javascript - 在坐标系 Easeljs 上定位标签

Question

嘿，我正在尝试使用库在 Canvas 中构建以下图片:EaselJS .

我的图片组件是:

1. 两个圆圈 - 黄色和红色以及浅绿色背景
2. 一个从 0 到 1 的坐标系，带有图片中出现的所有必要标签。

我已经成功地实现了我的两个目标。我已经建立了一个基于 stackoverflow 讨论的坐标系: How to draw a full coordinate system with Easeljs? .

我留下了 2 个我很关心的主要问题:

1. 我需要绘制一个适合坐标系的矩形(或正方形)，当前矩形只是一个背景。
2. 我还需要添加 3 个标签:x 轴上的“关键指数”，y 轴上的“长期严重性指数”和长期标题。

如果有人能帮我解决这个问题，我会很高兴我正在添加源代码:

$(function(){
var stage = new createjs.Stage('canvas2d');
var circle1 = new createjs.Shape();
var circle2 = new createjs.Shape();
var rect = new createjs.Rectangle(0, 0, 100, 100);
circle2.graphics.beginFill("yellow").drawCircle(0, 0, 300);
circle2.x = 500;
circle2.y = 0;
stage.addChild(circle2);
circle1.graphics.beginFill("red").drawCircle(0, 0, 150);
circle1.x = 500;
circle1.y = 0;
stage.addChild(circle1);
//stage.addChild(rect);
stage.update();
var coord_xaxis = new createjs.Shape();
stage.addChild(coord_xaxis);
var coord_yaxis = new createjs.Shape();
stage.addChild(coord_yaxis);
var coord_arrow_x = new createjs.Shape();
//stage.addChild(coord_arrow_x);
var coord_arrow_y = new createjs.Shape();
//stage.addChild(coord_arrow_y);
var coord_xaxis_lines = new createjs.Shape();
stage.addChild(coord_xaxis_lines);
var coord_yaxis_lines = new createjs.Shape();
stage.addChild(coord_yaxis_lines);
/**$('#canvas2d').width()/15**/
var axis_center_x = $('#canvas2d').width()/15;
var axis_center_y = $('#canvas2d').height()/1.10;
var xaxis_width = $('#canvas2d').width()-0.05*$('#canvas2d').width();
var yaxis_width = $('#canvas2d').height()-0.05*$('#canvas2d').height();
var axis_start_x = ($('#canvas2d').width()-xaxis_width)/2;
var axis_start_y = ($('#canvas2d').height()-yaxis_width)/6;

var axis_strokewidth = 2;
coord_xaxis.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_xaxis.graphics.moveTo(axis_start_x, axis_center_y).lineTo(axis_start_x+xaxis_width, axis_center_y);
coord_yaxis.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_yaxis.graphics.moveTo(axis_center_x, axis_start_y).lineTo(axis_center_x, axis_start_y+yaxis_width);

// draw coordsys arrow for x-axis
var arrwidth = 5;
var arrxtnd = 5;
coord_arrow_x.graphics.beginFill('#000');
coord_arrow_x.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_arrow_x.graphics.moveTo(axis_center_x, axis_start_y-arrwidth/2).lineTo(axis_center_x+arrwidth, axis_start_y+arrwidth+arrxtnd).lineTo(axis_center_x-arrwidth, axis_start_y+arrwidth+arrxtnd).lineTo(axis_center_x, axis_start_y-arrwidth/2);
coord_arrow_x.graphics.endFill();

// draw coordsys arrow for y-axis
coord_arrow_y.graphics.beginFill('#000');
coord_arrow_y.graphics.beginStroke('#000');
coord_arrow_y.graphics.moveTo(axis_start_x+xaxis_width+arrwidth/2, axis_center_y).lineTo(axis_start_x+xaxis_width-arrwidth-arrxtnd, axis_center_y+arrwidth).lineTo(axis_start_x+xaxis_width-arrwidth-arrxtnd, axis_center_y-arrwidth).lineTo(axis_start_x+xaxis_width+arrwidth/2, axis_center_y);
coord_arrow_y.graphics.endFill();

