package com.codingbingo.fastreader.view.readview;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.Region;
import android.graphics.drawable.GradientDrawable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import com.codingbingo.fastreader.base.view.BaseReadView;
/**
* Author: bingo
* Email: codingbingo@gmail.com
* By 2017/1/15.
*/
public class PageWidget extends BaseReadView {
private int mCornerX = 1; // 拖拽点对应的页脚
private int mCornerY = 1;
private Path mPath0;
private Path mPath1;
PointF mBezierStart1 = new PointF(); // 贝塞尔曲线起始点
PointF mBezierControl1 = new PointF(); // 贝塞尔曲线控制点
PointF mBeziervertex1 = new PointF(); // 贝塞尔曲线顶点
PointF mBezierEnd1 = new PointF(); // 贝塞尔曲线结束点
PointF mBezierStart2 = new PointF(); // 另一条贝塞尔曲线
PointF mBezierControl2 = new PointF();
PointF mBeziervertex2 = new PointF();
PointF mBezierEnd2 = new PointF();
float mMiddleX;
float mMiddleY;
float mDegrees;
float mTouchToCornerDis;
ColorMatrixColorFilter mColorMatrixFilter;
Matrix mMatrix;
float[] mMatrixArray = {0, 0, 0, 0, 0, 0, 0, 0, 1.0f};
boolean mIsRTandLB; // 是否属于右上左下
private float mMaxLength;
int[] mBackShadowColors;// 背面颜色组
int[] mFrontShadowColors;// 前面颜色组
GradientDrawable mBackShadowDrawableLR; // 有阴影的GradientDrawable
GradientDrawable mBackShadowDrawableRL;
GradientDrawable mFolderShadowDrawableLR;
GradientDrawable mFolderShadowDrawableRL;
GradientDrawable mFrontShadowDrawableHBT;
GradientDrawable mFrontShadowDrawableHTB;
GradientDrawable mFrontShadowDrawableVLR;
GradientDrawable mFrontShadowDrawableVRL;
Paint mPaint;
public PageWidget(Context context){
this(context, null, 0);
}
public PageWidget(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public PageWidget(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mPath0 = new Path();
mPath1 = new Path();
mMaxLength = (float) Math.hypot(mScreenWidth, mScreenHeight);
mPaint = new Paint();
mPaint.setStyle(Paint.Style.FILL);
createDrawable();
ColorMatrix cm = new ColorMatrix();//设置颜色数组
float array[] = {0.55f, 0, 0, 0, 80.0f, 0, 0.55f, 0, 0, 80.0f, 0, 0, 0.55f, 0, 80.0f, 0, 0, 0, 0.2f, 0};
cm.set(array);
mColorMatrixFilter = new ColorMatrixColorFilter(cm);
mMatrix = new Matrix();
mTouch.x = 0.01f; // 不让x,y为0,否则在点计算时会有问题
mTouch.y = 0.01f;
}
/**
* 计算拖拽点对应的拖拽脚
*
* @param x 触摸点x坐标
* @param y 触摸点y坐标
*/
@Override
public void calcCornerXY(float x, float y) {
if (x <= mScreenWidth / 2)
mCornerX = 0;
else
mCornerX = mScreenWidth;
if (y <= mScreenHeight / 2)
mCornerY = 0;
else
mCornerY = mScreenHeight;
mIsRTandLB = (mCornerX == 0 && mCornerY == mScreenHeight)
|| (mCornerX == mScreenWidth && mCornerY == 0);
}
/**
* 求解直线P1P2和直线P3P4的交点坐标
*/
public PointF getCross(PointF P1, PointF P2, PointF P3, PointF P4) {
PointF CrossP = new PointF();
float a1 = (P2.y - P1.y) / (P2.x - P1.x);
float b1 = ((P1.x * P2.y) - (P2.x * P1.y)) / (P1.x - P2.x);
float a2 = (P4.y - P3.y) / (P4.x - P3.x);
float b2 = ((P3.x * P4.y) - (P4.x * P3.y)) / (P3.x - P4.x);
CrossP.x = (b2 - b1) / (a1 - a2);
CrossP.y = a1 * CrossP.x + b1;
return CrossP;
}
@Override
protected void calcPoints() {
mMiddleX = (mTouch.x + mCornerX) / 2;
mMiddleY = (mTouch.y + mCornerY) / 2;
mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY) * (mCornerY - mMiddleY) / (mCornerX - mMiddleX);
mBezierControl1.y = mCornerY;
mBezierControl2.x = mCornerX;
//mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
float f4 = mCornerY - mMiddleY;
if (f4 == 0) {
mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / 0.1f;
} else {
mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
