// // Draw track line with axis labels // void TrackAxis::trackLineAxis(XYChart *c, int mouseX) { // Clear the current dynamic layer and get the DrawArea object to draw on it. DrawArea *d = c->initDynamicLayer(); // The plot area object PlotArea *plotArea = c->getPlotArea(); // Get the data x-value that is nearest to the mouse, and find its pixel coordinate. double xValue = c->getNearestXValue(mouseX); int xCoor = c->getXCoor(xValue); // The vertical track line is drawn up to the highest data point (the point with smallest // y-coordinate). We need to iterate all datasets in all layers to determine where it is. int minY = plotArea->getBottomY(); // Iterate through all layers to find the highest data point for(int i = 0; i < c->getLayerCount(); ++i) { Layer *layer = c->getLayerByZ(i); // The data array index of the x-value int xIndex = layer->getXIndexOf(xValue); // Iterate through all the data sets in the layer for(int j = 0; j < layer->getDataSetCount(); ++j) { DataSet *dataSet = layer->getDataSetByZ(j); double dataPoint = dataSet->getPosition(xIndex); if ((dataPoint != Chart::NoValue) && (dataSet->getDataColor() != (int)Chart::Transparent)) minY = min(minY, c->getYCoor(dataPoint, dataSet->getUseYAxis())); } } // Draw a vertical track line at the x-position up to the highest data point. d->vline(max(minY, plotArea->getTopY()), plotArea->getBottomY() + 6, xCoor, d->dashLineColor( 0x000000, 0x0101)); // Draw a label on the x-axis to show the track line position ostringstream xlabel; xlabel << "<*font,bgColor=000000*> " << c->xAxis()->getFormattedLabel(xValue, "mmm dd, yyyy") << " <*/font*>"; TTFText *t = d->text(xlabel.str().c_str(), "arialbd.ttf", 8); t->draw(xCoor, plotArea->getBottomY() + 6, 0xffffff, Chart::Top); t->destroy(); // Iterate through all layers to build the legend array for(int i = 0; i < c->getLayerCount(); ++i) { Layer *layer = c->getLayerByZ(i); // The data array index of the x-value int xIndex = layer->getXIndexOf(xValue); // Iterate through all the data sets in the layer for(int j = 0; j < layer->getDataSetCount(); ++j) { DataSet *dataSet = layer->getDataSetByZ(j); // The positional value, axis binding, pixel coordinate and color of the data point. double dataPoint = dataSet->getPosition(xIndex); Axis *yAxis = dataSet->getUseYAxis(); int yCoor = c->getYCoor(dataPoint, yAxis); int color = dataSet->getDataColor(); // Draw the axis label only for visible data points of named data sets if ((dataPoint != Chart::NoValue) && (color != (int)Chart::Transparent) && (yCoor >= plotArea->getTopY()) && (yCoor <= plotArea->getBottomY())) { // The axis label consists of 3 parts - a track dot for the data point, an axis label, // and a line joining the track dot to the axis label. // Draw the line first. The end point of the line at the axis label side depends on // whether the label is at the left or right side of the axis (that is, on whether the // axis is on the left or right side of the plot area). int xPos = yAxis->getX() + ((yAxis->getAlignment() == Chart::Left) ? -4 : 4); d->hline(xCoor, xPos, yCoor, d->dashLineColor(color, 0x0101)); // Draw the track dot d->circle(xCoor, yCoor, 4, 4, color, color); // Draw the axis label. If the axis is on the left side of the plot area, the labels // should right aligned to the axis, and vice versa. ostringstream axisLabel; axisLabel << "<*font,bgColor=" << hex << color << "*> " << c->formatValue(dataPoint, "{value|P4}") << " <*/font*>"; t = d->text(axisLabel.str().c_str(), "arialbd.ttf", 8); t->draw(xPos, yCoor, 0xffffff, ((yAxis->getAlignment() == Chart::Left) ? Chart::Right : Chart::Left)); t->destroy(); } } } }
// // Draw track line with data labels // void ZoomScrollTrack2::trackLineLabel(XYChart *c, int mouseX) { // Clear the current dynamic layer and get the DrawArea object to draw on it. DrawArea *d = c->initDynamicLayer(); // The plot area object PlotArea *plotArea = c->getPlotArea(); // Get the data x-value that is nearest to the mouse, and find its pixel coordinate. double xValue = c->getNearestXValue(mouseX); int xCoor = c->getXCoor(xValue); // Draw a vertical track line at the x-position d->vline(plotArea->getTopY(), plotArea->getBottomY(), xCoor, d->dashLineColor(0x000000, 0x0101)); // Draw a label on the x-axis to show the track line position. ostringstream xlabel; xlabel << "<*font,bgColor=000000*> " << c->xAxis()->getFormattedLabel(xValue, "mmm dd, yyyy") << " <*/font*>"; TTFText *t = d->text(xlabel.str().c_str(), "arialbd.ttf", 8); // Restrict the x-pixel position of the label to make sure it stays inside the chart image. int xLabelPos = max(0, min(xCoor - t->getWidth() / 