reugenio
3826cbaed4
Major features added since v0.5: - PNG support with alpha/transparency (soft masks) - FlateDecode compression via libdeflate-zig - Bookmarks/Outline for document navigation - Bezier curves, circles, ellipses, arcs - Transformations (rotate, scale, translate, skew) - Transparency/opacity (fill and stroke alpha) - Linear and radial gradients (Shading Patterns) - Code128 (1D) and QR Code (2D) barcodes - TrueType font parsing (metrics, glyph widths) - RC4 encryption module (40/128-bit) - AcroForms module (TextField, CheckBox) - SVG import (basic shapes and paths) - Template system (reusable layouts) - Markdown styling (bold, italic, links, headings, lists) Documentation: - README.md: Complete API reference with code examples - FUTURE_IMPROVEMENTS.md: Detailed roadmap for future development - CLAUDE.md: Updated to v1.0 release status Stats: - 125+ unit tests passing - 16 demo examples - 46 source files 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
247 lines
8.8 KiB
Zig
247 lines
8.8 KiB
Zig
//! Curves Demo - Bezier Curves, Circles, Ellipses, and Arcs
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//!
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//! Demonstrates the curve drawing capabilities of zpdf including:
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//! - Cubic and quadratic Bezier curves
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//! - Circles and ellipses
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//! - Arcs
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const std = @import("std");
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const pdf = @import("zpdf");
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const allocator = gpa.allocator();
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std.debug.print("zpdf - Curves Demo\n", .{});
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var doc = pdf.Pdf.init(allocator, .{});
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defer doc.deinit();
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doc.setTitle("Curves Demo");
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doc.setAuthor("zpdf");
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// =========================================================================
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// Page 1: Bezier Curves
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// =========================================================================
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{
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const page = try doc.addPage(.{});
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// Title
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try page.setFont(.helvetica_bold, 24);
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page.setFillColor(pdf.Color.rgb(41, 98, 255));
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try page.drawText(50, 780, "Bezier Curves");
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try page.setFont(.helvetica, 11);
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page.setFillColor(pdf.Color.black);
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try page.drawText(50, 755, "Cubic and quadratic Bezier curves for smooth paths");
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// Cubic Bezier curve
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try page.setLineWidth(2);
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page.setStrokeColor(pdf.Color.rgb(220, 20, 60)); // Crimson
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// Draw a smooth S-curve
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try page.drawBezier(
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100, 650, // Start point
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150, 700, // Control point 1
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250, 550, // Control point 2
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300, 600, // End point
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);
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// Label
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try page.setFont(.helvetica, 10);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(100, 520, "Cubic Bezier: S-curve");
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// Draw control points and lines for visualization
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try page.setLineWidth(0.5);
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page.setStrokeColor(pdf.Color.light_gray);
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try page.drawLine(100, 650, 150, 700);
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try page.drawLine(250, 550, 300, 600);
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// Control point markers
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page.setFillColor(pdf.Color.rgb(100, 100, 255));
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try page.fillCircle(100, 650, 4);
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try page.fillCircle(150, 700, 4);
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try page.fillCircle(250, 550, 4);
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try page.fillCircle(300, 600, 4);
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// Quadratic Bezier curve
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try page.setLineWidth(2);
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page.setStrokeColor(pdf.Color.rgb(50, 205, 50)); // Lime green
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try page.drawQuadBezier(
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350, 650, // Start point
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425, 550, // Control point
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500, 650, // End point
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);
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// Label
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try page.setFont(.helvetica, 10);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(350, 520, "Quadratic Bezier: Parabola");
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// Control point visualization
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try page.setLineWidth(0.5);
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page.setStrokeColor(pdf.Color.light_gray);
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try page.drawLine(350, 650, 425, 550);
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try page.drawLine(425, 550, 500, 650);
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page.setFillColor(pdf.Color.rgb(100, 100, 255));
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try page.fillCircle(350, 650, 4);
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try page.fillCircle(425, 550, 4);
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try page.fillCircle(500, 650, 4);
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// Multiple connected curves
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try page.setLineWidth(3);
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page.setStrokeColor(pdf.Color.rgb(255, 140, 0)); // Dark orange
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// First curve
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try page.drawBezier(50, 400, 100, 450, 150, 350, 200, 400);
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// Second curve (connected)
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try page.drawBezier(200, 400, 250, 450, 300, 350, 350, 400);
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// Third curve (connected)
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try page.drawBezier(350, 400, 400, 450, 450, 350, 500, 400);
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try page.setFont(.helvetica, 10);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(150, 320, "Connected Bezier curves for smooth paths");
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// Footer
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.medium_gray);
