Android简易柱状图和曲线图表实现

之前有写过一个图表lib,但是开发的速度,大多很难跟上产品需求变化的脚步,所以修改了下原先的图表库,支持图表下面能整合table显示对应的类目,用曲线替换了折线,支持多曲线的显示,增加了显示的动画,,增加了一些可定制的属性,支持水平柱状图和叠加柱状图,以及多曲线图和饼状图的显示

1.效果图

2.各种图表的使用方式

1.饼状图 这个和原先的使用一样,只不过增加了一个动画,可以参看之前的文章,饼状图使用

2.水平多柱状图

2.1 xml布局

<wellijohn.org.varchart.hor_bar_with_line_chart.ChartLine
        android:id="@+id/chartline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/white"
        app:default_x_visible_num="4.2"//一个屏幕中显示多少列
        app:y_interval="40dp"//Y轴的间距
        app:y_num_text_max_width="56dp"//y轴左边的文字的宽度 />
还有y_visible_num:y轴需要显示几列

2.2 数据设置

public class HorBarActivity extends AppCompatActivity {

  //显示的坐标点
    private ChartLine mChartline;

    //多条折线的坐标点
    private List<List<DotVo>> mMulListDisDots;


    //x轴的点
    private String[] mXdots = new String[]{"08/18"
            , "08/19",
            "08/20", "08/21", "08/22", "08/23", "08/24",
            "08/25", "08/26", "08/27", "08/28", "08/29", "09/01", "09/02", "09/23",
    };

    private double mMax = 44;

    private Random rand = new Random();

    private List<CategoryVo> mCategoryList;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hor_bar);

        initView();
        initMulTestData();
        initCategoryList();
        try {
            mChartline.setYAxisMaxValue(mMax).setXdots(mXdots).setAnimationOpen(true).setListDisDots(mMulListDisDots).
                    setCategoryList(mCategoryList).reDraw();
        } catch (YCoordinateException e) {
            Log.d("MainActivity", "onCreate: ");
            e.printStackTrace();
        }
    }


    /**
     * 柱状图的数据,是一个list,一个CategoryVo,就是一列中增加一个柱状
     * CategoryVo:{
     *      卡券类目的名称
     *      private String categoryName;
     *      每个卡券类目的值
     *      private List<String> categoryValueList;
     * }
     */
    private void initCategoryList() {
        mCategoryList = new ArrayList<>();
        mCategoryList.add(new CategoryVo());
        mCategoryList.add(new CategoryVo());
        mCategoryList.add(new CategoryVo());
    }


    /**
     * 初始化曲线图,private List<List<DotVo>> mMulListDisDots;
     * List<DotVo>>就是一条曲线图,
     */
    private void initMulTestData() {
        mMulListDisDots = new ArrayList<>();

        for (int i = 0; i < 3; i++) {
            ArrayList<DotVo> temp = new ArrayList();
            DotVo tempDotVo = new DotVo("08/18", rand.nextInt((int) mMax));
            temp.add(tempDotVo);
            DotVo tempDotVo1 = new DotVo("08/19", rand.nextInt((int) mMax));
            temp.add(tempDotVo1);
            DotVo tempDotVo2 = new DotVo("08/20", rand.nextInt((int) mMax));
            temp.add(tempDotVo2);
            DotVo tempDotVo3 = new DotVo("08/21", rand.nextInt((int) mMax));
            temp.add(tempDotVo3);
            DotVo tempDotVo4 = new DotVo("08/22", rand.nextInt((int) mMax));
            temp.add(tempDotVo4);
            DotVo tempDotVo5 = new DotVo("08/23", rand.nextInt((int) mMax));
            temp.add(tempDotVo5);
            DotVo tempDotVo6 = new DotVo("09/02", rand.nextInt((int) mMax));
            temp.add(tempDotVo6);

            mMulListDisDots.add(temp);
        }


    }


    private void initView() {
        mChartline = findViewById(R.id.chartline);
    }
}

3.叠加柱状图

3.1 xml布局

<wellijohn.org.varchart.overlay_bar_with_line_chart.OverLayBarChartLine
        android:id="@+id/overlay_chart_line"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:visibility="visible"
        app:overlay_default_x_visible_num="4.2"
        app:overlay_y_interval="40dp"
        app:overlay_y_num_text_max_width="56dp" />

