package com.anlia.pageturn.view;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Region;
import android.graphics.drawable.GradientDrawable;
import android.os.Trace;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.LinearInterpolator;
import android.widget.Scroller;
import com.anlia.pageturn.R;
import com.anlia.pageturn.bean.MyPoint;
/**
* Created by anlia on 2017/10/19.
*/
public class BookPageView extends View {
private Paint pointPaint;//绘制各标识点的画笔
private Paint bgPaint;//背景画笔
private Paint pathAPaint;//绘制A区域画笔
private Paint pathBPaint;//绘制B区域画笔
private Paint pathCPaint;//绘制C区域画笔
private Paint textPaint;//绘制文字画笔
private Paint pathCContentPaint;//绘制C区域内容画笔
private MyPoint a,f,g,e,h,c,j,b,k,d,i;
private Path pathA;
private Path pathB;
private Path pathC;
private int defaultWidth;//默认宽度
private int defaultHeight;//默认高度
private int viewWidth;
private int viewHeight;
float lPathAShadowDis = 0;//A区域左阴影矩形短边长度参考值
float rPathAShadowDis = 0;//A区域右阴影矩形短边长度参考值
private float[] mMatrixArray = { 0, 0, 0, 0, 0, 0, 0, 0, 1.0f };
private Matrix mMatrix;
private Scroller mScroller;
private String style;
public static final String STYLE_LEFT = "STYLE_LEFT";//点击左边区域
public static final String STYLE_RIGHT = "STYLE_RIGHT";//点击右边区域
public static final String STYLE_MIDDLE = "STYLE_MIDDLE";//点击中间区域
public static final String STYLE_TOP_RIGHT = "STYLE_TOP_RIGHT";//f点在右上角
public static final String STYLE_LOWER_RIGHT = "STYLE_LOWER_RIGHT";//f点在右下角
private GradientDrawable drawableLeftTopRight;
private GradientDrawable drawableLeftLowerRight;
private GradientDrawable drawableRightTopRight;
private GradientDrawable drawableRightLowerRight;
private GradientDrawable drawableHorizontalLowerRight;
private GradientDrawable drawableBTopRight;
private GradientDrawable drawableBLowerRight;
private GradientDrawable drawableCTopRight;
private GradientDrawable drawableCLowerRight;
private Bitmap pathAContentBitmap;//A区域内容Bitmap
private Bitmap pathBContentBitmap;//B区域内容Bitmap
private Bitmap pathCContentBitmap;//C区域内容Bitmap
public BookPageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(context,attrs);
}
private void init(Context context, @Nullable AttributeSet attrs){
defaultWidth = 600;
defaultHeight = 1000;
a = new MyPoint();
f = new MyPoint();
g = new MyPoint();
e = new MyPoint();
h = new MyPoint();
c = new MyPoint();
j = new MyPoint();
b = new MyPoint();
k = new MyPoint();
d = new MyPoint();
i = new MyPoint();
pointPaint = new Paint();
pointPaint.setColor(Color.RED);
pointPaint.setTextSize(25);
pointPaint.setStyle(Paint.Style.STROKE);
bgPaint = new Paint();
bgPaint.setColor(Color.GREEN);
pathAPaint = new Paint();
pathAPaint.setColor(Color.GREEN);
pathAPaint.setAntiAlias(true);//设置抗锯齿
pathBPaint = new Paint();
pathBPaint.setColor(getResources().getColor(R.color.blue_light));
pathBPaint.setAntiAlias(true);//设置抗锯齿
// pathBPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP));我们不需要单独绘制path了，记得注释掉
pathCPaint = new Paint();
pathCPaint.setColor(Color.YELLOW);
pathCPaint.setAntiAlias(true);//设置抗锯齿
// pathCPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP));
// pathCPaint.setStyle(Paint.Style.STROKE);
pathCContentPaint = new Paint();
pathCContentPaint.setColor(Color.YELLOW);
pathCContentPaint.setAntiAlias(true);//设置抗锯齿
textPaint = new Paint();
textPaint.setColor(Color.BLACK);
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.setSubpixelText(true);//设置自像素。如果该项为true，将有助于文本在LCD屏幕上的显示效果。
textPaint.setTextSize(30);
pathA = new Path();
pathB = new Path();
pathC = new Path();
style = STYLE_LOWER_RIGHT;
mScroller = new Scroller(context,new LinearInterpolator());
mMatrix = new Matrix();
createGradientDrawable();
}
private void drawPathAContentBitmap(Bitmap bitmap,Paint pathPaint){
Canvas mCanvas = new Canvas(bitmap);
//下面开始绘制区域内的内容...
