fix(holiday): 折线图按标签精度绘制

xyc

昨天 bc822c6ca3e1ce3e16a38ba877449fc697be9511

 traffic-audit-server/src/test/java/com/trafficaudit/holiday/service/HolidayTrendChartServiceTest.java

@@ -5,7 +5,10 @@
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.math.BigDecimal;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -42,6 +45,40 @@
    }

    @Test
    void roundsLineDataToTheSamePrecisionAsLabels() {
        assertEquals(new BigDecimal("0.49"),
                HolidayTrendChartService.displayValue(new BigDecimal("0.4904"), false, 2));
        assertEquals(new BigDecimal("0.49"),
                HolidayTrendChartService.displayValue(new BigDecimal("0.4911"), false, 2));
        assertEquals(new BigDecimal("0.491"),
                HolidayTrendChartService.displayValue(new BigDecimal("0.4911"), false, 3));
        assertEquals(new BigDecimal("0.123"),
                HolidayTrendChartService.displayValue(new BigDecimal("0.1234"), true, 2));
    }

    @Test
    void rendersSameGeometryWhenValuesRoundToSameLabel() {
        HolidayTrendChartService service = new HolidayTrendChartService();
        HolidayTrendChartService.ChartSeries first = new HolidayTrendChartService.ChartSeries();
        first.setName("平均拥挤度");
        first.setValues(java.util.Arrays.asList(
                new BigDecimal("0.4904"), new BigDecimal("0.4923"), new BigDecimal("0.5100")));
        HolidayTrendChartService.ChartSeries second = new HolidayTrendChartService.ChartSeries();
        second.setName("平均拥挤度");
        second.setValues(java.util.Arrays.asList(
                new BigDecimal("0.4911"), new BigDecimal("0.4934"), new BigDecimal("0.5100")));

        byte[] firstChart = service.lineChart("拥挤度",
                java.util.Collections.singletonList(first), false, 2, 1100, 590);
        byte[] secondChart = service.lineChart("拥挤度",
                java.util.Collections.singletonList(second), false, 2, 1100, 590);

        assertPng(firstChart);
        assertPng(secondChart);
        assertArrayEquals(firstChart, secondChart);
    }

    @Test
    void rendersHigherPrecisionLineLabelsWhenRequested() {
        HolidayTrendChartService service = new HolidayTrendChartService();
        HolidayTrendChartService.ChartSeries congestion = new HolidayTrendChartService.ChartSeries();