Home

IQCad — Smart Engineering

IQCad is a free, cross-platform 2D CAD application designed for civil engineering and tunnelling workflows. Built with Free Pascal and Lazarus, it provides an AutoCAD-familiar drawing environment with specialized tools for TIN surfaces, survey points, tunnel cross-section analysis, and LandXML interoperability.

Platforms

• Windows (x86_64)
• Linux (x86_64)

Features

Drawing Tools

• 25+ entity types — Line, Polyline, Arc (11 creation methods), Circle, Ellipse, Spline, Rectangle, Point, Hatch, Image, Text, MText, Table, Multileader, Multiline, 3DPolyline, 3DFace, Polygon Clip
• 12 dimension types — Linear, Aligned, Angular, Arc Length, Radius, Diameter, Jogged, Ordinate, Baseline, Continue
• Block definitions and insertions with recursive support
• AutoCAD-style command line with alias resolution
• Object snaps — Endpoint, Midpoint, Center, Intersection, Perpendicular, Nearest, Node
• Grip editing and multiple selection modes (click, window, crossing)

Modify Commands

• Move, Copy, Rotate, Scale, Mirror, Offset, Erase
• Trim, Extend, Chamfer, Fillet
• PEDIT (polyline editing)
• Draw Order (Front, Back, Above, Below)

Styles and Formatting

• Layers with color, linetype, and visibility control
• Linetypes (.LIN file format)
• Text styles, Dimension styles, Table styles
• Multiline styles, Point styles
• AutoCAD-compatible hatch patterns (ANSI, ISO, predefined, custom)

Civil Engineering

• Survey Points — CSV import, point groups, coordinate management
• TIN Surfaces — Delaunay triangulation, contour generation (major/minor with smoothing), spot elevations, decimation, boundary management
• Tunnel Section Lines — measured cross-sections, deviation analysis, DR (Deviation Ratio) labels
• Alignments — horizontal with tangents, curves, and spirals
• Civil Prospector — tree-based management UI for all civil data
• Civil Label Styles — configurable labels for survey points, contours, and spot elevations

File Formats

Format	Read	Write
IQML (native XML)	Yes	Yes
DXF (R12, R2000, R2018)	Yes	Yes
LandXML	Yes	Yes
PDF	—	Yes
PNG / JPEG	—	Yes
SVG	—	Yes

Layout and Printing

• Multi-layout paper space with viewports
• Page setup (paper size, orientation, margins)
• PDF export with viewport rendering and plot styles

User Interface

• Ribbon toolbar with 7 tabs: Home, Draw, Modify, Format, Output, Civil, Layout
• Dark theme
• Tabbed multi-document interface with per-drawing undo/redo
• Map background layers (OpenStreetMap, ESRI, custom tile servers)
• Unit-aware display: Decimal, Engineering, Architectural, Scientific, Fractional

Built With

• Free Pascal — compiler
• Lazarus — IDE and component library
• OpenGL + GDI — rendering

Getting Started

1. Download the latest release for your platform
2. Extract the archive
3. Run IQcad.exe (Windows) or IQcad (Linux)

No installation required.