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我正在研究黑莓中的图像裁剪。在我的应用程序中包含3个主要内容。
1)在屏幕上加载图像
2)选择裁剪区域的形状
3)在下一个屏幕上显示裁剪图像而不会丢失其形状
Step1:我可以完成图像加载部分
第二步:使用菜单我只需添加4种形状
1)Circle
2)Rectangle with rounded shape
3)Star
4)Cloud
当他点击任何菜单项时使用菜单,然后该特定形状图像将显示在屏幕上。
我们可以为该图像提供移动,因为我们必须让他选择图像的任何部分。
步骤3:修复位置后,我们将允许用户使用菜单进行裁剪。 当他点击菜单项“CROP”时。然后我们必须根据形状裁剪图像,图像应显示在下一个屏幕上
注意:以下代码仅适用于矩形形状,但我想 使用所有形状
这是我的示例代码::
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.Screen;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.XYEdges;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.container.VerticalFieldManager;
import net.rim.device.api.ui.decor.BackgroundFactory;
public class ClipMove extends MainScreen{
Bitmap circle_frame,rectangle_frame,star_frame,cloud_frame,image,selected_frame;
BitmapField frmae_field;
private int padding_x=0,padding_y=0;
private VerticalFieldManager vrt_mgr;
public ClipMove() {
//Here my shape images are transparent
circle_frame=Bitmap.getBitmapResource("circle.gif");
rectangle_frame=Bitmap.getBitmapResource("rect1.png");
star_frame=Bitmap.getBitmapResource("star.gif");
cloud_frame=Bitmap.getBitmapResource("cloud.gif");
//this is my actual image to crop
image=Bitmap.getBitmapResource("sample.jpg");
vrt_mgr=new VerticalFieldManager(){
protected void sublayout(int maxWidth, int maxHeight) {
super.sublayout(Display.getWidth(),Display.getHeight());
setExtent(Display.getWidth(),Display.getHeight());
}
};
vrt_mgr.setBackground(BackgroundFactory.createBitmapBackground(image));
add(vrt_mgr);
}
protected void makeMenu(Menu menu, int instance) {
super.makeMenu(menu, instance);
menu.add(new MenuItem("Rect",0,0) {
public void run() {
// TODO Auto-generated method stub
vrt_mgr.deleteAll();
selected_frame=rectangle_frame;
frmae_field=new BitmapField(rectangle_frame);
vrt_mgr.add(frmae_field);
vrt_mgr.invalidate();
}
});
menu.add(new MenuItem("Circle",0,0) {
public void run() {
// TODO Auto-generated method stub
vrt_mgr.deleteAll();
selected_frame=circle_frame;
frmae_field=new BitmapField(circle_frame);
vrt_mgr.add(frmae_field);
vrt_mgr.invalidate();
}
});
menu.add(new MenuItem("Star",0,0) {
public void run() {
// TODO Auto-generated method stub
vrt_mgr.deleteAll();
selected_frame=star_frame;
frmae_field=new BitmapField(star_frame);
vrt_mgr.add(frmae_field);
vrt_mgr.invalidate();
}
});
menu.add(new MenuItem("Cloud",0,0) {
public void run() {
// TODO Auto-generated method stub
vrt_mgr.deleteAll();
selected_frame=cloud_frame;
frmae_field=new BitmapField(cloud_frame);
vrt_mgr.add(frmae_field);
vrt_mgr.invalidate();
}
});
menu.add(new MenuItem("Crop",0,0) {
public void run() {
// TODO Auto-generated method stub
Field f=vrt_mgr.getField(0);
// XYRect rect=getFieldExtent(f);
XYRect rect=new XYRect(padding_x, padding_y,frmae_field.getBitmapWidth(),frmae_field.getBitmapHeight());
Bitmap crop = cropImage(image, rect.x, rect.y,
rect.width, rect.height);
synchronized (UiApplication.getEventLock()) {
UiApplication.getUiApplication().pushScreen(new sampleScreen(crop,selected_frame));
}
}
});
}
protected boolean navigationMovement(int dx, int dy, int status, int time) {
if(frmae_field!=null){
padding_x=padding_x+dx;
padding_y=padding_y+dy;
XYEdges edge=new XYEdges(padding_y, 0, 0, padding_x);
frmae_field.setPadding(edge);
vrt_mgr.invalidate();
return true;
}else {
return false;
}
}
public void DisplayMessage(final String str)
{
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.inform(str);
}
});
}
public XYRect getFieldExtent(Field fld) {
int cy = fld.getContentTop();
int cx = fld.getContentLeft();
Manager m = fld.getManager();