mCanvas.drawPath(getPathDefault(),pathPaint);
mCanvas.drawText("这是在A区域的内容...AAAA", viewWidth-260, viewHeight-100, textPaint);
//结束绘制区域内的内容...
}
private void drawPathBContentBitmap(Bitmap bitmap,Paint pathPaint){
Canvas mCanvas = new Canvas(bitmap);
//下面开始绘制区域内的内容...
mCanvas.drawPath(getPathDefault(),pathPaint);
mCanvas.drawText("这是在B区域的内容...BBBB", viewWidth-260, viewHeight-100, textPaint);
//结束绘制区域内的内容...
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = measureSize(defaultHeight, heightMeasureSpec);
int width = measureSize(defaultWidth, widthMeasureSpec);
setMeasuredDimension(width, height);
viewWidth = width;
viewHeight = height;
a.x = -1;
a.y = -1;
pathAContentBitmap = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.RGB_565);
drawPathAContentBitmap(pathAContentBitmap,pathAPaint);
pathBContentBitmap = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.RGB_565);
drawPathBContentBitmap(pathBContentBitmap,pathBPaint);
pathCContentBitmap = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.RGB_565);
drawPathAContentBitmap(pathCContentBitmap,pathCPaint);
}
private int measureSize(int defaultSize,int measureSpec) {
int result = defaultSize;
int specMode = View.MeasureSpec.getMode(measureSpec);
int specSize = View.MeasureSpec.getSize(measureSpec);
if (specMode == View.MeasureSpec.EXACTLY) {
result = specSize;
} else if (specMode == View.MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
return result;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.YELLOW);
if(a.x==-1 && a.y==-1){
drawPathAContent(canvas,getPathDefault());
}else {
if(f.x==viewWidth && f.y==0){
drawPathAContent(canvas,getPathAFromTopRight());
drawPathCContent(canvas,getPathAFromTopRight());
drawPathBContent(canvas,getPathAFromTopRight());
}else if(f.x==viewWidth && f.y==viewHeight){
beginTrace("drawPathA");
drawPathAContent(canvas,getPathAFromLowerRight());
endTrace();
beginTrace("drawPathC");
drawPathCContent(canvas,getPathAFromLowerRight());
endTrace();
beginTrace("drawPathB");
drawPathBContent(canvas,getPathAFromLowerRight());
endTrace();
}
}
//绘制各标识点
/*canvas.drawText("a",a.x,a.y,pointPaint);
canvas.drawText("f",f.x,f.y,pointPaint);
canvas.drawText("g",g.x,g.y,pointPaint);
canvas.drawText("e",e.x,e.y,pointPaint);
canvas.drawText("h",h.x,h.y,pointPaint);
canvas.drawText("c",c.x,c.y,pointPaint);
canvas.drawText("j",j.x,j.y,pointPaint);
canvas.drawText("b",b.x,b.y,pointPaint);
canvas.drawText("k",k.x,k.y,pointPaint);
canvas.drawText("d",d.x,d.y,pointPaint);
canvas.drawText("i",i.x,i.y,pointPaint);*/
}
@TargetApi(18)
private void beginTrace(String tag){
Trace.beginSection(tag);
}
@TargetApi(18)
private void endTrace(){
Trace.endSection();
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
float x = mScroller.getCurrX();
float y = mScroller.getCurrY();
if(style.equals(STYLE_TOP_RIGHT)){
setTouchPoint(x,y,STYLE_TOP_RIGHT);
}else {
