c# 设置TeeChart控件的提示文本
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2022-06-23 11:22:10
使用第三方steema的teechart控件,设置鼠标放在某一线条点上,显示某一点的数据标签问题(虚线型十字光标基准线,放在线上显示对应点的二维坐标轴数据数据),调用initteecharttipto...
使用第三方steema的teechart控件,设置鼠标放在某一线条点上,显示某一点的数据标签问题(虚线型十字光标基准线,放在线上显示对应点的二维坐标轴数据数据),调用initteecharttiptools方法即可:
/// <summary> /// teechart线条的指示工具 /// </summary> steema.teechart.tools.cursortool cursortool; /// <summary> /// 鼠标指示显示的文本 /// </summary> private steema.teechart.tools.annotation annotation; /// <summary> /// 初始化线条的提示工具信息 /// </summary> private void initteecharttiptools(steema.teechart.tchart tchart) { //以线形式对标坐标轴 cursortool = new steema.teechart.tools.cursortool(tchart.chart); cursortool.style = steema.teechart.tools.cursortoolstyles.both; cursortool.pen.style = system.drawing.drawing2d.dashstyle.dash; cursortool.pen.color = color.black; cursortool.followmouse = true; cursortool.change += cursortool_change; //设置提示文本的信息 annotation = new steema.teechart.tools.annotation(tchart.chart); annotation.shape.font.name = "arial"; annotation.shape.font.size = 12; annotation.shape.pen.visible = true; annotation.shape.shadow.visible = false; annotation.shape.shapestyle = steema.teechart.drawing.textshapestyle.rectangle; annotation.position = steema.teechart.tools.annotationpositions.leftbottom; annotation.textalign = stringalignment.center; for (int i = 0; i < tchart.series.count; i++) { tchart.series[i].mouseenter += line_mouseenter; tchart.series[i].mouseleave += line_mouseleave; } tchart.mouseleave += tchart_mouseleave; tchart.mouseenter += tchart_mouseenter; } /// <summary> /// 鼠标进入teechart的事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void tchart_mouseenter(object sender, eventargs e) { cursortool.chart=tchartcurve.chart; } /// <summary> /// 鼠标离开teechart的事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void tchart_mouseleave(object sender, eventargs e) { cursortool.chart = null; } /// <summary> /// 当鼠标进入线条时,将teechart的cursortool工具指示的线条设置为对应的线条 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void line_mouseenter(object sender, eventargs e) { cursortool.series = sender as steema.teechart.styles.series; } /// <summary> /// 当鼠标离开线条时,将teechart的cursortool工具指示的线条设置为null /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void line_mouseleave(object sender, eventargs e) { cursortool.series = null; } /// <summary> /// 鼠标指示工具改变事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void cursortool_change(object sender, steema.teechart.tools.cursorchangeeventargs e) { try { steema.teechart.tools.cursortool cursor = sender as steema.teechart.tools.cursortool; if (cursor != null && cursor.series != null) { annotation.text = string.format("({0},{1})", cursor.xvalue.tostring("f1"), cursor.yvalue.tostring("f1")); annotation.top = cursor.series.getvertaxis.calcyposvalue(interpolatelineseries(cursor.series, cursor.xvalue)); annotation.left = tchartcurve.axes.bottom.calcxposvalue(cursor.xvalue); annotation.top -= 20;//将文本放在鼠标上方 sizef size = this.creategraphics().measurestring(annotation.text, new font(annotation.shape.font.name, annotation.shape.font.size)); if (annotation.left + size.width + 12 >= annotation.chart.width) { annotation.left -= (int)size.width + 12;//防止文本标签超出右边界而看不全 } } else { //将其设置到控件外部 annotation.text = ""; annotation.top = annotation.chart.height + 5; annotation.left = annotation.chart.width + 5; } } catch (exception ex) { annotation.text = ex.message; annotation.top = 5; annotation.left = 5; } } /// <summary> /// 计算某一点的y值坐标 /// </summary> /// <param name="series">曲线</param> /// <param name="xvalue">对应的x轴的值</param> /// <returns>计算得到的对应的y轴的值</returns> private double interpolatelineseries(steema.teechart.styles.series series, double xvalue) { try { int index; for (index = series.firstvisibleindex; index <= series.lastvisibleindex; index++) { if (index == -1 || series.xvalues.value[index] > xvalue) break; } // safeguard if (index < 1) { index = 1; } else if (index >= series.count) { index = series.count - 1; } // y=(y2-y1)/(x2-x1)*(x-x1)+y1 double dx = series.xvalues[index] - series.xvalues[index - 1]; double dy = series.yvalues[index] - series.yvalues[index - 1]; if (dx != 0.0) { return dy * (xvalue - series.xvalues[index - 1]) / dx + series.yvalues[index - 1]; } else { return 0.0; } } catch (exception ex) { console.writeline(ex.message); return 0.0; } }
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