int main(int argc, char *argv[]) {
/* register callbacks */
mpx_register_vc(&this_vc);
/* GUI */
static struct nk_context ctx;
static struct nk_canvas canvas;
uint32_t width = 0,
height = 0;
static struct nk_user_font font;
font.userdata.ptr = &width;
font.height = font_vga_8x16.height;
font.width = your_text_width_calculation;
nk_init_default(&ctx, &font);
width = this_vc.fb->var.xres;
height = this_vc.fb->var.yres;
/* Draw */
while (1)
{
/* what to draw */
canvas_begin(&ctx, &canvas, 0, 0, 0, width, height, nk_rgb(100,100,100));
{
canvas.painter->use_clipping = NK_CLIPPING_OFF;
nk_fill_rect(canvas.painter, nk_rect(15,15,140,140), 5, nk_rgb(247, 230, 154));
nk_fill_rect(canvas.painter, nk_rect(20,20,135,135), 5, nk_rgb(188, 174, 118));
nk_draw_text(canvas.painter, nk_rect(30, 30, 100, 20), "Text to draw", 12, &font, nk_rgb(188,174,118), nk_rgb(0,0,0));
nk_fill_rect(canvas.painter, nk_rect(160,20,70,70), 0, nk_rgb(0,0,255));
nk_fill_circle(canvas.painter, nk_rect(20,160,60,60), nk_rgb(255,0,0));
nk_fill_triangle(canvas.painter, 160, 160, 230, 160, 195, 220, nk_rgb(0,255,0));
nk_fill_arc(canvas.painter, 195, 120, 30, 0, 3.141592654f * 3.0f / 4.0f, nk_rgb(255,255,0));
nk_stroke_line(canvas.painter, 15, 10, 100, 10, 2.0f, nk_rgb(189,45,75));
nk_stroke_rect(canvas.painter, nk_rect(235, 20, 70, 70), 10, 3, nk_rgb(0,0,255));
nk_stroke_curve(canvas.painter, 235, 130, 252, 170, 288, 80, 305, 130, 1, nk_rgb(0,150,220));
nk_stroke_triangle(canvas.painter, 235, 160, 305, 160, 270, 220, 10, nk_rgb(255,0,143));
nk_stroke_circle(canvas.painter, nk_rect(90, 160, 60, 60), 2, nk_rgb(0,255,120));
/* load some image */
// uint32_t im_w, im_h, im_format;
// images[0] = stbi_load("SPBGU_logo.png", &im_w, &im_h, &im_format, 0);
// if (images[0] == NULL)
// printf("\nstbi_load doesn't work. :(\n");
// else {
// printf("\nLoaded image: id = %i width = %i\theight = %i\tformat = %i", (int)*images[0], im_w, im_h, im_format);
struct nk_image im;
im.handle.ptr = "SPBGU_logo.png";
im.handle.id = 0;
im.w = 0;
im.h = 0;
im.region[0] = 0;
im.region[1] = 0;
im.region[2] = 267;
im.region[3] = 333;
nk_draw_image(canvas.painter, nk_rect(320, 10, 130, 150), &im, nk_rgb(100, 0, 0));
// }
// stbi_image_free(images[0]);
}
canvas_end(&ctx, &canvas);
/* Draw each element */
draw(&this_vc, &ctx, width, height);
}
nk_free(&ctx);
printf("\nEnd of program.\nIf you see it then something goes wrong.\n");
return 0;
}
/* ===============================================================
*
* CUSTOM WIDGET
*
* ===============================================================*/
static int
ui_piemenu(struct nk_context *ctx, struct nk_vec2 pos, float radius,
struct nk_image *icons, int item_count)
{
int ret = -1;
struct nk_rect total_space;
struct nk_rect bounds;
int active_item = 0;
/* pie menu popup */
struct nk_color border = ctx->style.window.border_color;
struct nk_style_item background = ctx->style.window.fixed_background;
ctx->style.window.fixed_background = nk_style_item_hide();
ctx->style.window.border_color = nk_rgba(0,0,0,0);
total_space = nk_window_get_content_region(ctx);
ctx->style.window.spacing = nk_vec2(0,0);
ctx->style.window.padding = nk_vec2(0,0);
