Android开发实现图片平移、缩放、倒影及旋转功能的方法
本文实例讲述了Android开发实现图片平移、缩放、倒影及旋转功能的方法。分享给大家供大家参考,具体如下:
解析:
1)根据原来的图片创建新的图片
BitmapmodBm=Bitmap.createBitmap(bm.getWidth()+20,bm.getHeight()+20,bm.getConfig());
2)设置到画布
Canvascanvas=newCanvas(modBm);
3)使用矩阵进行平移…
Matrixmatrix=newMatrix(); matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2);
4)把改变后图片设置到
canvas.drawBitmap(bm,matrix,paint); imageView2.setImageBitmap(modBm);
示例代码:
1、平移:
publicclassTranslateImageActivityextendsActivity{ privateImageViewimageView1; privateImageViewimageView2; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_rotate); initViews(); } privatevoidinitViews(){ imageView1=(ImageView)findViewById(R.id.imageView1); imageView2=(ImageView)findViewById(R.id.imageView2); Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm0); imageView1.setImageBitmap(bm); BitmapmodBm=Bitmap.createBitmap(bm.getWidth()+20,bm.getHeight()+20,bm.getConfig()); Canvascanvas=newCanvas(modBm); Paintpaint=newPaint(); paint.setColor(Color.BLACK); paint.setAntiAlias(true); Matrixmatrix=newMatrix(); //matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2); matrix.setTranslate(20,20); matrix.postTranslate(20,20); canvas.drawBitmap(bm,matrix,paint); imageView2.setImageBitmap(modBm); } }
2、缩放
publicclassScaleImageActivityextendsBaseActivity{ privatestaticfinalintDOUBLE=2; privateImageViewiv1,iv2; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_scale_iamge); iv1=(ImageView)findViewById(R.id.imageView1); iv2=(ImageView)findViewById(R.id.imageView2); Bitmapb1=BitmapFactory.decodeResource(getResources(),R.drawable.p1); iv1.setImageBitmap(b1); Bitmapb2=Bitmap.createBitmap(b1.getWidth()*DOUBLE,b1.getHeight(),Config.ARGB_8888); Canvascanvas=newCanvas(b2); Matrixmatrix=newMatrix(); matrix.setValues(newfloat[]{ DOUBLE*1.0f,0,0,//x 0,1.0f,0,//y 0,0,1.0f//z }); canvas.drawBitmap(b1,matrix,newPaint()); iv2.setImageBitmap(b2); } }
3、倒影
publicclassShadeImageActivityextendsActivity{ privateImageViewimageView1; privateImageViewimageView2; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_rotate); initViews(); } privatevoidinitViews(){ imageView1=(ImageView)findViewById(R.id.imageView1); imageView2=(ImageView)findViewById(R.id.imageView2); Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm3); imageView1.setImageBitmap(bm); BitmapmodBm=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),bm.getConfig()); Canvascanvas=newCanvas(modBm); Paintpaint=newPaint(); paint.setColor(Color.BLACK); paint.setAntiAlias(true); Matrixmatrix=newMatrix(); //matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2); //matrix.setTranslate(20,20); //镜子效果 matrix.setScale(1,-1); matrix.postTranslate(0,bm.getHeight()); canvas.drawBitmap(bm,matrix,paint); imageView2.setImageBitmap(modBm); } }
4、旋转
publicclassRotateImageActivityextendsActivity{ privateImageViewimageView1; privateImageViewimageView2; @Override protectedvoidonCreate(BundlesavedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_image_rotate); initViews(); } privatevoidinitViews(){ imageView1=(ImageView)findViewById(R.id.imageView1); imageView2=(ImageView)findViewById(R.id.imageView2); Bitmapbm=BitmapFactory.decodeResource(getResources(),R.drawable.mm0); imageView1.setImageBitmap(bm); BitmapmodBm=Bitmap.createBitmap(bm.getWidth(),bm.getHeight(),bm.getConfig()); Canvascanvas=newCanvas(modBm); Paintpaint=newPaint(); paint.setColor(Color.BLACK); paint.setAntiAlias(true); Matrixmatrix=newMatrix(); matrix.setRotate(90,bm.getWidth()/2,bm.getHeight()/2); canvas.drawBitmap(bm,matrix,paint); imageView2.setImageBitmap(modBm); } }
希望本文所述对大家Android程序设计有所帮助。