void GraphWidget::drawChart() { XYChart *c = new XYChart(size.width(), size.height() - 100, Chart::Transparent); c->setPlotArea(10, 50, c->getWidth() - 65, c->getHeight() - 10, 0x000000, -1, 0xC8C8C8, Chart::Transparent, Chart::Transparent); c->setClipping(); c->getLegend()->setLineStyleKey(); c->getLegend()->setFontSize(10); //遍历查询结果并绘制结果 int ea_result_count = ea_results.size(); //设置X轴的label for(int i = 0;i < ea_result_count;i++){ ExchangeRateResult *ea_result = ea_results[i]; DoubleArray x_data = getXData(i); DoubleArray y_data = ea_result->getYData(); double viewPortStartDate = m_ChartViewer->getValueAtViewPort("x", m_ChartViewer->getViewPortLeft()); double viewPortEndDate = m_ChartViewer->getValueAtViewPort("x", m_ChartViewer->getViewPortLeft() + m_ChartViewer->getViewPortWidth()); int startIndex = (int)floor(Chart::bSearch(x_data, viewPortStartDate)); int endIndex = (int)ceil(Chart::bSearch(x_data, viewPortEndDate)); int noOfPoints = endIndex - startIndex + 1; DoubleArray viewPortXData = DoubleArray(x_data.data + startIndex, noOfPoints); DoubleArray viewPortYData = DoubleArray(y_data.data + startIndex, noOfPoints); //添加图层 LineLayer *layer = c->addLineLayer(); layer->setLineWidth(1); //设置X轴 layer->setXData(viewPortXData); //设置Y轴 layer->addDataSet(viewPortYData, ea_result->getColor(), ea_result->getName().toUtf8().data())->setUseYAxis2(); } c->xAxis()->setLabelStyle("arial.ttf", 10); c->yAxis2()->setLabelStyle("arial.ttf", 10); c->xAxis()->setColors(0xC8C8C8, 0xC8C8C8); c->yAxis2()->setColors(0xC8C8C8, 0xC8C8C8); m_ChartViewer->syncDateAxisWithViewPort("x", c->xAxis()); c->yAxis()->setTickDensity(30); c->yAxis2()->setTickDensity(30); if (!m_ChartViewer->isInMouseMoveEvent()) { trackLineLegend(c, (0 == m_ChartViewer->getChart()) ? c->getPlotArea()->getRightX() : m_ChartViewer->getPlotAreaMouseX()); } delete m_ChartViewer->getChart(); m_ChartViewer->setChart(c); }
int main(int argc, char *argv[]) { // The x and y coordinates of the grid double dataX[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; double dataY[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; // Use random numbers for the z values on the XY grid RanSeries *r = new RanSeries(999); DoubleArray dataZ = r->get2DSeries((int)(sizeof(dataX) / sizeof(dataX[0])), (int)(sizeof(dataY) / sizeof(dataY[0])), -0.9, 1.15); // Create a XYChart object of size 640 x 460 pixels XYChart *c = new XYChart(640, 460); // Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey // (0xdd000000) horizontal and vertical grid lines c->setPlotArea(50, 25, 400, 400, -1, -1, Chart::Transparent, 0xdd000000, -1); // Set the x and y axis stems to transparent and the label font to 12pt Arial c->xAxis()->setColors(Chart::Transparent); c->yAxis()->setColors(Chart::Transparent); c->xAxis()->setLabelStyle("arial.ttf", 12); c->yAxis()->setLabelStyle("arial.ttf", 12); // Set the x-axis and y-axis scale c->xAxis()->setLinearScale(0, 10, 1); c->yAxis()->setLinearScale(0, 10, 1); // Add a contour layer using the given data ContourLayer *layer = c->addContourLayer(DoubleArray(dataX, (int)(sizeof(dataX) / sizeof(dataX[0 ]))), DoubleArray(dataY, (int)(sizeof(dataY) / sizeof(dataY[0]))), dataZ); // Move the grid lines in front of the contour layer c->getPlotArea()->moveGridBefore(layer); // Define the color scale double colorScale[] = {-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4, 0x00ff00, 0.7, 0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1}; // Apply the color scale, and specify the underflow and overflow colors for regions exceeding // the color scale layer->colorAxis()->setColorScale(DoubleArray(colorScale, (int)(sizeof(colorScale) / sizeof( colorScale[0]))), 0x0000cc, 0x000000); // // Instead of displaying the color axis, we use a legend box to display the colors. This is // useful for colors that are unevenly spaced on the color axis. // // Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent // background and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels. LegendBox *b = c->addLegend(460, 25, true, "arial.ttf", 12); b->setBackground(Chart::Transparent, Chart::Transparent); b->setKeySize(15, 15); b->setKeySpacing(0, 8); // Add the legend box entries b->addKey("> 1.1 (Critical)", 0x000000); b->addKey("1.0 to 1.1 (Alert)", 0xcc0000); b->addKey("0.9 to 1.0", 0xff6600); b->addKey("0.7 to 0.9", 0xffff00); b->addKey("0.4 to 0.7", 0x00ff00); b->addKey("0.0 to 0.4", 0x88ff88); b->addKey("-0.3 to 0.0", 0x66ffff); b->addKey("-0.5 to -0.3", 0x66ccff); b->addKey("-0.8 to -0.5", 0x0066ff); b->addKey("< -0.8", 0x0000cc); // Output the chart c->makeChart("contourlegend.png"); //free up resources delete r; delete c; return 0; }