Dynamically setting property when merging 2 images

General
1

@Steve-Mcl

I'm trying to bargraph indicator using your image node

I'm wanting to set srch from outside the node config

how do I do that as this isn';t working for me

image
image1277Ă—328 23 KB

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2

?

?

Not following Simon sorry.

Can you clarify pls? Perhaps showing a mock image of what you're trying to achieve with some annotations would help?

3

The last image after the merge shows 50/50 red/green as set in the merge node srch parameter

how can I vary that from outside the node config?

Trying to make a poor mans bargraph indicator :slight_smile:

4

No urgent reply needed :slight_smile:

5

Something like this?

chrome_LYPo4yQPFO

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90","props":[{"p":"payload"},{"p":"srch","v":"90","vt":"num"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":610,"y":2540,"wires":[["4d6b8738aa3dd8f3"]]},{"id":"8a5acac070aadc19","type":"jimp-image","z":"6e46a349d744ceaa","name":"Merge msg.red + msg.green","data":"green","dataType":"msg","ret":"img","parameter1":"red","parameter1Type":"msg","parameter2":"0","parameter2Type":"num","parameter3":"0","parameter3Type":"num","parameter4":"0","parameter4Type":"num","parameter5":"0","parameter5Type":"num","parameter6":"160","parameter6Type":"num","parameter7":"srch","parameter7Type":"msg","parameter8":"","parameter8Type":"","sendProperty":"payload","parameterCount":7,"jimpFunction":"blit","selectedJimpFunction":{"name":"blit","fn":"blit","description":"blit the image with another Jimp image at x, y, optionally cropped","parameters":[{"name":"src","type":"","required":true,"hint":"the source image (a Jimp 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top","rules":[{"t":"set","p":"payload","pt":"msg","to":"{\"w\":160,\"h\":100,\"background\":\"#FF0000\"}","tot":"json"},{"t":"set","p":"payload.background","pt":"msg","to":"tc","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":860,"y":2500,"wires":[["46c730c1f55f238d"]]},{"id":"47f691d411e667ad","type":"image viewer","z":"6e46a349d744ceaa","name":"","width":"40","data":"red","dataType":"msg","active":true,"x":1270,"y":2500,"wires":[["9943c6baa3eab5db"]]},{"id":"098b32704a7ba2eb","type":"jimp-image","z":"6e46a349d744ceaa","name":"Create base 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base","rules":[{"t":"set","p":"payload","pt":"msg","to":"{\"w\":160,\"h\":100,\"background\":\"#00FF00\"}","tot":"json"},{"t":"set","p":"payload.background","pt":"msg","to":"bc","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":870,"y":2580,"wires":[["098b32704a7ba2eb"]]},{"id":"6dcfc6555a908f58","type":"change","z":"6e46a349d744ceaa","name":"","rules":[{"t":"set","p":"bc","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":1270,"y":2360,"wires":[[]]},{"id":"3e70c84616046a68","type":"inject","z":"6e46a349d744ceaa","name":"set base colour blue","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"#0000FF","payloadType":"str","x":1050,"y":2340,"wires":[["6dcfc6555a908f58"]]},{"id":"324693771e1603db","type":"inject","z":"6e46a349d744ceaa","name":"set base colour 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silver","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"#d1d1d1","payloadType":"str","x":650,"y":2380,"wires":[["4cb31650492d4b80"]]},{"id":"4d6b8738aa3dd8f3","type":"junction","z":"6e46a349d744ceaa","x":780,"y":2500,"wires":[["3bed55b6569bb12a"]]}]

Key to working with images in Node-RED is to minimise (completely eliminate where possible) branches as each wire branch creates an expensive clone of the image data.

Look at my flow, see how i utilise properties in the msg to store the top and base images and carry them along a single flow until the last node.

That's why the image viewer node has an output. I know its not pretty but the larger the image, the more it becomes important.

2 Likes
6

Just going thru your flow one step at a time :slight_smile:

Why is msg.payload.background still set to "#FF0000" at this point?

Why isn't it the saved flow.tc image?

image
image1359Ă—238 23 KB

7

I don't know what flow.tc is set to in your context so I can't comment.

Does it all work for you as it did for me in the demo gif?

8

Sorry for noise ! Usual PEBKAC at this end

It works lovely - I was just trying to go thru one step at a time to make sure I new what was going on and failed at my 1st step

I'm going to blame the fact that I had a bad nights sleep and its early in the morning :slight_smile:

2 Likes
9

And I now see my error in my orig - wasn't setting srch (and the using in merge) correctly

Do going back to your point about memory usuage

Instinctively, I'd now write your flow as

image
image876Ă—344 22.1 KB

to avoid one of the NR gods having apoplexy at a wire sticking thru an output switch :slight_smile:

is there still a penalty if the viewer switch is off?

10

Yes. The message is still transmitted down the wire.

And this conversation now dovetails nicely into another thread...

11

Does this gods name rhyme with "wave" :wink:

@dceejay

1 Like
12

That thread is what made me try this - to come up with a method of having a bargraph "guage" but using your existing viewer node :slight_smile:

13

Without breaking any rules ..

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image

4 Likes
14

And don't they look lovely working together :slight_smile:
gauge

2 Likes
15

image
image844Ă—564 80 KB

2 Likes
16

Yes they do

17

@cymplecy Don't forget you can also use unicode chars... Unicode Block “Block Elements”

image
image788Ă—188 9.58 KB

1 Like
18

And you can print the value over image too

19

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