[Dr Magnusson]

Map in a box posted:

I can get the world position of panels, and I have a push/pop method that is ready to have some code put into it.
But look, here is the problem with your method:
I can't have subpanels clip and their parents with a different clip. That's why I can't just use g.setWorldClip, because you can't "stack" the clips.

That's why you keep track of clips using a stack like Dajoh said.

Here's a really quick example I wrote up in lua:

local clip = {stack = {{x =0, y = 0, w = 3000, h = 3000}}, current = {x =0, y = 0, w = 3000, h = 3000}}

function clip.push(x, y, w, h)
    local c = clip.current
    
    -- If the new region is smaller in any way than the old region, compress the current region to fit.
    if(x + w < c.x + c.w) then c.w = w end
    if(y + h < c.y + c.h) then c.h = h end    
    if(x > c.x) then c.x = x end
    if(y > c.y) then c.y = y end
    table.insert(clip.stack, {x = x, y = y, w = w, h = h})
end

function clip.pop()
    if(#clip.stack <= 0) then return end
    -- Remove the "current" stack
    table.remove(clip.stack, #clip.stack)
    
    local c = clip.current
    local o = clip.stack[#clip.stack]
    
    -- If the old region on the stack is bigger in any way, expand the relevant component to fit.
    if(o.x + o.w > c.x + c.w) then c.w = o.w end
    if(o.y + o.h > c.y + c.h) then c.h = o.h end    
    if(o.x < c.x) then c.x = o.x end
    if(o.y < c.y) then c.y = o.y end
end

function clip.getRegion()
    return clip.current.x, clip.current.y, clip.current.w, clip.current.h
end

-- Tests
print("start: ", clip.getRegion())
clip.push(10, 10, 200, 200)
print("push: ", clip.getRegion())
clip.push(50, 10, 50, 200)
print("push: ", clip.getRegion())
clip.push(10, 70, 200, 130)
print("push: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())

It outputs this, which is the expected output. It's basically the smallest possible region that doesn't expand beyond any of the given points.

lua clip.lua
start:  0       0       3000    3000
push:   10      10      200     200
push:   50      10      50      200
push:   50      70      50      130
pop:    50      10      50      200
pop:    10      10      200     200
pop:    0       0       3000    3000

[jonnopon3000]

Progress on my stab at rendering an image as text!
After some modifications and working it through to find the issue with the colouration, I have managed to turn this:



Into this:



Right now, the only character it writes in is +'s, and there is an inevitable smoothing issue due to the way I am doing it. When I process a coloured striped image similar to the test above, I only get half of the image processed...so I've gotta find out why.
Next stages are implementing a character set and refining the method to produce a more detailed and accurate representation of the colours in a processed image.

For anyone who is interested, here's the source :)

[Map in a box]

Dr Magnusson posted:

That's why you keep track of clips using a stack like Dajoh said.

Here's a really quick example I wrote up in lua:

local clip = {stack = {{x =0, y = 0, w = 3000, h = 3000}}, current = {x =0, y = 0, w = 3000, h = 3000}}

function clip.push(x, y, w, h)
    local c = clip.current
    
    -- If the new region is smaller in any way than the old region, compress the current region to fit.
    if(x + w < c.x + c.w) then c.w = w end
    if(y + h < c.y + c.h) then c.h = h end    
    if(x > c.x) then c.x = x end
    if(y > c.y) then c.y = y end
    table.insert(clip.stack, {x = x, y = y, w = w, h = h})
end

function clip.pop()
    if(#clip.stack <= 0) then return end
    -- Remove the "current" stack
    table.remove(clip.stack, #clip.stack)
    
    local c = clip.current
    local o = clip.stack[#clip.stack]
    
    -- If the old region on the stack is bigger in any way, expand the relevant component to fit.
    if(o.x + o.w > c.x + c.w) then c.w = o.w end
    if(o.y + o.h > c.y + c.h) then c.h = o.h end    
    if(o.x < c.x) then c.x = o.x end
    if(o.y < c.y) then c.y = o.y end
end

function clip.getRegion()
    return clip.current.x, clip.current.y, clip.current.w, clip.current.h
end

-- Tests
print("start: ", clip.getRegion())
clip.push(10, 10, 200, 200)
print("push: ", clip.getRegion())
clip.push(50, 10, 50, 200)
print("push: ", clip.getRegion())
clip.push(10, 70, 200, 130)
print("push: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())
clip.pop()
print("pop: ", clip.getRegion())

It outputs this, which is the expected output. It's basically the smallest possible region that doesn't expand beyond any of the given points.

lua clip.lua
start:  0       0       3000    3000
push:   10      10      200     200
push:   50      10      50      200
push:   50      70      50      130
pop:    50      10      50      200
pop:    10      10      200     200
pop:    0       0       3000    3000

The children need to be clipped to the parents, too.

