// 直方图最大高度
private int maxHistogramHeight;
// 轴线画笔
private Paint coordinateAxisPaint;
// 组名画笔
private Paint groupNamePaint;
private Paint.FontMetrics groupNameFontMetrics;
private Paint.FontMetrics histogramValueFontMetrics;
// 直方图数值画笔
private Paint histogramValuePaint;
// 直方图画笔
private Paint histogramPaint;
// 直方图绘制区域
private Rect histogramPaintRect;
// 直方图表视图总宽度
private int histogramContentWidth;
// 存储组内直方图shader color，例如，每组有3个直方图，该SparseArray就存储3个相对应的shader color
private SparseArray<int[]> histogramShaderColorArray;
private List<MultiGroupHistogramGroupData> dataList;
private SparseArray<Float> childMaxValueArray;
private Scroller scroller;
private int minimumVelocity;
private int maximumVelocity;
private VelocityTracker velocityTracker;
public MultiGroupHistogramView(Context context) {
this(context, null);
}
public MultiGroupHistogramView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public MultiGroupHistogramView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs);
}
private void init(AttributeSet attrs) {
setLayerType(View.LAYER_TYPE_HARDWARE, null);
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.MultiGroupHistogramView);
coordinateAxisWidth = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_coordinateAxisWidth,
DisplayUtil.dp2px(2));
// 坐标轴线颜色
int coordinateAxisColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_coordinateAxisColor,
Color.parseColor("#434343"));
// 底部小组名称字体颜色
int groupNameTextColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_groupNameTextColor,
Color.parseColor("#CC202332"));
groupNameTextSize = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_groupNameTextSize,
DisplayUtil.dp2px(15));
groupInterval = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_groupInterval,
DisplayUtil.dp2px(30));
histogramInterval = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramInterval,
DisplayUtil.dp2px(10));
// 直方图数值文本颜色
int histogramValueTextColor = typedArray.getColor(R.styleable.MultiGroupHistogramView_histogramValueTextColor,
Color.parseColor("#CC202332"));
histogramValueTextSize =
typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramValueTextSize, DisplayUtil.dp2px(12));
histogramValueDecimalCount = typedArray.getInt(R.styleable.MultiGroupHistogramView_histogramValueDecimalCount, 0);
histogramHistogramWidth =
typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramHistogramWidth,
DisplayUtil.dp2px(20));
chartPaddingTop = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_chartPaddingTop,
DisplayUtil.dp2px(10));
histogramPaddingStart = typedArray.getDimensionPixelSize(R.styleable.MultiGroupHistogramView_histogramPaddingStart,
