【图片旋转】jack_606 Codelab记录帖

目标:鸿蒙模拟器上实现图片旋转
1.核心MainAbilitySlice2类文件如下：

public class MainAbilitySlice2 extends AbilitySlice{
private static final HiLogLabel LABEL_LOG = new HiLogLabel(3, 0xD001100, "MainAbilitySlice");
Image image;
PixelMap imagePixelMap;
Button whirlImageBtn;
Button cropImageBtn;
Button scaleImageBtn;
Button mirrorImageBtn;
private int whirlCount = 0;
private boolean isCorp = false;
private boolean isScale = false;
private boolean isMirror = false;
private float scaleX = 1.0f;
@Override
public void onStart(Intent intent) {
super.onStart(intent);
super.setUIContent(ResourceTable.Layout_ability_mains);
initView();
}
private void initView() {
if (findComponentById(ResourceTable.Id_whirl_image) instanceof Button) {
whirlImageBtn = (Button) findComponentById(ResourceTable.Id_whirl_image);
}
if (findComponentById(ResourceTable.Id_crop_image) instanceof Button) {
cropImageBtn = (Button) findComponentById(ResourceTable.Id_crop_image);
}
if (findComponentById(ResourceTable.Id_scale_image) instanceof Button) {
scaleImageBtn = (Button) findComponentById(ResourceTable.Id_scale_image);
}
if (findComponentById(ResourceTable.Id_mirror_image) instanceof Button) {
mirrorImageBtn = (Button) findComponentById(ResourceTable.Id_mirror_image);
}
if (findComponentById(ResourceTable.Id_image) instanceof Image) {
image = (Image) findComponentById(ResourceTable.Id_image);
}
whirlImageBtn.setClickedListener(new ButtonClick());
cropImageBtn.setClickedListener(new ButtonClick());
scaleImageBtn.setClickedListener(new ButtonClick());
mirrorImageBtn.setClickedListener(new ButtonClick());
}
private class ButtonClick implements Component.ClickedListener {
@Override
public void onClick(Component component) {
int btnId = component.getId();
switch (btnId) {
case ResourceTable.Id_whirl_image:
// 旋转图片
whirlCount++;
isCorp = false;
isScale = false;
isMirror = false;
imagePixelMap = getPixelMapFromResource(ResourceTable.Media_fengjing);
image.setPixelMap(imagePixelMap);
break;
case ResourceTable.Id_crop_image:
// 剪裁图片
whirlCount = 0;
isCorp = !isCorp;
isScale = false;
isMirror = false;
imagePixelMap = getPixelMapFromResource(ResourceTable.Media_fengjing);
image.setPixelMap(imagePixelMap);
break;
case ResourceTable.Id_scale_image:
// 缩放图片
whirlCount = 0;
isCorp = false;
isScale = !isScale;
isMirror = false;
imagePixelMap = getPixelMapFromResource(ResourceTable.Media_fengjing);
image.setPixelMap(imagePixelMap);
break;
case ResourceTable.Id_mirror_image:
// 镜像图片
whirlCount = 0;
isCorp = false;
isScale = false;
isMirror = true;
imagePixelMap = getPixelMapFromResource(ResourceTable.Media_fengjing);
mirrorImage(imagePixelMap);
image.setPixelMap(imagePixelMap);
break;
default:
break;
}
}
}
private void mirrorImage(PixelMap pixelMap) {
scaleX = -scaleX;
image.addDrawTask(
new Component.DrawTask() {
@Override
public void onDraw(Component component, Canvas canvas) {
if (isMirror) {
isMirror = false;
PixelMapHolder pmh = new PixelMapHolder(pixelMap);
canvas.scale(
scaleX,
1.0f,
(float) pixelMap.getImageInfo().size.width / 2,
(float) pixelMap.getImageInfo().size.height / 2);
canvas.drawPixelMapHolder(
pmh,
0,
0,
new Paint());
}
}
});
}
/**
* 通过图片ID返回PixelMap
*
* [url=home.php?mod=space&uid=3142012]@param[/url] resourceId 图片的资源ID
* [url=home.php?mod=space&uid=1141835]@Return[/url] 图片的PixelMap
*/
private PixelMap getPixelMapFromResource(int resourceId) {
InputStream inputStream = null;
try {
// 创建图像数据源ImageSource对象
inputStream = getContext().getResourceManager().getResource(resourceId);
ImageSource.SourceOptions srcOpts = new ImageSource.SourceOptions();
srcOpts.formatHint = "image/jpg";
ImageSource imageSource = ImageSource.create(inputStream, srcOpts);
// 设置图片参数
ImageSource.DecodingOptions decodingOptions = new ImageSource.DecodingOptions();
// 旋转
decodingOptions.rotateDegrees = 90 * whirlCount;
// 缩放
decodingOptions.desiredSize = new Size(isScale ? 512 : 0, isScale ? 384 : 0);
// 剪裁
decodingOptions.desiredRegion = new Rect(0, 0, isCorp ? 1024 : 0, isCorp ? 400 : 0);
decodingOptions.desiredPixelFormat = PixelFormat.ARGB_8888;
return imageSource.createPixelmap(decodingOptions);
} catch (IOException e) {
HiLog.info(LABEL_LOG, "IOException");
} catch (NotExistException e) {
HiLog.info(LABEL_LOG, "NotExistException");
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
HiLog.info(LABEL_LOG, "inputStream IOException");
}
}
}
return null;
}
@Override
public void onActive() {
super.onActive();
}
@Override
public void onForeground(Intent intent) {
super.onForeground(intent);
}
}