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@cy : Center Y Coordinate Attribute

The cy attribute specifies the vertical center position (center Y-coordinate) of circular and elliptical elements within the SVG coordinate system. It defines the vertical center point for circles, ellipses, and radial gradients in your PDF documents.

Usage

The cy attribute sets the vertical center position:

  • For <circle>: Y-coordinate of the circle’s center point
  • For <ellipse>: Y-coordinate of the ellipse’s center point
  • For <radialGradient>: Y-coordinate of the gradient’s focal/center point
<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
    <circle cx="100" cy="100" r="50" fill="#4CAF50"/>
</svg>

Supported Values

The cy attribute accepts unit values:

Unit Type Example Description
Points cy="100" or cy="100pt" Default unit, 1/72 of an inch
Pixels cy="100px" Screen pixels
Inches cy="2in" Physical inches
Centimeters cy="5cm" Metric centimeters
Millimeters cy="50mm" Metric millimeters
Percentage cy="50%" Percentage of parent viewport height

Default Value: 0 (centered at the top edge)

Supported Elements

The cy attribute is supported on the following SVG elements:

Element Usage
<circle> Vertical center coordinate of the circle
<ellipse> Vertical center coordinate of the ellipse
<radialGradient> Vertical position of the gradient’s outermost circle

Data Binding

The cy attribute supports dynamic values using data binding expressions with `` syntax.

Example 1: Dynamic Circle Positioning 

<!-- Model: { dot: { cx: 150, cy: 100, radius: 40, color: '#9C27B0' } } -->
<svg width="300" height="200">
    <circle cx="" cy="" r=""
            fill=""/>
</svg>

Example 2: Vertically Centered Element 

<!-- Model: { viewportWidth: 400, viewportHeight: 300 } -->
<svg width="" height="">
    <!-- Circle centered vertically and horizontally -->
    <circle cx="" cy="" r="60"
            fill="#FF5722"/>
</svg>

Example 3: Vertical Scatter Plot 

<!-- Model: { dataPoints: [
    {x: 80, cy: 180, r: 10, value: 45},
    {x: 140, cy: 120, r: 15, value: 75},
    {x: 200, cy: 200, r: 8, value: 30},
    {x: 260, cy: 80, r: 20, value: 95}
]} -->
<svg width="350" height="250">
    <template data-bind="">
        <circle cx="" cy="" r=""
                fill="#2196F3" opacity="0.7"/>
    </template>
</svg>

Notes

Center-Based Positioning

  • Unlike y which positions from the top edge, cy positions from the center
  • This makes circular layouts and vertical alignments more intuitive
  • The element is centered vertically at the specified coordinate

Coordinate System

  • SVG uses a coordinate system where Y increases downward
  • Positive cy values extend down from the top
  • Values can be negative but may render outside the visible viewport
  • The coordinate is relative to the parent element’s coordinate system

Default Behavior

  • If cy is not specified, it defaults to 0
  • A circle with cy="0" is centered at the top edge of the viewport
  • Use cy with cx to fully position circular elements in 2D space

Percentage Values

  • Percentage values are calculated relative to the parent viewport height
  • cy="50%" centers the element vertically in the parent
  • For nested SVG elements, percentages are relative to the immediate parent

Transform Operations

  • Transform operations are applied after initial positioning
  • The cy value represents position before any transformations
  • Transforms can move the effective center position

Radial Gradients

  • For <radialGradient>, cy defines where the gradient’s outer circle is centered vertically
  • Combined with fy (focal point Y), creates directional gradient effects
  • Default is 50% for centered gradients

Examples

Basic Circle Center 

<svg width="200" height="200">
    <circle cx="100" cy="100" r="70" fill="#2196F3"/>
</svg>

Vertical Stack of Circles 

<svg width="200" height="500">
    <circle cx="100" cy="70" r="40" fill="#f44336"/>
    <circle cx="100" cy="170" r="40" fill="#4CAF50"/>
    <circle cx="100" cy="270" r="40" fill="#2196F3"/>
    <circle cx="100" cy="370" r="40" fill="#FF9800"/>
    <circle cx="100" cy="470" r="40" fill="#9C27B0"/>
</svg>

