Question

我想在放置在pdf中的图像上创建3D阴影效果。我正在使用itextpdf。问题类似于： Adding shadow effect on iText elements

但有图像而不是文字。我的图像放在表格单元格中。只要表没有完成，就无法获得图像的实际大小及其在页面中的坐标，这使得它变得棘手。任何精彩的身份？感谢致敬，西尔

Answer 1

4小时后，我找到了一种方法，使用PdfCellEvent并在单元格的填充内绘制我需要的内容。

static class ShadowRectangle implements PdfPCellEvent {
        public void cellLayout(PdfPCell cell, Rectangle rect,
                               PdfContentByte[] canvas) {
            PdfContentByte lCb = canvas[PdfPTable.LINECANVAS];

            // Paddings for the border
        int paddingHorizontal = 8;
        int paddingVertical = 8;

        // Width of the shadow
        int shadowwidth = 7;

        // Calculate border location and size
        float left = rect.getLeft() + paddingHorizontal;
        float bottom = rect.getBottom() + paddingVertical;
        float width = rect.getWidth() - 2 * paddingHorizontal;
        float height = rect.getHeight() - 2 * paddingVertical;


        lCb.saveState();
        lCb.setColorFill(BaseColor.GRAY);
        // Draw the shadow at the bottom
        lCb.rectangle(left + shadowwidth, bottom - shadowwidth, width, shadowwidth);
        lCb.fill();
        // Draw the shadow at the right
        lCb.rectangle(left + width, bottom - shadowwidth, shadowwidth, height);
        lCb.fill();

        //lCb.setColorStroke(BaseColor.RED);
        // Draw the border
        //lCb.rectangle(left, bottom, width, height);

        lCb.stroke();
        lCb.restoreState();
    }
}

//我以这种方式填写PdfPTable

PdfPTable lImages = new PdfPTable(NB_PICTURE_PER_ROW);
lImages.getDefaultCell().setBorder(Rectangle.NO_BORDER);

// ...循环

lImageBoucle = Image.getInstance(lFile.getCanonicalPath() + File.separator + lTabPhotos[i]);
                PdfPCell lCell = new  PdfPCell();
                lCell.setImage(lImageBoucle);
                lCell.setBorder(Rectangle.NO_BORDER);
                lCell.setPadding(8);

                PdfPCellEvent lShadowRectangle = new ShadowRectangle();
                lCell.setCellEvent(lShadowRectangle);
                lImages.addCell(lCell);

使用itextpdf在图像上创建3D阴影效果

1 个答案: