首先按照老规矩,无图无真相嘛,先看看先:
是不是很像呢,那具体是实现是怎样的呢,即使概括的来说就是
1.计算各个变量的值(记得是会随整个View的大小变化而变化)。
2其次利用好canvas.translate()这个方法,计算好大小移动canvas的原点。
3最后就是调用api提供的各种方法画图就是了。这么说是不是太过于简略了呢,好,现在就来
看看那具体的吧。首先看看xml有什么参数吧
<com.example.jack.besselcurve.BesselCurveView
android:id="@+id/besselCurveView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:layout_centerHorizontal="true"
app:besselColor="@color/besselColor"
app:besselColorText="@color/besselColorText"
app:friendAverageStep="6752"
app:averageStep="2603"
app:champion="Jack"
app:allStep="8765"
app:time="17:26"
app:ranking="15">
</com.example.jack.besselcurve.BesselCurveView>
各参数对应的解释如下:
//时间
private String time;
//所有步数
private int allStop;
//还有平均步数
private int friendAverageStep;
//平均步数
private int averageStep;
//排名
private String ranking;
//头像
private Bitmap champion_icon;
//冠军名字
private String champion;
接着代码段初始化所有参数:
TypedArray mTypedArray=context.getTheme().obtainStyledAttributes(attrs,R.styleable.BesselCurveView,defStyleAttr,0);
int numCount=mTypedArray.getIndexCount();
for(int i=0;i<numCount;i++){
int attr=mTypedArray.getIndex(i);
switch(attr){
case R.styleable.BesselCurveView_allStep:
allStop=mTypedArray.getInt(attr,0);
break;
case R.styleable.BesselCurveView_averageStep:
averageStep=mTypedArray.getInt(attr,0);
break;
case R.styleable.BesselCurveView_friendAverageStep:
friendAverageStep = mTypedArray.getInt(attr,0);
break;
case R.styleable.BesselCurveView_time:
time=mTypedArray.getString(attr);
break;
case R.styleable.BesselCurveView_ranking:
ranking=mTypedArray.getString(attr);
break;
case R.styleable.BesselCurveView_champion:
champion=mTypedArray.getString(attr);
break;
case R.styleable.BesselCurveView_besselColor:
mBesselCurveColor=mTypedArray.getColor(attr,Color.BLUE);
break;
case R.styleable.BesselCurveView_besselColorText:
besselColorText=mTypedArray.getColor(attr,Color.GRAY); break;
}
}
这些都是每个自定义都有的相当于模板,来初始化参数,都看的明白吧。接下来也很简单,就是初始化画笔等变量,以便于后面看画图更简单:
public void initValue(){
animSet=new AnimatorSet();
//外圆的画笔
mCirclePaint=new Paint(Paint.ANTI_ALIAS_FLAG);
mCirclePaint.setStyle(Paint.Style.STROKE);
mCirclePaint.setStrokeWidth(radius/10);
mCirclePaint.setStrokeJoin(Paint.Join.ROUND);
mCirclePaint.setStrokeCap(Paint.Cap.ROUND);
mCirclePaint.setAntiAlias(true);
//中间的文字的画笔
mCenterTextPaint=new Paint();
mCenterTextPaint.setColor(mBesselCurveColor);
mCenterTextPaint.setTextSize(radius/5);
mCenterTextPaint.setAntiAlias(true);
//除中间之外的文字的画笔
mTextPaint=new Paint();
mTextPaint.setAntiAlias(true);
//最低下的矩形
mBottomRectPaint=new Paint(Paint.ANTI_ALIAS_FLAG);
mBottomRectPaint.setColor(mBesselCurveColor);
mBottomRectPaint.setAntiAlias(true);
//虚线的画笔
mDottedLinePaint = new Paint();
mDottedLinePaint.setAntiAlias(true);
mDottedLinePaint.setStyle(Paint.Style.STROKE);