2, c->getWidth() - t->getWidth())); t->draw(xLabelPos, plotArea->getBottomY() + 6, 0xffffff); t->destroy(); // Iterate through all layers to draw the data labels for (int i = 0; i < c->getLayerCount(); ++i) { Layer *layer = c->getLayerByZ(i); // The data array index of the x-value int xIndex = layer->getXIndexOf(xValue); // Iterate through all the data sets in the layer for (int j = 0; j < layer->getDataSetCount(); ++j) { DataSet *dataSet = layer->getDataSetByZ(j); const char *dataSetName = dataSet->getDataName(); // Get the color, name and position of the data label int color = dataSet->getDataColor(); int yCoor = c->getYCoor(dataSet->getPosition(xIndex), dataSet->getUseYAxis()); // Draw a track dot with a label next to it for visible data points in the plot area if ((yCoor >= plotArea->getTopY()) && (yCoor <= plotArea->getBottomY()) && (color != (int)Chart::Transparent) && dataSetName && *dataSetName) { d->circle(xCoor, yCoor, 4, 4, color, color); ostringstream label; label << "<*font,bgColor=" << hex << color << "*> " << c->formatValue(dataSet->getValue(xIndex), "{value|P4}") << " <*font*>"; t = d->text(label.str().c_str(), "arialbd.ttf", 8); // Draw the label on the right side of the dot if the mouse is on the left side the // chart, and vice versa. This ensures the label will not go outside the chart image. if (xCoor <= (plotArea->getLeftX() + plotArea->getRightX()) / 2) t->draw(xCoor + 5, yCoor, 0xffffff, Chart::Left); else t->draw(xCoor - 5, yCoor, 0xffffff, Chart::Right); t->destroy(); } } } }
void GraphWidget::trackLineLegend(XYChart *c, int mouseX) { //清空值 nameList.clear(); valueList.clear(); colorList.clear(); DrawArea *d = c->initDynamicLayer(); // The plot area object PlotArea *plotArea = c->getPlotArea(); // Get the data x-value that is nearest to the mouse, and find its pixel coordinate. double xValue = c->getNearestXValue(mouseX); int xCoor = c->getXCoor(xValue); // Draw a vertical track line at the x-position d->vline(plotArea->getTopY(), plotArea->getBottomY(), xCoor, d->dashLineColor(0xffffff, 0x0101)); // Container to hold the legend entries vector<string> legendEntries; // Iterate through all layers to build the legend array for (int i = 0; i < c->getLayerCount(); ++i) { Layer *layer = c->getLayerByZ(i); // The data array index of the x-value int xIndex = layer->getXIndexOf(xValue); // Iterate through all the data sets in the layer for (int j = 0; j < layer->getDataSetCount(); ++j) { DataSet *dataSet = layer->getDataSetByZ(j); // We are only interested in visible data sets with names const char *dataName = dataSet->getDataName(); //添加类别信息 nameList << QString::fromUtf8(dataName); //添加颜色信息 colorList << dataSet->getDataColor(); int color = dataSet->getDataColor(); if (dataName && *dataName && (color != (int)Chart::Transparent)) { // Build the legend entry, consist of the legend icon, name and data value. double dataValue = dataSet->getValue(xIndex); //添加值信息 if(dataValue == Chart::NoValue){ bool isFind = false; for(int temp_i = xValue - 1;temp_i >= 0;temp_i--){ int index = layer->getXIndexOf(temp_i); if(index != -1){ isFind = true; double value = dataSet->getValue(index); valueList << QString::fromUtf8(c->formatValue(value, "{value|P4}")); break; } } if(!isFind){ valueList << "N/A"; } }else{ valueList << QString::fromUtf8(c->formatValue(dataValue, "{value|P4}")); } ostringstream legendEntry; legendEntry << "<*block*><*font=msyhbd.ttf*>" << dataSet->getLegendIcon() << " " << dataName << ": " << ((dataValue == Chart::NoValue) ? "N/A" : c->formatValue(dataValue, "{value|P4}")) << "<*/*>"; legendEntries.push_back(legendEntry.str()); // Draw a track dot for data points within the plot area int yCoor = c->getYCoor(dataSet->getPosition(xIndex), dataSet->getUseYAxis()); if ((yCoor >= plotArea->getTopY()) && (yCoor <= plotArea->getBottomY())) { d->circle(xCoor, yCoor, 4, 4, color, color); } } } } //添加值信息 valueList << QString::fromUtf8(c->xAxis()->getFormattedLabel(getXValue((int)xValue), "yyyy-mm-dd hh:nn")); // Create the legend by joining the legend entries ostringstream legendText; legendText << "<*block,maxWidth=" << plotArea->getWidth() << "*><*block*><*font=arialbd.ttf*>[" << c->xAxis()->getFormattedLabel(getXValue((int)xValue), "yyyy-mm-dd hh:nn") << "]<*/*>"; for (int i = ((int)legendEntries.size()) - 1; i >= 0; --i) legendText << " " << legendEntries[i]; // Display the legend on the top of the plot area TTFText *t = d->text(legendText.str().c_str(), "arial.ttf", 8); t->draw(plotArea->getLeftX() + 5, plotArea->getTopY() - 3, 0xC8C8C8, Chart::BottomLeft); t->destroy(); //y轴显示值 if(!isValueHide){ trackLineAxis(c, d, mouseX); } }