1 /* nuklear - v1.00 - public domain */
2 static void
calculator(struct nk_context * ctx)3 calculator(struct nk_context *ctx)
4 {
5 if (nk_begin(ctx, "Calculator", nk_rect(10, 10, 180, 250),
6 NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_MOVABLE))
7 {
8 static int set = 0, prev = 0, op = 0;
9 static const char numbers[] = "789456123";
10 static const char ops[] = "+-*/";
11 static double a = 0, b = 0;
12 static double *current = &a;
13
14 size_t i = 0;
15 int solve = 0;
16 {int len; char buffer[256];
17 nk_layout_row_dynamic(ctx, 35, 1);
18 len = snprintf(buffer, 256, "%.2f", *current);
19 nk_edit_string(ctx, NK_EDIT_SIMPLE, buffer, &len, 255, nk_filter_float);
20 buffer[len] = 0;
21 *current = atof(buffer);}
22
23 nk_layout_row_dynamic(ctx, 35, 4);
24 for (i = 0; i < 16; ++i) {
25 if (i >= 12 && i < 15) {
26 if (i > 12) continue;
27 if (nk_button_label(ctx, "C")) {
28 a = b = op = 0; current = &a; set = 0;
29 } if (nk_button_label(ctx, "0")) {
30 *current = *current*10.0f; set = 0;
31 } if (nk_button_label(ctx, "=")) {
32 solve = 1; prev = op; op = 0;
33 }
34 } else if (((i+1) % 4)) {
35 if (nk_button_text(ctx, &numbers[(i/4)*3+i%4], 1)) {
36 *current = *current * 10.0f + numbers[(i/4)*3+i%4] - '0';
37 set = 0;
38 }
39 } else if (nk_button_text(ctx, &ops[i/4], 1)) {
40 if (!set) {
41 if (current != &b) {
42 current = &b;
43 } else {
44 prev = op;
45 solve = 1;
46 }
47 }
48 op = ops[i/4];
49 set = 1;
50 }
51 }
52 if (solve) {
53 if (prev == '+') a = a + b;
54 if (prev == '-') a = a - b;
55 if (prev == '*') a = a * b;
56 if (prev == '/') a = a / b;
57 current = &a;
58 if (set) current = &b;
59 b = 0; set = 0;
60 }
61 }
62 nk_end(ctx);
63 }
64
65