additional tools

[adamcanray]

hi,

continuing my question here #1643, i am about to add some tools that fit my current project. i was just thinking maybe there's other who need this, so i decided to open a pull request.

draw options:

• select: sometimes we want to only select a drawing object to edit the size or position without drawing any shapes. i don't know if this feature already exists or not, but i'll use it for my current project. also, i notice the draw options are all for shapes, and select is not a shape at all. the problem is that i will not be able to select drawing objects if i am not in the drawing layer.

tools:

• zoom-in: zoom-in on mousedown by adding a 0.1 scale step.
• zoom-out: zoom-out on mousedown by adding a -0.1 scale step.
• pan: pan on mousemove or touchmove.

note:

• zoom-in, zoom-out, and pan are reusing the existing code zoomPan. i copy it, then edit it a little.
• for zoom-in and zoom-out, the wheel is still active, so it can either do zoom-in or zoom-out with a click or touch, or zoom-in or zoom-out on the wheel or scroll.
• i only test this on chrome, not sure this is work well on other browser.

thanks.

[ivmartel]

Hi, thanks for all that. I just wanted to mention that tools can also be loaded directly in an app options, it does not have to live with the main code. It can live with your code and when you instantiate the dwv app, you pass an instance of the tool.
I'll create an example.

[adamcanray]

ah, it would be great if that was possible. looking forward to that example. thank you for replying, @ivmartel.

[ivmartel]

Here is a simple demo gist: https://gist.github.com/ivmartel/8bae193e47c0d1e7a29e1dbc43edb4f5
(which does not work on Firefox... not sure why...)