setTouchPoint(x,y,STYLE_LOWER_RIGHT);
}
if (mScroller.getFinalX() == x && mScroller.getFinalY() == y){
setDefaultPath();
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
float x = event.getX();
float y = event.getY();
if(x<=viewWidth/3){//左
style = STYLE_LEFT;
setTouchPoint(x,y,style);
}else if(x>viewWidth/3 && y<=viewHeight/3){//上
style = STYLE_TOP_RIGHT;
setTouchPoint(x,y,style);
}else if(x>viewWidth*2/3 && y>viewHeight/3 && y<=viewHeight*2/3){//右
style = STYLE_RIGHT;
setTouchPoint(x,y,style);
}else if(x>viewWidth/3 && y>viewHeight*2/3){//下
style = STYLE_LOWER_RIGHT;
setTouchPoint(x,y,style);
}else if(x>viewWidth/3 && x<viewWidth*2/3 && y>viewHeight/3 && y<viewHeight*2/3){//中
style = STYLE_MIDDLE;
}
break;
case MotionEvent.ACTION_MOVE:
setTouchPoint(event.getX(),event.getY(),style);
break;
case MotionEvent.ACTION_UP:
startCancelAnim();
break;
}
return true;
}
/**
* 取消翻页动画,计算滑动位置与时间
*/
public void startCancelAnim(){
int dx,dy;
//让a滑动到f点所在位置，留出1像素是为了防止当a和f重叠时出现View闪烁的情况
if(style.equals(STYLE_TOP_RIGHT)){
dx = (int) (viewWidth-1-a.x);
dy = (int) (1-a.y);
}else {
dx = (int) (viewWidth-1-a.x);
dy = (int) (viewHeight-1-a.y);
}
mScroller.startScroll((int) a.x, (int) a.y, dx, dy, 400);
}
/**
* 设置触摸点
* @param x
* @param y
* @param style
*/
public void setTouchPoint(float x, float y, String style){
MyPoint touchPoint = new MyPoint();
a.x = x;
a.y = y;
this.style = style;
switch (style){
case STYLE_TOP_RIGHT:
f.x = viewWidth;
f.y = 0;
calcPointsXY(a,f);
touchPoint = new MyPoint(x,y);
if(calcPointCX(touchPoint,f)<0){//如果c点x坐标小于0则重新测量a点坐标
calcPointAByTouchPoint();
calcPointsXY(a,f);
}
postInvalidate();
break;
case STYLE_LEFT:
case STYLE_RIGHT:
a.y = viewHeight-1;
f.x = viewWidth;
f.y = viewHeight;
calcPointsXY(a,f);
postInvalidate();
break;
case STYLE_LOWER_RIGHT:
f.x = viewWidth;
f.y = viewHeight;
calcPointsXY(a,f);
touchPoint = new MyPoint(x,y);
if(calcPointCX(touchPoint,f)<0){//如果c点x坐标小于0则重新测量a点坐标
calcPointAByTouchPoint();
calcPointsXY(a,f);
}
postInvalidate();
break;
default:
break;
}
}
/**
* 如果c点x坐标小于0,根据触摸点重新测量a点坐标
*/
private void calcPointAByTouchPoint(){
float w0 = viewWidth - c.x;
float w1 = Math.abs(f.x - a.x);
float w2 = viewWidth * w1 / w0;
a.x = Math.abs(f.x - w2);
float h1 = Math.abs(f.y - a.y);
float h2 = w2 * h1 / w1;
a.y = Math.abs(f.y - h2);
}
/**
* 回到默认状态
*/
public void setDefaultPath(){
a.x = -1;
a.y = -1;
postInvalidate();
}
/**
* 初始化各区域阴影GradientDrawable
*/
private void createGradientDrawable(){
int deepColor = 0x33333333;
int lightColor = 0x01333333;
int[] gradientColors = new int[]{lightColor,deepColor};//渐变颜色数组
drawableLeftTopRight = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, gradientColors);
drawableLeftTopRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
drawableLeftLowerRight = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, gradientColors);
drawableLeftLowerRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
deepColor = 0x22333333;
lightColor = 0x01333333;
gradientColors = new int[]{deepColor,lightColor,lightColor};
drawableRightTopRight = new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, gradientColors);
drawableRightTopRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
drawableRightLowerRight = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, gradientColors);
drawableRightLowerRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
deepColor = 0x44333333;
lightColor = 0x01333333;
gradientColors = new int[]{lightColor,deepColor};//渐变颜色数组
drawableHorizontalLowerRight = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, gradientColors);;
drawableHorizontalLowerRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
deepColor = 0x55111111;
lightColor = 0x00111111;
gradientColors = new int[] {deepColor,lightColor};//渐变颜色数组
drawableBTopRight =new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,gradientColors);
drawableBTopRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);//线性渐变
drawableBLowerRight =new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT,gradientColors);
drawableBLowerRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
deepColor = 0x55333333;
lightColor = 0x00333333;
gradientColors = new int[]{lightColor,deepColor};//渐变颜色数组
drawableCTopRight = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, gradientColors);
drawableCTopRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
drawableCLowerRight = new GradientDrawable(GradientDrawable.Orientation.RIGHT_LEFT, gradientColors);
drawableCLowerRight.setGradientType(GradientDrawable.LINEAR_GRADIENT);
}
/**
* 绘制A区域内容
* @param canvas
* @param pathA
*/
private void drawPathAContent(Canvas canvas, Path pathA){
canvas.save();
canvas.clipPath(pathA, Region.Op.INTERSECT);//对绘制内容进行裁剪，取和A区域的交集
canvas.drawBitmap(pathAContentBitmap, 0, 0, null);
if(style.equals(STYLE_LEFT) || style.equals(STYLE_RIGHT)){
drawPathAHorizontalShadow(canvas,pathA);
}else {
drawPathALeftShadow(canvas,pathA);
drawPathARightShadow(canvas,pathA);
}
canvas.restore();
}
/**
* 绘制A区域左阴影
* @param canvas
*/
private void drawPathALeftShadow(Canvas canvas, Path pathA){
canvas.restore();
canvas.save();
int left;
int right;
int top = (int) e.y;
int bottom = (int) (e.y+viewHeight);
GradientDrawable gradientDrawable;
if (style.equals(STYLE_TOP_RIGHT)) {
gradientDrawable = drawableLeftTopRight;
left = (int) (e.x - lPathAShadowDis /2);
right = (int) (e.x);
} else {
gradientDrawable = drawableLeftLowerRight;
left = (int) (e.x);
right = (int) (e.x + lPathAShadowDis /2);
}
Path mPath = new Path();
mPath.moveTo(a.x- Math.max(rPathAShadowDis, lPathAShadowDis) /2,a.y);
mPath.lineTo(d.x,d.y);
mPath.lineTo(e.x,e.y);
mPath.lineTo(a.x,a.y);
mPath.close();
canvas.clipPath(pathA);
canvas.clipPath(mPath, Region.Op.INTERSECT);
