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import math
from fpdf import FPDF
from fpdf.drawing_primitives import Transform
from pathlib import Path
from test.conftest import assert_pdf_equal
HERE = Path(__file__).resolve().parent
def test_transform_isolation(tmp_path):
"""
Verifies that the transformation is strictly isolated to the 'with' block
and does not leak to subsequent drawings.
"""
pdf = FPDF()
pdf.add_page()
pdf.set_font("Helvetica", size=10)
w, h = 30, 20
y_pos = 50
pdf.set_draw_color(0, 0, 0) # Black
pdf.set_line_width(0.5)
pdf.text(20, y_pos - 5, "1. Before (Normal)")
pdf.rect(20, y_pos, w, h)
x_center = 80
cx, cy = x_center + w / 2, y_pos + h / 2
t_complex = (
Transform.translation(cx, cy)
@ Transform.rotation(math.radians(20))
@ Transform.shearing(x=math.radians(10), y=0)
@ Transform.translation(-cx, -cy)
)
pdf.set_draw_color(220, 50, 50) # Red
with pdf.transform(t_complex):
pdf.text(x_center, y_pos - 5, "2. Inside (Transformed)")
pdf.rect(x_center, y_pos, w, h)
pdf.set_draw_color(0, 0, 0)
x_right = 140
pdf.text(x_right, y_pos - 5, "3. After (Normal)")
pdf.rect(x_right, y_pos, w, h)
assert_pdf_equal(pdf, HERE / "transform.pdf", tmp_path)
def test_transform_tilted_title(tmp_path):
pdf = FPDF()
pdf.add_page()
pdf.set_font("Helvetica", size=12)
pdf.text(20, 20, "Normal title")
pdf.set_draw_color(200, 200, 200)
pdf.set_line_width(0.2)
pdf.line(15, 30, 180, 30)
title_anchor_x, title_anchor_y = 90, 30
title_transform = Transform.rotation_d(12).about(title_anchor_x, title_anchor_y)
with pdf.transform(title_transform):
pdf.set_font("Times", style="B", size=20)
pdf.set_text_color(30, 30, 120)
pdf.text(60, 30, "Tilted Title")
pdf.set_text_color(0, 0, 0)
pdf.set_font("Helvetica", size=9)
pdf.text(20, 45, "Baseline at y=30")
assert_pdf_equal(pdf, HERE / "transform_title.pdf", tmp_path)
def test_transform_mirrored_text(tmp_path):
pdf = FPDF()
pdf.add_page()
pdf.set_font("Helvetica", size=11)
pdf.text(20, 50, "Left block")
lines = ["Mirror me", "Line two", "Line three"]
y_pos = 60
for line in lines:
pdf.text(20, y_pos, line)
y_pos += 6
axis_x = 105
pdf.set_draw_color(160, 0, 0)
pdf.set_line_width(0.2)
pdf.line(axis_x, 40, axis_x, 110)
pdf.set_text_color(120, 0, 0)
pdf.text(axis_x + 2, 45, "mirror axis")
mirror = Transform.scaling(-1, 1).about(axis_x, 0)
with pdf.transform(mirror):
pdf.set_text_color(0, 0, 120)
pdf.text(20, 50, "Right block (mirrored)")
y_pos = 60
for line in lines:
pdf.text(20, y_pos, line)
y_pos += 6
pdf.set_text_color(0, 0, 0)
assert_pdf_equal(pdf, HERE / "transform_mirror.pdf", tmp_path)
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