调整 EPS 大小 | C++ API 解决方案

概述

本文介绍如何使用 C++ 调整 EPS 文件大小。内容涵盖以下主题：

C++ 调整 EPS 文件大小说明

调整图像大小是指更改图像的一个或两个尺寸（宽度和高度）的操作。图像内容保持不变，但图像本身可以根据新的宽度和高度值进行缩放。如果宽度和高度按比例增加，EPS 图像的显示效果会放大，否则会缩小。如果宽度和高度的变化不成比例，则 EPS 图像的显示效果会在某些方面被压缩或拉长。由于我们的解决方案并非针对内容，而是针对 EPS 文件的标题和设置部分，因此 EPS 文件的体积几乎保持不变。要设置 EPS 图像显示效果的新尺寸，通常需要了解其现有尺寸并选择用于指定新尺寸的单位。单位可以是磅（1/72 英寸）、英寸、毫米、厘米和百分比。因此，在 C++ 中调整 EPS 图像大小的步骤如下：

使用包含 EPS 文件的输入流初始化 PsDocument 对象。
使用静态方法 ExtractEpsSize 提取图像的现有大小。
为生成的 EPS 文件创建输出流。
使用静态方法 ResizeEps，以选定的单位调整 PsDocument 对象的大小，使其达到新的大小。

您可以通过免费在线 Resize EPS 检查 Aspose.Page EPS Resize 的质量并查看结果，然后使用我们的 EPS Viewer 查看生成的 EPS 文件

在 C++ 中，使用 Points 设置 EPS Resize 的新尺寸

在以下 C++ 代码片段中，图像的新尺寸由 Points（1/72 英寸）设置：

 1// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
 2
 3    // The path to the documents directory.
 4    System::String dataDir = RunExamples::GetDataDir_WorkingWithEPS();
 5    
 6    //Create an input stream for EPS file
 7    {
 8        System::SharedPtr<System::IO::Stream> inputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
 9        // Clearing resources under 'using' statement
10        System::Details::DisposeGuard<1> __dispose_guard_1({ inputEpsStream});
11        // ------------------------------------------
12        
13        try
14        {
15            //Initialize PsDocument object with input stream
16            System::SharedPtr<PsDocument> doc = System::MakeObject<PsDocument>(inputEpsStream);
17            
18            //Get size of EPS image
19            System::Drawing::Size oldSize = doc->ExtractEpsSize();
20            
21            //Create an output stream for resized EPS
22            {
23                System::SharedPtr<System::IO::Stream> outputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"output_resize_points.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
24                // Clearing resources under 'using' statement
25                System::Details::DisposeGuard<1> __dispose_guard_0({ outputEpsStream});
26                // ------------------------------------------
27                
28                try
29                {
30                    //Increase EPS size in 2 times and save to the output stream
31                    doc->ResizeEps(outputEpsStream, System::Drawing::SizeF(static_cast<float>(oldSize.get_Width() * 2), static_cast<float>(oldSize.get_Height() * 2)), Aspose::Page::Units::Points);
32                }
33                catch(...)
34                {
35                    __dispose_guard_0.SetCurrentException(std::current_exception());
36                }
37            }
38        }
39        catch(...)
40        {
41            __dispose_guard_1.SetCurrentException(std::current_exception());
42        }
43    }

对于 Linux、MacOS 和其他非 Windows 操作系统，我们建议使用我们的 Aspose.Page.Drawing Nuget 软件包。它使用 Aspose.Drawing 后端，而不是 System.Drawing 系统库。因此，请导入 Aspose.Page.Drawing 命名空间，而不是 System.Drawing 命名空间。在以上和以下代码片段中，将使用 Aspose.Page.Drawing.Size 代替 System.Drawing.Size。我们在 GitHub 上的代码示例包含所有必要的替换。

使用 C++ 调整 EPS 大小，以英寸为单位设置新尺寸

在以下 C++ 代码片段中，图像的新尺寸以英寸为单位设置：

 1// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
 2
 3    // The path to the documents directory.
 4    System::String dataDir = RunExamples::GetDataDir_WorkingWithEPS();
 5    
 6    //Create an input stream for EPS file
 7    {
 8        System::SharedPtr<System::IO::Stream> inputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
 9        // Clearing resources under 'using' statement
10        System::Details::DisposeGuard<1> __dispose_guard_1({ inputEpsStream});
11        // ------------------------------------------
12        
13        try
14        {
15            //Initialize PsDocument object with input stream
16            System::SharedPtr<PsDocument> doc = System::MakeObject<PsDocument>(inputEpsStream);
17            
18            //Get size of EPS image
19            System::Drawing::Size oldSize = doc->ExtractEpsSize();
20            
21            //Create an output stream for resized EPS
22            {
23                System::SharedPtr<System::IO::Stream> outputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"output_resize_inches.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
24                // Clearing resources under 'using' statement
25                System::Details::DisposeGuard<1> __dispose_guard_0({ outputEpsStream});
26                // ------------------------------------------
27                
28                try
29                {
30                    //Save EPS to the output stream with new size assigned in inches
31                    doc->ResizeEps(outputEpsStream, System::Drawing::SizeF(5.791f, 3.625f), Aspose::Page::Units::Inches);
32                }
33                catch(...)
34                {
35                    __dispose_guard_0.SetCurrentException(std::current_exception());
36                }
37            }
38        }
39        catch(...)
40        {
41            __dispose_guard_1.SetCurrentException(std::current_exception());
42        }
43    }