[Dr Magnusson]

Map in a box posted:

The children need to be clipped to the parents, too.

Then push the panel's clipping region as you traverse down the chain of panels as you draw them.

function Panel:draw()
    clip.push(self.x, self.y, self.w, self.h)
    g.setClipRegion(clip.getRegion())
    -- Draw panel here
    for _, child in pairs(self.children) do
        child:draw()
    end
    clip.pop()
end

I don't know what I'm supposed to be explaining to you at this point, all the tools for doing what you want are by your fingertips.

[Deco Da Man]

Map in a box posted:

The children need to be clipped to the parents, too.

Here's the solution I used for my LÖVE GUI library:

    function Panel:render(ax, ay, aw, ah)
        local X, Y = self.X, self.Y
        local nax, nay = ax+X, ay+Y
        --print(self, aw-X, self.W)
        local naw, nah = math.min(aw-X, self.W), math.min(ah-Y, self.H)
        if naw > 0 and nah > 0 then
            love.graphics.push()
                love.graphics.translate(X, Y)
                love.graphics.setScissor(nax, nay, naw, nah)
                self:draw()
                local children = self.Children
                for child_i = 1, #children do
                    children[child_i]:render(nax, nay, naw, nah)
                end
            love.graphics.pop()
        end
        love.graphics.setScissor()
    end

[nekosune]

Currently waiting for the www.udacity.com courses to start

[Paulendy]

Programming courses are cool and all but the write ups are fucking annoying.

[Map in a box]

Dr Magnusson posted:

Then push the panel's clipping region as you traverse down the chain of panels as you draw them.

function Panel:draw()
    clip.push(self.x, self.y, self.w, self.h)
    g.setClipRegion(clip.getRegion())
    -- Draw panel here
    for _, child in pairs(self.children) do
        child:draw()
    end
    clip.pop()
end

I don't know what I'm supposed to be explaining to you at this point, all the tools for doing what you want are by your fingertips.

Slick2D doesn't support stacked clips, which was my main problem to begin with. I'll just make a bug report.

Edited:

What I'm working on: A web browser.

[neos300]

Malbodge.

I'm going to go drill a hole in my head now.

[Downsider]

Map in a box posted:

Slick2D doesn't support stacked clips, which was my main problem to begin with. I'll just make a bug report.

Edited:

What I'm working on: A web browser.

There's only one thing you need support for, and that's clipping before you actually render. Does Slick2D do that? In other words, in your tests, is only one clip applying, and that clip being the last clip you perform?

If not, then Slick2D provides everything you need.. except a brain, of course.

[ROBO_DONUT]

Map in a box posted:

Slick2D doesn't support stacked clips, which was my main problem to begin with. I'll just make a bug report.

It's going to get ignored. You have everything you need already, and I've given you the answer.

If you want to find the region where rectangles overlap, you find the minimum of the maximum bounds and the maximum of the minimum bounds. So as you're traversing the UI elements, you calculate and apply the new clip region as described. If you use recursion, you don't even need to write any fancy data structures, classes or subroutines to keep track of the clip regions, since each stack frame will have the correct clip region for that UI element.

[iPope]

Paulendy posted:

Programming courses are cool and all but the write ups are fucking annoying.

-snip img-

Your telling me! I have to make a table of every variable in my code and every fucking function it's used in with a page referance to that code page. What the fuck is the use of that?

[Map in a box]

Yes, unfortunately. I need to clip all the children and the subchildren, like what I do when I translate them.

Edited:

ROBO_DONUT posted:

It's going to get ignored. You have everything you need already, and I've given you the answer.

If you want to find the region where rectangles overlap, you find the minimum of the maximum bounds and the maximum of the minimum bounds. So as you're traversing the UI elements, you calculate and apply the new clip region as described. If you use recursion, you don't even need to write any fancy data structures, classes or subroutines to keep track of the clip regions, since each stack frame will have the correct clip region for that UI element.

Look, with your method a subpanel could clip outside of its root panel. That is why I'm saying it won't work.

[ben1066]

amcfaggot posted:

uh, alien swarm already has vscript

Indeed it does, however vscript is closed source, by implementing it myself I have greater access.

