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Draw Tool: Click to add points. Double-click or press C to close shape.
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Measurement: Hover a segment, press M to input length, then Enter.
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Text Tool: Click to add text. Click existing text to drag it. Double Click to Edit it
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Close: Ends current drawing and closes shape.
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Clear: Deletes all shapes and texts.
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Export PDF: Saves as A4 PDF with white background.
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Esc: Cancel current action or close help.
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H or ❔: Show this help menu.