rounded_square.scad

// helper module for drawing rectangles with rounded borders
//
// (c) 2013 Metamáquina <http://www.metamaquina.com.br/>
//
// Author:
// * Felipe C. da S. Sanches <fsanches@metamaquina.com.br>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

module rounded_square(dim, corners=[10,10,10,10], center=false){
  w=dim[0];
  h=dim[1];

  if (center){
    translate([-w/2, -h/2])
    rounded_square_(dim, corners=corners);
  }else{
    rounded_square_(dim, corners=corners);
  }
}

module rounded_square_(dim, corners, center=false){
  w=dim[0];
  h=dim[1];
  render(){
    difference(){
      square([w,h]);

      if (corners[0])
        square([corners[0], corners[0]]);

      if (corners[1])
        translate([w-corners[1],0])
        square([corners[1], corners[1]]);

      if (corners[2])
        translate([0,h-corners[2]])
        square([corners[2], corners[2]]);

      if (corners[3])
        translate([w-corners[3], h-corners[3]])
        square([corners[3], corners[3]]);
    }

    if (corners[0])
      translate([corners[0], corners[0]])
      intersection(){
        circle(r=corners[0]);
        translate([-corners[0], -corners[0]])
        square([corners[0], corners[0]]);
      }

    if (corners[1])
      translate([w-corners[1], corners[1]])
      intersection(){
        circle(r=corners[1]);
        translate([0, -corners[1]])
        square([corners[1], corners[1]]);
      }

    if (corners[2])
      translate([corners[2], h-corners[2]])
      intersection(){
        circle(r=corners[2]);
        translate([-corners[2], 0])
        square([corners[2], corners[2]]);
      }

    if (corners[3])
      translate([w-corners[3], h-corners[3]])
      intersection(){
        circle(r=corners[3]);
        square([corners[3], corners[3]]);
      }
  }
}