wpf的inkcanvas就是一个画板，可以在上面随意涂鸦，每写上一笔，inkcanvas的strokes集合里就新增一个涂鸦对象，下面的代码演示了基本的操作。
效果图
xaml代码
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<window x:class="wpf_inkcanvas.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:wpf_inkcanvas" mc:ignorable="d" title="mainwindow" height="450" width="800"> <grid> <grid.rowdefinitions> <rowdefinition/> <rowdefinition height="auto"/> <rowdefinition height="auto"/> </grid.rowdefinitions> <image name="imgmeasure" horizontalalignment="center" stretch="uniform"/> <inkcanvas name="inkcanvasmeasure" editingmode="none" background="transparent" horizontalalignment="center" width="{binding elementname=imgmeasure, path=actualwidth}" height="{binding elementname=imgmeasure, path=actualheight}" > <!--mousedown="inkcanvasmeasure_mousedown" mousemove="inkcanvasmeasure_mousemove"--> <label content="{binding meainfo}" background="transparent" horizontalalignment="left" verticalalignment="top" margin="10" fontsize="18" foreground="red" ishittestvisible="false"/> </inkcanvas> <grid grid.row="1"> <grid.columndefinitions> <columndefinition/> <columndefinition/> <columndefinition/> <columndefinition/> <columndefinition/> </grid.columndefinitions> <radiobutton grid.column="0" content="绘制墨迹" click="radiobutton_click"/> <radiobutton grid.column="1" content="按点擦除" click="radiobutton_click"/> <radiobutton grid.column="2" content="按线擦除" click="radiobutton_click"/> <radiobutton grid.column="3" content="选中墨迹" click="radiobutton_click"/> <radiobutton grid.column="4" content="停止操作" click="radiobutton_click"/> </grid> <stackpanel grid.row="2" orientation="horizontal"> <button content="openfile" margin="5" horizontalalignment="left" fontsize="20" click="openfile_click"/> <button content="saveinkcanvas" margin="5" horizontalalignment="left" fontsize="20" click="saveinkcanvas_click"/> <button content="loadinkcanvas" margin="5" horizontalalignment="left" fontsize="20" click="loadinkcanvas_click"/> <button content="copyinkcanvas" margin="5" horizontalalignment="left" fontsize="20" click="copyinkcanvas_click"/> <button content="pasteinkcanvas" margin="5" horizontalalignment="left" fontsize="20" click="pasteinkcanvas_click"/> </stackpanel> </grid></window> |
后台代码
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using microsoft.win32;using system;using system.collections.generic;using system.io;using system.linq;using system.text;using system.threading.tasks;using system.windows;using system.windows.controls;using system.windows.data;using system.windows.documents;using system.windows.ink;using system.windows.input;using system.windows.media;using system.windows.media.imaging;using system.windows.navigation;using system.windows.shapes; namespace wpf_inkcanvas{ /// <summary> /// mainwindow.xaml 的交互逻辑 /// </summary> public partial class mainwindow : window { viewmodel viewmodel; public mainwindow() { initializecomponent(); drawingattributes drawingattributes = new drawingattributes { color = colors.red, width = 2, height = 2, stylustip = stylustip.rectangle, fittocurve = true, ishighlighter = false, ignorepressure = true, }; inkcanvasmeasure.defaultdrawingattributes = drawingattributes; viewmodel = new viewmodel { meainfo = "测试······", }; datacontext = viewmodel; } private void inkcanvasmeasure_mousedown(object sender, mousebuttoneventargs e) { } private void inkcanvasmeasure_mousemove(object sender, mouseeventargs e) { } private void openfile_click(object sender, routedeventargs e) { openfiledialog opendialog = new openfiledialog { filter = "image files (*.jpg)|*.jpg|image files (*.png)|*.png|image files (*.bmp)|*.bmp", title = "open image file" }; if (opendialog.showdialog() == true) { bitmapimage image = new bitmapimage(); image.begininit(); image.urisource = new uri(opendialog.filename, urikind.relativeorabsolute); image.endinit(); imgmeasure.source = image; } } private void radiobutton_click(object sender, routedeventargs e) { if ((sender as radiobutton).content.tostring() == "绘制墨迹") { inkcanvasmeasure.editingmode = inkcanvaseditingmode.ink; } else if ((sender as radiobutton).content.tostring() == "按点擦除") { inkcanvasmeasure.editingmode = inkcanvaseditingmode.erasebypoint; } else if ((sender as radiobutton).content.tostring() == "按线擦除") { inkcanvasmeasure.editingmode = inkcanvaseditingmode.erasebystroke; } else if ((sender as radiobutton).content.tostring() == "选中墨迹") { inkcanvasmeasure.editingmode = inkcanvaseditingmode.select; } else if ((sender as radiobutton).content.tostring() == "停止操作") { inkcanvasmeasure.editingmode = inkcanvaseditingmode.none; } } private void saveinkcanvas_click(object sender, routedeventargs e) { filestream filestream = new filestream("inkcanvas.isf", filemode.create, fileaccess.readwrite); inkcanvasmeasure.strokes.save(filestream); filestream.close(); } private void loadinkcanvas_click(object sender, routedeventargs e) { filestream filestream = new filestream("inkcanvas.isf", filemode.open, fileaccess.read); inkcanvasmeasure.strokes = new strokecollection(filestream); filestream.close(); } private void copyinkcanvas_click(object sender, routedeventargs e) { inkcanvasmeasure.copyselection(); } private void pasteinkcanvas_click(object sender, routedeventargs e) { inkcanvasmeasure.paste(); } }} |
viewmodel.cs代码
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using system;using system.collections.generic;using system.componentmodel;using system.linq;using system.text;using system.threading.tasks; namespace wpf_inkcanvas{ class viewmodel : inotifypropertychanged { public event propertychangedeventhandler propertychanged; protected virtual void onpropertychanged(string propertyname = null) { if (propertychanged != null) propertychanged.invoke(this, new propertychangedeventargs(propertyname)); } private string meainfo; public string meainfo { get => meainfo; set { meainfo = value; onpropertychanged("meainfo"); } } }} |
补充说明：将image和inkcanvas放到一个grid里，并且将inkcanvas的长宽绑定到image，这样image和inkcanvas的位置就是对应的，方便我后续在inkcanvas上提取image的感兴趣区域；inkcanvas里加了一个label可以实现类似图片上添加文字说明的功能，要设置label的ishittestvisible="false"，不然点击事件就没办法触发了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/u012366767/article/details/81265922