在 C++ 中调整 EPS 图像尺寸，以毫米为单位

以下 C++ 代码片段中，图像的新尺寸以毫米为单位设置：

 1// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
 2
 3    // The path to the documents directory.
 4    System::String dataDir = RunExamples::GetDataDir_WorkingWithEPS();
 5    
 6    //Create an input stream for EPS file
 7    {
 8        System::SharedPtr<System::IO::Stream> inputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
 9        // Clearing resources under 'using' statement
10        System::Details::DisposeGuard<1> __dispose_guard_1({ inputEpsStream});
11        // ------------------------------------------
12        
13        try
14        {
15            //Initialize PsDocument object with input stream
16            System::SharedPtr<PsDocument> doc = System::MakeObject<PsDocument>(inputEpsStream);
17            
18            //Get size of EPS image
19            System::Drawing::Size oldSize = doc->ExtractEpsSize();
20            
21            //Create an output stream for resized EPS
22            {
23                System::SharedPtr<System::IO::Stream> outputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"output_resize_mms.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
24                // Clearing resources under 'using' statement
25                System::Details::DisposeGuard<1> __dispose_guard_0({ outputEpsStream});
26                // ------------------------------------------
27                
28                try
29                {
30                    //Save EPS to the output stream with new size assigned in millimeters
31                    doc->ResizeEps(outputEpsStream, System::Drawing::SizeF(196.0f, 123.0f), Aspose::Page::Units::Millimeters);
32                }
33                catch(...)
34                {
35                    __dispose_guard_0.SetCurrentException(std::current_exception());
36                }
37            }
38        }
39        catch(...)
40        {
41            __dispose_guard_1.SetCurrentException(std::current_exception());
42        }
43    }

在 C++ 中通过 Percents 设置 EPS 图像的新尺寸

以下 C++ 代码片段中，图像的新尺寸由 Percents 设置：

 1// For complete examples and data files, please go to https://github.com/aspose-page/Aspose.Page-for-C
 2
 3    // The path to the documents directory.
 4    System::String dataDir = RunExamples::GetDataDir_WorkingWithEPS();
 5    
 6    //Create an input stream for EPS file
 7    {
 8        System::SharedPtr<System::IO::Stream> inputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"input.eps", System::IO::FileMode::Open, System::IO::FileAccess::Read);
 9        // Clearing resources under 'using' statement
10        System::Details::DisposeGuard<1> __dispose_guard_1({ inputEpsStream});
11        // ------------------------------------------
12        
13        try
14        {
15            //Initialize PsDocument object with input stream
16            System::SharedPtr<PsDocument> doc = System::MakeObject<PsDocument>(inputEpsStream);
17            
18            //Get size of EPS image
19            System::Drawing::Size oldSize = doc->ExtractEpsSize();
20            
21            //Create an output stream for resized EPS
22            {
23                System::SharedPtr<System::IO::Stream> outputEpsStream = System::MakeObject<System::IO::FileStream>(dataDir + u"output_resize_percents.eps", System::IO::FileMode::Create, System::IO::FileAccess::Write);
24                // Clearing resources under 'using' statement
25                System::Details::DisposeGuard<1> __dispose_guard_0({ outputEpsStream});
26                // ------------------------------------------
27                
28                try
29                {
30                    //Save EPS to the output stream with new size assigned in percents
31                    doc->ResizeEps(outputEpsStream, System::Drawing::SizeF(200.0f, 200.0f), Aspose::Page::Units::Percents);
32                }
33                catch(...)
34                {
35                    __dispose_guard_0.SetCurrentException(std::current_exception());
36                }
37            }
38        }
39        catch(...)
40        {
41            __dispose_guard_1.SetCurrentException(std::current_exception());
42        }
43    }

请参阅使用 Java 和 C++ 调整 EPS 大小。

初始 EPS 图像

初始图像

调整大小的 EPS 图像

调整大小的图像

在我们的调整 EPS 大小 Web 应用程序上在线评估调整 EPS 大小。您可以在几秒钟内调整 EPS 文件大小并下载结果。

您可以从 GitHub 下载示例和数据文件。

裁剪 EPS 使用 PS 文档