Hi folks,
the node red project I'm currently working on in my day job is at the point of being usable but I have to make an adjustment to my label (printed on a Dymo 450 thermal printer). The label is attached to a PCB and these new PCBs are just too small for our current 51mm x 19mm labels. So I'm reworking the layout for a 25mm x 25mm label, this doesn't lend itself to using a barcode so I'm switching to a QR code. I only need to put 68 characters into it so it's not very big.
So I have a template for my label and I'm able to add some man readable text to it, that all works fine on the current label. I can also make the QR code and save it to a flow.qr variable. The problem I'm having is combining my template (read from a png file) with the QR saved to the flow.qr I get no output from the node. I thought I had to use composite but then realised I probably should be using blit . . .
My template label png is 304 x 304 pixels and the QR code is approx 84 x 84 so there should be no problem with it fitting.
My test flow . . .
[{"id":"1778f6d3.186309","type":"image viewer","z":"b7065b03.85e128","name":"","width":160,"data":"payload","dataType":"msg","active":true,"x":1090,"y":1400,"wires":[[]]},{"id":"9d9012a6.2a615","type":"Barcode Generator","z":"b7065b03.85e128","name":"QR Code","data":"serial","dataType":"msg","barcode":"qrcode","barcodeType":"barcode","options":"","optionsType":"ui","sendProperty":"payload","props":[],"x":360,"y":1340,"wires":[["55f46c87.3663f4","d1aad62a.7addc8","5b0e0657.5e6698"]]},{"id":"f1bcfcf6.b6fea","type":"inject","z":"b7065b03.85e128","name":"Serial","props":[{"p":"serial","v":"00001066","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payloadType":"str","x":210,"y":1340,"wires":[["9d9012a6.2a615"]]},{"id":"dfe6eb84.8d2a88","type":"jimp-image","z":"b7065b03.85e128","name":"QR Merge","data":"payload","dataType":"msg","ret":"img","parameter1":"qr","parameter1Type":"flow","parameter2":"5","parameter2Type":"num","parameter3":"70","parameter3Type":"num","parameter4":"BLEND_SOURCE_OVER","parameter4Type":"none","parameter5":"","parameter5Type":"none","parameter6":"","parameter6Type":"none","parameter7":"","parameter7Type":"none","parameter8":"","parameter8Type":"msg","sendProperty":"payload","sendPropertyType":"msg","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 instance)","defaultType":"msg","defaultValue":"payload"},{"name":"x","type":"num","required":true,"hint":"the x position to blit the image"},{"name":"y","type":"num","required":true,"hint":"the y position to blit the image"},{"name":"srcx","type":"num","required":false,"hint":"the x position from which to crop the source image"},{"name":"srcy","type":"num","required":false,"hint":"the y position from which to crop the source image"},{"name":"srcw","type":"num","required":false,"hint":"the width to which to crop the source image"},{"name":"srch","type":"num","required":false,"hint":"the height to which to crop the source image"}]},"x":870,"y":1340,"wires":[["1778f6d3.186309"]]},{"id":"55f46c87.3663f4","type":"change","z":"b7065b03.85e128","name":"> flow.qr","rules":[{"t":"set","p":"qr","pt":"flow","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":520,"y":1340,"wires":[["857dc975.6722e8"]]},{"id":"857dc975.6722e8","type":"file in","z":"b7065b03.85e128","name":"Open label","filename":"/home/pi/dymo/1inchSqLabel.png","format":"","chunk":false,"sendError":false,"x":690,"y":1340,"wires":[["dfe6eb84.8d2a88","98f87b98.c5a4b8","4d68fd7d.2e4bb4"]]},{"id":"d1aad62a.7addc8","type":"image viewer","z":"b7065b03.85e128","name":"","width":160,"data":"payload","dataType":"msg","active":true,"x":530,"y":1400,"wires":[[]]},{"id":"98f87b98.c5a4b8","type":"image viewer","z":"b7065b03.85e128","name":"","width":160,"data":"payload","dataType":"msg","active":true,"x":830,"y":1400,"wires":[[]]},{"id":"4d68fd7d.2e4bb4","type":"function","z":"b7065b03.85e128","name":"check qr file","func":"msg.payload = flow.get(\"qr\");\n\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1070,"y":1260,"wires":[["5c25d5fc.fc9f2c"]]},{"id":"5c25d5fc.fc9f2c","type":"image viewer","z":"b7065b03.85e128","name":"","width":160,"data":"payload","dataType":"msg","active":true,"x":1310,"y":1400,"wires":[[]]},{"id":"5b0e0657.5e6698","type":"jimp-image","z":"b7065b03.85e128","name":"QR > file","data":"payload","dataType":"msg","ret":"img","parameter1":"qr.png","parameter1Type":"str","parameter2":"5","parameter2Type":"num","parameter3":"170","parameter3Type":"num","parameter4":"BLEND_OVERLAY","parameter4Type":"Blend","parameter5":"0.8","parameter5Type":"num","parameter6":"0.8","parameter6Type":"num","parameter7":"","parameter7Type":"msg","parameter8":"","parameter8Type":"msg","sendProperty":"payload","sendPropertyType":"msg","parameterCount":1,"jimpFunction":"write","selectedJimpFunction":{"name":"write","fn":"write","description":"Write to file. NOTE: You can specify an alternative file extension type to change the type. Currently support types are jpg, png, bmp.","parameters":[{"name":"filename","type":"str","required":true,"hint":"Name of the file","defaultType":"str"}]},"x":660,"y":1260,"wires":[[]]}]
