请问Java如何实现对.jpg图片的缩放显示?# Java - 爪哇娇娃
w*j
1 楼
比如在Frame里面有一个.jpg图片,
点"+" 可以放大显示图片, "-" 可以缩小显示图片.
Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
点"+" 可以放大显示图片, "-" 可以缩小显示图片.
Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
c*t
2 楼
Check java.awt.Graphics functions on image drawing.
【在 w****j 的大作中提到】
: 比如在Frame里面有一个.jpg图片,
: 点"+" 可以放大显示图片, "-" 可以缩小显示图片.
: Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
【在 w****j 的大作中提到】
: 比如在Frame里面有一个.jpg图片,
: 点"+" 可以放大显示图片, "-" 可以缩小显示图片.
: Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
g*g
3 楼
Like this
BufferedImage bufimg =ImageIO.read(file);
BufferedImage bufimg2 = new BufferedImage(width, height,bufimg.getType());
Graphics2D g2d = (Graphics2D) bufimg2.getGraphics();
g2d.scale((double) width /bufimg.getWidth(), (double) height /bufimg.
getHeight());
g2d.drawImage(bufimg,0,0,null);
Image img = bufimg2;
【在 w****j 的大作中提到】
: 比如在Frame里面有一个.jpg图片,
: 点"+" 可以放大显示图片, "-" 可以缩小显示图片.
: Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
BufferedImage bufimg =ImageIO.read(file);
BufferedImage bufimg2 = new BufferedImage(width, height,bufimg.getType());
Graphics2D g2d = (Graphics2D) bufimg2.getGraphics();
g2d.scale((double) width /bufimg.getWidth(), (double) height /bufimg.
getHeight());
g2d.drawImage(bufimg,0,0,null);
Image img = bufimg2;
【在 w****j 的大作中提到】
: 比如在Frame里面有一个.jpg图片,
: 点"+" 可以放大显示图片, "-" 可以缩小显示图片.
: Java有什么方法可以实现呢, 或者那里有相关资源, 多谢了!
c*t
4 楼
This approach is bad for several reasons
1. less control.
2. interfere with subsequent graphics manipulations.
3. potential black/white strip at the edge due to rounding.
Simply using Graphis.drawImage (Image img, int x, int y, int width,
int height, ImageObserver observer)
is good enough.
【在 g*****g 的大作中提到】
: Like this
: BufferedImage bufimg =ImageIO.read(file);
: BufferedImage bufimg2 = new BufferedImage(width, height,bufimg.getType());
: Graphics2D g2d = (Graphics2D) bufimg2.getGraphics();
: g2d.scale((double) width /bufimg.getWidth(), (double) height /bufimg.
: getHeight());
: g2d.drawImage(bufimg,0,0,null);
: Image img = bufimg2;
1. less control.
2. interfere with subsequent graphics manipulations.
3. potential black/white strip at the edge due to rounding.
Simply using Graphis.drawImage (Image img, int x, int y, int width,
int height, ImageObserver observer)
is good enough.
【在 g*****g 的大作中提到】
: Like this
: BufferedImage bufimg =ImageIO.read(file);
: BufferedImage bufimg2 = new BufferedImage(width, height,bufimg.getType());
: Graphics2D g2d = (Graphics2D) bufimg2.getGraphics();
: g2d.scale((double) width /bufimg.getWidth(), (double) height /bufimg.
: getHeight());
: g2d.drawImage(bufimg,0,0,null);
: Image img = bufimg2;
w*j
5 楼
Thanks for all replies, I will try that...
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