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fix: preserve exports on close and support themed PDF without export quotas

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admin
2026-09-07 14:04:03 +08:00
parent 47c53b6f38
commit 9f097ea629
20 changed files with 485 additions and 123 deletions
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backend/app/plot/render_reportlab.py
+22 -13
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@@ -26,9 +26,12 @@ _TICK_FONT_SIZE = 10
_LABEL_FONT_SIZE = 12
def _build_drawing(geo: PlotGeometry) -> Drawing:
def _build_drawing(geo: PlotGeometry, palette=None) -> Drawing:
"""由共享几何构建矢量 Drawing（坐标翻转后仍沿用 SVG 的像素布局）。"""
drawing = Drawing(geo.width, geo.height)
grid_color = HexColor(palette['border']) if palette else _GRID_COLOR
axis_color = HexColor(palette['muted']) if palette else _AXIS_COLOR
label_color = HexColor(palette['text']) if palette else _LABEL_COLOR
# SVG y-down → reportlab y-up：翻转像素 y
def sx(x: float) -> float:
@@ -41,19 +44,19 @@ def _build_drawing(geo: PlotGeometry) -> Drawing:
if geo.grid:
for x in geo.xticks:
drawing.add(
Line(sx(x), sy(geo.ymin), sx(x), sy(geo.ymax), strokeColor=_GRID_COLOR, strokeWidth=0.5)
Line(sx(x), sy(geo.ymin), sx(x), sy(geo.ymax), strokeColor=grid_color, strokeWidth=0.5)
)
for y in geo.yticks:
drawing.add(
Line(sx(geo.xmin), sy(y), sx(geo.xmax), sy(y), strokeColor=_GRID_COLOR, strokeWidth=0.5)
Line(sx(geo.xmin), sy(y), sx(geo.xmax), sy(y), strokeColor=grid_color, strokeWidth=0.5)
)
# 坐标轴（过原点画在原点，否则贴边，与 SVG 一致）
drawing.add(
Line(sx(geo.xmin), sy(geo.x_axis_y), sx(geo.xmax), sy(geo.x_axis_y), strokeColor=_AXIS_COLOR, strokeWidth=0.7)
Line(sx(geo.xmin), sy(geo.x_axis_y), sx(geo.xmax), sy(geo.x_axis_y), strokeColor=axis_color, strokeWidth=0.7)
)
drawing.add(
Line(sx(geo.y_axis_x), sy(geo.ymin), sx(geo.y_axis_x), sy(geo.ymax), strokeColor=_AXIS_COLOR, strokeWidth=0.7)
Line(sx(geo.y_axis_x), sy(geo.ymin), sx(geo.y_axis_x), sy(geo.ymax), strokeColor=axis_color, strokeWidth=0.7)
)
# 刻度数字（x 轴下方、y 轴左侧）
@@ -61,14 +64,14 @@ def _build_drawing(geo: PlotGeometry) -> Drawing:
drawing.add(
String(
sx(x), sy(geo.x_axis_y) - 14, _fmt_num(x),
fontName=_FONT, fontSize=_TICK_FONT_SIZE, fillColor=_AXIS_COLOR, textAnchor="middle",
fontName=_FONT, fontSize=_TICK_FONT_SIZE, fillColor=axis_color, textAnchor="middle",
)
)
for y in geo.yticks:
drawing.add(
String(
sx(geo.y_axis_x) - 6, sy(y) - 3, _fmt_num(y),
fontName=_FONT, fontSize=_TICK_FONT_SIZE, fillColor=_AXIS_COLOR, textAnchor="end",
fontName=_FONT, fontSize=_TICK_FONT_SIZE, fillColor=axis_color, textAnchor="end",
)
)
@@ -83,7 +86,7 @@ def _build_drawing(geo: PlotGeometry) -> Drawing:
drawing.add(
String(
geo.width / 2, 10, geo.xlabel,
fontName=_FONT, fontSize=_LABEL_FONT_SIZE, fillColor=_LABEL_COLOR, textAnchor="middle",
fontName=_FONT, fontSize=_LABEL_FONT_SIZE, fillColor=label_color, textAnchor="middle",
)
)
if geo.ylabel:
@@ -95,7 +98,7 @@ def _build_drawing(geo: PlotGeometry) -> Drawing:
label.add(
String(
0, 0, geo.ylabel,
fontName=_FONT, fontSize=_LABEL_FONT_SIZE, fillColor=_LABEL_COLOR, textAnchor="middle",
fontName=_FONT, fontSize=_LABEL_FONT_SIZE, fillColor=label_color, textAnchor="middle",
)
)
label.translate(16, geo.height / 2)
@@ -105,19 +108,25 @@ def _build_drawing(geo: PlotGeometry) -> Drawing:
return drawing
def render_drawing(plot: FunctionPlot, width: float | None = None) -> Drawing:
def render_drawing(plot: FunctionPlot, width: float | None = None, palette=None, unlimited=False, max_height=None) -> Drawing:
"""把已解析的 FunctionPlot 渲染为 reportlab Drawing（可直接追加到 platypus story）。
``width`` 为目标输出宽度（点），用于把 640px 的几何缩放到页面内容宽；省略则按
原始尺寸输出。缩放只影响 PDF 渲染，不改动共享几何。
"""
geo = compute_geometry(plot)
drawing = _build_drawing(geo)
geo = compute_geometry(plot, unlimited=unlimited)
if palette:
from reportlab.lib.colors import HexColor as color
bg = color(palette['surface'])
if .2126*bg.red + .7152*bg.green + .0722*bg.blue < .5:
colors = ['#79c0ff','#ff9b9b','#7ee787','#d2a8ff','#f2cc60','#ffa657']
geo.colors = [value if plot.expressions[i].color else colors[i % len(colors)] for i,value in enumerate(geo.colors)]
drawing = _build_drawing(geo, palette)
legend_height = ((len(plot.expressions)+1)//2)*24
drawing.height += legend_height
for index, expression in enumerate(plot.expressions):
drawing.add(String(24+(index%2)*310,geo.height+legend_height-18-(index//2)*24,
expression.label or 'y = '+expression.expression,fontName=_FONT,fontSize=12,fillColor=HexColor(geo.colors[index])))
if width is not None and width > 0:
drawing.renderScale = min(1.0, width / geo.width)
drawing.renderScale = min(1.0, width / geo.width, max_height / drawing.height if max_height else 1.0)
return drawing