mDottedLinePaint.setStrokeWidth(2); mDottedLinePaint.setColor(mBesselCurveColor); mDottedLinePaint.setPathEffect(new DashPathEffect(new float[]{5,5},1)); //画波浪线画笔 WavylinesPaint=new Paint(); WavylinesPaint = new Paint(Paint.ANTI_ALIAS_FLAG); WavylinesPaint.setColor(wavyColor); WavylinesPaint.setStyle(Paint.Style.FILL_AND_STROKE); //虚线的画线 mDottedLinePath=new Path();
//画波浪线画线
WavyLinePath=new Path();
//底下更多的画线
morePath=new Path();
mWaveCount = (int) Math.round(widthView / mWaveLength + 1.5);
marginBottomText=radius/4;
}
好了,最重要的初始化都差不多了,现在就来画图(画画)吧先贴出所有画的代码然后再逐一讲解吧:
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.translate(widthView/2,(heightView*((float)2/3))/2);
//画内圆圈
mCirclePaint.setColor(besselColorText);
RectF mCircleRectF=new RectF(-radius,-radius,radius,radius);
canvas.drawArc(mCircleRectF,120,300,false,mCirclePaint);
//画外圆圈
mCirclePaint.setColor(mBesselCurveColor);
canvas.drawArc(mCircleRectF,120,mCircleNum,false,mCirclePaint);
//画中间的文字
Rect mCenterRect=new Rect(); String tempAllStop=mCenterNum+"";
mCenterTextPaint.getTextBounds(tempAllStop,0,tempAllStop.length(),mCenterRect);
int halfWidthText=(mCenterRect.right-mCenterRect.left)/2;
int halfHeightText=(mCenterRect.bottom-mCenterRect.top)/2;
canvas.drawText(tempAllStop,-halfWidthText,halfHeightText,mCenterTextPaint);
//画上边的文字
mTextPaint.setColor(besselColorText); mTextPaint.setTextSize(radius/6);
String tempFriendAverageStep=stringTemplate(R.string.besselTime,time);
Rect mTopRect=new Rect(); mTextPaint.getTextBounds(tempFriendAverageStep,0,tempFriendAverageStep.length(),mTopRect);
int halfTopWidthText=(mTopRect.right-mTopRect.left)/2;
canvas.drawText(tempFriendAverageStep,-halfTopWidthText,-(halfHeightText+marginText),mTextPaint);
//画下边的文字 String
tempAverageStep=stringTemplate(R.string.friendAverageStep,friendAverageStep+"");
Rect mBottomRect=new Rect();
mTextPaint.getTextBounds(tempAverageStep,0,tempAverageStep.length(),mBottomRect);
int halfBottomWidthText=(mBottomRect.right-mBottomRect.left)/2;
int mBottomHeightText=(mBottomRect.bottom-mBottomRect.top);
canvas.drawText(tempAverageStep,- halfBottomWidthText,mBottomHeightText+halfHeightText+marginText,mTextPaint);
//画排名 Rect mNumRect=new Rect();
mCenterTextPaint.getTextBounds(ranking,0,ranking.length(),mNumRect);
int halfNum=(mNumRect.right-mNumRect.left)/2;
mCenterTextPaint.setTextSize(40); canvas.drawText(ranking,- halfNum,radius,mCenterTextPaint);
String rankingLeft=getContext().getResources().getString(R.string.ranking_left);
mTextPaint.getTextBounds(rankingLeft,0,rankingLeft.length(),mNumRect);
canvas.drawText(rankingLeft,-halfNum-(mNumRect.right- mNumRect.left)/2-20,radius,mTextPaint);
canvas.drawText(getContext().getResources().getString(R.string.ranking_right),halfNum+10,radius,mTextPaint);
canvas.restore();
//画最近七天和平均运动
