Point-Circle Tangent

## Point-Circle Tangent

Calculate the tangent lines, tangent points, and center distance between a point and a circle.

## Parameter Configuration Description

### Main Interface Parameters
![](/media/202602/2026-02-12_105503_3820770.1391401385576434.png)

【**Standard Value**】 Set the required distance value. If the detected distance is not within the standard value range, the run result will display distance judgment failure.

【**Compensation Value**】 The value to compensate on the detected distance result.

【**Upper/Lower Deviation**】 Set the allowable upper and lower range of the difference between the detected distance and the standard value.
    Formula: Measured Value + Compensation Value = [Standard Value + Lower Deviation, Standard Value + Upper Deviation]

【**Size Conversion**】
    Calibration: Connect a calibration data source to convert image coordinates to real-world coordinates.
    
## Output Description
  Run Result: Outputs true if successful, false if failed.
  Tangent Count: The number of tangent lines from the input point to the input circle.
  Tangent Point 1: Tangent point 1 on the input circle.
  Tangent Point 2: Tangent point 2 on the input circle.
  Tangent Line 1: Tangent line 1 from the input point to the input circle.
  Tangent Line 2: Tangent line 2 from the input point to the input circle.
  Tangent Line 1 Angle: The angle of Tangent Line 1.
  Tangent Line 2 Angle: The angle of Tangent Line 2.
  Center Distance: The distance from the input point to the center of the input circle.
  Deviation Value: The difference between the Center Distance and the Standard Value.
  Distance Segment: The distance segment from the input point to the center of the input circle.
  Segment Angle: The angle of the distance segment from the input point to the center of the input circle.
![](/media/202602/2026-02-12_105830_0592550.5738747974541881.png)

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Click here to jump to the corresponding Chinese manual page: [Point-Circle Tangent](/doc/116)