body_dimensions.scad

// include
include <common.scad>
include <body_tables.scad>
include <BOSL2/std.scad>

// Sheet 1
KBD_FWD_Y = 13.5;
KBD_FWD_A = 30;
KBD_TOP_A = 13;
KBD_BACK_R = 14;

SCR_FWD_A = 12;
SCR_TOP_X = 182;

// Body height varies from 285.07 (X=182) to 283.64 (X=400),
// but we simplify it a constant 285
SCR_TOP_Y = 285; // custom; Sheet 30, Data List #2 for X=182

// Depth of the model
BODY_BACK_X = 400; // custom

// Default wall thickness
BODY_WALL = 4; // custom

// Calculate missing coordinates
kbd_fwd_x = adj_ang_to_opp(KBD_FWD_Y, KBD_FWD_A);

// echo("kbd_fwd_x", kbd_fwd_x); // 7.79423
// echo("KBD_FWD_Y", KBD_FWD_Y); // 13.5

/* Top back point of the keyboard
kbd_back_x and kbd_back_y are only defined by KBD_FWD_A and KBD_TOP_A

tan(KBD_TOP_A) = (y - KBD_FWD_Y) / (x - kbd_fwd_x)
x * tan(KBD_TOP_A) - kbd_fwd_x * tan(KBD_TOP_A) + KBD_FWD_Y = y

cotan(SCR_FWD_A) = (y - SCR_TOP_Y) / (x - SCR_TOP_X)
x * cotan(SCR_FWD_A) - SCR_TOP_X * cotan(SCR_FWD_A) + SCR_TOP_Y = y

x * tan(KBD_TOP_A) - kbd_fwd_x * tan(KBD_TOP_A) + KBD_FWD_Y =
    x * cotan(SCR_FWD_A) - SCR_TOP_X * cotan(SCR_FWD_A) + SCR_TOP_Y

x * tan(KBD_TOP_A) - x * cotan(SCR_FWD_A) =
    kbd_fwd_x * tan(KBD_TOP_A) - KBD_FWD_Y - SCR_TOP_X * cotan(SCR_FWD_A) + SCR_TOP_Y

x = (kbd_fwd_x * tan(KBD_TOP_A) - KBD_FWD_Y - SCR_TOP_X * cotan(SCR_FWD_A) + SCR_TOP_Y) / (tan(KBD_TOP_A) - cotan(SCR_FWD_A))
*/

kbd_back_x = (kbd_fwd_x * tan(KBD_TOP_A) - KBD_FWD_Y - SCR_TOP_X * cotan(SCR_FWD_A) + SCR_TOP_Y) / (tan(KBD_TOP_A) - cotan(SCR_FWD_A));
kbd_back_y = kbd_back_x * tan(KBD_TOP_A) - kbd_fwd_x * tan(KBD_TOP_A) + KBD_FWD_Y;

// echo("kbd_back_x", kbd_back_x); // 130.303
// echo("kbd_back_y", kbd_back_y); // 41.7833

// Extend the model to -Y and shorten the front edge to fit a larger keyboard; custom
EXTEND_Y = 6;
EXTEND_KBD_FWD_Y = 1.7;

// Extend forward top corner into -X and -Y:
// - extend model to -Y by EXTEND_Y, which makes keyboard top side extend to -X to keep the same front edge height
// - in addition, also decrease front edge height by EXTEND_KBD_FWD_Y to further extend the model into -X
extend_fwd_top_y = EXTEND_Y + EXTEND_KBD_FWD_Y;
extend_fwd_top_x = ang_opp_to_adj(KBD_TOP_A, extend_fwd_top_y);

// Adjust forward bottom corner to adapt, keeping all angles the same
extend_fwd_bot_y = EXTEND_Y;
extend_fwd_bot_x = extend_fwd_top_x - kbd_fwd_x + ang_adj_to_opp(KBD_FWD_A, KBD_FWD_Y - EXTEND_KBD_FWD_Y);

// Sheet 3, Sheet 19
// The YZ profile is slightly different for different X, see Figure 3 - Figure 16

YZ_TOP_CORNER_R = 20; // Sheet 6, Section AA-AA

// X values for which we have YZ_CURVE_X* tables
YZ_X = [0, 50, 100, 150, 200, 250/*, 300, 350, 400*/];

// Values from Sheet 29, Data List #1 for X values in YZ_X
XZ_CURVE_Y000 = [
    258.50000,  // X = 0
    259.92857,  // X = 50
    261.11905,  // X = 100
    262.07143,  // X = 150
    262.78571,  // X = 200
    263.26191,  // X = 250
    // 263.50000,  // X = 300
    // 263.50000,  // X = 350
    // 263.29190,  // X = 400
];

// Sheet 5
ZX_FWD_CORNER_R = 20; // Sheet 5, Bottom View H-H

// Empirically tuned to match keyboard forward rounded corners to the body sides
KBD_FWD_CORNER_ADJ_BOTTOM_Y = 0.55; // added to XZ_CURVE_Y000[0] when positioning bottom of the corner
KBD_FWD_CORNER_ADJ_TOP_Y = 0.2; // additional shift when positioning top of the corner

// Decorative bezel on certain edges
// Sheet 2, Section AD-AD, Section AE-AE, Section AH-AH
// TODO apply decorative bezel
//  - forward top edge of keyboard AD-AD
//  - side edges of the keyboard !REF
//  - forward top edge of the body AE-AE
//  - side edges of the body AH-AH
DEC_BEZEL_HEIGHT = .75;
DEC_BEZEL_R = 1.5;