Angular2使用SVG自定义图表（条形图、折线图）组件示例

本文实例讲述了Angular2使用SVG自定义图表（条形图、折线图）组件。分享给大家供大家参考

本文实例讲述了Angular2使用SVG自定义图表（条形图、折线图）组件。分享给大家供大家参考，具体如下：

要求：用户将数据作为参数传进来，通过类型决定渲染何种类型的图标。

demo：

html:

<ngo-chart [inputParams]="options"></ngo-chart>

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<Scale> = []; // Y轴刻度值
 Xscale: Array<Scale> = []; // X轴刻度值
 XgapWidth: number; // X轴刻度之间的间隙宽度
 data: Array<Chart> = [];
 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

<svg #svg>
 <!-- Y轴 -->
 <g>
 <line [attr.x1]="AxisY.x1" [attr.y1]="AxisY.y1+15" [attr.x2]="AxisY.x2" [attr.y2]="AxisY.y2" [attr.stroke]="color" [attr.fill]="color"
 style="stroke-width:3" />
 <polygon [attr.points]="AxisY.arrow" />
 <ng-container *ngFor="let scale of Yscale">
 <line class="dash" [attr.x1]="scale.x1" [attr.x2]="scale.x2" [attr.y1]="scale.y1" [attr.y2]="scale.y2" stroke="rgba(0,0,0,0.3)"
 />
 <text class="_label" [attr.x]="scale.x1-5" style="text-anchor: end" [attr.y]="scale.y1" [attr.fill]="color" [attr.fill]="color">{{scale.label}}</text>
 </ng-container>
 </g>
 <!-- X轴 -->
 <g>
 <line [attr.x1]="AxisX.x1-15" [attr.x2]="AxisX.x2" [attr.y1]="AxisX.y1" [attr.y2]="AxisX.y2" [attr.stroke]="color" [attr.fill]="color"
 style="stroke-width:3" />
 <polygon [attr.points]="AxisX.arrow" />
 <ng-container *ngFor="let scale of Xscale">
 <line [attr.x1]="scale.x1" [attr.x2]="scale.x2" [attr.y1]="scale.y1" [attr.y2]="scale.y2" [attr.stroke]="color" [attr.fill]="color"
 style="stroke-width:1" />
 <text class="_label" [attr.x]="scale.x1-XgapWidth/2" [attr.y]="AxisY.y1+15" [attr.fill]="color" style="text-anchor: middle;">{{scale.label}}</text>
 </ng-container>
 </g>
 <!-- 矩形 -->
 <ng-container *ngIf="type==='bar'">
 <text x="10" y="20" fill="red">bar</text>
 <g>
 <ng-container *ngFor="let item of data">
 <ng-container *ngIf="item.value<=0">
 <rect class="_rect" [attr.x]="item.x" [attr.y]="item.y" [attr.width]="item.w" [attr.height]="item.h" fill="color">
 <animate attributeName="height" [attr.from]="item.h*0.6" [attr.to]="item.h" begin="0s" dur="1.1s" />
 </rect>
 <text [attr.x]="item.x+item.w/2" [attr.y]="item.y+item.h-5" fill="white" style="text-anchor: middle;">{{item.value}}</text>
 </ng-container>
 <ng-container *ngIf="item.value>0">
 <rect [attr.x]="item.x" [attr.y]="item.y" [attr.width]="item.w" [attr.height]="item.h" fill="color">
 <animate attributeName="y" [attr.from]="item.y+item.h*0.4" [attr.to]="item.y" begin="0s" dur="1.1s" />
 <animate attributeName="height" [attr.from]="item.h*0.6" [attr.to]="item.h" begin="0s" dur="1.1s" />
 </rect>
 <text class="_label" [attr.x]="item.x+item.w/2" [attr.y]="item.y+18" fill="white" style="text-anchor: middle;">{{item.value}}
 <animate attributeName="opacity" from="0" to="1" begin="0s" dur="1.1s" />
 </text>
 </ng-container>
 </ng-container>
 </g>
 </ng-container>
 <!--折线 -->
 <ng-container *ngIf="type==='line'">
 <text x="10" y="20" fill="red">line</text>
 <g>
 <polyline #polyline class="_polyline" [attr.points]="polyLinePoints" fill="none" [attr.stroke]='color' [attr.stroke-dasharray]="polyLineLength"
 [attr.stroke-dashoffset]="polyLineLength" />
 <ng-container *ngFor="let item of data">
 <circle [attr.cx]="item.x+item.w/2" [attr.cy]="item.y" r="2" [attr.fill]="color" [attr.stroke]='color' />
 <text class="_label" [attr.x]="item.x+item.w/2" [attr.y]="item.y+20" fill="white" style="text-anchor: middle;">{{item.value}}
 <animate attributeName="opacity" from="0" to="1" begin="0s" dur="1.1s" />
 </text>
 </ng-container>
 </g>
 </ng-container>
</svg>

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;