AddFromCanvas Method (ImageViewerItems)控制| HTML5 JavaScript帮助

addFromCanvas方法

ImageViewer.js< / div >

AddFromCanvas.html< / div >< / div >< div id ="GenericContainerEntry4524" class="GenericContainerEntry">

进口{ImageViewer_Example}从“. . / imageview”；出口类ImageViewerItems_AddFromCanvasExample {私人viewerExample;构造函数() {这.viewerExample =新ImageViewer_Example (这.run);｝私人run =(查看器:lt.Controls.ImageViewer) => {//设置空白，填充和布局查看器。viewLayout =新lt.Controls.ImageViewerVerticalViewLayout ();查看器。itemBorderThickness = 5;查看器。itemPadding = lt.Controls.ControlPadding.createAll(20);查看器。itemMargin = lt.Controls.ControlPadding.createAll(10);常量canvas = document.createElement(“画布”) HTMLCanvasElement;画布。宽度= 150;画布。高度= 150;常量CanvasRenderingContext2D = canvas.getContext(“二维”）;上下文。fillStyle ="rgba(0,0,255， .1)"；上下文。fillRect(0,0,150,150);上下文。fillStyle ="rgba(0,0,255， .5)"；上下文。fillRect(25,25,100,100);viewer.items。addFromCanvas(画布,lt.LeadSizeD。创建(96、96));｝｝

出口类ImageViewer_Example {//在这个例子中使用的LEADTOOLS ImageViewer受保护的imageViewer: lt.Controls.ImageViewer =零；//示例使用的一般状态值公共timesClicked:数量= 0;构造函数(回调?：（viewer: lt.Controls.ImageViewer) =>无效) {//设置LEADTOOLS license。用实际的许可证文件替换此文件lt.RasterSupport.setLicenseUri (“https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt”，“EVAL”，零）;//在imageViewerDiv元素中创建一个图像查看器常量imageViewerDiv = document.getElementById(“imageViewerDiv”）;常量createOptions: lt.Controls.ImageViewerCreateOptions =新lt.Controls.ImageViewerCreateOptions (imageViewerDiv);这.imageViewer =新lt.Controls.ImageViewer (createOptions);这.imageViewer。viewverticalalign = lt. controls . controlalign .center;这.imageViewer。viewhizontalalignment = lt.Controls.ControlAlignment.center;这.imageViewer。autoCreateCanvas =真正的；//增加Pan/Zoom交互模式//点击拖动可平移，CTRL-Click拖动可放大缩小这.imageViewer.interactiveModes.add (新lt.Controls.ImageViewerPanZoomInteractiveMode ());//加载图像这.imageViewer。imageUrl =“https://demo.leadtools.com/images/jpeg/cannon.jpg”；这.imageViewer.zoom (lt.Controls.ControlSizeMode。健康,9,这.imageViewer.defaultZoomOrigin);常量exampleButton = document.getElementById(“exampleButton”）;exampleButton.addEventListener (“点击”， () => {这.timesClicked + +;//运行示例如果(回调)回调(这.imageViewer);})；｝｝

进口{ImageViewer_Example}从“. . / imageview”；出口类ImageViewerItems_AddFromCanvasExample {viewerExample;构造函数(){这.viewerExample =新ImageViewer_Example (这.run);｝Run = (viewer) => {//设置空白，填充和布局查看器。viewLayout =新lt.Controls.ImageViewerVerticalViewLayout ();查看器。itemBorderThickness = 5;查看器。itemPadding = lt.Controls.ControlPadding.createAll(20);查看器。itemMargin = lt.Controls.ControlPadding.createAll(10);常量canvas = document.createElement(“画布”）;画布。宽度= 150;画布。高度= 150;常量context = canvas.getContext(“二维”）;上下文。fillStyle ="rgba(0,0,255， .1)"；上下文。fillRect(0,0,150,150);上下文。fillStyle ="rgba(0,0,255， .5)"；上下文。fillRect(25,25,100,100);viewer.items。addFromCanvas(画布,lt.LeadSizeD。创建(96、96));｝｝

出口类ImageViewer_Example {//在这个例子中使用的LEADTOOLS ImageViewerimageview =零；//示例使用的一般状态值timesClicked = 0;构造函数(回调){//设置LEADTOOLS license。用实际的许可证文件替换此文件lt.RasterSupport.setLicenseUri (“https://demo.leadtools.com/licenses/js/LEADTOOLSEVAL.txt”，“EVAL”，零）;//在imageViewerDiv元素中创建一个图像查看器常量imageViewerDiv = document.getElementById(“imageViewerDiv”）;常量createOptions =新lt.Controls.ImageViewerCreateOptions (imageViewerDiv);这.imageViewer =新lt.Controls.ImageViewer (createOptions);这.imageViewer。viewverticalalign = lt. controls . controlalign .center;这.imageViewer。viewhizontalalignment = lt.Controls.ControlAlignment.center;这.imageViewer。autoCreateCanvas =真正的；//增加Pan/Zoom交互模式//点击拖动可平移，CTRL-Click拖动可放大缩小这.imageViewer.interactiveModes.add (新lt.Controls.ImageViewerPanZoomInteractiveMode ());//加载图像这.imageViewer。imageUrl =“https://demo.leadtools.com/images/jpeg/cannon.jpg”；这.imageViewer.zoom (lt.Controls.ControlSizeMode。健康,9,这.imageViewer.defaultZoomOrigin);常量exampleButton = document.getElementById(“exampleButton”）;exampleButton.addEventListener (“点击”， () => {这.timesClicked + +;//运行示例如果(回调)回调(这.imageViewer);})；｝｝

< !doctype html >< html lang =“en”>控件示例| AddFromCanvas




< >头< script src =“https://code.jquery.com/jquery-2.2.4.min.js”诚信=“sha256-BbhdlvQf / xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44 = "crossorigin =“匿名”> < /脚本>< script src =“. . / . . / LT / Leadtools.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Controls.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Annotations.Engine.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Annotations.Designers.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Annotations.Rendering.Javascript.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Annotations.Automation.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.ImageProcessing.Main.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.ImageProcessing.Color.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.ImageProcessing.Core.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.ImageProcessing.Effects.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Document.js”> < /脚本>< script src =“. . / . . / LT / Leadtools.Document.Viewer.js”> < /脚本><时尚>身体{字体类型:“Segoe UI”无衬线;｝# imageViewerDiv {边框:1px实体#888;宽度:500 px;身高:500 px;background - color: # eee;｝> < /风格< !——所有的演示文件都被捆绑并附加到窗口——>< script src =“. . / . . / bundle.js”类型=“text / javascript”> < /脚本>< / >头身体< >按下并拖动图像平移
按住控制键并在图像上拖动或捏与用两个手指缩放在。< / p >< div ><按钮类型=“按钮”id =“exampleButton”> > < /按钮运行示例< / div >< div id =“imageViewerDiv”> < / div >< div id =“输出”> < / div >身体< / >< >脚本窗口。Onload = () => {常量示例=新window.examples.ImageViewerItems.AddFromCanvas ();};> < /脚本< / html >

addFromCanvas方法

参数

返回值

参考