3.2 数据设置,如2.2一样

3.实现的几个关键点

3.1 宽度需要重写,onMeasure,因为的控件的宽度是大于屏幕的宽度的,宽度是根据显示的x轴的点和间距,以及y轴坐标的文字的所占的宽度的距离所组成。

int widthParentMeasureMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthParentMeasureSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightParentMeasureMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightParentMeasureSize = MeasureSpec.getSize(heightMeasureSpec);
        int resultWidthSize = 0;
        int resultHeightSize = 0;
        int resultWidthMode = MeasureSpec.EXACTLY;//用来对childView进行计算的
        int resultHeightMode = MeasureSpec.EXACTLY;
        int paddingWidth = getPaddingLeft() + getPaddingRight();
        int paddingHeight = getPaddingTop() + getPaddingBottom();
        ViewGroup.LayoutParams thisLp = getLayoutParams();
        switch (widthParentMeasureMode) {
            //父类不加限制给子类
            case MeasureSpec.UNSPECIFIED:
                //这个代表在布局写死了宽度
                if (thisLp.width > 0) {
                    resultWidthSize = thisLp.width;
                    resultWidthMode = MeasureSpec.EXACTLY;
                } else {
                    resultWidthSize = (int) (getYMaxTextWidth() + mXinterval * mXdots.length);
                    resultWidthMode = MeasureSpec.UNSPECIFIED;
                }
                break;
            case MeasureSpec.AT_MOST:
                //这个代表在布局写死了宽度
                if (thisLp.width > 0) {
                    resultWidthSize = thisLp.width;
                    resultWidthMode = MeasureSpec.EXACTLY;
                } else if (thisLp.width == ViewGroup.LayoutParams.MATCH_PARENT) {
                    resultWidthSize = Math.max(0, widthParentMeasureSize - paddingWidth);
                    resultWidthMode = MeasureSpec.AT_MOST;
                } else if (thisLp.width == ViewGroup.LayoutParams.WRAP_CONTENT) {
                    resultWidthSize = (int) (getYMaxTextWidth() + mXinterval * mXdots.length);
                    resultWidthMode = MeasureSpec.AT_MOST;
                }
                break;
            case MeasureSpec.EXACTLY:
                //这个代表在布局写死了宽度
                if (thisLp.width > 0) {
                    resultWidthSize = Math.min(widthParentMeasureSize, thisLp.width);
                    resultWidthMode = MeasureSpec.EXACTLY;
                } else if (thisLp.width == ViewGroup.LayoutParams.MATCH_PARENT) {
                    resultWidthSize = widthParentMeasureSize;
                    resultWidthMode = MeasureSpec.EXACTLY;
                } else if (thisLp.width == ViewGroup.LayoutParams.WRAP_CONTENT) {
                    resultWidthSize = (int) (getYMaxTextWidth() + mXinterval * mXdots.length);
                    resultWidthMode = MeasureSpec.AT_MOST;
                }
                break;
        }


        setMeasuredDimension(MeasureSpec.makeMeasureSpec(resultWidthSize, resultWidthMode),
                MeasureSpec.makeMeasureSpec(resultHeightSize, resultHeightMode));

3.2 规划固定的区域,在超出区域的部分不可见,这个在之前用的bitmap来实现,总感觉别扭,后面读官方的源码的时候,了解了canvas的clipRect方法,我们在绘制这块的时候,onDraw方法中调用

int clipRestoreCount = canvas.save();
    canvas.clipRect(mContentRect);//绘制之前调用
    doDraw();//进行想要的绘制
    canvas.restoreToCount(clipRestoreCount);//绘制完成调用restoreToCount恢复到绘制这块之前的状态

3.3 动画我们基本都可以用ValueAnimator来实现,比如说饼状图:他的一个绘制是0-360的角度的转变,我们就可以

private void startPathAnim(long duration) {
        ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 360);
        valueAnimator.setDuration(duration);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mDrawAngle = (float) animation.getAnimatedValue();
                ViewCompat.postInvalidateOnAnimation(CirclePercentChart.this);
            }
        });

        valueAnimator.start();

    }

然后通过mDrawAngle来控制每次绘制的角度,这样就可以有从0-360度绘制的感觉,那个柱状图的动画也是一样的,以不变应万变。

3.4 贝塞尔曲线绘制的算法

if (i == 0) {// 第一条为二阶贝塞尔
        path.moveTo(mDots[0], mDots[1] + (mLastHorLineY - mDots[1]) * mPhaseY);// 起点
    } else {
        float cpx = preX + (mDots[0] - preX) / 2.0f;
        path.cubicTo(cpx, preY + (mLastHorLineY - preY) * mPhaseY,
                cpx, mDots[1] + (mLastHorLineY - mDots[1]) * mPhaseY,
                mDots[0], mDots[1] + (mLastHorLineY - mDots[1]) * mPhaseY);}

在绘制贝塞尔曲线,我仔细去查过这些控制点的计算规则,有根据三点,来计算出两个控制点,但是这样绘制出来在三个点内部曲线是很平滑的,但是在接下来的第四个点的衔接的时候,感觉不是很好,所以我还是用了上面的计算方法来计算控制点,算法我贴出来,参数分别是1,2,3的x和y坐标和弯曲系数

public static ControlPonits getControlPoints(double x0, double y0, double x1, double y1, double x2, double y2, double paramCoefficient) {
        double d01 = Math.sqrt(Math.pow(x1 - x0, 2) + Math.pow(y1 - y0, 2));
        double d12 = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
        double fa = paramCoefficient * d01 / (d01 + d12);   // scaling factor for triangle Ta
        double fb = paramCoefficient * d12 / (d01 + d12);   // ditto for Tb, simplifies to fb=t-fa
        double p1x = x1 - fa * (x2 - x0);    // x2-x0 is the width of triangle T
        double p1y = y1 - fa * (y2 - y0);    // y2-y0 is the height of T
        double p2x = x1 + fb * (x2 - x0);
        double p2y = y1 + fb * (y2 - y0);
        ControlPonits tempControlPoints = new ControlPonits();

        tempControlPoints.beforeControlPointX = (float) p1x;
        tempControlPoints.beforeControlPointY = (float) p1y;
        tempControlPoints.afterControlPointX = (float) p2x;
        tempControlPoints.afterControlPointY = (float) p2y;
        return tempControlPoints;
    }

github地址

如果大家有好的想法的话,希望能够交流下,如果你们觉得文章对你自定义view有帮助,希望你们帮忙点个赞或者关注下,谢谢

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