java - 如何获取整个帧的屏幕截图(包括剪掉的部分)

Question

我想保存整个框架的屏幕截图，但我的问题是当我尝试使用当前代码执行此操作时，如果我将框架的尺寸缩小，那么我只能保存框架的一部分可见的。

BufferedImage myImage = new BufferedImage(1250, 950,BufferedImage.TYPE_INT_RGB );

frame.paintAll(myImage.createGraphics());
try{
ImageIO.write(myImage, "jpg", new File(fileChooser.getSelectedFile().toString() + ".jpg"));
}catch (IOException exception){
    exception.printStackTrace();
}

Answer 1

Java GUI 组件的绘制方法仅在屏幕上可见或需要重新绘制的裁剪区域进行绘制。

试试这个 hack:创建 Graphics2D 包装器对象，将其所有方法调用转发到实际的 Graphics2D 实例，但不允许更改剪辑区域。

你需要做的是:

import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.RenderingHints.Key;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ImageObserver;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.RenderableImage;
import java.text.AttributedCharacterIterator;
import java.util.Map;

/**
 *
 * @author fortran
 */
public class Graphics2DWrapper extends Graphics2D {

    private final Graphics2D delegate;

    public Graphics2DWrapper(Graphics2D delegate) {
        this.delegate = delegate;
    }

    public String toString() {
        return delegate.toString();
    }

    public void setXORMode(Color c1) {
        delegate.setXORMode(c1);
    }

    public void setPaintMode() {
        delegate.setPaintMode();
    }

    public void setFont(Font font) {
        delegate.setFont(font);
    }

    public void setColor(Color c) {
        delegate.setColor(c);
    }

    public void setClip(Shape clip) {
        //ignore
    }

    public void setClip(int x, int y, int width, int height) {
        //ignore
    }

    public boolean hitClip(int x, int y, int width, int height) {
        return delegate.hitClip(x, y, width, height);
    }

    public FontMetrics getFontMetrics(Font f) {
        return delegate.getFontMetrics(f);
    }

    public FontMetrics getFontMetrics() {
        return delegate.getFontMetrics();
    }

    public Font getFont() {
        return delegate.getFont();
    }

    public Color getColor() {
        return delegate.getColor();
    }

    public Rectangle getClipRect() {
        return delegate.getClipRect();
    }

    public Rectangle getClipBounds(Rectangle r) {
        return delegate.getClipBounds(r);
    }

    public Rectangle getClipBounds() {
        return delegate.getClipBounds();
    }

    public Shape getClip() {
        return delegate.getClip();
    }

    public void finalize() {
        delegate.finalize();
    }

    public void fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight) {
        delegate.fillRoundRect(x, y, width, height, arcWidth, arcHeight);
    }

    public void fillRect(int x, int y, int width, int height) {
        delegate.fillRect(x, y, width, height);
    }

    public void fillPolygon(Polygon p) {
        delegate.fillPolygon(p);
    }

    public void fillPolygon(int[] xPoints, int[] yPoints, int nPoints) {
        delegate.fillPolygon(xPoints, yPoints, nPoints);
    }

    public void fillOval(int x, int y, int width, int height) {
        delegate.fillOval(x, y, width, height);
    }

    public void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
        delegate.fillArc(x, y, width, height, startAngle, arcAngle);
    }

    public void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight) {
        delegate.drawRoundRect(x, y, width, height, arcWidth, arcHeight);
    }

    public void drawRect(int x, int y, int width, int height) {
        delegate.drawRect(x, y, width, height);
    }

    public void drawPolyline(int[] xPoints, int[] yPoints, int nPoints) {
        delegate.drawPolyline(xPoints, yPoints, nPoints);
    }

    public void drawPolygon(Polygon p) {
        delegate.drawPolygon(p);
    }

    public void drawPolygon(int[] xPoints, int[] yPoints, int nPoints) {
        delegate.drawPolygon(xPoints, yPoints, nPoints);
    }

    public void drawOval(int x, int y, int width, int height) {
        delegate.drawOval(x, y, width, height);
    }

    public void drawLine(int x1, int y1, int x2, int y2) {
        delegate.drawLine(x1, y1, x2, y2);
    }

    public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, Color bgcolor, ImageObserver observer) {
        return delegate.drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, bgcolor, observer);
    }

    public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer) {
        return delegate.drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, observer);
    }

    public boolean drawImage(Image img, int x, int y, int width, int height, Color bgcolor, ImageObserver observer) {
        return delegate.drawImage(img, x, y, width, height, bgcolor, observer);
    }

    public boolean drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer) {
        return delegate.drawImage(img, x, y, bgcolor, observer);
    }

    public boolean drawImage(Image img, int x, int y, int width, int height, ImageObserver observer) {
        return delegate.drawImage(img, x, y, width, height, observer);
    }

    public boolean drawImage(Image img, int x, int y, ImageObserver observer) {
        return delegate.drawImage(img, x, y, observer);
    }

    public void drawChars(char[] data, int offset, int length, int x, int y) {
        delegate.drawChars(data, offset, length, x, y);
    }

