现代 API

简介

Historically, Aspose Slides has a dependency on java.awt and has in the public API the following classes from there:

As of version 24.4, this public API is declared deprecated.

In order to get rid of dependencies on these classes, we added the so-called “Modern API” - i.e. the API that should be used instead of the deprecated one, whose signatures contain dependencies on BufferedImage. Graphics2D is declared deprecated and its support is removed from the public Slides API.

Removal of the deprecated public API with dependencies on System.Drawing will be in release 24.8.

现代 API

Added the following classes and enums to the public API:

IImage - represents the raster or vector image.
ImageFormat - represents the file format of the image.
Images - methods to instantiate and work with the IImage class.

Please note that IImage is disposable (it implements the IDisposable class and its use should be wrapped in using or dispose-it in another convenient way).

A typical scenario of using the new API may look as follows:

var pres = new aspose.slides.Presentation();
try {
    var ppImage;
    // 实例化一个可释放的 IImage 实例，来自磁盘上的文件。
    var image = aspose.slides.Images.fromFile("image.png");
    try {
        // 通过向演示文稿的图像集合添加 IImage 实例来创建 PowerPoint 图像。
        ppImage = pres.getImages().addImage(image);
    } finally {
        if (image != null) image.dispose();
    }

    // 在第 1 张幻灯片上添加图片形状。
    pres.getSlides().get_Item(0).getShapes().addPictureFrame(aspose.slides.ShapeType.Rectangle, 10, 10, 100, 100, ppImage);

    var size = java.newInstanceSync("java.awt.Dimension", 1920, 1080);
    // 获取表示第 1 张幻灯片的 IImage 实例。
    var slideImage = pres.getSlides().get_Item(0).getImage(size);
    try {
        // 将图像保存到磁盘。
        slideImage.save("slide1.jpeg", aspose.slides.ImageFormat.Jpeg);
    } finally {
        if (slideImage != null) slideImage.dispose();
    }
} finally {
    if (pres != null) pres.dispose();
}

用现代 API 替换旧代码

In general, you will need to replace the call to the old method using ImageIO with the new one.

Old:

var imageio = java.import("javax.imageio.ImageIO");
var size = java.newInstanceSync("java.awt.Dimension", 1920, 1080);
var slideImage = pres.getSlides().get_Item(0).getThumbnail(size);
var file = java.newInstanceSync("java.io.File", "image.png");
imageio.write(slideImage, "PNG", file);

New:

var size = java.newInstanceSync("java.awt.Dimension", 1920, 1080);
var slideImage = pres.getSlides().get_Item(0).getImage(size);
slideImage.save("image.png", aspose.slides.ImageFormat.Png);
slideImage.dispose();

获取幻灯片缩略图

Code using a deprecated API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var slideImage = pres.getSlides().get_Item(0).getThumbnail();
    var imageio = java.import("javax.imageio.ImageIO");
    var file = java.newInstanceSync("java.io.File", "slide1.png");
    imageio.write(slideImage, "PNG", file);
} finally {
    if (pres != null) pres.dispose();
}

Modern API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var slideImage = pres.getSlides().get_Item(0).getImage();
    slideImage.save("slide1.png", aspose.slides.ImageFormat.Png);
    slideImage.dispose();
} finally {
    if (pres != null) pres.dispose();
}

获取形状缩略图

Code using a deprecated API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var shapeImage = pres.getSlides().get_Item(0).getShapes().get_Item(0).getThumbnail();
    var imageio = java.import("javax.imageio.ImageIO");
    var file = java.newInstanceSync("java.io.File", "shape.png");
    imageio.write(shapeImage, "PNG", file);
} finally {
    if (pres != null) pres.dispose();
}

Modern API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var shapeImage = pres.getSlides().get_Item(0).getShapes().get_Item(0).getImage();
    shapeImage.save("shape.png");
    shapeImage.dispose();
} finally {
    if (pres != null) pres.dispose();
}

获取演示文稿缩略图

Code using a deprecated API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var size = java.newInstanceSync("java.awt.Dimension", 1980, 1028);
    var bitmaps = pres.getThumbnails(new aspose.slides.RenderingOptions(), size);
    for (var index = 0; index < bitmaps.length; index++)
    {
        var thumbnail = bitmaps[index];
        var imageio = java.import("javax.imageio.ImageIO");
        var file = java.newInstanceSync("java.io.File", "slide" + index + ".png");
        imageio.write(thumbnail, "PNG", file);
    }
} finally {
    if (pres != null) pres.dispose();
}

Modern API:

var pres = new aspose.slides.Presentation("pres.pptx");
try {
    var size = java.newInstanceSync("java.awt.Dimension", 1980, 1028);
    var images = pres.getImages(new aspose.slides.RenderingOptions(), size);
    try
    {
        for (var index = 0; index < images.length; index++)
        {
            var thumbnail = images[index];
            thumbnail.save("slide" + index + ".png", aspose.slides.ImageFormat.Png);
        }
    }
    finally
    {
        images.forEach(item => {item.dispose();});
    }
} finally {
    if (pres != null) pres.dispose();
}

