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Unable to use a `Symbol` for a `Group` with paper.js

By : Susan Lee
Date : September 18 2020, 04:00 PM
To fix this issue I want to do an animation of a reaction-diffusion system with paper.js. , Syntactically, I think there's a small issue here:
code :
|           |          |          |           ^ changing fill color of Rect
|           |          |          ^ accessing children of group
|           |          ^ should be item*
|           ^ SymbolDefinition
^ array of placed symbols

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Paper.js: can't set fillColor of a symbol instance

By : Abenezer Ashenafi
Date : March 29 2020, 07:55 AM
it fixes the issue I'm new to paper.js. , Answered by Jonathan Puckey, of the paper.js team:

Creating a stamp/symbol brush in paper.js

By : hubyub
Date : March 29 2020, 07:55 AM
I hope this helps . You should definitely create the symbol outside the event handling function, otherwise the svg will be read on each mouse move event and a new symbol will be created each time. And there is no need for cloning, simply placing the symbol should work. The following snipplet works (using a sample svg), but it does not read the svg from file.
code :
var symbol =  new Symbol(project.importSVG('<svg  xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><rect x="10" y="10" height="100" width="100" style="stroke:#ff0000; fill: #0000ff"/></svg>'));

function onMouseMove(event) {      

two-way binding of paper-radio-group / paper-radio-button value with Vaadin 10

By : rajesh avula
Date : March 29 2020, 07:55 AM
this will help I suspect this is caused by a security feature of Flow. Arbitrary model value changes from the client are not accepted for security reasons. Instead, changes are only allowed for properties that are used in two-way template bindings (i.e. {{propertyName}}) or explicitly annotated with @AllowClientUpdates on the corresponding Java getter.
The logic that looks for {{propertyName}} doesn't have any specific knowledge about the inner workings of , so it cannot know that {{item.aOrBProperty}} corresponds to myListOfSomething[*].aOrBProperty.

Detect symbol on paper

By : Laapin
Date : March 29 2020, 07:55 AM
I wish this helpful for you The question deals with an aspect of document image analysis thats interesting, but quite rudimentary.
For your question 1. its something best decided on your own. Can you honestly not think of any such symbol? Assuming you have some time to try out a few symbols and recognition results ... quite simple to be answered by self. Hint: think in terms of touchscreens on phones. They often have Gesture Recognition - usually for something like locking the screen, or even shortcuts. What sort of gestures are usually used - look at the screenshots here please. The recognition is way more interesting. Assuming that the symbol is drawn on a clear and visible sheet of paper and can be easily separated as an object from the image (by connected components, available in OpenCV), try matching Moments. Either simple moments, or Hu invariant moments, both of which are present in OpenCV. For simple hand-drawn symbols these should be sufficient.

Associating a paper-radio-button (wrapped by a div) with a paper-radio-group?

By : user5627318
Date : March 29 2020, 07:55 AM
this one helps. To add tooltips create an id for each radiobutton that needs a tooltip. You can then use for and refer to the id. There is no need for a wrapper div.
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