mTextPaint.setTextSize(radius/9); canvas.save(); canvas.translate(0,heightView*((float)2/3));
canvas.drawText(getContext().getResources().getString(R.string.nextSevenDay),marginLi neChart,0,mTextPaint);
Rect mPercentRect=new Rect();
String mPercentText=stringTemplate(R.string.averageStep,averageStep+"");
mTextPaint.getTextBounds(mPercentText,0,mPercentText.length(),mPercentRect);
canvas.drawText(mPercentText,widthView-marginLineChart-(mPercentRect.right- mPercentRect.left),0,mTextPaint);
//画虚线
mDottedLinePath.moveTo(marginLineChart,marginBottomText);
mDottedLinePath.lineTo(widthView-marginLineChart,marginBottomText);
canvas.drawPath(mDottedLinePath,mDottedLinePaint);
//画7天数据柱状图 mTextPaint.setTextSize(radius/9);
int lineWidth=(widthView-marginLineChart*2)/8;
mCalendar.setTime(new Date());
RectF mRecf=null;
if(mListStep.size()>0){
for(int i=mListStep.size();i>=1;i--){
if(mListStep.get(i-1)!=0){
int startX=marginLineChart+lineWidth*i-radius/23;
int endX=marginLineChart+lineWidth*i+radius/23;
if(mListStep.get(i-1)>mStandardStop){
//达标 mTextPaint.setColor(mBesselCurveColor);
int exceed=mListStep.get(i-1)-mStandardStop;
float standard=(float)
(mCircleRectHeight*Double.valueOf(exceed/Double.valueOf(mStandardStop)));
mRecf=new RectF(startX,marginBottomText-(standard>mCircleRectHeight?mCircleRectHeight:standard) ,endX,marginBottomText+mCircleRectHeight);
canvas.drawRoundRect(mRecf,50,50,mTextPaint);
}else{
//不达标
mTextPaint.setColor(besselColorText);
float noStandard=(float)(mCircleRectHeight*Double.valueOf(mListStep.get(i-1)/Double.valueOf(mStandardStop)));
mRecf=new RectF(startX,marginBottomText,endX,marginBottomText+( noStandard>mCircleRectHeight?mCircleRectHeight:noStandard));
canvas.drawRoundRect(mRecf,50,50,mTextPaint);
}
}
//画底下的日期
mTextPaint.setColor(besselColorText);
mCalendar.set(Calendar.DAY_OF_MONTH,mCalendar.get(Calendar.DAY_OF_MONTH)-1);
Rect rect =new Rect();
String number=stringTemplate(R.string.day,mCalendar.get(Calendar.DAY_OF_MONTH)+"");
mTextPaint.getTextBounds(number,0,number.length(),rect);
canvas.drawText(number,(marginLineChart+lineWidth*i)-(rect.right-rect.left)/2,marginBottomText+70,mTextPaint);
}
}
canvas.restore();
//画波浪图形
canvas.save();
float mWavyHeight=heightView*((float)4/5)+50;
canvas.translate(0,mWavyHeight);
WavyLinePath.reset();
WavyLinePath.moveTo(-mWaveLength+ mOffset,0);
int wHeight=radius/5;
for(int i=0;i<mWaveCount;i++){
WavyLinePath.quadTo((-mWaveLength*3/4)+(i*mWaveLength)+mOffset,wHeight,(-mWaveLength/2)+(i*mWaveLength)+mOffset,0);
WavyLinePath.quadTo((-mWaveLength/4)+(i * mWaveLength)+mOffset,- wHeight,i*mWaveLength+mOffset,0);
}
WavyLinePath.lineTo(widthView,heightView-mWavyHeight);
WavyLinePath.lineTo(0,heightView-mWavyHeight);
WavyLinePath.close();
canvas.drawPath(WavyLinePath,WavylinesPaint);
