Java tutorial
//package com.java2s; /* * Copyright (C) 2008 Romain Guy * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Matrix; import android.graphics.Rect; import android.graphics.RectF; public class Main { private static final Paint SCALE_PAINT = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG); private static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, Matrix m, float offset, boolean clipShadow, Paint paint) { int scaledWidth = width; int scaledHeight = height; final Canvas canvas = new Canvas(); canvas.translate(offset / 2.0f, offset / 2.0f); Bitmap bitmap; final Rect from = new Rect(x, y, x + width, y + height); final RectF to = new RectF(0, 0, width, height); if (m == null || m.isIdentity()) { bitmap = Bitmap.createBitmap(scaledWidth + (int) offset, scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888); paint = null; } else { RectF mapped = new RectF(); m.mapRect(mapped, to); scaledWidth = Math.round(mapped.width()); scaledHeight = Math.round(mapped.height()); bitmap = Bitmap.createBitmap(scaledWidth + (int) offset, scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888); canvas.translate(-mapped.left, -mapped.top); canvas.concat(m); } canvas.setBitmap(bitmap); canvas.drawRect(0.0f, 0.0f, width, height, paint); canvas.drawBitmap(source, from, to, SCALE_PAINT); return bitmap; } }