if (nk_popup_begin(ctx, NK_POPUP_STATIC, "piemenu", NK_WINDOW_NO_SCROLLBAR,
nk_rect(pos.x - total_space.x - radius, pos.y - radius - total_space.y,
2*radius,2*radius)))
{
int i = 0;
struct nk_command_buffer* out = nk_window_get_canvas(ctx);
const struct nk_input *in = &ctx->input;
total_space = nk_window_get_content_region(ctx);
ctx->style.window.spacing = nk_vec2(4,4);
ctx->style.window.padding = nk_vec2(8,8);
nk_layout_row_dynamic(ctx, total_space.h, 1);
nk_widget(&bounds, ctx);
/* outer circle */
nk_fill_circle(out, bounds, nk_rgb(50,50,50));
{
/* circle buttons */
float step = (2 * 3.141592654f) / (float)(MAX(1,item_count));
float a_min = 0; float a_max = step;
struct nk_vec2 center = nk_vec2(bounds.x + bounds.w / 2.0f, bounds.y + bounds.h / 2.0f);
struct nk_vec2 drag = nk_vec2(in->mouse.pos.x - center.x, in->mouse.pos.y - center.y);
float angle = (float)atan2(drag.y, drag.x);
if (angle < -0.0f) angle += 2.0f * 3.141592654f;
active_item = (int)(angle/step);
for (i = 0; i < item_count; ++i) {
struct nk_rect content;
float rx, ry, dx, dy, a;
nk_fill_arc(out, center.x, center.y, (bounds.w/2.0f),
a_min, a_max, (active_item == i) ? nk_rgb(45,100,255): nk_rgb(60,60,60));
/* separator line */
rx = bounds.w/2.0f; ry = 0;
dx = rx * (float)cos(a_min) - ry * (float)sin(a_min);
dy = rx * (float)sin(a_min) + ry * (float)cos(a_min);
nk_stroke_line(out, center.x, center.y,
center.x + dx, center.y + dy, 1.0f, nk_rgb(50,50,50));
/* button content */
a = a_min + (a_max - a_min)/2.0f;
rx = bounds.w/2.5f; ry = 0;
content.w = 30; content.h = 30;
content.x = center.x + ((rx * (float)cos(a) - ry * (float)sin(a)) - content.w/2.0f);
content.y = center.y + (rx * (float)sin(a) + ry * (float)cos(a) - content.h/2.0f);
nk_draw_image(out, content, &icons[i], nk_rgb(255,255,255));
a_min = a_max; a_max += step;
}
}
{
/* inner circle */
struct nk_rect inner;
inner.x = bounds.x + bounds.w/2 - bounds.w/4;
inner.y = bounds.y + bounds.h/2 - bounds.h/4;
inner.w = bounds.w/2; inner.h = bounds.h/2;
nk_fill_circle(out, inner, nk_rgb(45,45,45));
/* active icon content */
bounds.w = inner.w / 2.0f;
bounds.h = inner.h / 2.0f;
bounds.x = inner.x + inner.w/2 - bounds.w/2;
bounds.y = inner.y + inner.h/2 - bounds.h/2;
nk_draw_image(out, bounds, &icons[active_item], nk_rgb(255,255,255));
}
nk_layout_space_end(ctx);
if (!nk_input_is_mouse_down(&ctx->input, NK_BUTTON_RIGHT)) {
nk_popup_close(ctx);
ret = active_item;
}
} else ret = -2;
ctx->style.window.spacing = nk_vec2(4,4);
ctx->style.window.padding = nk_vec2(8,8);
nk_popup_end(ctx);
ctx->style.window.fixed_background = background;
ctx->style.window.border_color = border;
return ret;
}
static int
node_editor(struct nk_context *ctx)
{
int n = 0;
struct nk_rect total_space;
const struct nk_input *in = &ctx->input;
struct nk_command_buffer *canvas;
struct node *updated = 0;
struct node_editor *nodedit = &nodeEditor;
if (!nodeEditor.initialized) {
node_editor_init(&nodeEditor);
nodeEditor.initialized = 1;
}
if (nk_begin(ctx, "NodeEdit", nk_rect(0, 0, 800, 600),
NK_WINDOW_BORDER|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_MOVABLE|NK_WINDOW_CLOSABLE))
{
