`
1. HistogramComponent组件功能介绍
1.1. 功能介绍
在开发柱状图的过程中,通过自定义组件HistogramComponent可以更快速实现一个简单的柱状图功能,对外提供数据源,修改柱状图颜色和间距的接口。
1.2. phone模拟器上运行效果
2 . HistogramComponent使用方法
新建工程,增加组件Har包依赖,在应用模块中调用HAR,常用的添加依赖方式包括如下两种。
Ø 方式一:依赖本地HAR,将histogramcomponent-debug.har复制到entrylibs目录下即可(由于build.gradle已经依赖的libs目录下的*.har,因此不需要再做修改)。
Ø 方式二:查看工程目录中build.gradle下的*.har是否存在。
以上操作无误之后就可以进行编码了!
3 . HistogramComponent开发实现
3.1 . 主页面的布局文件
3.2. 主页面的Ability的代码
- @Override
- public void onStart(Intent intent) {
- super.onStart(intent);
- super.setUIContent(ResourceTable.Layout_ability_main);
- bargraphview = (HistogramComponent) findComponentById(ResourceTable.Id_bargraphview);
- // 设置每组柱状图之间的间距
- bargraphview.mLineSpaceWidth = 30;
- final int[][] data = {{182, 89, 78, 88}, {34, 85, 16, 96}, {86, 127, 45, 41},{54, 75, 54, 12}};
- final int[] colorData = {0xFF222233, 0xFFe67656, 0xFF188888,0xFF888888,0xFF888888};
- final String[] textData = {"一月份", "二月份", "三月份", "四月份"};
- // 核心接口,填充数据,柱状图色彩
- bargraphview.setBarGraphData(data, colorData, textData);
- }
复制代码 3.3. HistogramComponent组件核心代码
- /**
- * 定义DrawTask对象的实例
- * 这里进行具体的绘画工作
- */
- private DrawTask drawTask = new DrawTask() {
- @Override
- public void onDraw(Component component, Canvas canvas) {
- bottomHeight = heightMeasureSpec - mBottomXWidth;
- if (barGraphDataList == null || barGraphDataList.length <= 0)
- return;
- //画柱状图
- drawBarGraph(canvas);
- //画XY轴坐标
- drawXYLine(canvas);
- //给XY轴坐标写字
- drawXYText(canvas);
- }
- };
- //画柱状图
- private void drawBarGraph(Canvas canvas) {
- if (barGraphDataList != null && barGraphDataList.length > 0) {
- for (int i = 0; i < barGraphDataList[0].length; i++) {
- float startX = mLineSpaceWidth * (i + 1) + mLineWidth * barGraphDataList.length * i + mLeftYWidth + (10) + mLineWidth / 2;
- int index = 0;
- while (index < barGraphDataList.length) {
- if (barGraphColorList != null && barGraphColorList.length > index) {
- mBarGraphPaint.setColor(new Color(barGraphColorList[index]));
- mBarGraphTextPaint.setColor(new Color(barGraphColorList[index]));
- } else {
- mBarGraphPaint.setColor(new Color(barGraphBgColor));
- mBarGraphTextPaint.setColor(new Color(barGraphBgColor));
- }
- float stopY = bottomHeight * 0.9f / maxHeight * barGraphDataList[index][i];
- canvas.drawLine(new Point(startX, bottomHeight), new Point(startX, bottomHeight - stopY), mBarGraphPaint);
- String text = String.valueOf(barGraphDataList[index][i]);
- float textWidth = mBarGraphTextPaint.measureText(text);
- canvas.drawText(mBarGraphTextPaint,text, startX - textWidth / 2, bottomHeight - stopY - 10);
- startX += mLineWidth;
- index++;
- }
- }
- }
- }
- //画X轴和Y轴的竖线+箭头
- private void drawXYLine(Canvas canvas) {
- /**
- * 让Y轴文字与最左有dip2px(10)的边距
- **/
- //Y轴竖线
- canvas.drawLine(new Point((10) + mLeftYWidth, bottomHeight), new Point((10) + mLeftYWidth, 10), mXYLinePaint);
