html5 canvas画流程图

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title></title>

    </head>

    <body>

        <canvas id="myCanvas" width="1200" height="800" style="border: solid 1px;"></canvas>

        <script type="text/javascript" src="js/arrow.js"></script>

        <script type="text/javascript" src="js/step.js" ></script>

        <script type="text/javascript" src="js/flow.js"></script>

    </body>

</html>

//

//  arrow.js

//  <箭头对象>

//

//  Created by DurantSimpson on 2016-12-08.

//  Copyright 2016 DurantSimpson. All rights reserved.

// 

/**

 *

 * @param {Object} x1起始点横坐标

 * @param {Object} y1起始点纵坐标

 * @param {Object} x2结束点横坐标

 * @param {Object} y2结束点纵坐标

 */

function Arrow(x1, y1, x2, y2) {

    this.x1 = x1;

    this.y1 = y1;

    this.x2 = x2;

    this.y2 = y2;

    this.tmpX1 = null;

    this.tmpY1 = null;

    this.tmpX2 = null;

    this.tmpY2 = null;

    this.color = "black";

}

Arrow.prototype.setColor = function(color) {

    this.color=color;

}

/**

 *

 * @param {Object} x1起始点横坐标

 * @param {Object} y1起始点纵坐标

 * @param {Object} x2结束点横坐标

 * @param {Object} y2结束点纵坐标

 */

Arrow.prototype.setP = function(x1, y1, x2, y2) {

    this.x1 = x1;

    this.y1 = y1;

    this.x2 = x2;

    this.y2 = y2;

}

/**

 * 第一个拐点

 */

Arrow.prototype.setP1 = function(tmpX1,tmpY1) {

    this.tmpX1=tmpX1;

    this.tmpY1=tmpY1;

}

/**

 * 第二个拐点

 */

Arrow.prototype.setP2 = function(tmpX2,tmpY2) {

    this.tmpX2=tmpX2;

    this.tmpY2=tmpY2;

}

Arrow.prototype.drawBottomToTop = function(ctx) {

    if (this.x1 != this.x2) {

        this.setP1(this.x1,(this.y1+this.y2)/2);

        this.setP2(this.x2,(this.y1+this.y2)/2);

        this.draw(ctx);

    }else{

        this.draw(ctx);

    }

}

Arrow.prototype.drawLeftOrRightToTop = function(ctx) {

        this.setP1(this.x2,this.y1);

        this.draw(ctx);

}

Arrow.prototype.drawLeftToRightOrRightToLeft = function(ctx) {

    if (this.y1 != this.y2) {

        this.setP1((this.x1+this.x2)/2,this.y1);

        this.setP2((this.x1+this.x2)/2,this.y2);

        this.draw(ctx);

    }else{

        this.draw(ctx);

    }

}

Arrow.prototype.draw = function(ctx) {

    // arbitrary styling

    ctx.strokeStyle = this.color;

    ctx.fillStyle = this.color;

    // draw the line

    ctx.beginPath();

    ctx.moveTo(this.x1, this.y1);

    if(this.tmpX1 != null && this.tmpY1 != null && this.tmpX2 != null && this.tmpY2 != null) {

        ctx.lineTo(this.tmpX1, this.tmpY1);

        ctx.closePath();

        ctx.stroke();

        ctx.beginPath();

        ctx.moveTo(this.tmpX1, this.tmpY1)

        ctx.lineTo(this.tmpX2, this.tmpY2);

        ctx.closePath();

        ctx.stroke();

        ctx.beginPath();

        ctx.moveTo(this.tmpX2, this.tmpY2);

        ctx.lineTo(this.x2, this.y2);

        ctx.closePath();

        ctx.stroke();

        var endRadians = Math.atan((this.y2 - this.tmpY2) / (this.x2 - this.tmpX2));

        endRadians += ((this.x2 >= this.tmpX2) ? 90 : -90) * Math.PI / 180;

        this.drawArrowhead(ctx, this.x2, this.y2, endRadians);

