如何解决生成下划线波形 itext7
如何在 :
之间绘制特定的下划线String s = "This text is underlined with a dashed line";
Paragraph paragraph = new Paragraph();
Text text;
for (int i = 0; i <s.length() ; i++) {
text = new Text(String.valueOf(s.charat(i)));
paragraph.add(text);
text.setNextRenderer(new DashedLineTextRenderer(text));
}
doc.add(paragraph);
doc.close();
private static class DashedLineTextRenderer extends TextRenderer {
public DashedLineTextRenderer(Text textElement) {
super(textElement);
}
// If renderer overflows on the next area,iText uses getNextRender() method to create a renderer for the overflow part.
// If getNextRenderer isn't overriden,the default method will be used and thus a default rather than custom
// renderer will be created
@Override
public IRenderer getNextRenderer() {
return new DashedLineTextRenderer((Text) modelElement);
}
@Override
public void draw(DrawContext drawContext) {
super.draw(drawContext);
Rectangle rect = this.getoccupiedAreaBBox();
PdfCanvas canvas = drawContext.getCanvas();
canvas.moveto(rect.getLeft(),rect.getBottom());
canvas.curveto(rect.getLeft()+100,rect.getBottom()+5,rect.getLeft()+150,rect.getBottom()-2,rect.getLeft()+200,rect.getBottom()-5);
canvas.stroke();
}
}
如果我使用单元素文本,它可以工作: enter image description here
如果有多个文本元素,我如何定义画布的位置
解决方法
问题未详细说明(请参阅澄清评论)。基本上是为了避免屏幕截图上的重叠:
您可以为 last_day(CREATED_AT::DATE,'week') as "LAST_DAY_OF_WEEK"
而不是 Paragraph
自定义渲染器:
Text
private static class WaveUnderlinedParagraphRenderer extends ParagraphRenderer {
public WaveUnderlinedParagraphRenderer(Paragraph paragraph) {
super(paragraph);
}
@Override
public void draw(DrawContext drawContext) {
super.draw(drawContext);
Rectangle rect = this.getOccupiedAreaBBox();
PdfCanvas canvas = drawContext.getCanvas();
canvas.moveTo(rect.getLeft(),rect.getBottom());
canvas.curveTo(rect.getLeft() + 100,rect.getBottom() + 5,rect.getLeft() + 150,rect.getBottom() - 2,rect.getLeft() + 200,rect.getBottom() - 5);
canvas.stroke();
}
@Override
public IRenderer getNextRenderer() {
return new WaveUnderlinedParagraphRenderer((Paragraph) modelElement);
}
}
得到如下结果:
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