draw_rect scaled to very small size

[gxlj]

Description of the bug

draw_rect behave different on existing page and new page

How to reproduce the bug

i have an existing pdf file and when i use draw_rect to draw on one of its page , eg , (100,100,600,600) , but it scaled to (20,20,200,200) , the rectangle is very small . even i set the width to more like 3000, it only can occupy 1/4 area of the whole page on left-top area .
but when create a new page , and draw on it , it works fine .

my question is , is there some possible reason that make draw_rect such behavior . actually not only draw_rect ,but also insert_text also this behavior . and i compared the new page and existing page , the transformation and other matrix are all same . i think the existing pdf page must have difference with new page , but i can't find it ...

PyMuPDF version

1.24.2

Operating system

MacOS

Python version

3.12

[JorjMcKie]

We can only accept a bug report complete with an example file. I also noticed that you do not use the current version.

[gxlj]

hi ,how to remove all CTM from the pdf page ? i saw some "cm" instruction left in existing page : (0.24,0,0,-0.24,0,840) and when i darw_rect it will mulitple that ctm with input rect.
or how to get the current CTM value from current page ? after get it , how to get a reverse one as the Morph ?

[JorjMcKie]

hi ,how to remove all CTM from the pdf page ? i saw some "cm" instruction left in existing page : (0.24,0,0,-0.24,0,840) and when i darw_rect it will mulitple that ctm with input rect. or how to get the current CTM value from current page ? after get it , how to get a reverse one as the Morph ?

This consideration will not resolve your problem. Please repeat using the current PyMuPDF version 1.24.3.

[gxlj]

i am using 1.24.4 to reproduce this .
i know the previous cm is (0.24,0,0,-0.24,0,0 )
how to pass the morph param to generate
"4.16,0,0,4.16,0,0 cm" (the inverse of above cm ) instruction ? (thus before draw , the two matrix multipy equal to 1)

from below code seems it depends the start point and a matrix , how to decide them ?

in shape.finish there is :

if pymupdf.CheckMorph(morph):
m1 = pymupdf.Matrix(
1, 0, 0, 1, morph[0].x + self.x, self.height - morph[0].y - self.y
)
mat = ~m1 * morph[1] * m1
self.draw_cont = _format_g(pymupdf.JM_TUPLE(mat)) + " cm\n" + self.draw_cont

[JorjMcKie]

First of all, this seems to be no bug report any longer.
I am therefore going to move this thread to the Discussions tab. We can pick up questions there.