- From: Joel Rea <joel@mmcc.com>
- Date: Thu, 04 Aug 2011 16:00:00 +0000
- To: "'Brad Kemper'" <brad.kemper@gmail.com>
- Cc: "'Jerome Leclanche'" <adys.wh@gmail.com>, "'Brian Manthos'" <brianman@microsoft.com>, <www-style@w3.org>, 'François REMY' <fremycompany_pub@yahoo.fr>, "'fantasai'" <fantasai.lists@inkedblade.net>
An example of a use for border-radius-style would be if you wanted your box to have dotted or dashed sides, but solid corners. Or perhaps solid sides but doubled corners. And more to the point, it would keep the keyword “-style” having the same purpose and accepting the same values throughout. Having “border-radius-color” would likewise allow us to color the corners separately from the sides. With “border-radius-shape: box-convex;”, those could even take effect on otherwise ordinary-looking square-cornered boxes, while the “border-radius” parameter itself would specify just how much of the sides are included in the corners and thus affected by those styles and colors. Negative values for corner radii are hard to describe in text, but no, it's not the same thing as “border-radius-shape: concave.” Basically, if a value is negative, the algorithmic circle or ellipse is “flipped” along the box border to be OUTSIDE of the box instead of INSIDE in the case of the standard convex shape. Since the usual purpose would be if both horizontal and vertical radii are specified separately, with only one being negative, the effect would be that the corner curves OUTWARD, AWAY from the box, in one direction. Imagine a row of horizontal tabs sitting atop a large content box. When selected, a tab is the same background color as the box, and its bottom border disappears (becomes “border-bottom: none”), giving the impression of the tab being physically part of the content box. But, at present, we could only have the tab “rounded” at the top. Its sides would meet with the content box top at hard right angles. Something like this: #tab-bar .tab { background: beige; border: thin outset beige; border-bottom: none; border-radius-top-left: 5px; border-radius-top-right: 5px; ... } #tab-bar .current { /* currently selected tab would have class="tab current" */ background: white border: thin solid black; border-bottom: none; } The idea here would be to simply add these two lines to the “#tab-bar .tab” selector: border-radius-bottom-left: -3px / 3px; border-radius-bottom-right: -3px / 3px; What this would do is create small bottom corners that are rounded around invisible 3px-radius circles that now sit OUTSIDE the WIDTH of the tab horizontally, but still INSIDE the HEIGHT of the tab. The rounding would be visually concave, but still convex relative to the center of the circles. The background of the box would be extended at the bottom to reach the new, wider borders. The visual effect here is that the bottoms of the tabs are physically joined to the top of the content box with nice, realistic curves. I suppose I’ll need to draw a picture of this. No time right now, but when I get a breather, I will. -----Original Message----- From: Brad Kemper [mailto:brad.kemper@gmail.com] Sent: Thursday, August 04, 2011 1:54 AM To: Joel Rea Cc: Jerome Leclanche; Brian Manthos; <www-style@w3.org>; François REMY; fantasai Subject: Re: Idea : replacement for border-radius, a more complete corner styling property. On Aug 3, 2011, at 8:29 PM, "Joel Rea" <joel@mmcc.com> wrote: > First off, it’s “border-radius-SHAPE,” not “border-radius-STYLE.” The latter would have an entirely different purpose, more in keeping with what “border-style” does (“solid”, “double”, “dashed”, “dotted”, “inset”, “outset”, “groove”, “ridge”, etc., applied individually or to all four corner portions as specified in the relevant “border-radius” and shaped by “border-radius-shape”). Having separate border-styles for the corners does not sound very useful to me. > Secondly, using a negative value has a different purpose. What is it? > “border-radius-shape: concave” is a specific border rounding shape. What you described for 'border-radius-shape: concave' sounds like what negative values on border-radius should do (given the existing shape for positive values). A transition from positive to negative could even be animated smoothly.
Received on Wednesday, 31 August 2011 17:11:37 UTC