Also in the last example you sent with the gl.Ortho function on line 26 I
had to change the y transformation from y = cnv_h-1 - y
to y = cnv_h-2 - y to make it align with the frame border I think because
when calculating y the frm_y point is contained in the frame rastersize so
it is counted twice.
On Thu, Jul 6, 2017 at 11:43 AM, Milind Gupta <[email protected]>
wrote:
> Hi Antonio,
> Is it possible that I just use the Canvas Draw library to draw on
> the glcanvasbox?
>
>
> Milind
>
>
> On Mon, Jul 3, 2017 at 11:57 PM, Milind Gupta <[email protected]>
> wrote:
>
>> Hi Antonio,
>> Thanks a lot. This is really helpful.
>>
>> Milind
>>
>>
>> On Thu, Jun 29, 2017 at 8:26 PM, Antonio Scuri <[email protected]>
>> wrote:
>>
>>> BTW,
>>>
>>> I know that this is just an example, but if you are going to draw
>>> primitives in a canvas using elements as reference points, then I would
>>> suggest you to use the same coordinate system as the IupGLCanvasBox
>>> elements. For instance, using:
>>>
>>> gl.Ortho(0, width, 0, height, -1, 1)
>>>
>>> I attached a modified version of the example with this approach. Just
>>> to illustrate.
>>>
>>> Best,
>>> Scuri
>>>
>>>
>>> 2017-06-30 0:20 GMT-03:00 Antonio Scuri <[email protected]>:
>>>
>>>> Hi,
>>>>
>>>> You set the frame position to be 10,10. That's where the 10 pixel
>>>> offset came from. Experiment to set it to 50,50 and you will see that
>>>> difference to increase even more.
>>>>
>>>> So what's missing is to offset the desired point by the frame
>>>> position. For instance:
>>>>
>>>> local frm_x,frm_y = gframe.position:match("(%d+),(%d+)")
>>>> local frm_w,frm_h = gframe.rastersize:match("(%d+)x(%d+)")
>>>> local cnv_w,cnv_h = cnv.rastersize:match("(%d+)x(%d+)")
>>>>
>>>> -- calculate the bottom middle point
>>>> local x = frm_x + frm_w/2
>>>> local y = frm_y + frm_h
>>>>
>>>> local cnvx = cnv_w/2
>>>> local cnvy = cnv_h/2
>>>>
>>>> Best,
>>>> Scuri
>>>>
>>>> 2017-06-29 19:31 GMT-03:00 Milind Gupta <[email protected]>:
>>>>
>>>>> So the main thing is I am trying to use the frame box as a box in a
>>>>> flow almost like a flowchart. So I want to connect lines from a frame box
>>>>> to some other point.
>>>>>
>>>>> On Thu, Jun 29, 2017 at 3:29 PM, Milind Gupta <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> I have attached a sample code. This has a frame with just a label and
>>>>>> 2 lines that are drawn from the center to the the bottom line. The red
>>>>>> one
>>>>>> gets the bottom from rastersize while the blue one adds an offset of 10.
>>>>>>
>>>>>> On Thu, Jun 29, 2017 at 1:26 PM, Antonio Scuri <
>>>>>> [email protected]> wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> This is probably related to the space occupied by the TITLE area
>>>>>>> and in which callback you are using to draw. Can't tell you what's the
>>>>>>> best
>>>>>>> solution with just that information.
>>>>>>>
>>>>>>> To draw elements aligned with IUP elements inside a
>>>>>>> IupGLCanvasBox, I suggest you to use an IupGLSubCanvas element. You
>>>>>>> will be
>>>>>>> able to draw from 0 to rastersize in its GL_ACTION callback. Use the
>>>>>>> layout
>>>>>>> positioning to align the element inside the glframe.
>>>>>>>
>>>>>>> Best,
>>>>>>> Scuri
>>>>>>>
>>>>>>>
>>>>>>> 2017-06-29 17:08 GMT-03:00 Milind Gupta <[email protected]>:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>> I am trying to draw a line from the mid point of the base of
>>>>>>>> a glframe. When I get the rastersize of the frame and use that to
>>>>>>>> calculate
>>>>>>>> the midpoint of the base the point comes about 10px below the frame
>>>>>>>> line.
>>>>>>>> How can I remove this margin so that rastersize gives me the dimension
>>>>>>>> to
>>>>>>>> the frame line. In the x direction there does not seem to be any
>>>>>>>> margin.
>>>>>>>> Or is there a way to accurately find out the margin below
>>>>>>>> the frame line and then offset my line coordinate by that margin and
>>>>>>>> then
>>>>>>>> touch the frame line?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Milind
>>>>>>>>
>>>>>>>>
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>>>>>>
>>>>>
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