    } else if(this.tmpX1 != null && this.tmpY1 != null && this.tmpX2 == null && this.tmpY2 == null) {

        ctx.lineTo(this.tmpX1, this.tmpY1);

        ctx.closePath();

        ctx.stroke();

        ctx.beginPath();

        ctx.moveTo(this.tmpX1, this.tmpY1)

        ctx.lineTo(this.x2, this.y2);

        ctx.closePath();

        ctx.stroke();

        var endRadians = Math.atan((this.y2 - this.tmpY1) / (this.x2 - this.tmpX1));

        endRadians += ((this.x2 >= this.tmpX1) ? 90 : -90) * Math.PI / 180;

        this.drawArrowhead(ctx, this.x2, this.y2, endRadians);

    }else if(this.tmpX1 == null && this.tmpY1 == null && this.tmpX2 == null && this.tmpY2 == null){

        ctx.lineTo(this.x2, this.y2);

        ctx.closePath();

        ctx.stroke();

        var endRadians = Math.atan((this.y2 - this.y1) / (this.x2 - this.x1));

        endRadians += ((this.x2 >= this.x1) ? 90 : -90) * Math.PI / 180;

        this.drawArrowhead(ctx, this.x2, this.y2, endRadians);

    }

}

/**

 * 画箭头

 */

Arrow.prototype.drawArrowhead = function(ctx, x, y, radians) {

    ctx.save();

    ctx.beginPath();

    ctx.translate(x, y);

    ctx.rotate(radians);

    ctx.moveTo(0, 0);

    ctx.lineTo(5, 10);

    ctx.lineTo(-5, 10);

    ctx.closePath();

    ctx.restore();

    ctx.fill();

}

//

//  step.js

//  <流程图对象>

//

//  Created by DurantSimpson on 2016-12-08.

//  Copyright 2016 DurantSimpson. All rights reserved.

//

function drawRoundRect(x, y, w, h) {

    var r = h / 2;

    cxt.beginPath();

    cxt.moveTo(x + r, y);

    cxt.arcTo(x + w, y, x + w, y + h, r);

    cxt.arcTo(x + w, y + h, x, y + h, r);

    cxt.arcTo(x, y + h, x, y, r);

    cxt.arcTo(x, y, x + w, y, r);

    cxt.closePath();

    cxt.stroke();

}

function drawRhombus(x, y, l) {

    cxt.beginPath();

    cxt.moveTo(x, y + l);

    cxt.lineTo(x - l * 2, y);

    cxt.lineTo(x, y - l);

    cxt.lineTo(x + l * 2, y);

    cxt.closePath();

    cxt.stroke();

}

/**

 * 圆角矩形开始对象

 * @param {Object} x

 * @param {Object} y

 */

function Start(x, y) {

    this.h = 50;

    this.w = 2 * this.h;

    this.x = x;

    this.y = y;

    drawRoundRect(x - this.w / 2, y - this.h / 2, this.w, this.h);

}

/**

 * 矩形步骤对象

 * @param {Object} x

 * @param {Object} y

 */

function Step(x, y) {

    this.flag = "step";

    this.h = 50;

    this.w = 2 * this.h;

    this.x = x;

    this.y = y;

    cxt.strokeRect(x - this.w / 2, y - this.h / 2, this.w, this.h);

}

/**

 * 菱形条件对象

 * @param {Object} x

 * @param {Object} y

 */

function Condition(x, y) {

    this.flag = "condition";

    this.l = 30;

    this.x = x;

    this.y = y;

    drawRhombus(x, y, this.l);

}

Start.prototype.drawBottomToTop = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.h / 2);

        arrow.drawBottomToTop(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.l);

        arrow.drawBottomToTop(cxt);

    }

}

Step.prototype.drawBottomToTop = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.h / 2);

        arrow.drawBottomToTop(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.l);

        arrow.drawBottomToTop(cxt);

    }

}

Condition.prototype.drawBottomToTop = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x, this.y + this.l, obj.x, obj.y - obj.h / 2);

        arrow.drawBottomToTop(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x, this.y + this.l, obj.x, obj.y - obj.l);

        arrow.drawBottomToTop(cxt);