}
mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x) / 2;
mBezierStart1.y = mCornerY;
// 当mBezierStart1.x < 0或者mBezierStart1.x > 480时
// 如果继续翻页，会出现BUG故在此限制
if (mTouch.x > 0 && mTouch.x < mScreenWidth) {
if (mBezierStart1.x < 0 || mBezierStart1.x > mScreenWidth) {
if (mBezierStart1.x < 0)
mBezierStart1.x = mScreenWidth - mBezierStart1.x;
float f1 = Math.abs(mCornerX - mTouch.x);
float f2 = mScreenWidth * f1 / mBezierStart1.x;
mTouch.x = Math.abs(mCornerX - f2);
float f3 = Math.abs(mCornerX - mTouch.x)
* Math.abs(mCornerY - mTouch.y) / f1;
mTouch.y = Math.abs(mCornerY - f3);
mMiddleX = (mTouch.x + mCornerX) / 2;
mMiddleY = (mTouch.y + mCornerY) / 2;
mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY) * (mCornerY - mMiddleY) / (mCornerX - mMiddleX);
mBezierControl1.y = mCornerY;
mBezierControl2.x = mCornerX;
//mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
float f5 = mCornerY - mMiddleY;
if (f5 == 0) {
mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / 0.1f;
} else {
mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY);
}
mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x) / 2;
}
}
mBezierStart2.x = mCornerX;
mBezierStart2.y = mBezierControl2.y - (mCornerY - mBezierControl2.y) / 2;
mTouchToCornerDis = (float) Math.hypot((mTouch.x - mCornerX), (mTouch.y - mCornerY));
mBezierEnd1 = getCross(mTouch, mBezierControl1, mBezierStart1, mBezierStart2);
mBezierEnd2 = getCross(mTouch, mBezierControl2, mBezierStart1, mBezierStart2);
/*
* mBeziervertex1.x 推导
* ((mBezierStart1.x+mBezierEnd1.x)/2+mBezierControl1.x)/2 化简等价于
* (mBezierStart1.x+ 2*mBezierControl1.x+mBezierEnd1.x) / 4
*/
mBeziervertex1.x = (mBezierStart1.x + 2 * mBezierControl1.x + mBezierEnd1.x) / 4;
mBeziervertex1.y = (2 * mBezierControl1.y + mBezierStart1.y + mBezierEnd1.y) / 4;
mBeziervertex2.x = (mBezierStart2.x + 2 * mBezierControl2.x + mBezierEnd2.x) / 4;
mBeziervertex2.y = (2 * mBezierControl2.y + mBezierStart2.y + mBezierEnd2.y) / 4;
}
@Override
protected void drawCurrentPageArea(Canvas canvas) {
mPath0.reset();
mPath0.moveTo(mBezierStart1.x, mBezierStart1.y);
mPath0.quadTo(mBezierControl1.x, mBezierControl1.y, mBezierEnd1.x, mBezierEnd1.y);
mPath0.lineTo(mTouch.x, mTouch.y);
mPath0.lineTo(mBezierEnd2.x, mBezierEnd2.y);
mPath0.quadTo(mBezierControl2.x, mBezierControl2.y, mBezierStart2.x, mBezierStart2.y);
mPath0.lineTo(mCornerX, mCornerY);
mPath0.close();
canvas.save();
canvas.clipPath(mPath0, Region.Op.XOR);
canvas.drawBitmap(mCurPageBitmap, 0, 0, null);
try {
canvas.restore();
} catch (Exception e) {
}
}
@Override
protected void drawNextPageAreaAndShadow(Canvas canvas) {
mPath1.reset();
mPath1.moveTo(mBezierStart1.x, mBezierStart1.y);
mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y);
mPath1.lineTo(mBeziervertex2.x, mBeziervertex2.y);
mPath1.lineTo(mBezierStart2.x, mBezierStart2.y);
mPath1.lineTo(mCornerX, mCornerY);
mPath1.close();
mDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl1.x - mCornerX, mBezierControl2.y - mCornerY));
int leftx;
int rightx;
GradientDrawable mBackShadowDrawable;
if (mIsRTandLB) { //左下及右上
leftx = (int) (mBezierStart1.x);
rightx = (int) (mBezierStart1.x + mTouchToCornerDis / 4);
mBackShadowDrawable = mBackShadowDrawableLR;
} else {
leftx = (int) (mBezierStart1.x - mTouchToCornerDis / 4);
rightx = (int) mBezierStart1.x;
mBackShadowDrawable = mBackShadowDrawableRL;
}
canvas.save();
try {
canvas.clipPath(mPath0);
canvas.clipPath(mPath1, Region.Op.INTERSECT);
} catch (Exception e) {