var stepdist = xaxis_width/5.25;
var steplinew = 6;
// 10 horizontal lines
var xlines = 10;
var labels_x = [];
for(var i=xlines;i>=0;i--) {
 // little black marker
  coord_yaxis_lines.graphics.setStrokeStyle(1,'round').beginStroke('#000');
        coord_yaxis_lines.graphics.moveTo(axis_center_x-steplinew, axis_center_y+(-i/2)*stepdist).lineTo(axis_center_x+steplinew, axis_center_y+(-i/2)*stepdist);
        // labels
        labels_x[i] = new createjs.Text('x', '14px Arial', '#333');
        labels_x[i].x = axis_center_x-12;
        labels_x[i].y = axis_center_y+(-i/2)*stepdist-6; // move up a bit
        stage.addChild(labels_x[i]);
        labels_x[i].text = (i/10);
        labels_x[i].textAlign = 'right';
}
// 12 orthogonal lines
 var stepdist2 = xaxis_width/6.5; 
  var steplinew2 = 6;
var ylines = 10;
var labels_y = [];
for(var i=ylines;i>=1;i--) {
    // dont overdraw y-axis-line
        
        // little black marker
        coord_xaxis_lines.graphics.setStrokeStyle(1,'round').beginStroke('#000');
        coord_xaxis_lines.graphics.moveTo(axis_center_x+(i/1.6)*stepdist2, axis_center_y-steplinew2).lineTo(axis_center_x+(i/1.6)*stepdist2, axis_center_y+steplinew2);           
        // labels
        labels_y[i] = new createjs.Text('x', '14px Arial', '#333');
        labels_y[i].x = axis_center_x+(i/1.6)*stepdist2; // move up a bit
        labels_y[i].y = axis_center_y+12;
        stage.addChild(labels_y[i]);
        labels_y[i].text = (i/10);
        labels_y[i].textAlign = 'center';
}

stage.update(); 
  })

#canvas2d{
  background-color: #32CD32;
}

<script src="https://code.createjs.com/createjs-2015.11.26.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="canvas2d" width="500" height="500"></canvas>

Answer 1

在 EaselJS 中创建矩形的语法与创建圆形相同。区别在于在 graphics 链中调用 drawRect 而不是 drawCircle。

我添加了一个具有任意位置和大小值的矩形以匹配您的整体代码风格，但因为我无法快速找到任何条件。我还删除了 CSS 上的背景颜色。

至于在每个轴上添加标签，我强烈建议您改用 DOM。 EaselJS 对文本的支持几乎无法使用。甚至 EaselJS 本身也建议您使用 DOMElement 而不是 Text DisplayObj。更多关于 DOMElement here .

就我个人而言，我认为使用纯 DOM 而不是 Canvas 工作会更容易获得您想要的结果，除非您正在做一些繁重的基于用户交互的动画工作。

$(function(){
var stage = new createjs.Stage('canvas2d');
var circle1 = new createjs.Shape();
var circle2 = new createjs.Shape();
var rect = new createjs.Shape();
rect.graphics.f("green").drawRect(33, 0, 500, 455);
stage.addChild(rect);
circle2.graphics.beginFill("yellow").drawCircle(0, 0, 300);
circle2.x = 500;
circle2.y = 0;
stage.addChild(circle2);
circle1.graphics.beginFill("red").drawCircle(0, 0, 150);
circle1.x = 500;
circle1.y = 0;
stage.addChild(circle1);
stage.update();
var coord_xaxis = new createjs.Shape();
stage.addChild(coord_xaxis);
var coord_yaxis = new createjs.Shape();
stage.addChild(coord_yaxis);
var coord_arrow_x = new createjs.Shape();
//stage.addChild(coord_arrow_x);
var coord_arrow_y = new createjs.Shape();
//stage.addChild(coord_arrow_y);
var coord_xaxis_lines = new createjs.Shape();
stage.addChild(coord_xaxis_lines);
var coord_yaxis_lines = new createjs.Shape();
stage.addChild(coord_yaxis_lines);
/**$('#canvas2d').width()/15**/
var axis_center_x = $('#canvas2d').width()/15;
var axis_center_y = $('#canvas2d').height()/1.10;
var xaxis_width = $('#canvas2d').width()-0.05*$('#canvas2d').width();
var yaxis_width = $('#canvas2d').height()-0.05*$('#canvas2d').height();
var axis_start_x = ($('#canvas2d').width()-xaxis_width)/2;
var axis_start_y = ($('#canvas2d').height()-yaxis_width)/6;

