如何在Angular2中使用SVG自定义图表？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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demo：
html:
ts:
options = {
type: 'line', //图表类型
xAxis: { //X轴的数据
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: { //X轴的数据
data: [120, 220, 150, 111, -150, 55, 60],
},
width: 600, //宽
height: 500, //高
dataPadding: 8 //条形图之间的距离
};效果：
源代码：
import {
Input,
OnInit,
ViewChild,
Component,
ViewEncapsulation,
ElementRef,
AfterViewInit,
ChangeDetectorRef,
} from '@angular/core';
import { NgoChartSvgParams, Scale, Axis, Chart } from './chart-svg-params';
@Component({
selector: 'ngo-chart-svg',
templateUrl: './chart-svg.html',
styleUrls: ['./chart-svg.scss'],
encapsulation: ViewEncapsulation.Native
})
export class NgoChartSvg implements OnInit, AfterViewInit {
@Input() inputParams: NgoChartSvgParams;
@ViewChild('svg') svg: ElementRef;
@ViewChild('polyline') polyline: ElementRef;
params: NgoChartSvgParams;
AxisY: Axis; // Y轴
AxisX: Axis; // X轴
valueToPxRatio: number; // 值转px的比率
Y0: number; // 坐标轴 (0,0)的Y轴
Yscale: Array = []; // Y轴刻度值
Xscale: Array = []; // X轴刻度值
XgapWidth: number; // X轴刻度之间的间隙宽度
data: Array = [];
color: string;
type: string;
polyLinePoints: string;
polyLineLength: number;
constructor(
private ele: ElementRef,
private cd: ChangeDetectorRef
) { }
...
ngOnInit() {
this.initParams();
const svg = this.svg.nativeElement;
const _width = this.params.width;
const _height = this.params.height;
svg.setAttribute('width', _width);
svg.setAttribute('height', _height);
// 绘制 y轴
this.drawAxisY();
this.drawScaleY();
// 绘制 x轴
this.drawAxisX();
this.drawScaleX();
this.drawRect();
if (this.params.type === 'line') {
this.drawLine();
}
}
ngAfterViewInit() {
if (this.polyline) {
this.polyLineLength = this.polyline.nativeElement.getTotalLength();
this.cd.detectChanges();
}
}
}html
{{scale.label}}
{{scale.label}}
bar
{{item.value}}
0">
{{item.value}}
line
{{item.value}}
css
svg {
background: rgba(0, 0, 0, 0.2);
border: 1px solid black;
}
svg * {
position: static;
font-size: 16px;
}
._polyline {
fill: none;
animation: lineMove 1.5s ease-in-out forwards;
}
@keyframes lineMove {
to {
stroke-dashoffset: 0;
}
}一、初始化参数
//首先获取传入的参数
@Input() inputParams;
//初始化
const _params: NgoChartSvgParams = {
xAxis: this.inputParams.xAxis,
yAxis: this.inputParams.yAxis,
type: this.inputParams.type ? this.inputParams.type : 'bar',
width: this.inputParams.width ? this.inputParams.width : 700,
height: this.inputParams.height ? this.inputParams.height : 500,
dataPadding: this.inputParams.dataPadding !== undefined ? this.inputParams.dataPadding : 8,
YscaleNo: this.inputParams.YscaleNo >= 3 ? this.inputParams.YscaleNo : 6,
};
this.color = 'black';
this.type = _params.type;
this.params = _params;二：绘制坐标轴Y轴
const _height = this.params.height;
const _pad = this.params.padding;
const _arrow = _pad + ',' + (_pad - 5) + ' ' + (_pad - 6) + ',' + (_pad + 12) + ' ' + (_pad + 6) + ',' + (_pad + 12);
this.AxisY = {
x1: _pad,
y1: _height - _pad,
x2: _pad,
y2: _pad,
arrow: _arrow
};三、绘制Y轴的刻度
const _height = this.params.height;
