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Pixel Precision Zoom - Visual Guide

Layout Diagram

┌─────────────────────────────────────────────────────────────┐
│  MagickCrop Main Window                                     │
│  ┌───────────────────────────────────────────────────────┐  │
│  │ Main Image Canvas                                     │  │
│  │                                                        │  │
│  │              ┌─────────────────┐                      │  │
│  │              │  Pixel Zoom     │  ← Zoom preview      │  │
│  │              │  ╔═════════╗    │     appears here     │  │
│  │              │  ║ ┌─────┐ ║    │                      │  │
│  │              │  ║ │ ╬═╬ │ ║    │  6x magnified       │  │
│  │              │  ║ └─────┘ ║    │  image region       │  │
│  │              │  ╚═════════╝    │                      │  │
│  │              │   X:123, Y:456  │  ← Coordinates       │  │
│  │              └─────────────────┘                      │  │
│  │                    ↓                                   │  │
│  │              [Corner Marker] ← User is dragging       │  │
│  │                                 this marker            │  │
│  │                                                        │  │
│  └───────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────┘

Zoom Control Components

        150px × 150px
    ┌─────────────────┐
    │  ╔═══════════╗  │  ← Blue border (#0066FF, 3px thick)
    │  ║           ║  │
    │  ║     │     ║  │  ← Red vertical crosshair line
    │  ║  ───┼───  ║  │  ← Red horizontal crosshair line
    │  ║     │     ║  │
    │  ║     ●     ║  │  ← Red center dot (4px)
    │  ║           ║  │
    │  ╚═══════════╝  │
    │  ┌───────────┐  │
    │  │ X:123,Y:456│ │  ← Coordinate display (white text, black background)
    │  └───────────┘  │
    └─────────────────┘
         Circular border with rounded corners (75px radius)

Interaction Flow

Step 1: Initial State

Main Image
┌────────────────────┐
│                    │
│    [●] Corner      │  ← Corner marker visible
│                    │     Zoom control hidden
│                    │
└────────────────────┘

Step 2: User Clicks Corner Marker

Main Image
┌────────────────────┐
│  ┌─────────┐       │
│  │ Zoom    │       │  ← Zoom appears near cursor
│  │ ╔═══╗   │       │     (offset by 40px)
│  │ ║╬═╬║   │       │
│  │ ╚═══╝   │       │
│  │ X:50,Y:25│      │
│  └─────────┘       │
│    [●] Corner      │  ← Marker being dragged
│                    │
└────────────────────┘

Step 3: User Drags to New Position

Main Image
┌────────────────────┐
│                    │
│                    │
│         ┌─────────┐│  ← Zoom follows cursor
│         │ Zoom    ││     Updates position smoothly
│         │ ╔═══╗   ││
│         │ ║╬═╬║   ││     Shows magnified view
│         │ ╚═══╝   ││     of new location
│         │X:150,Y:100│
│         └─────────┘│
│               [●]  │  ← Marker at new position
└────────────────────┘

Step 4: User Releases Mouse Button

Main Image
┌────────────────────┐
│                    │
│                    │  ← Zoom disappears
│                    │
│               [●]  │  ← Marker at final position
│                    │
└────────────────────┘

Zoom Magnification Detail

Original Image (shown at actual size)

┌───────┐
│░▒▓█▓▒░│  ← 7 pixels wide
│▒▓███▓▒│
│▓█████▓│
│█████▓▒│  ← Various shades/colors
│▓███▓▒░│
│▒▓█▓▒░ │
│░▒▓▒░  │
└───────┘

Magnified View in Zoom Control (6x)

┌─────────────────────────────────────────┐
│ ░░ ░░ ░░ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██ ▓▓ ▓▓│
│ ░░ ░░ ░░ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██ ▓▓ ▓▓│
│ ░░ ░░ ░░ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██ ▓▓ ▓▓│
│ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██ ██ ██ ██ ██ ██│
│ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██│██ ██ ██ ██ ██│  ← Crosshair shows
│ ▒▒ ▒▒ ▒▒ ▓▓ ▓▓ ▓▓ ██ ██ ██─┼─██ ██ ██ ██ ██│     exact pixel
│ ▓▓ ▓▓ ▓▓ ██ ██ ██ ██ ██ ██│██ ██ ██ ██ ██│
│ ▓▓ ▓▓ ▓▓ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██│
│ ▓▓ ▓▓ ▓▓ ██ ██ ██ ██ ██ ██ ██ ██ ██ ▓▓ ▓▓│
└─────────────────────────────────────────┘
Each pixel is now 6x6 display pixels