var axis_strokewidth = 2;
coord_xaxis.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_xaxis.graphics.moveTo(axis_start_x, axis_center_y).lineTo(axis_start_x+xaxis_width, axis_center_y);
coord_yaxis.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_yaxis.graphics.moveTo(axis_center_x, axis_start_y).lineTo(axis_center_x, axis_start_y+yaxis_width);

// draw coordsys arrow for x-axis
var arrwidth = 5;
var arrxtnd = 5;
coord_arrow_x.graphics.beginFill('#000');
coord_arrow_x.graphics.setStrokeStyle(axis_strokewidth,'round').beginStroke('#000');
coord_arrow_x.graphics.moveTo(axis_center_x, axis_start_y-arrwidth/2).lineTo(axis_center_x+arrwidth, axis_start_y+arrwidth+arrxtnd).lineTo(axis_center_x-arrwidth, axis_start_y+arrwidth+arrxtnd).lineTo(axis_center_x, axis_start_y-arrwidth/2);
coord_arrow_x.graphics.endFill();

// draw coordsys arrow for y-axis
coord_arrow_y.graphics.beginFill('#000');
coord_arrow_y.graphics.beginStroke('#000');
coord_arrow_y.graphics.moveTo(axis_start_x+xaxis_width+arrwidth/2, axis_center_y).lineTo(axis_start_x+xaxis_width-arrwidth-arrxtnd, axis_center_y+arrwidth).lineTo(axis_start_x+xaxis_width-arrwidth-arrxtnd, axis_center_y-arrwidth).lineTo(axis_start_x+xaxis_width+arrwidth/2, axis_center_y);
coord_arrow_y.graphics.endFill();

var stepdist = xaxis_width/5.25;
var steplinew = 6;
// 10 horizontal lines
var xlines = 10;
var labels_x = [];
for(var i=xlines;i>=0;i--) {
 // little black marker
  coord_yaxis_lines.graphics.setStrokeStyle(1,'round').beginStroke('#000');
        coord_yaxis_lines.graphics.moveTo(axis_center_x-steplinew, axis_center_y+(-i/2)*stepdist).lineTo(axis_center_x+steplinew, axis_center_y+(-i/2)*stepdist);
        // labels
        labels_x[i] = new createjs.Text('x', '14px Arial', '#333');
        labels_x[i].x = axis_center_x-12;
        labels_x[i].y = axis_center_y+(-i/2)*stepdist-6; // move up a bit
        stage.addChild(labels_x[i]);
        labels_x[i].text = (i/10);
        labels_x[i].textAlign = 'right';
}
// 12 orthogonal lines
 var stepdist2 = xaxis_width/6.5; 
  var steplinew2 = 6;
var ylines = 10;
var labels_y = [];
for(var i=ylines;i>=1;i--) {
    // dont overdraw y-axis-line
        
        // little black marker
        coord_xaxis_lines.graphics.setStrokeStyle(1,'round').beginStroke('#000');
        coord_xaxis_lines.graphics.moveTo(axis_center_x+(i/1.6)*stepdist2, axis_center_y-steplinew2).lineTo(axis_center_x+(i/1.6)*stepdist2, axis_center_y+steplinew2);           
        // labels
        labels_y[i] = new createjs.Text('x', '14px Arial', '#333');
        labels_y[i].x = axis_center_x+(i/1.6)*stepdist2; // move up a bit
        labels_y[i].y = axis_center_y+12;
        stage.addChild(labels_y[i]);
        labels_y[i].text = (i/10);
        labels_y[i].textAlign = 'center';
}

stage.update(); 
  })

<script src="https://code.createjs.com/createjs-2015.11.26.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="canvas2d" width="500" height="500"></canvas>