[icantread49]

Map in a box posted:

Look, with your method a subpanel could clip outside of its root panel. That is why I'm saying it won't work.

dude

no, it can't

you find the intersection of your stack of clip rectangles, and you set that as the final clip rectangle

Edited:

[ROBO_DONUT]

Map in a box posted:

Look, with your method a subpanel could clip outside of its root panel.

No, it can't. That doesn't even make sense.

What you want is the intersection of the set of pixels, applied recursively as you traverse the UI tree.
So, we start with a full-screen rectangle denoted 'A'. For the first (root) UI element, confined to rectangle 'B', the drawable region is 'A∩B'. Then for the first child, in rectangle 'C', the drawable region would be '(A∩B)∩C'. That is, we take the previous calculated result ('A∩B'), and intersect that with the clip region for the current UI element, 'C', resulting in 'A∩B∩C'. Every clip region for every parent, child, and sub-child all the way up and down the chain is accounted for. All you need is the formula for the intersection of rectangles, which I've given to you.

It's:

x_min = max(x_min, current.x_min);
x_max = min(x_max, current.x_max);
y_min = max(y_min, current.y_min);
y_max = min(y_max, current.y_max);
if (x_min > x_max || y_min > y_max) {
  // no visible pixels
  return;
}

Apply recursively.

[Protocol7]

Finally wrote a hello world.

In Java.

For Android.

It's actually not terrible. But when I write Java something about everything kind of irks me

[Map in a box]

I'm sorry, you're just confusing me even more. I'll work on clipping later.

[Darkwater124]

Game == setup

[Staneh]

Just another day in Programmers Chat.

[BlkDucky]

Staneh posted:

Just another day in Programmers Chat.

oh man

it's basically a list of people I've wanted to ban from that chat but for some reason Jallen won't let me.

edit: except you of course, stan

[icantread49]

someone made me a theme song in FP chat!

http://puu.sh/hxYH

[Map in a box]

Fixing key input in my web browser and i'll show it off. Because I'm proud of et.

[Staneh]

AGOP

[icantread49]

~~SHI~RI~~NIAN~~

[leontodd]

icantread49 posted:

someone made me a theme song in FP chat!

http://puu.sh/hxYH

Better than the original, downloading this now.

[Maurice]

leontodd posted:

Better than the original, downloading this now.

Contradiction

[icantread49]

there was another one ?? tell me!

[alexaz]

poor mans whiteboard :(

[ROBO_DONUT]

I think you mean awesome dude's whiteboard.
I'll take graph paper over whiteboard anyday.

[supersnail11]

I just noticed this on udacity's website:

If they actually do that, that'd be awesome.

[nekosune]

supersnail11 posted:

I just noticed this on udacity's website:

If they actually do that, that'd be awesome.

I would so sign up for that one as soon as you can enroll

[Hexxeh]

Can anyone recommend a tool for Mac to record a window onscreen along with the systems audio output? I used Jing previously, but this outputs to SWF, and I want something that outputs to a sane format I can upload to YouTube.

[ben1066]

Use quicktime? http://osxdaily.com/2010/11/16/screen-recorder-mac/

[efeX]

alexaz posted:

poor mans whiteboard :(

glad you drew that out, i hate when i forget the auth, inventory, damage, and entities are controlled by the server.

[supersnail11]

Hexxeh posted:

Can anyone recommend a tool for Mac to record a window onscreen along with the systems audio output? I used Jing previously, but this outputs to SWF, and I want something that outputs to a sane format I can upload to YouTube.

ScreenFlow?

[HiredK]

I'm having a little issue with HDR,. This is the wanted result, only works if I render it directly to a screen quad



However if I bind the output to a buffer I get a weird artifact... (I tried to change the buffer to GL_RGBA16F and to clamp/unclamp it but no luck) not sure what's causing it, anyone seen that before?

[alexaz]

efeX posted:

glad you drew that out, i hate when i forget the auth, inventory, damage, and entities are controlled by the server.

That shows 4 threads being controlled by the network thread.

[Catdaemon]

Dem networked clocks. Aww yeah.

[high]

Just rewrote one of my older programs(SpeedTest Forger) Decided to try WPF too. All I have to say is WOW. WPF is so much nicer than WinForms. Going to have to switch LoLNotes over to it.

Did a time-lapse of it (recorded 2 fps, playback 12 fps).

Here is a screenshot of it.


And of course here is the source.
https://github.com/high6/SpeedTest-Generator

(I really should blog this kind of stuff :|)