Perfectly Centered Circle 

<svg width="300" height="250">
    <!-- Circle centered both horizontally and vertically -->
    <circle cx="50%" cy="50%" r="80" fill="#4CAF50"/>
</svg>

Vertical Line Chart Markers 

<svg width="450" height="300">
    <!-- Grid lines -->
    <line x1="50" y1="250" x2="400" y2="250" stroke="#e0e0e0" stroke-width="1"/>
    <line x1="50" y1="200" x2="400" y2="200" stroke="#e0e0e0" stroke-width="1"/>
    <line x1="50" y1="150" x2="400" y2="150" stroke="#e0e0e0" stroke-width="1"/>
    <line x1="50" y1="100" x2="400" y2="100" stroke="#e0e0e0" stroke-width="1"/>
    <line x1="50" y1="50" x2="400" y2="50" stroke="#e0e0e0" stroke-width="1"/>

    <!-- Axes -->
    <line x1="50" y1="30" x2="50" y2="270" stroke="#333" stroke-width="2"/>
    <line x1="50" y1="250" x2="420" y2="250" stroke="#333" stroke-width="2"/>

    <!-- Data points -->
    <polyline points="70,200 140,120 210,180 280,80 350,140"
              fill="none" stroke="#2196F3" stroke-width="3"/>

    <circle cx="70" cy="200" r="6" fill="#2196F3"/>
    <circle cx="140" cy="120" r="6" fill="#2196F3"/>
    <circle cx="210" cy="180" r="6" fill="#2196F3"/>
    <circle cx="280" cy="80" r="6" fill="#2196F3"/>
    <circle cx="350" cy="140" r="6" fill="#2196F3"/>
</svg>

Traffic Light 

<svg width="100" height="300">
    <!-- Housing -->
    <rect x="20" y="20" width="60" height="260" rx="10" fill="#333"/>

    <!-- Red light -->
    <circle cx="50" cy="65" r="25" fill="#c0392b"/>

    <!-- Yellow light -->
    <circle cx="50" cy="150" r="25" fill="#34495e"/>

    <!-- Green light (active) -->
    <circle cx="50" cy="235" r="25" fill="#27ae60"/>
</svg>

Ellipse Vertical Positioning 

<svg width="300" height="400">
    <ellipse cx="150" cy="100" rx="100" ry="60" fill="#e74c3c" opacity="0.6"/>
    <ellipse cx="150" cy="200" rx="100" ry="60" fill="#3498db" opacity="0.6"/>
    <ellipse cx="150" cy="300" rx="100" ry="60" fill="#2ecc71" opacity="0.6"/>
</svg>

Bubble Chart with Vertical Distribution 

<svg width="400" height="350">
    <!-- Small bubbles at top -->
    <circle cx="100" cy="80" r="25" fill="#e74c3c" opacity="0.6"/>
    <circle cx="300" cy="100" r="30" fill="#f39c12" opacity="0.6"/>

    <!-- Medium bubbles in middle -->
    <circle cx="200" cy="175" r="45" fill="#3498db" opacity="0.6"/>
    <circle cx="320" cy="200" r="35" fill="#2ecc71" opacity="0.6"/>

    <!-- Large bubbles at bottom -->
    <circle cx="150" cy="280" r="55" fill="#9b59b6" opacity="0.6"/>
    <circle cx="280" cy="260" r="40" fill="#16a085" opacity="0.6"/>
</svg>

Vertical Progress Indicator 

<svg width="100" height="400">
    <!-- Track -->
    <line x1="50" y1="50" x2="50" y2="350" stroke="#e0e0e0" stroke-width="8" stroke-linecap="round"/>

    <!-- Progress line -->
    <line x1="50" y1="50" x2="50" y2="250" stroke="#4CAF50" stroke-width="8" stroke-linecap="round"/>