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try page.drawText(250, 50, "Page 1 of 2 - zpdf Curves Demo");
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}
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// =========================================================================
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// Page 2: Circles, Ellipses, and Arcs
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// =========================================================================
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{
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const page = try doc.addPage(.{});
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// Title
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try page.setFont(.helvetica_bold, 24);
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page.setFillColor(pdf.Color.rgb(41, 98, 255));
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try page.drawText(50, 780, "Circles, Ellipses & Arcs");
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try page.setFont(.helvetica, 11);
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page.setFillColor(pdf.Color.black);
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try page.drawText(50, 755, "Smooth curves approximated with cubic Bezier segments");
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// Circles
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try page.setFont(.helvetica_bold, 14);
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page.setFillColor(pdf.Color.black);
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try page.drawText(50, 700, "Circles");
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try page.setLineWidth(2);
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// Stroke circle
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page.setStrokeColor(pdf.Color.rgb(0, 128, 0));
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try page.drawCircle(120, 620, 40);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(90, 565, "Stroked");
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// Filled circle
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page.setFillColor(pdf.Color.rgb(135, 206, 250)); // Light sky blue
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try page.fillCircle(220, 620, 40);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(195, 565, "Filled");
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// Fill + stroke circle
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page.setFillColor(pdf.Color.rgb(255, 218, 185)); // Peach
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page.setStrokeColor(pdf.Color.rgb(205, 92, 92)); // Indian red
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try page.circle(320, 620, 40, .fill_stroke);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(290, 565, "Fill+Stroke");
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// Nested circles
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page.setStrokeColor(pdf.Color.rgb(128, 0, 128));
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try page.setLineWidth(1);
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try page.drawCircle(440, 620, 45);
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try page.drawCircle(440, 620, 35);
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try page.drawCircle(440, 620, 25);
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try page.drawCircle(440, 620, 15);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(415, 565, "Nested");
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// Ellipses
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try page.setFont(.helvetica_bold, 14);
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page.setFillColor(pdf.Color.black);
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try page.drawText(50, 520, "Ellipses");
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try page.setLineWidth(2);
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// Horizontal ellipse
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page.setStrokeColor(pdf.Color.rgb(255, 69, 0)); // Orange red
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try page.drawEllipse(120, 450, 60, 30);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(85, 405, "Horizontal");
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// Vertical ellipse
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page.setFillColor(pdf.Color.rgb(147, 112, 219)); // Medium purple
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try page.fillEllipse(250, 450, 30, 50);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(225, 385, "Vertical");
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// Ellipse with stroke
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page.setFillColor(pdf.Color.rgb(255, 255, 224)); // Light yellow
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page.setStrokeColor(pdf.Color.rgb(184, 134, 11)); // Dark goldenrod
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try page.ellipse(380, 450, 70, 35, .fill_stroke);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(345, 400, "Fill+Stroke");
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// Arcs
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try page.setFont(.helvetica_bold, 14);
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page.setFillColor(pdf.Color.black);
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try page.drawText(50, 340, "Arcs");
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try page.setLineWidth(3);
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// Quarter circle arc (0 to 90 degrees)
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page.setStrokeColor(pdf.Color.rgb(30, 144, 255)); // Dodger blue
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try page.drawArc(120, 250, 50, 50, 0, 90);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(90, 185, "90 degrees");
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// Half circle arc (0 to 180 degrees)
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page.setStrokeColor(pdf.Color.rgb(50, 205, 50)); // Lime green
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try page.drawArc(250, 250, 50, 50, 0, 180);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(215, 185, "180 degrees");
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// Three-quarter arc
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page.setStrokeColor(pdf.Color.rgb(255, 165, 0)); // Orange
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try page.drawArc(380, 250, 50, 50, 45, 315);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(345, 185, "270 degrees");
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// Elliptical arc
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page.setStrokeColor(pdf.Color.rgb(220, 20, 60)); // Crimson
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try page.drawArc(500, 250, 40, 60, 30, 270);
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.dark_gray);
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try page.drawText(465, 175, "Elliptical arc");
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// Footer
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try page.setFont(.helvetica, 9);
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page.setFillColor(pdf.Color.medium_gray);
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try page.drawText(250, 50, "Page 2 of 2 - zpdf Curves Demo");
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}
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// Save
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const filename = "curves_demo.pdf";
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try doc.save(filename);
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std.debug.print("Created: {s} ({d} pages)\n", .{ filename, doc.pageCount() });
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std.debug.print("Done!\n", .{});
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}
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