Draw molecule on specific canvas area using drawMolecule

[vdyma]

We at Datagrok are using openchemlib for rendering molecules. It is a common task to render multiple molecules simultaneously, but currently it is necessary to use separate canvas element to be able to draw each molecule in a specific area of a larger canvas meaning excessive resources usage. It would be very useful to be able to draw a molecule in a specific canvas area when using drawMolecule by providing such parameters as xy coordinates of top left vertex of the area rectangle as well as its width and height.

[targos]

It looks like something that could be supported, but it needs some thinking about how to expose it in the API.
This is where the drawing actually happens:

openchemlib-js/src/com/actelion/research/gwt/gui/viewer/StructureView.java

Lines 236 to 239 in 77dfc46

	depictor.validateView(null, new Rectangle2D.Double(0, 0, (float) width, (float) height),
	AbstractDepictor.cModeInflateToMaxAVBL);
	ctx.clearRect(0, 0, width, height);
	depictor.paint(ctx);

Would you like to look into it and propose something?

[vdyma]

It seems the best if drawMolecule function had additional properties of the options parameter that would represent x and y coordinates of top left area vertex, its height and width. Another parameter clear could also prove useful to clear the specified area before drawing.

[StLeonidas]

@targos , this option remains significant. Are there any thoughts if it can or planned to be exposed to API?