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@pqpo
pqpo committed Aug 9, 2017
1 parent 0a457a2 commit a75be1d
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Showing 3 changed files with 112 additions and 18 deletions.
8 changes: 8 additions & 0 deletions smartcropperlib/src/main/cpp/Scanner.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,19 +20,26 @@ Scanner::~Scanner() {
}

vector<Point> Scanner::scanPoint() {
//缩小图片尺寸
Mat image = resizeImage();
//预处理图片
Mat scanImage = preprocessImage(image);
vector<vector<Point>> contours;
//提取边框
findContours(scanImage, contours, RETR_EXTERNAL, CHAIN_APPROX_NONE);
//按面积排序
std::sort(contours.begin(), contours.end(), sortByArea);
vector<Point> result;
if (contours.size() > 0) {
vector<Point> contour = contours[0];
double arc = arcLength(contour, true);
vector<Point> outDP;
//多变形逼近
approxPolyDP(Mat(contour), outDP, 0.02*arc, true);
//筛选去除相近的点
vector<Point> selectedPoints = selectPoints(outDP, 1);
if (selectedPoints.size() != 4) {
//如果筛选出来之后不是四边形，那么使用最小矩形包裹
RotatedRect rect = minAreaRect(contour);
Point2f p[4];
rect.points(p);
Expand All @@ -48,6 +55,7 @@ vector<Point> Scanner::scanPoint() {
p.y *= resizeScale;
}
}
// 按左上，右上，右下，左下排序
return sortPointClockwise(result);
}

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11 changes: 11 additions & 0 deletions smartcropperlib/src/main/java/me/pqpo/smartcropperlib/SmartCropper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,11 @@

public class SmartCropper {

/**
* 输入图片扫描边框顶点
* @param srcBmp 扫描图片
* @return 返回顶点数组，以 左上，右上，右下，左下排序
*/
public static Point[] scan(Bitmap srcBmp) {
if (srcBmp == null) {
throw new IllegalArgumentException("srcBmp cannot be null");
Expand All @@ -22,6 +27,12 @@ public static Point[] scan(Bitmap srcBmp) {
return outPoints;
}

/**
* 裁剪图片
* @param srcBmp 待裁剪图片
* @param cropPoints 裁剪区域顶点，顶点坐标以图片大小为准
* @return 返回裁剪后的图片
*/
public static Bitmap crop(Bitmap srcBmp, Point[] cropPoints) {
if (srcBmp == null || cropPoints == null) {
throw new IllegalArgumentException("srcBmp and cropPoints cannot be null");
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111 changes: 93 additions & 18 deletions smartcropperlib/src/main/java/me/pqpo/smartcropperlib/view/CropImageView.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,11 +35,11 @@ public class CropImageView extends ImageView {

private static final String TAG = "CropImageView";

private static final float TOUCH_POINT_CATCH_DISTANCE = 15; //dp
private static final float POINT_RADIUS = 10; // dp
private static final float MAGNIFIER_CROSS_LINE_WIDTH = 0.8f; //dp
private static final float MAGNIFIER_CROSS_LINE_LENGTH = 3; //dp
private static final float MAGNIFIER_BORDER_WIDTH = 1; //dp
private static final float TOUCH_POINT_CATCH_DISTANCE = 15; //dp，触摸点捕捉到锚点的最小距离
private static final float POINT_RADIUS = 10; // dp，锚点绘制半价
private static final float MAGNIFIER_CROSS_LINE_WIDTH = 0.8f; //dp，放大镜十字宽度
private static final float MAGNIFIER_CROSS_LINE_LENGTH = 3; //dp， 放大镜十字长度
private static final float MAGNIFIER_BORDER_WIDTH = 1; //dp，放大镜边框宽度

private static final int DEFAULT_LINE_COLOR = 0xFF00FFFF;
private static final float DEFAULT_LINE_WIDTH = 1; //dp
Expand All @@ -57,8 +57,8 @@ public class CropImageView extends ImageView {
private Paint mGuideLinePaint;
private Paint mMagnifierPaint;
private Paint mMagnifierCrossPaint;
private float mScaleX, mScaleY;
private int mActWidth, mActHeight, mActLeft, mActTop;
private float mScaleX, mScaleY; // 显示的图片与实际图片缩放比
private int mActWidth, mActHeight, mActLeft, mActTop; //实际显示图片的位置
private Point mDraggingPoint = null;
private float mDensity;
private ShapeDrawable mMagnifierDrawable;
Expand All @@ -68,17 +68,17 @@ public class CropImageView extends ImageView {
private Path mPointLinePath = new Path();
private Matrix mMagnifierMatrix = new Matrix();

