IText Pdf生成中的矩形重叠

Question

i tried to create rectangles as in the image, when i tried to create rectangles using coordinates the two rectangles are placing one after other.

Here is the code how iam creating Rectangle.

when i give coordinates for two rectangles those are generating one after other, i want them to overlap as in the image..How can i make it?

                PdfWriter writer= PdfWriter.getInstance(document, new FileOutputStream(filename));
                document.open();

                PdfContentByte cb = writer.getDirectContent();
                Rectangle rect,rect1;
                rect = new Rectangle(p1,p2,p3,p4); // CO-ORDINATES OF RECTANGLE
                rect.setBorder(Rectangle.BOX);
                cb.rectangle(rect);

Answer 1

Please take a look at the Rectangles example to find out how to create a PDF that looks like rectangles.pdf :

When creating a rectangle, you need the coordinates of the lower-left corner and the upper-right corner of the rectangle. For instance:

float llx = 36;
float lly = 700;
float urx = 200;
float ury = 806;

You already know that you need a PdfContentByte instance to draw the first rectangle:

PdfContentByte canvas = writer.getDirectContent();
Rectangle rect1 = new Rectangle(llx, lly, urx, ury);
rect1.setBackgroundColor(BaseColor.LIGHT_GRAY);
rect1.setBorder(Rectangle.BOX);
rect1.setBorderWidth(1);
canvas.rectangle(rect1);

For clarity, I have defined a background color and I've set the border width to 1 pt.

Now when you want to add an extra rectangle that overlaps the same way as described in your question, you need to change the llx and ury value. That's elementary math. For instance:

Rectangle rect2 = new Rectangle(llx + 60, lly, urx, ury - 40);
rect2.setBackgroundColor(BaseColor.DARK_GRAY);
rect2.setBorder(Rectangle.BOX);
rect2.setBorderColor(BaseColor.WHITE);
rect2.setBorderWidth(0.5f);
canvas.rectangle(rect2);

To make sure you see the difference, I've now used another background color, and I defined 0.5 pt as the border width and white as the border color.

It doesn't get any simpler than this.