nx_viz_axis.nx source

1// nx_viz_axis.nx -- the AXIS layer of the sovereign Nishi viz library (the d3-axis equivalent, bits-up). 2// Composes scales (vs_ticks for tick values + vs_linear for value->pixel) + shapes' serializer (vsh_n/vsh_lit) 3// to emit a full SVG axis: baseline + tick marks + numeric labels. va_ticks is the KAT-able numeric core 4// (tick values + their pixel positions); va_axis_bottom is the render. Closes axis-ticks. license_tier: ORIGINAL 5import "nx_viz_scale.nx" 6import "nx_viz_shape.nx" 7import "nx_syscalls.nx" 8 9// numeric core: tick VALUES (vs_ticks) + their PIXEL positions (vs_linear). returns count. 10func va_ticks(d0: i64, d1: i64, target: i64, px0: i64, px1: i64, vals_out: *i64, px_out: *i64) -> i64 { 11 let cnt: i64 = vs_ticks(d0, d1, target, vals_out) 12 var i: i64 = 0 13 while i < cnt { 14 px_out[i] = vs_linear(d0, d1, px0, px1, vals_out[i]) 15 i = i + 1 16 } 17 return cnt 18} 19// render: bottom axis (baseline + downward tick marks + labels) -> out (null-terminated). returns length. 20func va_axis_bottom(d0: i64, d1: i64, px0: i64, px1: i64, target: i64, axis_y: i64, out: *u8) -> i64 { 21 let vals: *i64 = sys_mmap(256) as *i64 22 let pxs: *i64 = sys_mmap(256) as *i64 23 let cnt: i64 = va_ticks(d0, d1, target, px0, px1, vals, pxs) 24 var o: i64 = vsh_lit(out, 0, "<line x1=\"" as *u8) 25 o = vsh_n(out, o, px0); o = vsh_lit(out, o, "\" y1=\"" as *u8); o = vsh_n(out, o, axis_y) 26 o = vsh_lit(out, o, "\" x2=\"" as *u8); o = vsh_n(out, o, px1); o = vsh_lit(out, o, "\" y2=\"" as *u8); o = vsh_n(out, o, axis_y) 27 o = vsh_lit(out, o, "\" stroke=\"#888\"/>" as *u8) 28 var i: i64 = 0 29 while i < cnt { 30 o = vsh_lit(out, o, "<line x1=\"" as *u8); o = vsh_n(out, o, pxs[i]); o = vsh_lit(out, o, "\" y1=\"" as *u8); o = vsh_n(out, o, axis_y) 31 o = vsh_lit(out, o, "\" x2=\"" as *u8); o = vsh_n(out, o, pxs[i]); o = vsh_lit(out, o, "\" y2=\"" as *u8); o = vsh_n(out, o, axis_y + 6) 32 o = vsh_lit(out, o, "\" stroke=\"#888\"/>" as *u8) 33 o = vsh_lit(out, o, "<text x=\"" as *u8); o = vsh_n(out, o, pxs[i]); o = vsh_lit(out, o, "\" y=\"" as *u8); o = vsh_n(out, o, axis_y + 20) 34 o = vsh_lit(out, o, "\" text-anchor=\"middle\" font-size=\"11\" fill=\"#aaa\">" as *u8); o = vsh_n(out, o, vals[i]); o = vsh_lit(out, o, "</text>" as *u8) 35 i = i + 1 36 } 37 out[o] = 0 as u8 38 return o 39} 40// render: left axis (vertical line + leftward tick marks + right-aligned labels) -> out. returns length. 41// py0 maps d0 (bottom, larger y in SVG), py1 maps d1 (top). (d3.axisLeft) 42func va_axis_left(d0: i64, d1: i64, py0: i64, py1: i64, target: i64, axis_x: i64, out: *u8) -> i64 { 43 let vals: *i64 = sys_mmap(256) as *i64 44 let pys: *i64 = sys_mmap(256) as *i64 45 let cnt: i64 = vs_ticks(d0, d1, target, vals) 46 var i: i64 = 0 47 while i < cnt { pys[i] = vs_linear(d0, d1, py0, py1, vals[i]); i = i + 1 } 48 var o: i64 = vsh_lit(out, 0, "<line x1=\"" as *u8) 49 o = vsh_n(out, o, axis_x); o = vsh_lit(out, o, "\" y1=\"" as *u8); o = vsh_n(out, o, py0) 50 o = vsh_lit(out, o, "\" x2=\"" as *u8); o = vsh_n(out, o, axis_x); o = vsh_lit(out, o, "\" y2=\"" as *u8); o = vsh_n(out, o, py1) 51 o = vsh_lit(out, o, "\" stroke=\"#888\"/>" as *u8) 52 i = 0 53 while i < cnt { 54 o = vsh_lit(out, o, "<line x1=\"" as *u8); o = vsh_n(out, o, axis_x - 6); o = vsh_lit(out, o, "\" y1=\"" as *u8); o = vsh_n(out, o, pys[i]) 55 o = vsh_lit(out, o, "\" x2=\"" as *u8); o = vsh_n(out, o, axis_x); o = vsh_lit(out, o, "\" y2=\"" as *u8); o = vsh_n(out, o, pys[i]) 56 o = vsh_lit(out, o, "\" stroke=\"#888\"/>" as *u8) 57 o = vsh_lit(out, o, "<text x=\"" as *u8); o = vsh_n(out, o, axis_x - 10); o = vsh_lit(out, o, "\" y=\"" as *u8); o = vsh_n(out, o, pys[i] + 4) 58 o = vsh_lit(out, o, "\" text-anchor=\"end\" font-size=\"11\" fill=\"#aaa\">" as *u8); o = vsh_n(out, o, vals[i]); o = vsh_lit(out, o, "</text>" as *u8) 59 i = i + 1 60 } 61 out[o] = 0 as u8 62 return o 63} 64func main() -> i64 { return 0 }