Hi Matthias, To give you a better idea, think of Photoshop and how it handles Layers and Groups. I need something similar. The Layer in my concept is a transparent drawing surface. My problem is that the current code draws everything at every frame (my output has some animation withing the drawing) What I want is to isolate the things that change from the things that do not change. So, in an ideal world where this layer would have existed, I would have called a specific layer's redraw method to make it adjust to the animation frame that it should display and after that, call the Group's refresh equivalent. This will cause the group representation to be changed by blit-ing all the group's layers onto a new surface. So, basically I need access to something similar to a DC. I need to draw, lines, rectangles, splines and bitmaps.
Peter On Mon, Sep 1, 2008 at 2:22 PM, Nitro <[EMAIL PROTECTED]> wrote: > Hey Peter, > > thanks for you interest. FloatCanvas2 is still in its very early stages, > so except the demo and the doc strings there's no api documentation right > now. > > Am 01.09.2008, 12:20 Uhr, schrieb Peter Damoc <[EMAIL PROTECTED]>: > > > Initial thoughts: > > > > I need to create a system of layers that are displayed conditionally. > > Drawing of each layer should be handled in each layer's "render" method. > > > > Now, the first thing I notice is that I don't seam to have direct access > > to > > drawing and going the > > > > self.fc.create( 'Circle', 50, parent = self.renderer, name = 'r%d' % 1, > > pos > > = (0, 0), look = fc.SolidColourLook( line_colour = 'blue', fill_colour = > > (255,0,0,128) ) ) > > > > route... seams like a recipe for spaghetti. > > Can you detail a bit what you want to draw? Do you want to draw circles, > polygons, lines, all of them? How many objects are there going to be? Do > you need the ability to save the drawing, do you want to export to svg? > Why do you want to use the GC directly? > FloatCanvas2 is strictly divided into a model and a view part. That's why > you feed your data like fc.create( 'Circle', ... ) to FloatCanvas. Now > there are various points where you can hook into to customize your > drawing. It is possible to create custom views where you can put your > layer "render" method into and which uses the GC directly. If you do this, > you'll lose the ability to export to svg though. You can also create a > custom node directly, without having to use a view at all. > To give you a conclusive answer how to customize the drawing, I need to > know the answers to the questions above. I am also thinking about doing a > generic Path primitive, so you can do arbitrary GC drawing without having > to use the GC directly, this might be useful in your case, too. > > > The second thing is the coordinate system. Can this be changed to > > something > > like "upper left is (0,0)"? Can I zoom-in using this kind of coordinates > > (kinda like viewing a zoomed in picture). > > Yes, there's canvas.camera. It's just like a normal node, you can move, > rotate and scale it. So if you do > > canvas.camera.position = (5, 5) it will make (5,5) appear at the center of > you window. If you want to zoom in, you can do > canvas.camera.zoom = (2, 2) and everything will appear double in size. > > It is also possible to make upper left (0,0). Right now I haven't made > this customizable, it will be with one of the next svn checkins. Here's > the temporary solution: > > 1) Open floatcanvas2/floatcanvas/nodes/camera.py > > 2) in the Camera._getViewBox method change "fromRectangleCenterSize" to > "fromRectangleCornerSize". > > 3) Save. > > Then if you do canvas.camera.position = (5,5) an object placed at (5,5) > will appear at the top left of the screen. > > -Matthias > _______________________________________________ > FloatCanvas mailing list > [email protected] > http://mail.mithis.com/cgi-bin/mailman/listinfo/floatcanvas > -- There is NO FATE, we are the creators.
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