const _width = this.params.width;
// 显示label的边距
const _padding = this.params.padding;
const _Ydata = this.params.yAxis.data;
// 显示的刻度数
const _YscaleNo = this.params.YscaleNo;
const _dataMax = this.getMinAndMaxData(_Ydata).dataMax;
const _dataMin = this.getMinAndMaxData(_Ydata).dataMin;
let _YminValue;
let _YgapValue;
if (_dataMin < 0) {
_YgapValue = Math.ceil((_dataMax - _dataMin) / (_YscaleNo) / 10) * 10;
_YminValue = Math.floor(_dataMin / _YgapValue) * _YgapValue;
} else {
_YgapValue = Math.ceil((_dataMax) / (_YscaleNo) / 10) * 10;
_YminValue = 0;
}
// Y轴坐标点
const _y2 = this.AxisY.y2;
const _y1 = this.AxisY.y1;
const _x1 = this.AxisY.x1;
// Y轴刻度的间隙宽度
const _YgapWidth = (_y1 - _y2) / (this.params.YscaleNo);
this.valueToPxRatio = _YgapValue / _YgapWidth;
// 坐标轴（0,0）的Y轴坐标
const _Y0 = _y1 - Math.abs(_YminValue / this.valueToPxRatio);
this.Y0 = _Y0;
for (let i = 0; i < this.params.YscaleNo; i++) {
const _obj: Scale = { x1: 0, x2: 0, y1: 0, y2: 0, label: '', value: 0 };
_obj.x1 = _x1;
_obj.y1 = _y1 - _YgapWidth * i;
_obj.x2 = _x1 + _width - 2 * _padding;
_obj.y2 = _y1 - _YgapWidth * i;
_obj.label = _YminValue + _YgapValue * i;
this.Yscale.push(_obj);
}四、绘制X坐标轴
const _width = this.params.width;
// 显示label的边距
const _pad = this.params.padding;
const _x2 = _width - _pad;
const _y2 = this.Y0;
const _arrow = (_x2 + 5) + ',' + _y2 + ' ' + (_x2 - 10) + ',' + (_y2 - 6) + ' ' + (_x2 - 10) + ',' + (_y2 + 6);
this.AxisX = {
x1: _pad,
y1: _y2,
x2: _x2,
y2: _y2,
arrow: _arrow
};五、绘制X轴刻度
const _width = this.params.width;
const _Xdata = this.params.xAxis.data;
const _Ydata = this.params.yAxis.data;
const Y0 = this.Y0;
const _x1 = this.AxisX.x1;
const _x2 = this.AxisX.x2;
const XgapWidth = ((_x2 - _x1) / (this.params.xAxis.data.length + 1));
this.XgapWidth = XgapWidth;
for (let i = 0; i < _Xdata.length; i++) {
const _obj: Scale = { x1: 0, x2: 0, y1: 0, y2: 0, value: 0, label: '' };
_obj.y1 = Y0;
_obj.y2 = Y0 + 5;
_obj.label = _Xdata[i];
_obj.value = _Ydata[i];
_obj.x1 = _x1 + XgapWidth * (i + 1);
_obj.x2 = _x1 + XgapWidth * (i + 1);
this.Xscale.push(_obj);六、绘制矩形
const _value = this.params.yAxis.data;
const _dataPadding = this.params.dataPadding;
const _XgapWidth = this.XgapWidth;
for (let i = 0; i < _value.length; i++) {
const element = _value[i];
const _obj: Chart = { x: 0, y: 0, w: 0, h: 0, value: 0 };
_obj.w = _XgapWidth - 2 * _dataPadding;
_obj.x = this.Xscale[i].x1 - _obj.w - _dataPadding;
_obj.h = Math.abs(this.Xscale[i].value / this.valueToPxRatio);
_obj.value = this.Xscale[i].value;
if (this.Xscale[i].value >= 0) {
_obj.y = this.Y0 - (this.Xscale[i].value) / this.valueToPxRatio;
} else {
_obj.y = this.Y0;
}
this.data.push(_obj);
}
}七、绘制折线
const _data = this.data;
let _str = '';
_data.forEach(ele => {
if (ele.value < 0) {
ele.y = ele.y + ele.h;
}
_str += (ele.x + ele.w / 2) + ',' + ele.y + ' ';
});
this.polyLinePoints = _str;关于如何在Angular2中使用SVG自定义图表问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注创新互联成都网站设计公司行业资讯频道了解更多相关知识。
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