Cumulocity SCADA组件能否使用经计算转换的测量值适配SVG图形？

Absolutely! You can definitely use computed or transformed measurements in Cumulocity's SCADA components, and there are two straightforward approaches to achieve your temperature range conversion (-20 to 100 → -90 to 90) for SVG graphics.

Option 1: Precompute the transformed value using Cumulocity's Calculated Measurements #

This is ideal if you need the converted value across multiple components or want to store the transformed data for historical purposes:

• Navigate to Data Management > Measurements > Calculations in your Cumulocity tenant
• Click Add calculation to create a new rule
• Select your target device and the original temperature measurement series (e.g., c8y_Temperature)
• Enter the conversion formula in the calculation editor. For your range, the formula simplifies to:

  1.5 * value - 60
  

  Let me break that down: Your original range spans 120 units (-20 to 100), and the target spans 180 units (-90 to 90). The scaling factor is 180/120 = 1.5. Adjusting for the offset gives us (value + 20) * 1.5 - 90, which simplifies to the formula above.
• Name the new measurement series (e.g., c8y_TransformedTemperature) and save the calculation
• Now, when configuring your SCADA SVG component, simply select this precomputed measurement series as your data source

Option 2: Apply on-the-fly conversion directly in the SCADA component #

If you only need the converted value for a single SVG component, skip precomputing and handle the conversion directly in the component's configuration:

• Open the SCADA editor and load your SVG graphic
• Bind your original temperature measurement to the SVG element you want to control (e.g., a gauge needle or progress bar)
• Look for an Advanced data binding or Expression field (location varies slightly by component type)
• Input the same conversion formula here:

  1.5 * value - 60
  

• Preview the component to verify: when the source temperature is -20, the converted value should be -90; when it's 100, it should hit 90. Intermediate values will scale linearly.

Quick Validation Check #

Let’s test a few values to confirm the formula works:

• Original temp = -20 → 1.5*(-20) -60 = -30 -60 = -90 ✔️
• Original temp = 0 → 1.5*0 -60 = -60 (which is 1/6 of the target range, matching the original position) ✔️
• Original temp = 100 → 1.5*100 -60 = 150 -60 = 90 ✔️

A Few Notes #

• Use Option 1 if you need the transformed value in multiple places (avoids redundant calculations)
• Option 2 is faster for one-off component setups
• If your SCADA component supports JavaScript expressions, you can also write the formula as ((value + 20) / 120) * 180 - 90 for more readability—both versions produce the same result

内容的提问来源于stack exchange，提问作者Bitwalk