    <!-- Current position marker -->
    <circle cx="50" cy="250" r="15" fill="#4CAF50" stroke="#fff" stroke-width="3"/>
</svg>

Vertical Gauge 

<svg width="150" height="400">
    <!-- Background bar -->
    <rect x="50" y="50" width="50" height="300" fill="#e0e0e0" rx="25"/>

    <!-- Fill (60% full) -->
    <rect x="50" y="170" width="50" height="180" fill="#4CAF50" rx="25"/>

    <!-- Markers -->
    <circle cx="25" cy="75" r="5" fill="#333"/>
    <circle cx="25" cy="200" r="5" fill="#333"/>
    <circle cx="25" cy="325" r="5" fill="#333"/>
</svg>

Radial Menu Items 

<svg width="300" height="300">
    <!-- Center button -->
    <circle cx="150" cy="150" r="30" fill="#2196F3"/>

    <!-- Menu items in circle around center -->
    <circle cx="150" cy="80" r="20" fill="#4CAF50"/>
    <circle cx="220" cy="150" r="20" fill="#4CAF50"/>
    <circle cx="150" cy="220" r="20" fill="#4CAF50"/>
    <circle cx="80" cy="150" r="20" fill="#4CAF50"/>

    <!-- Diagonal positions -->
    <circle cx="200" cy="100" r="20" fill="#FF9800"/>
    <circle cx="200" cy="200" r="20" fill="#FF9800"/>
    <circle cx="100" cy="200" r="20" fill="#FF9800"/>
    <circle cx="100" cy="100" r="20" fill="#FF9800"/>
</svg>

Radial Gradient with Offset Center 

<svg width="300" height="250">
    <defs>
        <radialGradient id="grad2" cx="50%" cy="30%">
            <stop offset="0%" style="stop-color:#64B5F6;stop-opacity:1"/>
            <stop offset="100%" style="stop-color:#0D47A1;stop-opacity:1"/>
        </radialGradient>
    </defs>
    <rect x="0" y="0" width="300" height="250" fill="url(#grad2)"/>
</svg>

Stacked Data Visualization 

<svg width="500" height="300">
    <!-- Category A -->
    <circle cx="100" cy="100" r="15" fill="#e74c3c"/>
    <circle cx="150" cy="100" r="15" fill="#e74c3c"/>
    <circle cx="200" cy="100" r="15" fill="#e74c3c"/>

    <!-- Category B -->
    <circle cx="100" cy="150" r="15" fill="#3498db"/>
    <circle cx="150" cy="150" r="15" fill="#3498db"/>

    <!-- Category C -->
    <circle cx="100" cy="200" r="15" fill="#2ecc71"/>
    <circle cx="150" cy="200" r="15" fill="#2ecc71"/>
    <circle cx="200" cy="200" r="15" fill="#2ecc71"/>
    <circle cx="250" cy="200" r="15" fill="#2ecc71"/>
</svg>

Vertical Timeline 

<svg width="250" height="500">
    <!-- Timeline line -->
    <line x1="50" y1="50" x2="50" y2="450" stroke="#2196F3" stroke-width="4"/>

    <!-- Event 1 -->
    <circle cx="50" cy="80" r="15" fill="#4CAF50"/>
    <rect x="80" y="65" width="150" height="30" fill="#E8F5E9" stroke="#4CAF50" rx="4"/>

    <!-- Event 2 -->
    <circle cx="50" cy="170" r="15" fill="#4CAF50"/>
    <rect x="80" y="155" width="150" height="30" fill="#E8F5E9" stroke="#4CAF50" rx="4"/>

    <!-- Event 3 -->
    <circle cx="50" cy="260" r="15" fill="#2196F3"/>
    <rect x="80" y="245" width="150" height="30" fill="#E3F2FD" stroke="#2196F3" rx="4"/>

    <!-- Event 4 -->
    <circle cx="50" cy="350" r="15" fill="#e0e0e0"/>
    <rect x="80" y="335" width="150" height="30" fill="#f5f5f5" stroke="#e0e0e0" rx="4"/>
</svg>

