火焰效果程序源码.zip

package cn.vaga.blazedemo; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.SurfaceHolder; import android.view.SurfaceView; public class BlazeView extends SurfaceView implements SurfaceHolder.Callback { private int backWidth; private int backHeight; private Bitmap bgImage = null; private boolean firstLoad = false; BlazeThread mBlazeThread = new BlazeThread(); SurfaceHolder mSurfaceHolder = null; private static RandNums randNums; public static int[] palette = new int[512]; private int[] blazeBuf; private int[] blazePalItems; private Paint paint = new Paint(); static { int index = 0; int cIndex = 0; double alpha = 0.0; randNums = new RandNums(); // 生成调色板 palette[0] = Color.argb(0, 0, 0, 0); // 0 黑色的 for (index = 1; index < 70; index++) { cIndex = index >> 1; palette[index] = Color.argb((int)(alpha++ / 512 * 255), cIndex + 25, randNums.nextInt() % 10, randNums.nextInt() % 10); // 1-34 // 接近于黑色的 } for (index = 70; index < 110; index++) { cIndex = index >> 1; palette[index] = Color.argb((int)(alpha++ / 512 * 255), cIndex + 25, cIndex - 25, randNums .nextInt() % 10); // 35-54 接近于黑色的，比上面的要淡一些 } for (index = 110; index < 190; index++) { cIndex = index >> 1; palette[index] = Color.argb((int)(alpha++ / 512 * 255), cIndex + 75, cIndex, randNums .nextInt() % 5); // 55-94 接近于深橘红色 } for (index = 190; index < 400; index++) { cIndex = index >> 1; palette[index] = Color.argb((int)(alpha++ / 512 * 255), (cIndex + 70 > 255) ? 255 : (cIndex + 70), cIndex + 30, randNums .nextInt() % 10); // 95-199 橘红色的 } for (index = 400; index < 512; index++) { cIndex = index >> 1; palette[index] = Color.argb((int)(alpha++ / 512 * 255), cIndex, cIndex - randNums.nextInt() % 25, randNums.nextInt() % 5); // 200-254 // 接近于黄色 } } public BlazeView(Context context) { super(context); mSurfaceHolder = getHolder(); mSurfaceHolder.addCallback(this); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { if (!firstLoad) { bgImage = BitmapFactory.decodeResource(this.getResources(), R.drawable.bg); bgImage = Bitmap.createScaledBitmap(bgImage, w, h, false);// 缩放而已 backWidth = bgImage.getWidth(); backHeight = bgImage.getHeight(); blazeBuf = new int[backWidth * backHeight]; blazePalItems = new int[backWidth * backHeight]; for (int i = 0; i < backWidth * backHeight; ++i) { blazeBuf[i] = 0; blazePalItems[i] = 0; } firstLoad = true; } } class BlazeThread extends Thread { boolean running = true; public void setRunning(boolean running) { this.running = running; } @Override public void run() { Canvas c = null; while (running) { c = mSurfaceHolder.lockCanvas(); doDraw(c); makFire(); mSurfaceHolder.unlockCanvasAndPost(c); } } } private void makFire() { int x = 0, y = 0; int fireoffset = 0; int firevalue = 0; int backWidthAdd1 = backWidth + 1; int backWidthSub1 = backWidth - 1; int heightSize = backHeight - 1; int widthSize = backWidth - 1; int tmpVal = 0; // 绘制最后一行。。。 int wmh = backWidth * (backHeight - 2) - 1; int ranV = randNums.nextInt(); for (x = 0; x < backWidth; x += ranV % 3) { tmpVal = wmh + x; if (ranV % 2 != 0) blazePalItems[tmpVal] = 511; else blazePalItems[tmpVal] = 0; blazeBuf[tmpVal] = palette[blazePalItems[tmpVal]]; ranV = randNums.nextInt(); } // 计算环境像素 for (y = 1; y < heightSize; ++y) { for (x = 1; x < widthSize; ++x) { fireoffset = (y * backWidth) + x; // blazeBuf[fireoffset] = palette[(int)(x * 1.0f / widthSize * 512)]; firevalue = (( blazePalItems[fireoffset - backWidth] + blazePalItems[fireoffset + backWidth] + blazePalItems[fireoffset + 1] + blazePalItems[fireoffset - 1] + blazePalItems[fireoffset - backWidthAdd1] + blazePalItems[fireoffset - backWidthSub1] + blazePalItems[fireoffset + backWidthSub1] + blazePalItems[fireoffset + backWidthAdd1]) >> 3); if (firevalue > 0) // is it black? { --firevalue; // Nope. Beam me down Scotty. tmpVal = fireoffset - backWidth; blazePalItems[tmpVal] = firevalue; blazeBuf[tmpVal] = palette[blazePalItems[tmpVal]]; // Plot that // new color // on the above pixel // remember the typewriter analogy } } } } protected void doDraw(Canvas canvas) { canvas.drawBitmap(blazeBuf, 0, backWidth, 0, 0, backWidth, backHeight, true, paint); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { mBlazeThread.setRunning(true); mBlazeThread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { boolean retry = true; mBlazeThread.setRunning(false); // 非暴力关闭线程，直到此次该线程运行结束之前，主线程停止运行，以防止Surface被重新激活 while (retry) { try { mBlazeThread.join(); // 阻塞current // Thread(当前执行线程)直到被调用线程(thread)完成。 retry = false; } catch (InterruptedException e) { } } } }