Jasper reports 图像作为iReport图表中的类别标签
我正在尝试创建一个带有类别标签(x轴标签)图像的条形图。对于默认条形图,类别表达式的结果用作标签(并且必须是字符串)。我如何自定义它以显示图像?我已经编写了一个scriptlet来用BuffereImage填充变量,现在我只需要一种使用它们的方法。我可以用图表定制器类来实现这一点吗?有更简单/更好的方法吗?正如您所说,您可以通过自己的customizer类来实现这一点。以下是一个简单的示例,可根据您的需要进行增强:Jasper reports 图像作为iReport图表中的类别标签,jasper-reports,jfreechart,Jasper Reports,Jfreechart,我正在尝试创建一个带有类别标签(x轴标签)图像的条形图。对于默认条形图,类别表达式的结果用作标签(并且必须是字符串)。我如何自定义它以显示图像?我已经编写了一个scriptlet来用BuffereImage填充变量,现在我只需要一种使用它们的方法。我可以用图表定制器类来实现这一点吗?有更简单/更好的方法吗?正如您所说,您可以通过自己的customizer类来实现这一点。以下是一个简单的示例,可根据您的需要进行增强: @Slf4j public class CategoryAxisWithIma
@Slf4j
public class CategoryAxisWithImagesCustomizer extends JRAbstractChartCustomizer {
public class CategoryAxisWithImages extends CategoryAxis {
public CategoryAxisWithImages(String label) {
super(label);
}
@Override
protected Rectangle2D getLabelEnclosure(Graphics2D g2, RectangleEdge edge) {
// enter max width and height of your images or you can do it dynamically
return new Rectangle2D.Double(0, 0, 32, 32);
}
@Override
protected AxisState drawCategoryLabels(Graphics2D g2, Rectangle2D plotArea, Rectangle2D dataArea, RectangleEdge edge, AxisState state, PlotRenderingInfo plotState) {
if (!isTickLabelsVisible()) {
return state;
}
List ticks = refreshTicks(g2, state, plotArea, edge);
state.setTicks(ticks);
for (int i = 0; i < ticks.size(); i++) {
double x = getCategoryMiddle(i, ticks.size(), dataArea, edge);
double y = state.getCursor() + getCategoryLabelPositionOffset();
int value = (int) ((CategoryPlot) getPlot()).getDataset().getColumnKey(i);
String imagePath = "logo_" + value + ".png";
try {
InputStream imageStream = getClass().getResourceAsStream(imagePath);
// you can of course load images using different way - here I'm using index value from the dataset
BufferedImage image = ImageIO.read(imageStream);
g2.drawImage(image, (int) (x - image.getWidth() / 2d), (int) (y), image.getWidth(), image.getHeight(), Color.black, null);
} catch (IOException e) {
log.error("Cannot load image {}", imagePath);
}
}
state.cursorDown(state.getMax() + getCategoryLabelPositionOffset());
return state;
}
}
@Override
public void customize(JFreeChart chart, JRChart jasperChart) {
CategoryPlot plot = chart.getCategoryPlot();
CategoryAxis categoryAxis = new CategoryAxisWithImages(plot.getDomainAxis().getLabel());
plot.setDomainAxis(categoryAxis);
}
}
@Slf4j
带有ImagesCustomizer的公共类CategoryAxis扩展了JRactChartCustomizer{
带有图像的公共类CategoryAxis扩展了CategoryAxis{
公共类别AxisWithImages(字符串标签){
超级(标签);
}
@凌驾
受保护的矩形2D GetLabelnClosure(图形2D g2,矩形边){
//输入图像的最大宽度和高度,也可以动态输入
返回新的矩形2d.Double(0,0,32,32);
}
@凌驾
受保护的AxisState绘图类别标签(Graphics2D g2、矩形2D绘图区、矩形2D数据区、矩形边缘、AxisState状态、绘图渲染信息绘图状态){
如果(!isTickLabelsVisible()){
返回状态;
}
列表标记=刷新标记(g2、状态、绘图区域、边缘);
state.setTicks(ticks);
对于(int i=0;i
在JasperReport JRXML中,您可以像这样注册该定制器类:
<barChart>
<chart customizerClass="cz.trask.experiment.jr.CategoryAxisWithImagesCustomizer"
isShowLegend="false">
<reportElement x="0" y="0" width="550" height="348" uuid="a2cbb6b5-a76d-469b-8e8e-daa533260f20"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
...
