design/designer-base/src/main/java/com/fr/base/svg/SVGIcon.java

package com.fr.base.svg;

import com.fr.general.IOUtils;

import javax.swing.Icon;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * SVG转化而来的Icon
 * @author Yvan
 * @version 10.0
 * Created by Yvan on 2020/12/17
 */
public class SVGIcon implements Icon {

    private BufferedImage image;

    private static final boolean HI_DPI_SURPORT = SystemScaleUtils.isJreHiDPIEnabled();

    public static final float SYSTEM_SCALE = SystemScaleUtils.sysScale();

    private static final String ICON_PREFIX = "/";

    public SVGIcon(BufferedImage image) {
        this.image = image;
    }

    private static Map<String, Icon> iconCache = new ConcurrentHashMap<>();

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        if (HI_DPI_SURPORT) {
            Graphics2D graphics = (Graphics2D) g.create(x, y, image.getWidth(null), image.getHeight(null));
            float scale = SYSTEM_SCALE;
            graphics.scale(1 / scale, 1 / scale);
            graphics.drawImage(image, 0, 0, null);
            graphics.scale(1.0D, 1.0D);
            graphics.dispose();
        } else {
            g.drawImage(image, x, y, null);
        }
    }

    @Override
    public int getIconWidth() {
        return HI_DPI_SURPORT ? (int) (image.getWidth() / SYSTEM_SCALE) : image.getWidth();
    }

    @Override
    public int getIconHeight() {
        return HI_DPI_SURPORT ? (int) (image.getHeight() / SYSTEM_SCALE) : image.getHeight();
    }

    /**
     * 读取高清图标
     * @param url
     * @return
     */
    public static Icon readSVGIcon(String url) {
        return readSVGIconWithCache(url, true);
    }

    public static Icon readSVGIconWithCache(String url, boolean cacheRead) {
        Icon icon = null;
        if (cacheRead) {
            icon = iconCache.get(url);
        }
        if (icon == null) {
            if (!url.startsWith(ICON_PREFIX)) {
                url = ICON_PREFIX + url;
            }
            BufferedImage image = (BufferedImage) SVGLoader.load(url);
            icon = image == null ? IOUtils.readIcon(url) : new SVGIcon(image);
            //只缓存svg图标
            if (image != null){
                iconCache.put(url, icon);
            }
        }
        return icon;
    }

    /**
     * 读取指定尺寸的图标
     * @param url 资源路径
     * @param width 宽度
     * @param height 高度
     * @return
     */
    public static Icon readSVGIcon(String url, float width, float height) {
        if (!url.startsWith(ICON_PREFIX)) {
            url = ICON_PREFIX + url;
        }
        BufferedImage image = (BufferedImage) SVGLoader.load(url, width, height);
        return image == null ? IOUtils.readIcon(url) : new SVGIcon(image);
    }
}