- //X轴竖线
- canvas.drawLine(new Point((10) + mLeftYWidth, bottomHeight), new Point(widthMeasureSpec - 10, bottomHeight), mXYLinePaint);
- //画个箭头Y轴
- canvas.drawLine(new Point((10) + mLeftYWidth, 10), new Point((6) + mLeftYWidth, 20), mXYLinePaint);
- canvas.drawLine(new Point((10) + mLeftYWidth, 10), new Point((14) + mLeftYWidth, 20), mXYLinePaint);
- //X轴箭头
- canvas.drawLine(new Point(widthMeasureSpec - 10, bottomHeight), new Point(widthMeasureSpec - 20, bottomHeight - (4)), mXYLinePaint);
- canvas.drawLine(new Point(widthMeasureSpec - 10, bottomHeight), new Point(widthMeasureSpec - 20, bottomHeight + (4)), mXYLinePaint);
- }
- //给Y轴和X轴写相应的文字
- private void drawXYText(Canvas canvas) {
- if (isShowYText) {
- //Y轴写字
- for (int i = 1; i <= 5; i++) {
- float startY = bottomHeight - bottomHeight * 0.9f / maxHeight * maxHeight / 5 * i;
- canvas.drawLine(new Point((10) + mLeftYWidth, startY), new Point((15) + mLeftYWidth, startY), mYTextPaint);
- float width = mYTextPaint.measureText(maxHeight / 5 * i + "");
- float dy = 12.0f;
- canvas.drawText(mYTextPaint,maxHeight / 5 * i + "", (int) ((10) + mLeftYWidth - width - (5)), startY + dy);
- }
- }
- if (!isShowXText) {
- return;
- }
- //X轴写字
- if (barGraphTextList != null && barGraphTextList.length > 0) {
- for (int i = 0; i < barGraphTextList.length; i++) {
- float startX = mLineSpaceWidth * (i + 1) + mLineWidth * barGraphDataList.length * i + mLeftYWidth + (10);
- //中间有一个间隔
- startX = startX + (mLineWidth * barGraphDataList.length) * 1.0f / 2;
- float textWidth = mXTextPaint.measureText(barGraphTextList[i]);
- canvas.drawText(mXTextPaint,barGraphTextList[i], startX - textWidth / 2, heightMeasureSpec - (5));
- }
- }
- }
- // 对外提供的核心接口
- public void setBarGraphData(int[][] barGraphDataList, int[] barGraphColorList, String[] barGraphTextList) {
- this.barGraphDataList = barGraphDataList;
- this.barGraphColorList = barGraphColorList;
- this.barGraphTextList = barGraphTextList;
- for(int i = 0; i < barGraphDataList.length; ++i) {
- for(int j = 0; j < barGraphDataList[i].length; ++j) {
- if (this.maxHeight < barGraphDataList[i][j]) {
- this.maxHeight = barGraphDataList[i][j];
- }
- }
- }
- while(this.maxHeight % 5 != 0) {
- ++this.maxHeight;
- }
- if (barGraphTextList != null && barGraphTextList.length > 0) {
- this.isShowXText = true;
- }
- if (this.isShowYText) {
- this.mLeftYWidth = this.mYTextPaint.measureText(String.valueOf(this.maxHeight));
- }
- this.mBottomXWidth = 10.0F;
- if (this.isShowXText) {
- FontMetrics fontMetrics = this.mXTextPaint.getFontMetrics();
- this.mBottomXWidth += ((fontMetrics.bottom - fontMetrics.top) / 2.0F - fontMetrics.bottom) * 2.0F;
- }
- this.measureWidth(this.heightMeasureSpec);
- this.invalidate();
- }
复制代码项目源代码地址:https://github.com/isoftstone-dev/BarGraphView_HarmonyOS
©著作权归作者所有,如需转载,请注明出处,否则将追究法律责任
`