</barChart>
...
我的例子的结果是:
正如您所说,您可以通过自己的customizer类来实现这一点。以下是一个简单的示例,可根据您的需要进行增强:
@Slf4j
public class CategoryAxisWithImagesCustomizer extends JRAbstractChartCustomizer {
public class CategoryAxisWithImages extends CategoryAxis {
public CategoryAxisWithImages(String label) {
super(label);
}
@Override
protected Rectangle2D getLabelEnclosure(Graphics2D g2, RectangleEdge edge) {
// enter max width and height of your images or you can do it dynamically
return new Rectangle2D.Double(0, 0, 32, 32);
}
@Override
protected AxisState drawCategoryLabels(Graphics2D g2, Rectangle2D plotArea, Rectangle2D dataArea, RectangleEdge edge, AxisState state, PlotRenderingInfo plotState) {
if (!isTickLabelsVisible()) {
return state;
}
List ticks = refreshTicks(g2, state, plotArea, edge);
state.setTicks(ticks);
for (int i = 0; i < ticks.size(); i++) {
double x = getCategoryMiddle(i, ticks.size(), dataArea, edge);
double y = state.getCursor() + getCategoryLabelPositionOffset();
int value = (int) ((CategoryPlot) getPlot()).getDataset().getColumnKey(i);
String imagePath = "logo_" + value + ".png";
try {
InputStream imageStream = getClass().getResourceAsStream(imagePath);
// you can of course load images using different way - here I'm using index value from the dataset
BufferedImage image = ImageIO.read(imageStream);
g2.drawImage(image, (int) (x - image.getWidth() / 2d), (int) (y), image.getWidth(), image.getHeight(), Color.black, null);
} catch (IOException e) {
log.error("Cannot load image {}", imagePath);
}
}
state.cursorDown(state.getMax() + getCategoryLabelPositionOffset());
return state;
}
}
@Override
public void customize(JFreeChart chart, JRChart jasperChart) {
CategoryPlot plot = chart.getCategoryPlot();
CategoryAxis categoryAxis = new CategoryAxisWithImages(plot.getDomainAxis().getLabel());
plot.setDomainAxis(categoryAxis);
}
}
@Slf4j
带有ImagesCustomizer的公共类CategoryAxis扩展了JRactChartCustomizer{
带有图像的公共类CategoryAxis扩展了CategoryAxis{
公共类别AxisWithImages(字符串标签){
超级(标签);
}
@凌驾
受保护的矩形2D GetLabelnClosure(图形2D g2,矩形边){
//输入图像的最大宽度和高度,也可以动态输入
返回新的矩形2d.Double(0,0,32,32);
}
@凌驾
受保护的AxisState绘图类别标签(Graphics2D g2、矩形2D绘图区、矩形2D数据区、矩形边缘、AxisState状态、绘图渲染信息绘图状态){
如果(!isTickLabelsVisible()){
返回状态;
}
列表标记=刷新标记(g2、状态、绘图区域、边缘);
state.setTicks(ticks);
对于(int i=0;i
在JasperReport JRXML中,您可以像这样注册该定制器类:
<barChart>
<chart customizerClass="cz.trask.experiment.jr.CategoryAxisWithImagesCustomizer"
isShowLegend="false">
<reportElement x="0" y="0" width="550" height="348" uuid="a2cbb6b5-a76d-469b-8e8e-daa533260f20"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
...
</barChart>
...
我的例子的结果是:
好的,这看起来真的很好,非常感谢!我的最后一个任务是从customizer类中访问图像文件。我可以通过列键这样做,但是有没有一种方法可以通过getParameterValue()访问变量?我一直想这样做,但也许这会带来更多的麻烦。是的,你可以