float mDegrees = (float) Math.toDegrees(Math.atan2(e.x-a.x, a.y-e.y));
canvas.rotate(mDegrees, e.x, e.y);
gradientDrawable.setBounds(left,top,right,bottom);
gradientDrawable.draw(canvas);
}
/**
* 绘制A区域右阴影
* @param canvas
*/
private void drawPathARightShadow(Canvas canvas, Path pathA){
canvas.restore();
canvas.save();
float viewDiagonalLength = (float) Math.hypot(viewWidth, viewHeight);//view对角线长度
int left = (int) h.x;
int right = (int) (h.x + viewDiagonalLength*10);//需要足够长的长度
int top;
int bottom;
GradientDrawable gradientDrawable;
if (style.equals(STYLE_TOP_RIGHT)) {
gradientDrawable = drawableRightTopRight;
top = (int) (h.y- rPathAShadowDis /2);
bottom = (int) h.y;
} else {
gradientDrawable = drawableRightLowerRight;
top = (int) h.y;
bottom = (int) (h.y+ rPathAShadowDis /2);
}
gradientDrawable.setBounds(left,top,right,bottom);
Path mPath = new Path();
mPath.moveTo(a.x- Math.max(rPathAShadowDis, lPathAShadowDis) /2,a.y);
// mPath.lineTo(i.x,i.y);
mPath.lineTo(h.x,h.y);
mPath.lineTo(a.x,a.y);
mPath.close();
canvas.clipPath(pathA);
canvas.clipPath(mPath, Region.Op.INTERSECT);
float mDegrees = (float) Math.toDegrees(Math.atan2(a.y-h.y, a.x-h.x));
canvas.rotate(mDegrees, h.x, h.y);
gradientDrawable.draw(canvas);
}
/**
* 绘制A区域水平翻页阴影
* @param canvas
*/
private void drawPathAHorizontalShadow(Canvas canvas, Path pathA){
canvas.restore();
canvas.save();
canvas.clipPath(pathA, Region.Op.INTERSECT);
int maxShadowWidth = 30;//阴影矩形最大的宽度
int left = (int) (a.x - Math.min(maxShadowWidth,(rPathAShadowDis/2)));
int right = (int) (a.x);
int top = 0;
int bottom = viewHeight;
GradientDrawable gradientDrawable = drawableHorizontalLowerRight;
gradientDrawable.setBounds(left,top,right,bottom);
float mDegrees = (float) Math.toDegrees(Math.atan2(f.x-a.x,f.y-h.y));
canvas.rotate(mDegrees, a.x, a.y);
gradientDrawable.draw(canvas);
}
/**
* 绘制默认的界面
* @return
*/
private Path getPathDefault(){
pathA.reset();
pathA.lineTo(0, viewHeight);
pathA.lineTo(viewWidth,viewHeight);
pathA.lineTo(viewWidth,0);
pathA.close();
return pathA;
}
/**
* 获取f点在右上角的pathA
* @return
*/
private Path getPathAFromTopRight(){
pathA.reset();
pathA.lineTo(c.x,c.y);//移动到c点
pathA.quadTo(e.x,e.y,b.x,b.y);//从c到b画贝塞尔曲线，控制点为e
pathA.lineTo(a.x,a.y);//移动到a点
pathA.lineTo(k.x,k.y);//移动到k点
pathA.quadTo(h.x,h.y,j.x,j.y);//从k到j画贝塞尔曲线，控制点为h
pathA.lineTo(viewWidth,viewHeight);//移动到右下角
pathA.lineTo(0, viewHeight);//移动到左下角
pathA.close();
return pathA;
}
/**
* 获取f点在右下角的pathA
* @return
*/
private Path getPathAFromLowerRight(){
pathA.reset();
pathA.lineTo(0, viewHeight);//移动到左下角
pathA.lineTo(c.x,c.y);//移动到c点
pathA.quadTo(e.x,e.y,b.x,b.y);//从c到b画贝塞尔曲线，控制点为e
pathA.lineTo(a.x,a.y);//移动到a点
pathA.lineTo(k.x,k.y);//移动到k点
pathA.quadTo(h.x,h.y,j.x,j.y);//从k到j画贝塞尔曲线，控制点为h
pathA.lineTo(viewWidth,0);//移动到右上角
pathA.close();//闭合区域
return pathA;
}
/**
* 绘制B区域内容
* @param canvas
* @param pathA
*/