    public void drawBytes(byte[] data, int offset, int length, int x, int y) {
        delegate.drawBytes(data, offset, length, x, y);
    }

    public void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
        delegate.drawArc(x, y, width, height, startAngle, arcAngle);
    }

    public void dispose() {
        delegate.dispose();
    }

    public Graphics create(int x, int y, int width, int height) {
        return delegate.create(x, y, width, height);
    }

    public Graphics create() {
        return delegate.create();
    }

    public void copyArea(int x, int y, int width, int height, int dx, int dy) {
        delegate.copyArea(x, y, width, height, dx, dy);
    }

    public void clipRect(int x, int y, int width, int height) {
        //ignore
    }

    public void clearRect(int x, int y, int width, int height) {
        delegate.clearRect(x, y, width, height);
    }

    public void translate(double tx, double ty) {
        delegate.translate(tx, ty);
    }

    public void translate(int x, int y) {
        delegate.translate(x, y);
    }

    public void transform(AffineTransform Tx) {
        delegate.transform(Tx);
    }

    public void shear(double shx, double shy) {
        delegate.shear(shx, shy);
    }

    public void setTransform(AffineTransform Tx) {
        delegate.setTransform(Tx);
    }

    public void setStroke(Stroke s) {
        delegate.setStroke(s);
    }

    public void setRenderingHints(Map<?, ?> hints) {
        delegate.setRenderingHints(hints);
    }

    public void setRenderingHint(Key hintKey, Object hintValue) {
        delegate.setRenderingHint(hintKey, hintValue);
    }

    public void setPaint(Paint paint) {
        delegate.setPaint(paint);
    }

    public void setComposite(Composite comp) {
        delegate.setComposite(comp);
    }

    public void setBackground(Color color) {
        delegate.setBackground(color);
    }

    public void scale(double sx, double sy) {
        delegate.scale(sx, sy);
    }

    public void rotate(double theta, double x, double y) {
        delegate.rotate(theta, x, y);
    }

    public void rotate(double theta) {
        delegate.rotate(theta);
    }

    public boolean hit(Rectangle rect, Shape s, boolean onStroke) {
        return delegate.hit(rect, s, onStroke);
    }

    public AffineTransform getTransform() {
        return delegate.getTransform();
    }

    public Stroke getStroke() {
        return delegate.getStroke();
    }

    public RenderingHints getRenderingHints() {
        return delegate.getRenderingHints();
    }

    public Object getRenderingHint(Key hintKey) {
        return delegate.getRenderingHint(hintKey);
    }

    public Paint getPaint() {
        return delegate.getPaint();
    }

    public FontRenderContext getFontRenderContext() {
        return delegate.getFontRenderContext();
    }

    public GraphicsConfiguration getDeviceConfiguration() {
        return delegate.getDeviceConfiguration();
    }

    public Composite getComposite() {
        return delegate.getComposite();
    }

    public Color getBackground() {
        return delegate.getBackground();
    }

    public void fill3DRect(int x, int y, int width, int height, boolean raised) {
        delegate.fill3DRect(x, y, width, height, raised);
    }

    public void fill(Shape s) {
        delegate.fill(s);
    }

    public void drawString(AttributedCharacterIterator iterator, float x, float y) {
        delegate.drawString(iterator, x, y);
    }

    public void drawString(AttributedCharacterIterator iterator, int x, int y) {
        delegate.drawString(iterator, x, y);
    }

    public void drawString(String str, float x, float y) {
        delegate.drawString(str, x, y);
    }

    public void drawString(String str, int x, int y) {
        delegate.drawString(str, x, y);
    }

    public void drawRenderedImage(RenderedImage img, AffineTransform xform) {
        delegate.drawRenderedImage(img, xform);
    }

    public void drawRenderableImage(RenderableImage img, AffineTransform xform) {
        delegate.drawRenderableImage(img, xform);
    }

    public void drawImage(BufferedImage img, BufferedImageOp op, int x, int y) {
        delegate.drawImage(img, op, x, y);
    }

    public boolean drawImage(Image img, AffineTransform xform, ImageObserver obs) {
        return delegate.drawImage(img, xform, obs);
    }

    public void drawGlyphVector(GlyphVector g, float x, float y) {
        delegate.drawGlyphVector(g, x, y);
    }

    public void draw3DRect(int x, int y, int width, int height, boolean raised) {
        delegate.draw3DRect(x, y, width, height, raised);
    }

    public void draw(Shape s) {
        delegate.draw(s);
    }

    public void clip(Shape s) {
        //ignore
    }

    public void addRenderingHints(Map<?, ?> hints) {
        delegate.addRenderingHints(hints);
    }
}

然后在您的代码中:

BufferedImage myImage = new BufferedImage(1250, 950,BufferedImage.TYPE_INT_RGB );
Graphics2D delegate = myImage.createGraphics();
delegate.setClip(0,0,1250,950);
Graphics2D graphics = new Graphics2DWrapper(delegate);
frame.paintAll(graphics);
try{
ImageIO.write(myImage, "jpg", new File(fileChooser.getSelectedFile().toString() + ".jpg"));
}catch (IOException exception){
    exception.printStackTrace();
}

尝试一下，然后告诉我们它是否有效。