Epanet文件解析和管线还原二

/**
    * 根据源码查看，计算坐标点的逻辑如下,w为页面宽，h为页面高，NODE_DIAM = 2
    * (1) 将所有的点求取外包矩形;
    * (2) 根据页面的宽w,高:h,根据公式：factor =(bounds.width / bounds.height) < (((double) w) / h) ? h / bounds.height : w / bounds.width，求factor;
    * (3) 求所有点中的最小x坐标dx,最小y坐标dy;
    * (4) dwidth= Math.abs(最大的x坐标-最小的x坐标),dheight=Math.abs(最大的y坐标-最小的x坐标);
    * (5) factor *= .9d;
    * (6) dx += dwidth * .5d - w * 0.5 / factor;dy += dheight * .5d - h * 0.5 / factor;
    * (7) 构建坐标点x=(int)(position.getX() - dx) * factor,y=(int)(-position.getY() - dy) * factor
    * (8) 绘制图像：x=(int)(point.getX() - NODE_DIAM / 2), y=(int)(point.getY() - NODE_DIAM / 2)
    */
let minX=Number.MAX_VALUE;
let minY=Number.MAX_VALUE;
let maxX=Number.MIN_VALUE;
let maxY=Number.MIN_VALUE;

// 遍历数组，获取节点坐标
let nodes=content.nodes;
for(let item of nodes){
    let position=item.position;
    let x=position.x;
    let y=position.y;
    if(x<minX)
        minX=x;
    if(y<minY)
        minY=y;
    if(x>maxX)
        maxX=x;
    if(y>maxY)
        maxY=y;
}

let w=this.$el.offsetWidth;
let h=this.$el.offsetHeight;
let bounds={
    minX:minX,
    minY:minY,
    maxX:maxX,
    maxY:maxY,
    height:Math.floor((maxY-minY) * 100) / 100,
    width:Math.floor((maxX-minX) * 100) / 100
}
// 求比例因子
let factor =(bounds.width / bounds.height) < (w / h) ? h / bounds.height : w / bounds.width;

let dx = bounds.minX;
let dy = bounds.minY;
let dwidth = Math.abs(bounds.maxX - bounds.maxX);
let dheight = Math.abs(bounds.maxY - bounds.minY);

factor *= .9;

dx += dwidth * .5 - w * 0.5 / factor;
dy += dheight * .5 - h * 0.5 / factor;

// 绘制节点
for(let item of nodes){
    let position=item.position;
    let x=position.x;
    let y=position.y;
    x=(x - dx) * factor;
    y=(y-dy)*factor;
    // 创建点
    let f=new Feature({
        geometry:new Point([x,y])
    });
    // 加入到地图上去
    source.addFeature(f);
}

// 绘制连线
let links=content.links;
for(let link of links){
    // 构建第一个点
    let first=link.first;
    let position=first.position;
    let x=position.x;
    let y=position.y;
    x=(x - dx) * factor;
    y=(y-dy)*factor;
    let firstPoint=[x,y];
    
    // 构建第二个点
    let second=link.second;
    position=second.position;
    x=position.x;
    y=position.y;
    x=(x - dx) * factor;
    y=(y-dy)*factor;
    let secondPoint=[x,y];
    // 创建直线
    let f=new Feature({
        geometry:new LineString([firstPoint,secondPoint])
    });
    // 加入到地图上去
    source.addFeature(f);
}