canvas.restore();
//画最低的信息
float removeHeight=mWavyHeight+(radius/5);
canvas.translate(0,removeHeight);
float rectHeight=heightView-removeHeight;
//画底下的矩形
RectF rect = new RectF(0,0,widthView,rectHeight);
canvas.drawRect(rect,mBottomRectPaint);
//画头像
int bitmap_icon_x=radius/5;
float centerHeight=rectHeight/2;
Bitmap bitmap_icon=getRoundCornerImage(champion_icon,50,radius/5,radius/5);
canvas.drawBitmap(bitmap_icon,bitmap_icon_x,centerHeight- bitmap_icon.getHeight()/2,null);
mTextPaint.setColor(Color.WHITE); mTextPaint.setTextSize(radius/8);
//画冠军文字
int champion_x=radius/2; Rect mNameRect=new Rect();
String championMame=stringTemplate(R.string.champion,champion);
mTextPaint.getTextBounds(championMame,0,championMame.length(),mNameRect);
canvas.drawText(championMame,champion_x,(rectHeight+(mNameRect.bottom-mNameRect.top))/2,mTextPaint);
//画查看
String look=getContext().getResources().getString(R.string.check);
mTextPaint.getTextBounds(look,0,look.length(),mNameRect);
canvas.drawText(look,widthView-(radius*(float)2/3),(rectHeight+(mNameRect.bottom-mNameRect.top))/2,mTextPaint);
//画更多图像
float morePoint=(radius*(float)2/3)/2;
canvas.drawLine(widthView-morePoint,centerHeight-(mNameRect.bottom- mNameRect.top)/2, widthView-morePoint+15,centerHeight,mTextPaint);
canvas.drawLine(widthView-morePoint+15,centerHeight,widthView-morePoint, centerHeight+(mNameRect.bottom-mNameRect.top)/2,mTextPaint);
}
代码是不是有点多呢,没办法画的东西本身就有点多了。好了刚开始我说要移动canvas的原点是不是,你看刚开始就移动了吧:
super.onDraw(canvas);
canvas.save();
canvas.translate(widthView/2,(heightView*((float)2/3))/2);
1、移动原点到整个圆弧的中心,其中widthView是整个view的宽,heightView是整个view的高,如下图:
就在上图的蓝色点就是现在的原点。
然后在这原点里画圆弧呗,代码如下
//画内圆圈
mCirclePaint.setColor(besselColorText);
RectF mCircleRectF=new RectF(-radius,-radius,radius,radius);
canvas.drawArc(mCircleRectF,120,300,false,mCirclePaint);
//画外圆圈
mCirclePaint.setColor(mBesselCurveColor);
canvas.drawArc(mCircleRectF,120,mCircleNum,false,mCirclePaint);
mCircleNum是为了实现动画效果的,这后面会讲,这样圆弧就画完了。效果也是如上图。
2.在中心点再画今天的走的总路程,代码如下:
//画中间的文字
Rect mCenterRect=new Rect();
String tempAllStop=mCenterNum+"";
mCenterTextPaint.getTextBounds(tempAllStop,0,tempAllStop.length(),mCenterRect);
int halfWidthText=(mCenterRect.right-mCenterRect.left)/2;
int halfHeightText=(mCenterRect.bottom-mCenterRect.top)/2;
canvas.drawText(tempAllStop,-halfWidthText,halfHeightText,mCenterTextPaint);
基本的实现思路是用Rect在这个类计算出你要画文字的大小,然后在原点画,不过,记得这里的x,y点是在原点的左下,具体详解看这里写链接内容
接这就是画时间和好友平均步数,其实实现原理也是一样的,只不过在上面的高度是
canvas.drawText(tempFriendAverageStep,-halfTopWidthText,-(halfHeightText+marginText),mTextPaint);
是中心总步数高度的一半再加间隔,而下面的是:
canvas.drawText(tempAverageStep,-halfBottomWidthText,mBottomHeightText+halfHeightText+marginText,mTextPaint);
是下面文字总的高度再加上中心总步数高度的一半再加间隔。现在效果如下图:
接着就是画排名,首先还是套路:
Rect mNumRect=new Rect();
