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J2ME中对Image的缩放
时间:2022-07-02 17:42:47 编辑:袖梨 来源:一聚教程网
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 thumb;
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;
}
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 thumb;
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;
}
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