Android不规则封闭区域填充色彩的实例代码

/**
 * @param pixels 像素数组
 * @param w 宽度
 * @param h 高度
 * @param pixel 当前点的颜色
 * @param newColor 填充色
 * @param i 横坐标
 * @param j 纵坐标
 */
 private void fillColor01(int[] pixels, int w, int h, int pixel, int newColor, int i, int j)
 {
 int index = j * w + i;
 if (pixels[index] != pixel || i >= w || i < 0 || j < 0 || j >= h)
 return;
 pixels[index] = newColor;
 //上
 fillColor01(pixels, w, h, pixel, newColor, i, j - 1);
 //右
 fillColor01(pixels, w, h, pixel, newColor, i + 1, j);
 //下
 fillColor01(pixels, w, h, pixel, newColor, i, j + 1);
 //左
 fillColor01(pixels, w, h, pixel, newColor, i - 1, j);
 }

/**
 * @param pixels 像素数组
 * @param w 宽度
 * @param h 高度
 * @param pixel 当前点的颜色
 * @param newColor 填充色
 * @param i 横坐标
 * @param j 纵坐标
 */
 private void fillColor(int[] pixels, int w, int h, int pixel, int newColor, int i, int j)
 {
 mStacks.push(new Point(i, j));

 while (!mStacks.isEmpty())
 {
 Point seed = mStacks.pop();
 Log.e("TAG", "seed = " + seed.x + " , seed = " + seed.y);

 int index = seed.y * w + seed.x;

 pixels[index] = newColor;
 if (seed.y > 0)
 {
 int top = index - w;
 if (pixels[top] == pixel)
 {

 mStacks.push(new Point(seed.x, seed.y - 1));
 }
 }

 if (seed.y < h - 1)
 {
 int bottom = index + w;
 if (pixels[bottom] == pixel)
 {
 mStacks.push(new Point(seed.x, seed.y + 1));
 }
 }

 if (seed.x > 0)
 {
 int left = index - 1;
 if (pixels[left] == pixel)
 {
 mStacks.push(new Point(seed.x - 1, seed.y));
 }
 }

 if (seed.x < w - 1)
 {
 int right = index + 1;
 if (pixels[right] == pixel)
 {
 mStacks.push(new Point(seed.x + 1, seed.y));
 }
 }

 }
 }

public class ColourImageView extends ImageView
{

 private Bitmap mBitmap;
 /**
 * 边界的颜色
 */
 private int mBorderColor = -1;

 private boolean hasBorderColor = false;

 private Stack<Point> mStacks = new Stack<Point>();

 public ColourImageView(Context context, AttributeSet attrs)
 {
 super(context, attrs);

 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.ColourImageView);
 mBorderColor = ta.getColor(R.styleable.ColourImageView_border_color, -1);
 hasBorderColor = (mBorderColor != -1);

 L.e("hasBorderColor = " + hasBorderColor + " , mBorderColor = " + mBorderColor);

 ta.recycle();

 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
 {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);

 int viewWidth = getMeasuredWidth();
 int viewHeight = getMeasuredHeight();

 //以宽度为标准，等比例缩放view的高度
 setMeasuredDimension(viewWidth,
 getDrawable().getIntrinsicHeight() * viewWidth / getDrawable().getIntrinsicWidth());
 L.e("view's width = " + getMeasuredWidth() + " , view's height = " + getMeasuredHeight());

 //根据drawable，去得到一个和view一样大小的bitmap
 BitmapDrawable drawable = (BitmapDrawable) getDrawable();
 Bitmap bm = drawable.getBitmap();
 mBitmap = Bitmap.createScaledBitmap(bm, getMeasuredWidth(), getMeasuredHeight(), false);
 }

@Override
 public boolean onTouchEvent(MotionEvent event)
 {
 final int x = (int) event.getX();
 final int y = (int) event.getY();
 if (event.getAction() == MotionEvent.ACTION_DOWN)
 {
 //填色
 fillColorToSameArea(x, y);
 }

 return super.onTouchEvent(event);
 }

 /**
 * 根据x,y获得改点颜色，进行填充
 *
 * @param x
 * @param y
 */
 private void fillColorToSameArea(int x, int y)
 {
 Bitmap bm = mBitmap;

 int pixel = bm.getPixel(x, y);
 if (pixel == Color.TRANSPARENT || (hasBorderColor && mBorderColor == pixel))
 {
 return;
 }
 int newColor = randomColor();

 int w = bm.getWidth();
 int h = bm.getHeight();
 //拿到该bitmap的颜色数组
 int[] pixels = new int[w * h];
 bm.getPixels(pixels, 0, w, 0, 0, w, h);
 //填色
 fillColor(pixels, w, h, pixel, newColor, x, y);
 //重新设置bitmap
 bm.setPixels(pixels, 0, w, 0, 0, w, h);
 setImageDrawable(new BitmapDrawable(bm));