}
canvas.drawBitmap(mNextPageBitmap, 0, 0, null);
canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y);
mBackShadowDrawable.setBounds(leftx, (int) mBezierStart1.y,
rightx, (int) (mMaxLength + mBezierStart1.y));//左上及右下角的xy坐标值,构成一个矩形
mBackShadowDrawable.draw(canvas);
canvas.restore();
}
public void setBitmaps(Bitmap currentPageBitmap, Bitmap nextPageBitmap) {
mCurPageBitmap = currentPageBitmap;
mNextPageBitmap = nextPageBitmap;
}
/**
* 创建阴影的GradientDrawable
*/
private void createDrawable() {
int[] color = {0x333333, 0xb0333333};
mFolderShadowDrawableRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, color);
mFolderShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mFolderShadowDrawableLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, color);
mFolderShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mBackShadowColors = new int[]{0xff111111, 0x111111};
mBackShadowDrawableRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, mBackShadowColors);
mBackShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mBackShadowDrawableLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, mBackShadowColors);
mBackShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mFrontShadowColors = new int[]{0x80111111, 0x111111};
mFrontShadowDrawableVLR = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, mFrontShadowColors);
mFrontShadowDrawableVLR.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mFrontShadowDrawableVRL = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, mFrontShadowColors);
mFrontShadowDrawableVRL.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mFrontShadowDrawableHTB = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, mFrontShadowColors);
mFrontShadowDrawableHTB.setGradientType(GradientDrawable.LINEAR_GRADIENT);
mFrontShadowDrawableHBT = new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, mFrontShadowColors);
mFrontShadowDrawableHBT.setGradientType(GradientDrawable.LINEAR_GRADIENT);
}
/**
* 绘制翻起页的阴影
*
* @param canvas
*/
public void drawCurrentPageShadow(Canvas canvas) {
double degree;
if (mIsRTandLB) {
degree = Math.PI / 4 - Math.atan2(mBezierControl1.y - mTouch.y, mTouch.x - mBezierControl1.x);
} else {
degree = Math.PI / 4 - Math.atan2(mTouch.y - mBezierControl1.y, mTouch.x - mBezierControl1.x);
}
// 翻起页阴影顶点与touch点的距离
double d1 = (float) 25 * 1.414 * Math.cos(degree);
double d2 = (float) 25 * 1.414 * Math.sin(degree);
float x = (float) (mTouch.x + d1);
float y;
if (mIsRTandLB) {
y = (float) (mTouch.y + d2);
} else {
y = (float) (mTouch.y - d2);
}
mPath1.reset();
mPath1.moveTo(x, y);
mPath1.lineTo(mTouch.x, mTouch.y);
mPath1.lineTo(mBezierControl1.x, mBezierControl1.y);
mPath1.lineTo(mBezierStart1.x, mBezierStart1.y);
mPath1.close();
float rotateDegrees;
canvas.save();
try {
canvas.clipPath(mPath0, Region.Op.XOR);
canvas.clipPath(mPath1, Region.Op.INTERSECT);
} catch (Exception e) {
}
int leftx;
int rightx;
GradientDrawable mCurrentPageShadow;
if (mIsRTandLB) {
leftx = (int) (mBezierControl1.x);
rightx = (int) mBezierControl1.x + 25;
mCurrentPageShadow = mFrontShadowDrawableVLR;
} else {
leftx = (int) (mBezierControl1.x - 25);
rightx = (int) mBezierControl1.x + 1;
mCurrentPageShadow = mFrontShadowDrawableVRL;
}
rotateDegrees = (float) Math.toDegrees(Math.atan2(mTouch.x - mBezierControl1.x,
mBezierControl1.y - mTouch.y));
canvas.rotate(rotateDegrees, mBezierControl1.x, mBezierControl1.y);
mCurrentPageShadow.setBounds(leftx, (int) (mBezierControl1.y - mMaxLength),
