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-rw-r--r--nuklear/demo/node_editor.c343
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+/* nuklear - v1.00 - public domain */
+/* This is a simple node editor just to show a simple implementation and that
+ * it is possible to achieve it with this library. While all nodes inside this
+ * example use a simple color modifier as content you could change them
+ * to have your custom content depending on the node time.
+ * Biggest difference to most usual implementation is that this example does
+ * not have connectors on the right position of the property that it links.
+ * This is mainly done out of laziness and could be implemented as well but
+ * requires calculating the position of all rows and add connectors.
+ * In addition adding and removing nodes is quite limited at the
+ * moment since it is based on a simple fixed array. If this is to be converted
+ * into something more serious it is probably best to extend it.*/
+struct node {
+ int ID;
+ char name[32];
+ struct nk_rect bounds;
+ float value;
+ struct nk_color color;
+ int input_count;
+ int output_count;
+ struct node *next;
+ struct node *prev;
+};
+
+struct node_link {
+ int input_id;
+ int input_slot;
+ int output_id;
+ int output_slot;
+ struct nk_vec2 in;
+ struct nk_vec2 out;
+};
+
+struct node_linking {
+ int active;
+ struct node *node;
+ int input_id;
+ int input_slot;
+};
+
+struct node_editor {
+ int initialized;
+ struct node node_buf[32];
+ struct node_link links[64];
+ struct node *begin;
+ struct node *end;
+ int node_count;
+ int link_count;
+ struct nk_rect bounds;
+ struct node *selected;
+ int show_grid;
+ struct nk_vec2 scrolling;
+ struct node_linking linking;
+};
+static struct node_editor nodeEditor;
+
+static void
+node_editor_push(struct node_editor *editor, struct node *node)
+{
+ if (!editor->begin) {
+ node->next = NULL;
+ node->prev = NULL;
+ editor->begin = node;
+ editor->end = node;
+ } else {
+ node->prev = editor->end;
+ if (editor->end)
+ editor->end->next = node;
+ node->next = NULL;
+ editor->end = node;
+ }
+}
+
+static void
+node_editor_pop(struct node_editor *editor, struct node *node)
+{
+ if (node->next)
+ node->next->prev = node->prev;
+ if (node->prev)
+ node->prev->next = node->next;
+ if (editor->end == node)
+ editor->end = node->prev;
+ if (editor->begin == node)
+ editor->begin = node->next;
+ node->next = NULL;
+ node->prev = NULL;
+}
+
+static struct node*
+node_editor_find(struct node_editor *editor, int ID)
+{
+ struct node *iter = editor->begin;
+ while (iter) {
+ if (iter->ID == ID)
+ return iter;
+ iter = iter->next;
+ }
+ return NULL;
+}
+
+static void
+node_editor_add(struct node_editor *editor, const char *name, struct nk_rect bounds,
+ struct nk_color col, int in_count, int out_count)
+{
+ static int IDs = 0;
+ struct node *node;
+ assert((nk_size)editor->node_count < LEN(editor->node_buf));
+ node = &editor->node_buf[editor->node_count++];
+ node->ID = IDs++;
+ node->value = 0;
+ node->color = nk_rgb(255, 0, 0);
+ node->input_count = in_count;
+ node->output_count = out_count;
+ node->color = col;
+ node->bounds = bounds;
+ strcpy(node->name, name);
+ node_editor_push(editor, node);
+}
+
+static void
+node_editor_link(struct node_editor *editor, int in_id, int in_slot,
+ int out_id, int out_slot)
+{
+ struct node_link *link;
+ assert((nk_size)editor->link_count < LEN(editor->links));
+ link = &editor->links[editor->link_count++];
+ link->input_id = in_id;
+ link->input_slot = in_slot;
+ link->output_id = out_id;
+ link->output_slot = out_slot;
+}
+
+static void
+node_editor_init(struct node_editor *editor)
+{
+ memset(editor, 0, sizeof(*editor));
+ editor->begin = NULL;
+ editor->end = NULL;
+ node_editor_add(editor, "Source", nk_rect(40, 10, 180, 220), nk_rgb(255, 0, 0), 0, 1);
+ node_editor_add(editor, "Source", nk_rect(40, 260, 180, 220), nk_rgb(0, 255, 0), 0, 1);
+ node_editor_add(editor, "Combine", nk_rect(400, 100, 180, 220), nk_rgb(0,0,255), 2, 2);
+ node_editor_link(editor, 0, 0, 2, 0);
+ node_editor_link(editor, 1, 0, 2, 1);
+ editor->show_grid = nk_true;
+}
+
+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);
+
+ 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 */
+ struct nk_panel *node;
+ 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");
+}
+