[转]J2ME中对Image的缩放

 

a sniplet from the article "Taking Pictures with MMAPI"

http://developers.sun.com/techtopics/mobility/midp/articles/picture/

  clapton_xp@hotmail.com

创建缩略图

MIDP2.0中可以对图片中的像素进行操作，在MIDP1.0中则不然。本例用Graphics.setClip()实现每一次对一个像素进行绘制。

private Image createThumbnail(Image image) {   int sourceWidth = image.getWidth();   int sourceHeight = image.getHeight();     int thumbWidth = 64;   int thumbHeight = -1;     if (thumbHeight == -1)     thumbHeight = thumbWidth * sourceHeight / sourceWidth;     Image thumb = Image.createImage(thumbWidth, thumbHeight);   Graphics g = thumb.getGraphics();     for (int y = 0; y < thumbHeight; y++) {     for (int x = 0; x < thumbWidth; x++) {       g.setClip(x, y, 1, 1);       int dx = x * sourceWidth / thumbWidth;       int dy = y * sourceHeight / thumbHeight;       g.drawImage(image, x - dx, y - dy,           Graphics.LEFT | Graphics.TOP);     }   }     Image immutableThumb = Image.createImage(thumb);     return immutableThumb; }