Web前端笔记-two.js画三角形及画tip含tip旋转

程序运行截图如下：

旋转下：

代码如下：

import * as Two from "JS/two";
import * as $ from "JS/jquery";


let isPressed = false;
let originalPositionX = 0;
let originalPositionY = 0;
let two;
let mouse;


export function drawGraphic(){

  let elem = document.getElementById("draw-shapes");
  let params = {

    fullscreen: true,
    autostart: true
  }

  two = new Two(params).appendTo(elem);
  mouse = new Two.ZUI(two.scene);
  mouse.addLimits(0.1, 10);

  let $stage = $(two.renderer.domElement);
  $stage.bind('mousewheel wheel', function(event){

    let e = event.originalEvent;
    e.stopPropagation();
    e.preventDefault();

    let dy = (e.wheelDeltaY || -e.deltaY) / 1000;
    mouse.zoomBy(dy, e.clientX, e.clientY);
  });

  $stage.bind('mouseup', function(event){

    isPressed = false;
  });
  $stage.bind('mouseout', function(event){

    isPressed = false;
  })

  $stage.bind('mousemove', function(event){

    if(isPressed){

      let boolX = event.clientX - originalPositionX;
      let boolY = event.clientY - originalPositionY;
      mouse.graphicMove(boolX, boolY);
      originalPositionX = event.clientX;
      originalPositionY = event.clientY;
    }
  });

  $stage.bind('mousedown', function(event){

    isPressed = true;
    originalPositionX = event.clientX;
    originalPositionY = event.clientY;
  });

  //移动端触碰开始
  $stage.bind('touchstart', function (event){

    originalPositionX = event.changedTouches[0].pageX;
    originalPositionY = event.changedTouches[0].pageY;
    isPressed = true;
  });
  $stage.bind('touchend', function(event){

    isPressed = false;
  });
  $stage.bind('touchmove', function(event){

    let currentX = event.changedTouches[0].pageX;
    let currentY = event.changedTouches[0].pageY;


    let boolX = currentX - originalPositionX;
    let boolY = currentY - originalPositionY;

    mouse.graphicMove(boolX, boolY);
    originalPositionX = currentX;
    originalPositionY = currentY;
  });

  //移动端触碰结束
  let text = two.makeText("Hello", 0, 0);

  text.size = 20;
  text.fill = "red";
  text.rotation = 90 * Math.PI / 180;

  //查询
  let corona = makeTriangle(two, 100);
  corona.noStroke();
  corona.fill = "red";
  corona.translation.set(200, 200);

  let tip = makeTip(two, "错误", 'rgb(255, 255, 255)', 90);
  tip.translation.set(500, 500);
}


function makeTriangle(two, size) {

  let tri = two.makePath(-size / 2, 0, size / 2, 0, 0, size);
  return tri;
}

function makeTip(two, text, textColor, rotation){

  let group = two.makeGroup();
  let len = 100;
  let tip = two.makePath(-len / 2, -len / 3, -len / 2, -len, len / 2, -len, len / 2, -len / 3 , 0, 0 );
  tip.fill = 'red'
  tip.rotation = rotation * Math.PI / 180;
  group.add(tip);

  let txt = two.makeText(text, 0, -len / 1.8);
  txt.size = 20;
  txt.fill = textColor;
  group.add(txt);
  group.noStroke();

  //连文字一起旋转
  //group.rotation = rotation * Math.PI / 180;

  return group;
}

此处的三角形关键代码：

点1：(-size / 2, 0)

点2：(size / 2, 0)

点3：(0, size)

这里是一个倒三角形。

下面是tip的关键代码：