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annotate Resources/Samples/WebApplications/DrawingDicomizer/drawing.js @ 3349:ef18ea68a362

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author Alain Mazy <alain@mazy.be>
date Thu, 18 Apr 2019 15:52:56 +0200
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56a813a4714d drawing dicomizer sample
Sebastien Jodogne <s.jodogne@gmail.com>
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1 /**
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Sebastien Jodogne <s.jodogne@gmail.com>
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2 * Copyright 2010 William Malone (www.williammalone.com)
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 * Unless required by applicable law or agreed to in writing, software
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11 * distributed under the License is distributed on an "AS IS" BASIS,
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 * See the License for the specific language governing permissions and
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14 * limitations under the License.
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15 **/
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16
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17
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18 /**
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19 * This code comes from the blog entry "Create a Drawing App with
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20 * HTML5 Canvas and JavaScript" by William Malone. It is the "simple
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21 * demo" of a pure HTML5 drawing application.
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22 *
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23 * http://www.williammalone.com/articles/create-html5-canvas-javascript-drawing-app/
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24 *
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25 * To keep this sample code as simple as possible, we do not implement
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26 * hacks for the canvas of Microsoft Internet Explorer.
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27 **/
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28
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29
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30 if ($.browser.msie) {
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31 alert('Please use Mozilla Firefox or Google Chrome. Microsoft Internet Explorer is not supported.');
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32 }
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33
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34
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35 var context;
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36 var clickX = new Array();
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37 var clickY = new Array();
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38 var clickDrag = new Array();
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39 var paint;
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40
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41
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42 function addClick(x, y, dragging)
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43 {
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44 clickX.push(x);
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45 clickY.push(y);
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46 clickDrag.push(dragging);
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47 }
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48
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49
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50 function Redraw()
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51 {
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52 context.fillStyle = '#ffffff';
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53 context.fillRect(0, 0, context.canvas.width, context.canvas.height); // Clears the canvas
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54
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55 context.strokeStyle = '#df4b26';
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56 context.lineJoin = 'round';
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57 context.lineWidth = 5;
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58
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59 for (var i=0; i < clickX.length; i++) {
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60 context.beginPath();
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61 if (clickDrag[i] && i) {
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62 context.moveTo(clickX[i - 1], clickY[i - 1]);
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63 } else {
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64 context.moveTo(clickX[i] - 1, clickY[i]);
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65 }
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66 context.lineTo(clickX[i], clickY[i]);
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67 context.closePath();
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68 context.stroke();
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69 }
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70 }
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71
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72
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73 $(document).ready(function() {
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74 context = document.getElementById('canvas').getContext('2d');
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75 Redraw();
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76
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77 $('#canvas').mousedown(function(e) {
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78 var mouseX = e.pageX - this.offsetLeft;
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79 var mouseY = e.pageY - this.offsetTop;
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80
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81 paint = true;
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82 addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop);
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83 Redraw();
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84 });
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85
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86 $('#canvas').mousemove(function(e) {
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87 if(paint) {
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88 addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop, true);
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89 Redraw();
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90 }
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91 });
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92
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93 $('#canvas').mouseup(function(e) {
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94 paint = false;
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95 });
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96
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97 $('#canvas').mouseleave(function(e) {
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98 paint = false;
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99 });
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100 });