/* allocate complete window space */
canvas = nk_window_get_canvas(ctx);
total_space = nk_window_get_content_region(ctx);
nk_layout_space_begin(ctx, NK_STATIC, total_space.h, nodedit->node_count);
{
struct node *it = nodedit->begin;
struct nk_rect size = nk_layout_space_bounds(ctx);
struct nk_panel *node = 0;
if (nodedit->show_grid) {
/* display grid */
float x, y;
const float grid_size = 32.0f;
const struct nk_color grid_color = nk_rgb(50, 50, 50);
for (x = (float)fmod(size.x - nodedit->scrolling.x, grid_size); x < size.w; x += grid_size)
nk_stroke_line(canvas, x+size.x, size.y, x+size.x, size.y+size.h, 1.0f, grid_color);
for (y = (float)fmod(size.y - nodedit->scrolling.y, grid_size); y < size.h; y += grid_size)
nk_stroke_line(canvas, size.x, y+size.y, size.x+size.w, y+size.y, 1.0f, grid_color);
}
/* execute each node as a movable group */
while (it) {
/* calculate scrolled node window position and size */
nk_layout_space_push(ctx, nk_rect(it->bounds.x - nodedit->scrolling.x,
it->bounds.y - nodedit->scrolling.y, it->bounds.w, it->bounds.h));
/* execute node window */
if (nk_group_begin(ctx, it->name, NK_WINDOW_MOVABLE|NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER|NK_WINDOW_TITLE))
{
/* always have last selected node on top */
node = nk_window_get_panel(ctx);
if (nk_input_mouse_clicked(in, NK_BUTTON_LEFT, node->bounds) &&
(!(it->prev && nk_input_mouse_clicked(in, NK_BUTTON_LEFT,
nk_layout_space_rect_to_screen(ctx, node->bounds)))) &&
nodedit->end != it)
{
updated = it;
}
/* ================= NODE CONTENT =====================*/
nk_layout_row_dynamic(ctx, 25, 1);
nk_button_color(ctx, it->color);
it->color.r = (nk_byte)nk_propertyi(ctx, "#R:", 0, it->color.r, 255, 1,1);
it->color.g = (nk_byte)nk_propertyi(ctx, "#G:", 0, it->color.g, 255, 1,1);
it->color.b = (nk_byte)nk_propertyi(ctx, "#B:", 0, it->color.b, 255, 1,1);
it->color.a = (nk_byte)nk_propertyi(ctx, "#A:", 0, it->color.a, 255, 1,1);
/* ====================================================*/
nk_group_end(ctx);
}
{
/* node connector and linking */
float space;
struct nk_rect bounds;
bounds = nk_layout_space_rect_to_local(ctx, node->bounds);
bounds.x += nodedit->scrolling.x;
bounds.y += nodedit->scrolling.y;
it->bounds = bounds;
/* output connector */
space = node->bounds.h / (float)((it->output_count) + 1);
for (n = 0; n < it->output_count; ++n) {
struct nk_rect circle;
circle.x = node->bounds.x + node->bounds.w-4;
circle.y = node->bounds.y + space * (float)(n+1);
circle.w = 8; circle.h = 8;
nk_fill_circle(canvas, circle, nk_rgb(100, 100, 100));
/* start linking process */
if (nk_input_has_mouse_click_down_in_rect(in, NK_BUTTON_LEFT, circle, nk_true)) {
nodedit->linking.active = nk_true;
nodedit->linking.node = it;
nodedit->linking.input_id = it->ID;
nodedit->linking.input_slot = n;
}
/* draw curve from linked node slot to mouse position */
if (nodedit->linking.active && nodedit->linking.node == it &&
nodedit->linking.input_slot == n) {
struct nk_vec2 l0 = nk_vec2(circle.x + 3, circle.y + 3);
struct nk_vec2 l1 = in->mouse.pos;
nk_stroke_curve(canvas, l0.x, l0.y, l0.x + 50.0f, l0.y,
l1.x - 50.0f, l1.y, l1.x, l1.y, 1.0f, nk_rgb(100, 100, 100));