mCenterTextPaint.getTextBounds(ranking,0,ranking.length(),mNumRect);
int halfNum=(mNumRect.right-mNumRect.left)/2;
mCenterTextPaint.setTextSize(40);
canvas.drawText(ranking,-halfNum,radius,mCenterTextPaint);
计算出排名文字的大小,然后在中心原点x轴为排名文字的一半,y轴问为半径画出排名,效果图如下:
接着就在排名的两端画文字就行了,带代码如下:
String rankingLeft=getContext().getResources().getString(R.string.ranking_left);
mTextPaint.getTextBounds(rankingLeft,0,rankingLeft.length(),mNumRect);
canvas.drawText(rankingLeft,-halfNum-(mNumRect.right-mNumRect.left)/2-20,radius,mTextPaint);
canvas.drawText(getContext().getResources().getString(R.string.ranking_right),halfNum+10,radius,mTextPaint);
思路还是一样,就不说了。此时效果
画底下柱状图是,首先用canvas.restore();恢复原点到(0,0)的状态,再用canvas.translate(0,heightView*((float)2/3));把原点移动到圆弧的下面,接着又可以继续画,实现思路和前面一样:
//画最近七天和平均运动
mTextPaint.setTextSize(radius/9);
canvas.save(); canvas.translate(0,heightView*((float)2/3));
canvas.drawText(getContext().getResources().getString(R.string.nextSevenDay),marginLineChart,0,mTextPaint);
Rect mPercentRect=new Rect();
String mPercentText=stringTemplate(R.string.averageStep,averageStep+"");
mTextPaint.getTextBounds(mPercentText,0,mPercentText.length(),mPercentRect);
canvas.drawText(mPercentText,widthView-marginLineChart-(mPercentRect.right-mPercentRect.left),0,mTextPaint);
//画虚线
mDottedLinePath.moveTo(marginLineChart,marginBottomText);
mDottedLinePath.lineTo(widthView-marginLineChart,marginBottomText);
canvas.drawPath(mDottedLinePath,mDottedLinePaint);
此时效果如下:
接下来画柱状图,首先
int lineWidth=(widthView-marginLineChart*2)/8;
计算出每个点之间的间隔
if(mListStep.size()>0){
for(int i=mListStep.size();i>=1;i--){
if(mListStep.get(i-1)!=0){
//计算出起始点X和终点X的值
int startX=marginLineChart+lineWidth*i-radius/23;
int endX=marginLineChart+lineWidth*i+radius/23;
if(mListStep.get(i-1)>mStandardStop){
//达标 mTextPaint.setColor(mBesselCurveColor);
//超出的部分
int exceed=mListStep.get(i-1)-mStandardStop;
//算出柱体大小 float standard=(float) (mCircleRectHeight*Double.valueOf(exceed/Double.valueOf(mStandardStop)));
mRecf=new RectF(startX,marginBottomText-(standard>mCircleRectHeight?mCircleRectHeight:standard) ,endX,marginBottomText+mCircleRectHeight);
canvas.drawRoundRect(mRecf,50,50,mTextPaint);
}else{
//不达标
mTextPaint.setColor(besselColorText);
//算出不达标柱体的大小
float noStandard=(float)(mCircleRectHeight*Double.valueOf(mListStep.get(i-1)/Double.valueOf(mStandardStop)));
mRecf=new RectF(startX,marginBottomText,endX,marginBottomText+( noStandard>mCircleRectHeight?mCircleRectHeight:noStandard));
canvas.drawRoundRect(mRecf,50,50,mTextPaint);
}
}
//画底下的日期
mTextPaint.setColor(besselColorText);
mCalendar.set(Calendar.DAY_OF_MONTH,mCalendar.get(Calendar.DAY_OF_MONTH)-1);
Rect rect =new Rect();
String number=stringTemplate(R.string.day,mCalendar.get(Calendar.DAY_OF_MONTH)+"");
mTextPaint.getTextBounds(number,0,number.length(),rect);