    }

}

Condition.prototype.drawRightToTop = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x, obj.y - obj.h / 2);

        arrow.drawLeftOrRightToTop(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x, obj.y - obj.l);

        arrow.drawLeftOrRightToTop(cxt);

    }

}

Condition.prototype.drawLeftToTop = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x, obj.y - obj.h / 2);

        arrow.drawLeftOrRightToTop(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x, obj.y - obj.l);

        arrow.drawLeftOrRightToTop(cxt);

    }

}

Condition.prototype.drawRightToLeft = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x - this.w / 2, obj.y);

        arrow.drawLeftToRightOrRightToLeft(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x - this.l * 2, obj.y);

        arrow.drawLeftToRightOrRightToLeft(cxt);

    }

}

Condition.prototype.drawLeftToRight = function(obj) {

    if(obj.flag == "step") {

        var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x + this.w / 2, obj.y);

        arrow.drawLeftToRightOrRightToLeft(cxt);

    } else if(obj.flag == "condition") {

        var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x + this.l * 2, obj.y);

        arrow.drawLeftToRightOrRightToLeft(cxt);

    }

}

//

//  flow.js

//  <主要逻辑>

//

//  Created by DurantSimpson on 2016-12-08.

//  Copyright 2016 DurantSimpson. All rights reserved.

//

var canvas = document.getElementById("myCanvas");

var cxt = canvas.getContext('2d');

var start = new Start(600,25);//新建开始对象

var step1 = new Step(600,105);//新建第一个步骤

start.drawBottomToTop(step1); //画箭头(从开始对象指向第一个步骤)

var condition1 = new Condition(300, 200);//新建第一个条件对象

var condition2 = new Condition(450, 200);

var condition3 = new Condition(600, 200);

var condition4 = new Condition(750, 200);

var condition5 = new Condition(900, 200);

step1.drawBottomToTop(condition1);//画箭头(从第一个步骤指向第一个条件)

step1.drawBottomToTop(condition2);

step1.drawBottomToTop(condition3);

step1.drawBottomToTop(condition4);

step1.drawBottomToTop(condition5);

var step2 = new Step(450,295);

var step3 = new Step(750,295);

condition1.drawBottomToTop(step2);

condition2.drawBottomToTop(step2);

condition3.drawBottomToTop(step2);

condition4.drawBottomToTop(step3);

condition5.drawBottomToTop(step3);

var condition6 = new Condition(300, 400);

var condition7 = new Condition(450, 400);

var condition8 = new Condition(750, 400);

var condition9 = new Condition(900, 400);

var condition10 = new Condition(450, 500);

var condition11 = new Condition(900, 500);

var condition12 = new Condition(450, 600);

var condition13 = new Condition(900, 600);

step2.drawBottomToTop(condition6);

step3.drawBottomToTop(condition9);

var step4 = new Step(300,725);

var step5 = new Step(450,725);

var step6 = new Step(600,725);

var step7 = new Step(750,725);

var step8 = new Step(900,725);

condition6.drawBottomToTop(step4);

condition6.drawRightToLeft(condition7);

condition7.drawRightToTop(step6);

condition7.drawBottomToTop(condition10);

condition8.drawBottomToTop(step7);

condition9.drawLeftToRight(condition8);

condition9.drawBottomToTop(condition11);

condition10.drawBottomToTop(condition12);

condition11.drawBottomToTop(condition13);

condition12.drawBottomToTop(step5);

condition13.drawBottomToTop(step8);

/*canvas.onclick = function(e) { //给canvas添加点击事件

    e = e || event; //获取事件对象

    //获取事件在canvas中发生的位置

    var x = e.clientX - canvas.offsetLeft;

    var y = e.clientY - canvas.offsetTop;

    //如果事件位置在矩形区域中

    alert('x:' + x + "y:" + y);

     if(x>=rect.x&&x<=rect.x+rect.w&&y>=rect.y&&y<=rect.y+rect.h){

         alert('clicked')

     }

}*/

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