在Java 9中,引入了新的多分辨率图像API,该API支持具有不同分辨率变量的多个图像。以下是多分辨率图像的主要操作。
Image getResolutionVariant(double destImageWidth,double destImageHeight) - 获取特定图像,该图像是在指定尺寸下代表此图像的最佳变体。
List<Image> getResolutionVariants() - 获取所有分辨率变量的可读列表。
import java.io.IOException; import java.net.URL; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.List; import java.awt.Image; import java.awt.image.MultiResolutionImage; import java.awt.image.BaseMultiResolutionImage; import javax.imageio.ImageIO; public class Tester { public static void main(String[] args) throws IOException, MalformedURLException { List<String> imgUrls=List.of("http://www.learnfk.com/java9/images/logo.png", "http://www.learnfk.com/java9/images/mini_logo.png", "http://www.learnfk.com/java9/images/large_logo.png"); List<Image> images=new ArrayList<Image>(); for (String url : imgUrls) { images.add(ImageIO.read(new URL(url))); } //将所有图像读入一个多分辨率图像 MultiResolutionImage multiResolutionImage= new BaseMultiResolutionImage(images.toArray(new Image[0])); //获取所有图像的变体 List<Image> variants=multiResolutionImage.getResolutionVariants(); System.out.println("Total number of images: " + variants.size()); for (Image img : variants) { System.out.println(img); } //获取每个指示大小的分辨率特定图像变体 Image variant1=multiResolutionImage.getResolutionVariant(156, 45); System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 156, 45, variant1.getWidth(null), variant1.getHeight(null)); Image variant2=multiResolutionImage.getResolutionVariant(311, 89); System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 311, 89, variant2.getWidth(null), variant2.getHeight(null)); Image variant3=multiResolutionImage.getResolutionVariant(622, 178); System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 622, 178, variant3.getWidth(null), variant3.getHeight(null)); Image variant4=multiResolutionImage.getResolutionVariant(300, 300); System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 300, 300, variant4.getWidth(null), variant4.getHeight(null)); } }
运行上面代码输出
链接:https://www.learnfk.comhttps://www.learnfk.com/java/java9-multiresolution-image-api.html
来源:LearnFk无涯教程网
Total number of images: 3 BufferedImage@7ce6a65d: type=6 ColorModel: #pixelBits=32 numComponents=4 color space =java.awt.color.ICC_ColorSpace@548ad73b transparency=3 has alpha=true isAlphaPre=false ByteInterleavedRaster: width =311 height=89 #numDataElements 4 dataOff[0]=3 BufferedImage@4c762604: type=6 ColorModel: #pixelBits=32 numComponents=4 color space =java.awt.color.ICC_ColorSpace@548ad73b transparency=3 has alpha=true isAlphaPre=false ByteInterleavedRaster: width =156 height=45 #numDataElements 4 dataOff[0]=3 BufferedImage@2641e737: type=6 ColorModel: #pixelBits=32 numComponents=4 color space =java.awt.color.ICC_ColorSpace@548ad73b transparency=3 has alpha=true isAlphaPre=false ByteInterleavedRaster: width =622 height=178 #numDataElements 4 dataOff[0]=3 Image for destination[156,45]: [311,89] Image for destination[311,89]: [311,89] Image for destination[622,178]: [622,178] Image for destination[300,300]: [622,178]
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