本文将通过示例代码介绍如何自定义简单的直方图表,此图表并非常见的直方图表,而是可以分组的。此文不会过多涉及原理,比较简单,示例图片如下(gif图片没有制作的好,有闪烁,请见谅):
公开课MultiGroupHistogramView扩展视图{
私人int宽度;
私人int高度;//坐标轴线宽度
私人int coordinateAxisWidth;//组名称字体大小
私人int groupNameTextSize;//小组之间间距
私人int groupInterval;//组内子直方图间距
私人int histogramInterval;
私人int histogramValueTextSize;//图表数值小数点位数
私人int histogramValueDecimalCount;
私人int histogramHistogramWidth;
私人int chartPaddingTop;
私人int histogramPaddingStart;
私人int histogramPaddingEnd;//各组名称到X轴的距离
私人int distanceFormGroupNameToAxis;//直方图上方数值到直方图的距离
私人int distanceFromValueToHistogram;//直方图最大高度
私人int maxHistogramHeight;//轴线画笔
私人油漆coordinateAxisPaint;//组名画笔
私人油漆groupNamePaint;
私人油漆。FontMetrics groupNameFontMetrics;
私人油漆。FontMetrics histogramValueFontMetrics;//直方图数值画笔
私人油漆histogramValuePaint;//直方图画笔
私人油漆histogramPaint;//直方图绘制区域
私人矩形histogramPaintRect;//直方图表视图总宽度
私人int histogramContentWidth;//存储组内直方图材质颜色,例如,每组有3个直方图,该SparseArray就存储3个相对应的材质颜色
私人SparseArraydataList;
私人SparseArraychildMaxValueArray;
私人照片卷轴照片卷轴;
私人int minimumVelocity;
私人int maximumVelocity;
私人VelocityTracker VelocityTracker;
公共MultiGroupHistogramView(上下文语境){
这(上下文,null);
}
公共MultiGroupHistogramView(上下文语境,@Nullable AttributeSet attrs) {
这(上下文、attrs 0);
}
公共MultiGroupHistogramView(上下文语境,@Nullable AttributeSet attrs, int defStyleAttr) {
超级(上下文、attrs defStyleAttr);
init (attrs);
}
私人空间init (AttributeSet attrs) {
setLayerType(视图。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 DisplayUtil.dp2px (15));
histogramPaddingEnd=typedArray.getDimensionPixelSize (R.styleable。MultiGroupHistogramView_histogramPaddingEnd DisplayUtil.dp2px (15));
distanceFormGroupNameToAxis=typedArray.getDimensionPixelSize (R.styleable。MultiGroupHistogramView_distanceFormGroupNameToAxis DisplayUtil.dp2px (15));
distanceFromValueToHistogram=typedArray.getDimensionPixelSize (R.styleable。MultiGroupHistogramView_distanceFromValueToHistogram DisplayUtil.dp2px (10));
typedArray.recycle ();
coordinateAxisPaint=new油漆(Paint.ANTI_ALIAS_FLAG);
coordinateAxisPaint.setStyle (Paint.Style.FILL);
coordinateAxisPaint.setStrokeWidth (coordinateAxisWidth);
coordinateAxisPaint.setColor (coordinateAxisColor);
groupNamePaint=new油漆(Paint.ANTI_ALIAS_FLAG);
groupNamePaint.setTextSize (groupNameTextSize);
groupNamePaint.setColor (groupNameTextColor);
groupNameFontMetrics=groupNamePaint.getFontMetrics ();
histogramValuePaint=new油漆(Paint.ANTI_ALIAS_FLAG);
histogramValuePaint.setTextSize (histogramValueTextSize);
histogramValuePaint.setColor (histogramValueTextColor);
histogramValueFontMetrics=histogramValuePaint.getFontMetrics ();
histogramPaintRect=new矩形();
histogramPaint=new油漆(Paint.ANTI_ALIAS_FLAG);
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