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import { AfterViewInit, Component, ElementRef, Input, OnInit, ViewChild } from '@angular/core';
import Dataset from 'src/app/_data/Dataset';
import Model from 'src/app/_data/Model';
@Component({
selector: 'app-graph',
templateUrl: './graph.component.html',
styleUrls: ['./graph.component.css']
})
export class GraphComponent implements AfterViewInit {
@ViewChild('graphWrapper')
wrapper!: ElementRef;
@ViewChild('graphCanvas')
canvas!: ElementRef;
@Input() model?: Model;
@Input() inputCols: number = 1;
@Input() lineThickness: number = 2;
@Input() nodeRadius: number = 15;
@Input() lineColor: string = '#00a8e8';
@Input() nodeColor: string = '#222277';
@Input() borderColor: string = '#00a8e8';
@Input() inputNodeColor: string = '#ffdd11';
@Input() outputNodeColor: string = '#44ee22';
private ctx?: CanvasRenderingContext2D;
constructor() { }
ngAfterViewInit(): void {
const ctx = this.canvas.nativeElement.getContext('2d');
if (ctx) {
this.ctx = ctx;
} else {
console.warn('Could not get canvas context!');
}
window.addEventListener('resize', () => { this.resize() });
this.update();
this.resize();
}
layers?: Node[][];
update() {
this.layers = [];
let inputNodeIndex = 0;
const inputLayer: Node[] = [];
while (inputNodeIndex < this.inputCols) {
const x = 0.5 / (this.model!.hiddenLayers + 2);
const y = (inputNodeIndex + 0.5) / this.inputCols;
const node = new Node(x, y, this.inputNodeColor);
inputLayer.push(node);
inputNodeIndex += 1;
}
this.layers.push(inputLayer);
let layerIndex = 1;
while (layerIndex < this.model!.hiddenLayers + 1) {
const newLayer: Node[] = [];
let nodeIndex = 0;
while (nodeIndex < this.model!.hiddenLayerNeurons) {
const x = (layerIndex + 0.5) / (this.model!.hiddenLayers + 2);
const y = (nodeIndex + 0.5) / this.model!.hiddenLayerNeurons;
const node = new Node(x, y, this.nodeColor);
newLayer.push(node);
nodeIndex += 1;
}
this.layers.push(newLayer);
layerIndex += 1;
}
const outX = 1 - (0.5 / (this.model!.hiddenLayers + 2));
const outY = 0.5;
this.layers.push([new Node(outX, outY, this.outputNodeColor)])
this.draw();
}
draw() {
this.ctx!.clearRect(0, 0, this.canvas.nativeElement.width, this.canvas.nativeElement.height);
let index = 0;
while (index < this.layers!.length - 1) {
for (let node1 of this.layers![index]) {
for (let node2 of this.layers![index + 1]) {
this.drawLine(node1, node2);
}
}
index += 1;
}
for (let layer of this.layers!) {
for (let node of layer) {
this.drawNode(node);
}
}
}
drawLine(node1: Node, node2: Node) {
this.ctx!.strokeStyle = this.lineColor;
this.ctx!.lineWidth = this.lineThickness;
this.ctx!.beginPath();
this.ctx!.moveTo(node1.x * this.width, node1.y * this.height);
this.ctx!.lineTo(node2.x * this.width, node2.y * this.height);
this.ctx!.stroke();
}
drawNode(node: Node) {
this.ctx!.fillStyle = node.color;
this.ctx!.strokeStyle = this.borderColor;
this.ctx!.lineWidth = this.lineThickness;
this.ctx!.beginPath();
this.ctx!.arc(node.x * this.width, node.y * this.height, this.nodeRadius, 0, 2 * Math.PI);
this.ctx!.fill();
this.ctx!.stroke();
}
width = 200;
height = 200;
ratio = 1;
resize() {
this.width = this.wrapper.nativeElement.offsetWidth;
this.height = this.wrapper.nativeElement.offsetHeight;
this.ratio = this.width / this.height;
if (this.canvas) {
this.canvas.nativeElement.width = this.width;
this.canvas.nativeElement.height = this.height;
}
this.draw();
}
}
class Node {
constructor(
public x: number,
public y: number,
public color: string
) { }
}
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