                const y = cfg.y;
                const y0 = cfg.y0;
                const width = cfg.size;
                return [
                    { x: x - width / 2, y: y0 },
                    { x: x, y: y },
                    { x: x + width / 2, y: y0 }
                ]
                },
                draw(cfg, group) {
                const points = this.parsePoints(cfg.points); // 将0-1空间的坐标转换为画布坐标
                const polygon = group.addShape('polygon', {
                    attrs: {
                    points: [
                        { x:points[0].x, y:points[0].y },
                        { x:points[1].x, y:points[1].y },
                        { x:points[2].x, y:points[2].y }
                    ],
                    fill: cfg.color
                    }
                });
                return polygon; // 将自定义Shape返回
                }
            });

            const data = [
                { genre: 'Sports', sold: 275 },
                { genre: 'Strategy', sold: 115 },
                { genre: 'Action', sold: 120 },
                { genre: 'Shooter', sold: 350 },
                { genre: 'Other', sold: 150 }
            ];

            let chart = new LightChart.Chart({
                ltCanvas:this.$refs.canvas
            });

            chart.source(data);
            chart.interval().position('genre*sold').color('genre').shape('triangle');
            chart.render();
        }
            
    }
</script>