Point[] mCropPoints;
float mLineWidth;
float mGuideLineWidth;
int mPointFillColor = DEFAULT_POINT_FILL_COLOR;
int mPointFillAlpha = DEFAULT_POINT_FILL_ALPHA;
int mLineColor = DEFAULT_LINE_COLOR;
int mMagnifierCrossColor = DEFAULT_MAGNIFIER_CROSS_COLOR;
int mGuideLineColor = DEFAULT_GUIDE_LINE_COLOR;
int mMaskAlpha = DEFAULT_MASK_ALPHA; //0 - 255
boolean mShowGuideLine = true;
boolean mShowMagnifier = true;
Point[] mCropPoints; // 裁剪区域
float mLineWidth; // 选区线的宽度
float mGuideLineWidth; // 辅助线宽度
int mPointFillColor = DEFAULT_POINT_FILL_COLOR; // 锚点内部填充颜色
int mPointFillAlpha = DEFAULT_POINT_FILL_ALPHA; // 锚点填充颜色透明度
int mLineColor = DEFAULT_LINE_COLOR; // 选区线的颜色
int mMagnifierCrossColor = DEFAULT_MAGNIFIER_CROSS_COLOR; // 放大镜十字颜色
int mGuideLineColor = DEFAULT_GUIDE_LINE_COLOR; // 辅助线颜色
int mMaskAlpha = DEFAULT_MASK_ALPHA; //0 - 255, 蒙版透明度
boolean mShowGuideLine = true; // 是否显示辅助线
boolean mShowMagnifier = true;// 是否显示放大镜

public CropImageView(Context context) {
this(context, null);
Expand Down Expand Up @@ -114,6 +114,10 @@ private void initAttrs(Context context, AttributeSet attrs) {
ta.recycle();
}

/**
* 设置选区
* @param cropPoints 选区顶点
*/
public void setCropPoints(Point[] cropPoints) {
if (getDrawable() == null) {
Log.w(TAG, "should call after set drawable");
Expand All @@ -127,6 +131,9 @@ public void setCropPoints(Point[] cropPoints) {
}
}

/**
* 设置选区为包裹全图
*/
public void setFullImgCrop() {
if (getDrawable() == null) {
Log.w(TAG, "should call after set drawable");
Expand All @@ -142,64 +149,121 @@ public void setImageBitmap(Bitmap bm) {
mMagnifierDrawable = null;
}

/**
* 设置待裁剪图片并显示
* @param bmp
*/
public void setImageToCrop(Bitmap bmp) {
setImageBitmap(bmp);
setCropPoints(SmartCropper.scan(bmp));
}

/**
* 获取选区
* @return 选区顶点
*/
public Point[] getCropPoints() {
return mCropPoints;
}

/**
* 设置锚点填充颜色
* @param pointFillColor 颜色
*/
public void setPointFillColor(int pointFillColor) {
this.mPointFillColor = pointFillColor;
}

/**
* 设置锚点填充颜色透明度
* @param pointFillAlpha 透明度
*/
public void setPointFillAlpha(int pointFillAlpha) {
this.mPointFillAlpha = pointFillAlpha;
}

/**
* 蒙版透明度
* @param maskAlpha 透明度
*/
public void setMaskAlpha(int maskAlpha) {
maskAlpha = Math.min(Math.max(0, maskAlpha), 255);
this.mMaskAlpha = maskAlpha;
invalidate();
}

/**
* 是否显示辅助线
* @param showGuideLine 是否
*/
public void setShowGuideLine(boolean showGuideLine) {
this.mShowGuideLine = showGuideLine;
invalidate();
}

/**
* 设置辅助线颜色
* @param guideLineColor 颜色
*/
public void setGuideLineColor(int guideLineColor) {
this.mGuideLineColor = guideLineColor;
}

/**
* 设置辅助线宽度
* @param guideLineWidth 宽度 px
*/
public void setGuideLineWidth(float guideLineWidth) {
this.mGuideLineWidth = guideLineWidth;
}

/**
* 设置选区线的颜色
* @param lineColor 颜色
*/
public void setLineColor(int lineColor) {
this.mLineColor = lineColor;
invalidate();
}

/**
* 设置放大镜准心颜色
* @param magnifierCrossColor 准心颜色
*/
public void setMagnifierCrossColor(int magnifierCrossColor) {
this.mMagnifierCrossColor = magnifierCrossColor;
}

/**
* 设置选区线宽度
* @param lineWidth 线宽度，px
*/
public void setLineWidth(int lineWidth) {
this.mLineWidth = lineWidth;
invalidate();
}

/**
* 设置是否显示放大镜
* @param showMagnifier 是否
*/
public void setShowMagnifier(boolean showMagnifier) {
this.mShowMagnifier = showMagnifier;
}

/**
* 裁剪
* @return 裁剪后的图片
*/
public Bitmap crop() {
return crop(mCropPoints);
}

/**
* 使用自定义选区裁剪
* @param points 大小为4
* @return 裁剪后的图片
*/
public Bitmap crop(Point[] points) {
if (!checkPoints(points)) {
return null;
Expand All @@ -208,6 +272,10 @@ public Bitmap crop(Point[] points) {
return bmp == null ? null : SmartCropper.crop(bmp, points);
}

/**
* 选区是否为凸四边形
* @return true：凸四边形
*/
public boolean canRightCrop() {
if (!checkPoints(mCropPoints)) {
return false;
Expand Down Expand Up @@ -292,15 +360,22 @@ private void initMagnifier() {
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//初始化图片位置信息
getDrawablePosition();
//开始绘制选区
onDrawCropPoint(canvas);
}

protected void onDrawCropPoint(Canvas canvas) {
//绘制蒙版
onDrawMask(canvas);
//绘制辅助线
onDrawGuideLine(canvas);
//绘制选区线
onDrawLines(canvas);
//绘制锚点
onDrawPoints(canvas);
//绘制放大镜
onDrawMagnifier(canvas);
}

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