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Running on Zero
Running on Zero
| """A printable A4 poster with a QR code that opens the bot (for dorm walls, class boards, cafeterias). | |
| Latin text only (standard PDF fonts), so it needs no font files.""" | |
| import io | |
| from reportlab.graphics import renderPDF | |
| from reportlab.graphics.barcode.qr import QrCodeWidget | |
| from reportlab.graphics.shapes import Drawing | |
| from reportlab.lib.pagesizes import A4 | |
| from reportlab.pdfgen import canvas | |
| BLUE = (0.10, 0.30, 0.60) | |
| def make_poster_pdf(link: str, bot_username: str, channel_url: str, headline: str = "DBU Freshman Central") -> bytes: | |
| w, h = A4 | |
| buf = io.BytesIO() | |
| c = canvas.Canvas(buf, pagesize=A4) | |
| c.setTitle(headline) | |
| c.setFillColorRGB(*BLUE) | |
| c.rect(0, h - 190, w, 190, stroke=0, fill=1) # header band | |
| c.setFillColorRGB(1, 1, 1) | |
| c.setFont("Helvetica-Bold", 40) | |
| c.drawCentredString(w / 2, h - 95, headline) | |
| c.setFont("Helvetica", 18) | |
| c.drawCentredString(w / 2, h - 135, "Debre Berhan University") | |
| c.setFillColorRGB(0.1, 0.1, 0.1) | |
| c.setFont("Helvetica-Bold", 28) | |
| c.drawCentredString(w / 2, h - 255, "Free study materials, one tap away") | |
| c.setFont("Helvetica", 20) | |
| for i, line in enumerate(("Lecture slides", "Past exams", "Course modules", "Weekly student ranking")): | |
| c.drawCentredString(w / 2, h - 300 - i * 28, "- " + line + " -") | |
| qr = QrCodeWidget(link) | |
| x0, y0, x1, y1 = qr.getBounds() | |
| size = 235 | |
| drawing = Drawing(size, size, transform=[size / (x1 - x0), 0, 0, size / (y1 - y0), 0, 0]) | |
| drawing.add(qr) | |
| qx, qy = (w - size) / 2, 185 | |
| c.setFillColorRGB(1, 1, 1) | |
| c.setStrokeColorRGB(*BLUE) | |
| c.setLineWidth(3) | |
| c.roundRect(qx - 16, qy - 16, size + 32, size + 32, 14, stroke=1, fill=1) | |
| renderPDF.draw(drawing, c, qx, qy) | |
| c.setFillColorRGB(*BLUE) | |
| c.setFont("Helvetica-Bold", 24) | |
| c.drawCentredString(w / 2, 128, "Scan with your phone camera") | |
| c.setFont("Helvetica", 18) | |
| c.drawCentredString(w / 2, 98, f"or search @{bot_username} on Telegram") | |
| c.setFont("Helvetica", 14) | |
| c.drawCentredString(w / 2, 56, channel_url.replace("https://", "")) | |
| c.showPage() | |
| c.save() | |
| return buf.getvalue() | |