// OSHW Logo Generator

// render_part=1; // gear_tooth_2d()
// render_part=2; // oshw_logo_2d()
// render_part=3; // 4mm shelled oshw_logo_2d()
//render_part=4; // 1 inch OSHW Coin

module gear_tooth_2d(scale=1.0) {
  scale([scale,scale]) polygon(
    points=[ [0,25.0], [90.0,12.0], [90.0,-12.0], [0,-25.0] ]
    , paths=[ [0,1,2,3] ]
    );
}

if(render_part==1) {
  echo("Rendering gear_tooth_2d()...");
  gear_tooth_2d();
}

module oshw_logo_2d(scale=1.0) {
  scale([scale,scale]) rotate(-45-90) {
    difference() {
      union() {
	  circle(r=70.0);
	  for(i=[1:7]) assign(rotAngle=360*i/8+45) rotate(rotAngle) {
	    gear_tooth_2d();
	  }
	}
	circle(r=25.0);
	intersection() {
	  rotate(-20) square(size=[100,100]);
	  rotate(20)  square(size=[100,100]);
	}
    }
  }
}

if(render_part==2) {
  echo("Rendering gear_tooth_2d()...");
  oshw_logo_2d();
}

module shell_2d(width=2.0,steps=8,scale_x=1.0,scale_y=1.0) {
  union() {
    for(i=[0:steps-1]) assign(rotAngle=360*i/steps) difference() {
      child(0);
      translate([scale_x*width*cos(rotAngle),scale_y*width*sin(rotAngle)]) 
	  child(0);
    }
  }
}

if(render_part==3) {
  // Note: Don't perform shell operation on oshw_logo_2d() directly. It's rather inefficient.
  echo("Rendering 4mm shelled gear_tooth_2d()...");
  shell_2d(width=4.0,steps=16,scale_x=1.0,scale_y=1.0)
//    oshw_logo_2d(scale=1.0);
    import_dxf(file="static_files/oshw_logo_2d.dxf");
}

module oshw_coin(scale=0.1, coin_h=10.0, coin_wall_th=4.0, extension=0.1) {
  scale([scale/200,scale/200,scale/200]) union() {
    difference() {
	cylinder(r=100.0,h=coin_h,center=false);
	translate([0,0,coin_wall_th])
	  cylinder(r=100.0-coin_wall_th,h=coin_h-coin_wall_th+extension,center=false);
	translate([0,0,-extension])  linear_extrude(height=coin_wall_th/2+extension,center=false) 
	  scale([(100.0-coin_wall_th)/100.0,(100.0-coin_wall_th)/100.0]) 
	    shell_2d(width=coin_wall_th,steps=32) import_dxf(file="static_files/oshw_logo_2d.dxf");
    }
    translate([0,0,coin_wall_th]) color([0,0,1.0]) linear_extrude(height=(coin_h-coin_wall_th)/2,center=false)
	  scale([(100.0-coin_wall_th)/100.0,(100.0-coin_wall_th)/100.0]) import_dxf(file="static_files/oshw_logo_2d.dxf");
    translate([0,0,coin_wall_th-extension]) color([0,0,0])
	linear_extrude(height=coin_h-coin_wall_th+extension,center=false) scale([(100.0-coin_wall_th)/100.0,(100.0-coin_wall_th)/100.0]) 
	  shell_2d(width=coin_wall_th,steps=32) import_dxf(file="static_files/oshw_logo_2d.dxf");
  }
}

if(render_part==4) {
  echo("Rendering OSHW Coin scaled to 25.4mm, aka 1 inch...");
  echo("  Note: Colours aren't preserved in the final STL output.");
  oshw_coin(scale=25.4,coin_h=20.0,coin_wall_th=8.0);
}