private void drawPathBContent(Canvas canvas, Path pathA){
canvas.save();
canvas.clipPath(pathA);//裁剪出A区域
canvas.clipPath(getPathC(),Region.Op.UNION);//裁剪出A和C区域的全集
canvas.clipPath(getPathB(), Region.Op.REVERSE_DIFFERENCE);//裁剪出B区域中不同于与AC区域的部分
canvas.drawBitmap(pathBContentBitmap, 0, 0, null);
drawPathBShadow(canvas);
canvas.restore();
}
/**
* 绘制B区域阴影，阴影左深右浅
* @param canvas
*/
private void drawPathBShadow(Canvas canvas){
int deepOffset = 0;//深色端的偏移值
int lightOffset = 0;//浅色端的偏移值
float aTof =(float) Math.hypot((a.x - f.x),(a.y - f.y));//a到f的距离
float viewDiagonalLength = (float) Math.hypot(viewWidth, viewHeight);//对角线长度
int left;
int right;
int top = (int) c.y;
int bottom = (int) (viewDiagonalLength + c.y);
GradientDrawable gradientDrawable;
if(style.equals(STYLE_TOP_RIGHT)){//f点在右上角
//从左向右线性渐变
gradientDrawable = drawableBTopRight;
left = (int) (c.x - deepOffset);//c点位于左上角
right = (int) (c.x + aTof/4 + lightOffset);
}else {
//从右向左线性渐变
gradientDrawable = drawableBLowerRight;
left = (int) (c.x - aTof/4 - lightOffset);//c点位于左下角
right = (int) (c.x + deepOffset);
}
gradientDrawable.setBounds(left,top,right,bottom);//设置阴影矩形
float rotateDegrees = (float) Math.toDegrees(Math.atan2(e.x- f.x, h.y - f.y));//旋转角度
canvas.rotate(rotateDegrees, c.x, c.y);//以c为中心点旋转
gradientDrawable.draw(canvas);
}
/**
* 绘制区域B
* @return
*/
private Path getPathB(){
pathB.reset();
pathB.lineTo(0, viewHeight);//移动到左下角
pathB.lineTo(viewWidth,viewHeight);//移动到右下角
pathB.lineTo(viewWidth,0);//移动到右上角
pathB.close();//闭合区域
return pathB;
}
/**
* 绘制C区域内容
* @param canvas
* @param pathA
*/
private void drawPathCContent(Canvas canvas, Path pathA){
canvas.save();
canvas.clipPath(pathA);
canvas.clipPath(getPathC(), Region.Op.REVERSE_DIFFERENCE);//裁剪出C区域不同于A区域的部分
// canvas.drawPath(getPathC(),pathCPaint);
float eh = (float) Math.hypot(f.x - e.x,h.y - f.y);
float sin0 = (f.x - e.x) / eh;
float cos0 = (h.y - f.y) / eh;
//设置翻转和旋转矩阵
mMatrixArray[0] = -(1-2 * sin0 * sin0);
mMatrixArray[1] = 2 * sin0 * cos0;
mMatrixArray[3] = 2 * sin0 * cos0;
mMatrixArray[4] = 1 - 2 * sin0 * sin0;
mMatrix.reset();
mMatrix.setValues(mMatrixArray);//翻转和旋转
mMatrix.preTranslate(-e.x, -e.y);//沿当前XY轴负方向位移得到 矩形A₃B₃C₃D₃
mMatrix.postTranslate(e.x, e.y);//沿原XY轴方向位移得到 矩形A4 B4 C4 D4
canvas.drawBitmap(pathCContentBitmap, mMatrix, null);
drawPathCShadow(canvas);
canvas.restore();
}
/**
* 绘制C区域阴影，阴影左浅右深
* @param canvas
*/
private void drawPathCShadow(Canvas canvas){
int deepOffset = 1;//深色端的偏移值
int lightOffset = -30;//浅色端的偏移值
float viewDiagonalLength = (float) Math.hypot(viewWidth, viewHeight);//view对角线长度
int midpoint_ce = (int) (c.x + e.x) / 2;//ce中点
int midpoint_jh = (int) (j.y + h.y) / 2;//jh中点
float minDisToControlPoint = Math.min(Math.abs(midpoint_ce - e.x), Math.abs(midpoint_jh - h.y));//中点到控制点的最小值
int left;
int right;
int top = (int) c.y;
int bottom = (int) (viewDiagonalLength + c.y);
GradientDrawable gradientDrawable;
