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android 关于图片缩放，旋转的简单应用
右转
private void right() {
// TODO Auto-generated method stub
int bmpW = bm.getWidth() ;
int bmpH = bm.getHeight() ;
double scale =1 ;
scaleW = (float)(scaleW*scale);
scaleH = (float)(scaleH*scale);
Matrix mt =new Matrix ();
mt .postScale(scaleW, scaleH);
mt.setRotate(curDegrees=curDegrees+5);
Bitmap bitmap= Bitmap.createBitmap(bm, 0, 0, bmpW, bmpH, mt, true);
iv.setImageBitmap(bitmap);
}左转
private void left() {
int bmpW = bm.getWidth() ;
int bmpH = bm.getHeight() ;
double scale =1 ;
scaleW = (float)(scaleW*scale);
scaleH = (float)(scaleH*scale);
Matrix mt =new Matrix ();
mt .postScale(scaleW, scaleH);
mt.setRotate(curDegrees=curDegrees-5);
Bitmap bitmap= Bitmap.createBitmap(bm, 0, 0, bmpW, bmpH, mt, true);
iv.setImageBitmap(bitmap);
}缩小 private void small() {
int width =bm.getWidth() ;
int height = bm.getHeight() ;
double scale = 0.8;
scaleW= (float) (scale*scaleW) ;
scaleH = (float) (scaleH*scale) ;
Matrix mt =new Matrix ();
mt.postScale(scaleW, scaleH);
Bitmap resizebmp = Bitmap.createBitmap(bm,0,0,width,height,mt,true);
iv.setImageBitmap(resizebmp);
}放大
private void big() {
int bmpW = bm.getWidth() ;
int bmpH = bm.getHeight() ;
double scale =1.25 ;
scaleW = (float) (scaleW*scale) ;
scaleH = (float) (scaleH * scale) ;
Matrix mt = new Matrix () ;
mt.postScale(scaleW, scaleH) ;
Bitmap bmp = Bitmap.createBitmap(bm, 0, 0, bmpW, bmpH, mt, true) ;
iv.setImageBitmap(bmp);
}android 关于图片缩放，旋转的简单应用
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