 }

/**
 * @param pixels 像素数组
 * @param w 宽度
 * @param h 高度
 * @param pixel 当前点的颜色
 * @param newColor 填充色
 * @param i 横坐标
 * @param j 纵坐标
 */
 private void fillColor(int[] pixels, int w, int h, int pixel, int newColor, int i, int j)
 {
 //步骤1：将种子点(x, y)入栈；
 mStacks.push(new Point(i, j));

 //步骤2：判断栈是否为空，
 // 如果栈为空则结束算法，否则取出栈顶元素作为当前扫描线的种子点(x, y)，
 // y是当前的扫描线；
 while (!mStacks.isEmpty())
 {


 /**
 * 步骤3：从种子点(x, y)出发，沿当前扫描线向左、右两个方向填充，
 * 直到边界。分别标记区段的左、右端点坐标为xLeft和xRight；
 */
 Point seed = mStacks.pop();
 //L.e("seed = " + seed.x + " , seed = " + seed.y);
 int count = fillLineLeft(pixels, pixel, w, h, newColor, seed.x, seed.y);
 int left = seed.x - count + 1;
 count = fillLineRight(pixels, pixel, w, h, newColor, seed.x + 1, seed.y);
 int right = seed.x + count;


 /**
 * 步骤4：
 * 分别检查与当前扫描线相邻的y - 1和y + 1两条扫描线在区间[xLeft, xRight]中的像素，
 * 从xRight开始向xLeft方向搜索，假设扫描的区间为AAABAAC（A为种子点颜色），
 * 那么将B和C前面的A作为种子点压入栈中，然后返回第（2）步；
 */
 //从y-1找种子
 if (seed.y - 1 >= 0)
 findSeedInNewLine(pixels, pixel, w, h, seed.y - 1, left, right);
 //从y+1找种子
 if (seed.y + 1 < h)
 findSeedInNewLine(pixels, pixel, w, h, seed.y + 1, left, right);
 }

 }

 /**
 * 在新行找种子节点
 *
 * @param pixels
 * @param pixel
 * @param w
 * @param h
 * @param i
 * @param left
 * @param right
 */
 private void findSeedInNewLine(int[] pixels, int pixel, int w, int h, int i, int left, int right)
 {
 /**
 * 获得该行的开始索引
 */
 int begin = i * w + left;
 /**
 * 获得该行的结束索引
 */
 int end = i * w + right;

 boolean hasSeed = false;

 int rx = -1, ry = -1;

 ry = i;

 /**
 * 从end到begin，找到种子节点入栈（AAABAAAB，则B前的A为种子节点）
 */
 while (end >= begin)
 {
 if (pixels[end] == pixel)
 {
 if (!hasSeed)
 {
 rx = end % w;
 mStacks.push(new Point(rx, ry));
 hasSeed = true;
 }
 } else
 {
 hasSeed = false;
 }
 end--;
 }
 }

 /**
 * 往右填色，返回填充的个数
 *
 * @return
 */
 private int fillLineRight(int[] pixels, int pixel, int w, int h, int newColor, int x, int y)
 {
 int count = 0;

 while (x < w)
 {
 //拿到索引
 int index = y * w + x;
 if (needFillPixel(pixels, pixel, index))
 {
 pixels[index] = newColor;
 count++;
 x++;
 } else
 {
 break;
 }

 }

 return count;
 }


 /**
 * 往左填色，返回填色的数量值
 *
 * @return
 */
 private int fillLineLeft(int[] pixels, int pixel, int w, int h, int newColor, int x, int y)
 {
 int count = 0;
 while (x >= 0)
 {
 //计算出索引
 int index = y * w + x;

 if (needFillPixel(pixels, pixel, index))
 {
 pixels[index] = newColor;
 count++;
 x--;
 } else
 {
 break;
 }

 }
 return count;
 }

 private boolean needFillPixel(int[] pixels, int pixel, int index)
 {
 if (hasBorderColor)
 {
 return pixels[index] != mBorderColor;
 } else
 {
 return pixels[index] == pixel;
 }
 }

 /**
 * 返回一个随机颜色
 *
 * @return
 */
 private int randomColor()
 {
 Random random = new Random();
 int color = Color.argb(255, random.nextInt(256), random.nextInt(256), random.nextInt(256));
 return color;
 }

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 xmlns:zhy="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 android:paddingBottom="@dimen/activity_vertical_margin"
 tools:context=".MainActivity">
 <com.zhy.colour_app_01.ColourImageView
 zhy:border_color="#FF000000"
 android:src="@drawable/image_007"
 android:background="#33ff0000"
 android:layout_width="match_parent"
 android:layout_centerInParent="true"
 android:layout_height="match_parent"/>

</RelativeLayout>


<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="ColourImageView">
 <attr name="border_color" format="color|reference"></attr>
 </declare-styleable>
</resources>