if (style.equals(STYLE_TOP_RIGHT)) {
gradientDrawable = drawableCTopRight;
left = (int) (c.x - lightOffset);
right = (int) (c.x + minDisToControlPoint + deepOffset);
} else {
gradientDrawable = drawableCLowerRight;
left = (int) (c.x - minDisToControlPoint - deepOffset);
right = (int) (c.x + lightOffset);
}
gradientDrawable.setBounds(left,top,right,bottom);
float mDegrees = (float) Math.toDegrees(Math.atan2(e.x- f.x, h.y - f.y));
canvas.rotate(mDegrees, c.x, c.y);
gradientDrawable.draw(canvas);
}
/**
* 绘制区域C
* @return
*/
private Path getPathC(){
pathC.reset();
pathC.moveTo(i.x,i.y);//移动到i点
pathC.lineTo(d.x,d.y);//移动到d点
pathC.lineTo(b.x,b.y);//移动到b点
pathC.lineTo(a.x,a.y);//移动到a点
pathC.lineTo(k.x,k.y);//移动到k点
pathC.close();//闭合区域
return pathC;
}
/**
* 计算各点坐标
* @param a
* @param f
*/
private void calcPointsXY(MyPoint a, MyPoint f){
g.x = (a.x + f.x) / 2;
g.y = (a.y + f.y) / 2;
e.x = g.x - (f.y - g.y) * (f.y - g.y) / (f.x - g.x);
e.y = f.y;
h.x = f.x;
h.y = g.y - (f.x - g.x) * (f.x - g.x) / (f.y - g.y);
c.x = e.x - (f.x - e.x) / 2;
c.y = f.y;
j.x = f.x;
j.y = h.y - (f.y - h.y) / 2;
b = getIntersectionPoint(a,e,c,j);
k = getIntersectionPoint(a,h,c,j);
d.x = (c.x + 2 * e.x + b.x) / 4;
d.y = (2 * e.y + c.y + b.y) / 4;
i.x = (j.x + 2 * h.x + k.x) / 4;
i.y = (2 * h.y + j.y + k.y) / 4;
//计算d点到ae的距离
float lA = a.y-e.y;
float lB = e.x-a.x;
float lC = a.x*e.y-e.x*a.y;
lPathAShadowDis = Math.abs((lA*d.x+lB*d.y+lC)/(float) Math.hypot(lA,lB));
//计算i点到ah的距离
float rA = a.y-h.y;
float rB = h.x-a.x;
float rC = a.x*h.y-h.x*a.y;
rPathAShadowDis = Math.abs((rA*i.x+rB*i.y+rC)/(float) Math.hypot(rA,rB));
}
/**
* 计算两线段相交点坐标
* @param lineOne_My_pointOne
* @param lineOne_My_pointTwo
* @param lineTwo_My_pointOne
* @param lineTwo_My_pointTwo
* @return 返回该点
*/
private MyPoint getIntersectionPoint(MyPoint lineOne_My_pointOne, MyPoint lineOne_My_pointTwo, MyPoint lineTwo_My_pointOne, MyPoint lineTwo_My_pointTwo){
float x1,y1,x2,y2,x3,y3,x4,y4;
x1 = lineOne_My_pointOne.x;
y1 = lineOne_My_pointOne.y;
x2 = lineOne_My_pointTwo.x;
y2 = lineOne_My_pointTwo.y;
x3 = lineTwo_My_pointOne.x;
y3 = lineTwo_My_pointOne.y;
x4 = lineTwo_My_pointTwo.x;
y4 = lineTwo_My_pointTwo.y;
float pointX =((x1 - x2) * (x3 * y4 - x4 * y3) - (x3 - x4) * (x1 * y2 - x2 * y1))
/ ((x3 - x4) * (y1 - y2) - (x1 - x2) * (y3 - y4));
float pointY =((y1 - y2) * (x3 * y4 - x4 * y3) - (x1 * y2 - x2 * y1) * (y3 - y4))
/ ((y1 - y2) * (x3 - x4) - (x1 - x2) * (y3 - y4));
return new MyPoint(pointX,pointY);
}
/**
* 计算C点的X值
* @param a
* @param f
* @return
*/
private float calcPointCX(MyPoint a, MyPoint f){
MyPoint g,e;
g = new MyPoint();
e = new MyPoint();
g.x = (a.x + f.x) / 2;
g.y = (a.y + f.y) / 2;
e.x = g.x - (f.y - g.y) * (f.y - g.y) / (f.x - g.x);
e.y = f.y;
return e.x - (f.x - e.x) / 2;
}
public float getViewWidth(){
return viewWidth;
}
public float getViewHeight(){
return viewHeight;
}
}