}
}
/* input connector */
space = node->bounds.h / (float)((it->input_count) + 1);
for (n = 0; n < it->input_count; ++n) {
struct nk_rect circle;
circle.x = node->bounds.x-4;
circle.y = node->bounds.y + space * (float)(n+1);
circle.w = 8; circle.h = 8;
nk_fill_circle(canvas, circle, nk_rgb(100, 100, 100));
if (nk_input_is_mouse_released(in, NK_BUTTON_LEFT) &&
nk_input_is_mouse_hovering_rect(in, circle) &&
nodedit->linking.active && nodedit->linking.node != it) {
nodedit->linking.active = nk_false;
node_editor_link(nodedit, nodedit->linking.input_id,
nodedit->linking.input_slot, it->ID, n);
}
}
}
it = it->next;
}
/* reset linking connection */
if (nodedit->linking.active && nk_input_is_mouse_released(in, NK_BUTTON_LEFT)) {
nodedit->linking.active = nk_false;
nodedit->linking.node = NULL;
fprintf(stdout, "linking failed\n");
}
/* draw each link */
for (n = 0; n < nodedit->link_count; ++n) {
struct node_link *link = &nodedit->links[n];
struct node *ni = node_editor_find(nodedit, link->input_id);
struct node *no = node_editor_find(nodedit, link->output_id);
float spacei = node->bounds.h / (float)((ni->output_count) + 1);
float spaceo = node->bounds.h / (float)((no->input_count) + 1);
struct nk_vec2 l0 = nk_layout_space_to_screen(ctx,
nk_vec2(ni->bounds.x + ni->bounds.w, 3.0f + ni->bounds.y + spacei * (float)(link->input_slot+1)));
struct nk_vec2 l1 = nk_layout_space_to_screen(ctx,
nk_vec2(no->bounds.x, 3.0f + no->bounds.y + spaceo * (float)(link->output_slot+1)));
l0.x -= nodedit->scrolling.x;
l0.y -= nodedit->scrolling.y;
l1.x -= nodedit->scrolling.x;
l1.y -= nodedit->scrolling.y;
nk_stroke_curve(canvas, l0.x, l0.y, l0.x + 50.0f, l0.y,
l1.x - 50.0f, l1.y, l1.x, l1.y, 1.0f, nk_rgb(100, 100, 100));
}
if (updated) {
/* reshuffle nodes to have least recently selected node on top */
node_editor_pop(nodedit, updated);
node_editor_push(nodedit, updated);
}
/* node selection */
if (nk_input_mouse_clicked(in, NK_BUTTON_LEFT, nk_layout_space_bounds(ctx))) {
it = nodedit->begin;
nodedit->selected = NULL;
nodedit->bounds = nk_rect(in->mouse.pos.x, in->mouse.pos.y, 100, 200);
while (it) {
struct nk_rect b = nk_layout_space_rect_to_screen(ctx, it->bounds);
b.x -= nodedit->scrolling.x;
b.y -= nodedit->scrolling.y;
if (nk_input_is_mouse_hovering_rect(in, b))
nodedit->selected = it;
it = it->next;
}
}
/* contextual menu */
if (nk_contextual_begin(ctx, 0, nk_vec2(100, 220), nk_window_get_bounds(ctx))) {
const char *grid_option[] = {"Show Grid", "Hide Grid"};
nk_layout_row_dynamic(ctx, 25, 1);
if (nk_contextual_item_label(ctx, "New", NK_TEXT_CENTERED))
node_editor_add(nodedit, "New", nk_rect(400, 260, 180, 220),
nk_rgb(255, 255, 255), 1, 2);
if (nk_contextual_item_label(ctx, grid_option[nodedit->show_grid],NK_TEXT_CENTERED))
nodedit->show_grid = !nodedit->show_grid;
nk_contextual_end(ctx);
}
}
nk_layout_space_end(ctx);
/* window content scrolling */
if (nk_input_is_mouse_hovering_rect(in, nk_window_get_bounds(ctx)) &&
nk_input_is_mouse_down(in, NK_BUTTON_MIDDLE)) {
nodedit->scrolling.x += in->mouse.delta.x;
nodedit->scrolling.y += in->mouse.delta.y;
}
}
nk_end(ctx);
return !nk_window_is_closed(ctx, "NodeEdit");
}