Molecule Structure 

<svg width="300" height="350">
    <!-- Central atom -->
    <circle cx="150" cy="175" r="35" fill="#2196F3" stroke="#1565C0" stroke-width="3"/>

    <!-- Top atom -->
    <line x1="150" y1="175" x2="150" y2="80" stroke="#999" stroke-width="3"/>
    <circle cx="150" cy="80" r="25" fill="#4CAF50" stroke="#2E7D32" stroke-width="2"/>

    <!-- Bottom atom -->
    <line x1="150" y1="175" x2="150" y2="270" stroke="#999" stroke-width="3"/>
    <circle cx="150" cy="270" r="25" fill="#4CAF50" stroke="#2E7D32" stroke-width="2"/>

    <!-- Left atom -->
    <line x1="150" y1="175" x2="70" y2="175" stroke="#999" stroke-width="3"/>
    <circle cx="70" cy="175" r="20" fill="#FF9800" stroke="#E65100" stroke-width="2"/>

    <!-- Right atom -->
    <line x1="150" y1="175" x2="230" y2="175" stroke="#999" stroke-width="3"/>
    <circle cx="230" cy="175" r="20" fill="#FF9800" stroke="#E65100" stroke-width="2"/>
</svg>

Dynamic Vertical Positioning 

<!-- Model: { markers: [
    {cx: 100, cy: 80, size: 12, label: 'High'},
    {cx: 200, cy: 150, size: 10, label: 'Medium'},
    {cx: 300, cy: 220, size: 8, label: 'Low'}
], color: '#2196F3' } -->
<svg width="400" height="280">
    <template data-bind="">
        <circle cx="" cy="" r=""
                fill="" opacity="0.7"/>
    </template>
</svg>

Bell Curve Distribution 

<svg width="500" height="300">
    <!-- Distribution curve (simulated with circles) -->
    <circle cx="250" cy="100" r="8" fill="#2196F3"/>
    <circle cx="220" cy="130" r="10" fill="#2196F3"/>
    <circle cx="280" cy="130" r="10" fill="#2196F3"/>
    <circle cx="190" cy="165" r="12" fill="#2196F3"/>
    <circle cx="250" cy="160" r="14" fill="#2196F3"/>
    <circle cx="310" cy="165" r="12" fill="#2196F3"/>
    <circle cx="160" cy="200" r="10" fill="#2196F3"/>
    <circle cx="340" cy="200" r="10" fill="#2196F3"/>
    <circle cx="130" cy="230" r="7" fill="#2196F3"/>
    <circle cx="370" cy="230" r="7" fill="#2196F3"/>
</svg>

Status Board 

<svg width="350" height="400">
    <!-- Row 1 -->
    <circle cx="50" cy="60" r="20" fill="#4CAF50"/>
    <circle cx="130" cy="60" r="20" fill="#4CAF50"/>
    <circle cx="210" cy="60" r="20" fill="#4CAF50"/>
    <circle cx="290" cy="60" r="20" fill="#f44336"/>

    <!-- Row 2 -->
    <circle cx="50" cy="140" r="20" fill="#4CAF50"/>
    <circle cx="130" cy="140" r="20" fill="#4CAF50"/>
    <circle cx="210" cy="140" r="20" fill="#4CAF50"/>
    <circle cx="290" cy="140" r="20" fill="#4CAF50"/>

    <!-- Row 3 -->
    <circle cx="50" cy="220" r="20" fill="#4CAF50"/>
    <circle cx="130" cy="220" r="20" fill="#FF9800"/>
    <circle cx="210" cy="220" r="20" fill="#4CAF50"/>
    <circle cx="290" cy="220" r="20" fill="#4CAF50"/>
</svg>

See Also

  • cx - Center X coordinate attribute
  • r - Radius attribute for circles
  • ry - Vertical radius for ellipses
  • y - Y coordinate attribute
  • circle - SVG circle element
  • ellipse - SVG ellipse element
  • radialGradient - SVG radial gradient element
  • SVG Transforms - Transformation operations
  • Data Binding - Data binding and expressions