rightx, (int) (mBezierControl1.y));
mCurrentPageShadow.draw(canvas);
canvas.restore();
mPath1.reset();
mPath1.moveTo(x, y);
mPath1.lineTo(mTouch.x, mTouch.y);
mPath1.lineTo(mBezierControl2.x, mBezierControl2.y);
mPath1.lineTo(mBezierStart2.x, mBezierStart2.y);
mPath1.close();
canvas.save();
try {
canvas.clipPath(mPath0, Region.Op.XOR);
canvas.clipPath(mPath1, Region.Op.INTERSECT);
} catch (Exception e) {
}
if (mIsRTandLB) {
leftx = (int) (mBezierControl2.y);
rightx = (int) (mBezierControl2.y + 25);
mCurrentPageShadow = mFrontShadowDrawableHTB;
} else {
leftx = (int) (mBezierControl2.y - 25);
rightx = (int) (mBezierControl2.y + 1);
mCurrentPageShadow = mFrontShadowDrawableHBT;
}
rotateDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl2.y - mTouch.y, mBezierControl2.x - mTouch.x));
canvas.rotate(rotateDegrees, mBezierControl2.x, mBezierControl2.y);
float temp;
if (mBezierControl2.y < 0)
temp = mBezierControl2.y - mScreenHeight;
else
temp = mBezierControl2.y;
int hmg = (int) Math.hypot(mBezierControl2.x, temp);
if (hmg > mMaxLength) {
mCurrentPageShadow.setBounds((int) (mBezierControl2.x - 25) - hmg, leftx,
(int) (mBezierControl2.x + mMaxLength) - hmg, rightx);
} else {
mCurrentPageShadow.setBounds((int) (mBezierControl2.x - mMaxLength), leftx,
(int) (mBezierControl2.x), rightx);
}
mCurrentPageShadow.draw(canvas);
canvas.restore();
}
@Override
protected void drawCurrentBackArea(Canvas canvas) {
int i = (int) (mBezierStart1.x + mBezierControl1.x) / 2;
float f1 = Math.abs(i - mBezierControl1.x);
int i1 = (int) (mBezierStart2.y + mBezierControl2.y) / 2;
float f2 = Math.abs(i1 - mBezierControl2.y);
float f3 = Math.min(f1, f2);
mPath1.reset();
mPath1.moveTo(mBeziervertex2.x, mBeziervertex2.y);
mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y);
mPath1.lineTo(mBezierEnd1.x, mBezierEnd1.y);
mPath1.lineTo(mTouch.x, mTouch.y);
mPath1.lineTo(mBezierEnd2.x, mBezierEnd2.y);
mPath1.close();
GradientDrawable mFolderShadowDrawable;
int left;
int right;
if (mIsRTandLB) {
left = (int) (mBezierStart1.x - 1);
right = (int) (mBezierStart1.x + f3 + 1);
mFolderShadowDrawable = mFolderShadowDrawableLR;
} else {
left = (int) (mBezierStart1.x - f3 - 1);
right = (int) (mBezierStart1.x + 1);
mFolderShadowDrawable = mFolderShadowDrawableRL;
}
canvas.save();
try {
canvas.clipPath(mPath0);
canvas.clipPath(mPath1, Region.Op.INTERSECT);
} catch (Exception e) {
}
mPaint.setColorFilter(mColorMatrixFilter);
float dis = (float) Math.hypot(mCornerX - mBezierControl1.x,
mBezierControl2.y - mCornerY);
float f8 = (mCornerX - mBezierControl1.x) / dis;
float f9 = (mBezierControl2.y - mCornerY) / dis;
mMatrixArray[0] = 1 - 2 * f9 * f9;
mMatrixArray[1] = 2 * f8 * f9;
mMatrixArray[3] = mMatrixArray[1];
mMatrixArray[4] = 1 - 2 * f8 * f8;
mMatrix.reset();
mMatrix.setValues(mMatrixArray);
mMatrix.preTranslate(-mBezierControl1.x, -mBezierControl1.y);
mMatrix.postTranslate(mBezierControl1.x, mBezierControl1.y);
canvas.drawBitmap(mCurPageBitmap, mMatrix, mPaint);
// canvas.drawBitmap(bitmap, mMatrix, null);
mPaint.setColorFilter(null);
canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y);
mFolderShadowDrawable.setBounds(left, (int) mBezierStart1.y, right,
(int) (mBezierStart1.y + mMaxLength));
mFolderShadowDrawable.draw(canvas);
canvas.restore();
}
@Override
public void computeScroll() {
super.computeScroll();
if (mScroller.computeScrollOffset()) {
float x = mScroller.getCurrX();
float y = mScroller.getCurrY();
mTouch.x = x;
mTouch.y = y;
postInvalidate();
}
}
}