Use Cases Illustrated

Use Case 1: Aligning Transform Corner to Document Edge

Before Zoom:
┌──────────────┐
│  Document    │
│  Edge here?  │  ← Hard to see exact edge
│  ↓           │
│  [●]         │
└──────────────┘

With Zoom:
┌──────────────┐     ┌─────────┐
│  Document    │     │ Zoom    │
│  Edge        │     │ ╔═══╗   │  ← Clearly shows
│              │     │ ║│══║   │     document edge
│  [●]         │     │ ╚═══╝   │     at exact pixel
└──────────────┘     └─────────┘

Use Case 2: Placing Measurement Point on Small Feature

Before Zoom:
┌──────────────┐
│  ●   ●   ●   │  ← Which dot to target?
│              │
│     [+]      │  ← Cursor here
└──────────────┘

With Zoom:
┌──────────────┐     ┌─────────┐
│  ●   ●   ●   │     │ Zoom    │
│              │     │ ╔═══╗   │
│     [+]      │     │ ║●╬●║   │  ← See exact dot
└──────────────┘     │ ║ ● ║   │     under cursor
                     │ ╚═══╝   │
                     └─────────┘

Color and Style Specification

Zoom Window Border

  • Color: #0066FF (Application accent blue)
  • Thickness: 3 pixels
  • Style: Solid
  • Shape: Circular (75px border radius)

Crosshair

  • Color: #FF0000 (Red)
  • Thickness: 1 pixel
  • Opacity: 0.8 (80%)
  • Components:
    • Vertical line: Full height
    • Horizontal line: Full width
    • Center dot: 4px diameter circle

Coordinate Display

  • Background: #CC000000 (80% black)
  • Text Color: White (#FFFFFF)
  • Font: Default UI font
  • Size: 10pt
  • Format: "X: {x}, Y: {y}"

Positioning Offsets

  • Primary offset: 40px right, 40px up from cursor
  • Fallback offset: 40px left if too close to right edge
  • Vertical fallback: 40px down if too close to top edge

Performance Characteristics

Render Pipeline

Mouse Move Event
      ↓
Get Canvas Position (mousePos)
      ↓
Convert to Image Coordinates
      ↓
Calculate Capture Region (25×25 px)
      ↓
Create CroppedBitmap
      ↓
Apply ScaleTransform (6x)
      ↓
Update ZoomImage.Source
      ↓
Update Coordinate Display
      ↓
Reposition Zoom Control
      ↓
Render to Screen

Typical Performance

  • Image size: Up to 4000×3000 pixels
  • Update frequency: 60 FPS (smooth mouse tracking)
  • Memory usage: ~1-2 MB for zoom buffer
  • CPU usage: Minimal (<5% on modern hardware)

Accessibility Features

Visual Indicators

  • High contrast crosshair (red on image)
  • Large text for coordinates
  • Clear border for zoom window boundary

Automatic Behavior

  • No manual activation needed
  • Works with all input methods (mouse, touchpad, pen)
  • Disappears when not needed (non-intrusive)

Browser/Environment Support

Supported:

  • ✅ Windows 10 version 20348.0+
  • ✅ Windows 11
  • ✅ .NET 9.0 runtime
  • ✅ WPF applications
  • ✅ High DPI displays (automatic scaling)

Not Supported:

  • ❌ macOS (WPF not available)
  • ❌ Linux (WPF not available)
  • ❌ Web browsers (desktop application only)

Comparison with Similar Tools

PowerToys Color Picker

PowerToys                      MagickCrop Pixel Zoom
┌─────────┐                    ┌─────────┐
│ Zoom    │                    │ Zoom    │
│ ╔═══╗   │                    │ ╔═══╗   │
│ ║╬═╬║   │  Similar!          │ ║╬═╬║   │
│ ╚═══╝   │                    │ ╚═══╝   │
│ #RGB    │  Color info        │ X,Y     │  Position info
└─────────┘                    └─────────┘

Adobe Photoshop Navigator

Photoshop Navigator            MagickCrop Pixel Zoom
┌───────────────┐              ┌─────────┐
│ [Mini Image]  │              │ Zoom    │
│ ┌──────────┐  │              │ ╔═══╗   │
│ │  [View]  │  │ Persistent   │ ║╬═╬║   │ On-demand
│ └──────────┘  │ window       │ ╚═══╝   │ popup
│ Zoom: 600%    │              │ X,Y     │
└───────────────┘              └─────────┘

This visual guide helps understand how the Pixel Precision Zoom feature works and how it integrates into the MagickCrop application workflow.