canvas.drawText(number,(marginLineChart+lineWidth*i)-(rect.right-rect.left)/2,marginBottomText+70,mTextPaint);
}
}
mStandardStop是达标的数据,当数据小于mStandardStop就是不达标,所以柱状图就要画在虚线的下面,mCircleRectHeight是柱状图一半的高
float standard=(float)(mCircleRectHeight*Double.valueOf(exceed/Double.valueOf(mStandardStop)));
这句代码是计算出下面圆柱体的具体大小,noStandard>mCircleRectHeight?mCircleRectHeight:noStandard
当,但柱状图大于mCircleRectHeight时就用mCircleRectHeight不然就根据计算的数值来。当数据大于mStandardStop时,
int exceed=mListStep.get(i-1)-mStandardStop;float standard=(float)(mCircleRectHeight*Double.valueOf(exceed/Double.valueOf(mStandardStop)));
exceed是计算出超出的部分,再拿超出的部分算出具体的大小,剩下的和小于的一样,当standard大于最大的mCircleRectHeight是就用mCircleRectHeight否则就用standard。底下日期是用Calendar得到前7天的日期再循环的画上去,思路和上面一样不再赘述。此时效果如下:
接下来是画波浪,画波浪是用了贝塞尔曲线的方法画的,如果不懂贝塞尔曲线请参考这里写链接内容,这也是我学贝塞尔曲线参考的内容。首先我们又把canvas恢复到原点canvas.restore();
再用float mWavyHeight=heightView*((float)4/5)+50; canvas.translate(0,mWavyHeight);
移动这个位置,是为了适配。
WavyLinePath.reset();
WavyLinePath.moveTo(-mWaveLength+ mOffset,0);
int wHeight=radius/5; for(int i=0;i<mWaveCount;i++){
WavyLinePath.quadTo((-mWaveLength*3/4)+(i*mWaveLength)+mOffset,wHeight,(-mWaveLength/2)+(i*mWaveLength)+mOffset,0);
WavyLinePath.quadTo((-mWaveLength/4)+(i * mWaveLength)+mOffset,-wHeight,i*mWaveLength+mOffset,0);
}
WavyLinePath.lineTo(widthView,heightView-mWavyHeight);
WavyLinePath.lineTo(0,heightView-mWavyHeight);
WavyLinePath.close();
canvas.drawPath(WavyLinePath,WavylinesPaint);
WavyLinePath.quadTo就是贝塞尔曲线调的方法,for循环几次使之形成波浪图形,记得一样要WavyLinePath.lineTo().不让会出现底下有些地方会画不到。原理是向上定一个控制点有向下定一个控制点使之形成一个sin函数图形。具体请学贝塞尔曲线。此时效果图:
最后就是画底下的矩形和头像和文字了。最值得讲的是头像我一开始的设想的传Url的,不过这样子又要做网络方面的代码工作,这样子会破怀类的功能单一性原则,所以最后我实在外部传一个位图,在位图进行处理使其圆角。剩下的只是画文字而已,上面已经讲够多了,就不在讲了。
对了,最后还有一个刚开始的动画效果。
public void startAnimator(){
ValueAnimator mCircleAminator=ValueAnimator.ofFloat(0f,300f);
mCircleAminator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {
mCircleNum=(float)animation.getAnimatedValue(); postInvalidate();
}
});
ValueAnimator mCenterText=ValueAnimator.ofInt(0,allStop);
mCenterText.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {
mCenterNum=(int)animation.getAnimatedValue(); postInvalidate();
} });
ValueAnimator mWavyAnimator = ValueAnimator.ofInt(0, mWaveLength);
mWavyAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) {
mOffset = (int) animation.getAnimatedValue(); postInvalidate();
} });
animSet.setDuration(2000);
animSet.playTogether(mCircleAminator,mCenterText,mWavyAnimator);
animSet.start();
}
//字符串拼接
public String stringTemplate(int template,String content){
return String.format(getContext().getResources().getString(template),content);
}
其实也简单通过设置ValueAnimator让它在规定的时间内产生数值的变化,再调用postInvalidate().对View的界面进行刷新即可实现动画效果。
最后给源码好好研究吧源码只有好好看源码才能学到更多东西。
如果对你有帮助就请给我给星星或喜欢吧。