向演示文稿添加图片

Code using a deprecated API:

var pres = new aspose.slides.Presentation();
try {
    var imageio = java.import("javax.imageio.ImageIO");
    var file = java.newInstanceSync("java.io.File", "image.png");
    var bufferedImages = imageio.read(file);
    var ppImage = pres.getImages().addImage(bufferedImages);

    pres.getSlides().get_Item(0).getShapes().addPictureFrame(aspose.slides.ShapeType.Rectangle, 10, 10, 100, 100, ppImage);
} finally {
    if (pres != null) pres.dispose();
}

Modern API:

var pres = new aspose.slides.Presentation();
try {
    var image = aspose.slides.Images.fromFile("image.png");
    var ppImage = pres.getImages().addImage(image);
    image.dispose();

    pres.getSlides().get_Item(0).getShapes().addPictureFrame(aspose.slides.ShapeType.Rectangle, 10, 10, 100, 100, ppImage);
} finally {
    if (pres != null) pres.dispose();
}

将在现代 API 中被删除的方法及其替代方案

Presentation

方法签名	替代方法签名
public final BufferedImage[] getThumbnails(IRenderingOptions options)	public final IImage[] getImages(IRenderingOptions options)
public final BufferedImage[] getThumbnails(IRenderingOptions options, float scaleX, float scaleY)	public final IImage[] getImages(IRenderingOptions options, float scaleX, float scaleY)
public final BufferedImage[] getThumbnails(IRenderingOptions options, int[] slides)	public final IImage[] getImages(IRenderingOptions options, int[] slides)
public final BufferedImage[] getThumbnails(IRenderingOptions options, int[] slides, float scaleX, float scaleY)	public final IImage[] getImages(IRenderingOptions options, int[] slides, float scaleX, float scaleY)
public final BufferedImage[] getThumbnails(IRenderingOptions options, int[] slides, Dimension imageSize)	public final IImage[] getImages(IRenderingOptions options, int[] slides, Dimension imageSize)
public final BufferedImage[] getThumbnails(IRenderingOptions options, Dimension imageSize)	public final IImage[] getImages(IRenderingOptions options, Dimension imageSize)

Shape

方法签名	替代方法签名
public final BufferedImage getThumbnail()	public final IImage getImage()
public final BufferedImage getThumbnail(int bounds, float scaleX, float scaleY)	public final IImage getImage(int bounds, float scaleX, float scaleY)

Slide

方法签名	替代方法签名
public final BufferedImage getThumbnail()	public final IImage getImage()
public final BufferedImage getThumbnail(float scaleX, float scaleY)	public final IImage getImage(float scaleX, float scaleY)
public final BufferedImage getThumbnail(IRenderingOptions options)	public final IImage getImage(IRenderingOptions options)
public final BufferedImage getThumbnail(IRenderingOptions options, float scaleX, float scaleY)	public final IImage getImage(IRenderingOptions options)
public final BufferedImage getThumbnail(IRenderingOptions options, Dimension imageSize)	public final IImage getImage(IRenderingOptions options, Dimension imageSize)
public final BufferedImage getThumbnail(ITiffOptions options)	public final IImage getImage(ITiffOptions options)
public final BufferedImage getThumbnail(Dimension imageSize)	public final IImage getImage(Dimension imageSize)
public final void renderToGraphics(IRenderingOptions options, Graphics2D graphics)	Will be deleted completely
public final void renderToGraphics(IRenderingOptions options, Graphics2D graphics, float scaleX, float scaleY)	Will be deleted completely
public final void renderToGraphics(IRenderingOptions options, Graphics2D graphics, Dimension renderingSize)	Will be deleted completely

Output

方法签名	替代方法签名
public final IOutputFile add(String path, BufferedImage image)	public final IOutputFile add(String path, IImage image)

ImageCollection

方法签名	替代方法签名
public final PPImage addImage(BufferedImage image)	public final PPImage addImage(IImage image)

PPImage

方法签名	替代方法签名
public final BufferedImage getSystemImage()	public final IImage getImage()

PatternFormat

方法签名	替代方法签名
public final BufferedImage getTileImage(Color styleColor)	public final IImage getTile(Color styleColor)
public final BufferedImage getTileImage(Color background, Color foreground)	public final IImage getTile(Color background, Color foreground)

PatternFormatEffectiveData

方法签名	替代方法签名
public final java.awt.image.BufferedImage getTileImage(Color background, Color foreground)	public final IImage getTileIImage(Color background, Color foreground)

Graphics2D 支持将被取消

Methods with Graphics2D are declared deprecated and their support will be removed from the public API.

The part of the API that uses it will be removed: Slide

常见问题

IImage 相较于 Image/Bitmap 的实际优势是什么？

IImage 统一了光栅图和矢量图的操作，并通过 ImageFormat 简化了多种格式的保存。

Modern API 会影响生成缩略图的性能吗？

将 getThumbnail 切换为 getImage 并不会导致性能下降：新方法在保留渲染选项的同时，提供了相同的图像生成能力。具体的提升或下降取决于使用场景，但功能上两者是等价的。

3D 演示文稿通过 VBA 的演示文稿