while (m != null) {
cy += m.getContentTop() - m.getVerticalScroll();
cx += m.getContentLeft() - m.getHorizontalScroll();
if (m instanceof Screen)
break;
m = m.getManager();
}
return new XYRect(cx, cy, fld.getContentWidth(), fld.getContentHeight());
}
// this logic only useful for rectangler shape
public Bitmap cropImage(Bitmap image, int x, int y, int width,int height) {
Bitmap result = new Bitmap(width, height);
Graphics g = Graphics.create(result);
g.drawBitmap(0, 0, width, height, image, x, y);
return result;
}
}
//this is my next screen to show the croped image
class sampleScreen extends MainScreen
{
VerticalFieldManager manager;
public sampleScreen(final Bitmap img,final Bitmap back) {
manager=new VerticalFieldManager(){
protected void paint(Graphics graphics) {
graphics.drawBitmap(0, 0, img.getWidth(), img.getHeight(), img, 0, 0);
super.paint(graphics);
}
protected void sublayout(int maxWidth, int maxHeight) {
super.sublayout( img.getWidth(), img.getHeight());
setExtent( img.getWidth(), img.getHeight());
}
};
BitmapField field=new BitmapField(back);
field.setPadding(0, 0, 0, 0);
manager.add(field);
add(manager);
}
}
我的屏幕截图:
答案 0 :(得分:6)
通过使用另一个虚拟图像,可以确定需要删除原始图像的哪些像素(我们可以使它们透明)。虽然它可能不是最佳解决方案,但它可以应用于我们可以在BlackBerry上绘制的任何几何图形。
检查以下步骤:
dummyImage
)
源图像(myImage
)。fillColor
)。myImage
的每个像素,如果dummyImage
的像素相同
包含fillColor
然后保持不变,否则制作此像素
通过为其指定零(0
)来完全透明。myImage
已经准备就绪,需要修剪此图片
透明像素去除。以下代码将在图像上应用圆形裁剪。 (但不会修剪透明像素)。
package mypackage;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.component.BitmapField;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.container.MainScreen;
class MyScreen extends MainScreen {
private Bitmap myImage = Bitmap.getBitmapResource("img/myImage.jpeg");
private BitmapField _bf;
public MyScreen() {
_bf = new BitmapField(myImage);
adjustBitmapMargin();
add(_bf);
}
private void adjustBitmapMargin() {
int x = (Display.getWidth() - myImage.getWidth()) / 2;
int y = (Display.getHeight() - myImage.getHeight()) / 2;
_bf.setMargin(y, 0, 0, x);
}
protected void makeMenu(Menu menu, int instance) {
menu.add(miCropCircle);
super.makeMenu(menu, instance);
}
private MenuItem miCropCircle = new MenuItem("Crop - Circle", 0, 0) {
public void run() {
cropImage();
}
};
private void cropImage() {
int width = myImage.getWidth();
int height = myImage.getHeight();
// get original data from the image
int myImageData[] = new int[width * height];
myImage.getARGB(myImageData, 0, width, 0, 0, width, height);
// get default color of a newly created bitmap
int defaultColors[] = new int[1 * 1];
(new Bitmap(1, 1)).getARGB(defaultColors, 0, 1, 0, 0, 1, 1);
int defaultColor = defaultColors[0];
int fillColor = Color.RED;
int diameter = 200;
// dummy data preparation
Bitmap dummyImage = new Bitmap(width, height);
Graphics dummyImageGraphics = Graphics.create(dummyImage);
dummyImageGraphics.setColor(fillColor);
int startX = width / 2 - diameter / 2;
int startY = height / 2 - diameter / 2;
dummyImageGraphics.fillArc(startX, startY, diameter, diameter, 0, 360);
int dummyData[] = new int[width * height];
dummyImage.getARGB(dummyData, 0, width, 0, 0, width, height);
// filling original data with transparent value.
int totalPixels = width * height;
for (int i = 0; i < totalPixels; i++) {
if (dummyData[i] == defaultColor) {
myImageData[i] = 0;
}
}
// set new data
myImage.setARGB(myImageData, 0, width, 0, 0, width, height);
// redraw screen
_bf.setBitmap(myImage);
adjustBitmapMargin();
invalidate();
// free up some memory here
defaultColors = null;
dummyImage = null;
dummyData = null;
dummyImageGraphics = null;
}
}
输出上面的代码: