/* * gui.c - GUI for eeshow * * Written 2016 by Werner Almesberger * Copyright 2016 by Werner Almesberger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ /* * Resources: * * http://zetcode.com/gfx/cairo/cairobackends/ * https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html */ #include #include #include "cro.h" #include "gfx.h" #include "sch.h" #include "gui.h" struct gui_ctx { GtkWidget *da; const struct sch_ctx *sch; struct cro_ctx *gfx_ctx; int w, h; int xmin, ymin; unsigned zoom; /* scale by 1.0 / (1 << zoom) */ int x, y; /* center, in eeschema coordinates */ bool panning; int pan_x, pan_y; } gui_ctx; /* ----- Rendering --------------------------------------------------------- */ static gboolean on_draw_event(GtkWidget *widget, cairo_t *cr, gpointer user_data) { const struct gui_ctx *ctx = user_data; GtkAllocation alloc; float f = 1.0 / (1 << ctx->zoom); int x, y; gtk_widget_get_allocation(ctx->da, &alloc); // x = -(ctx->xo - ctx->w / 2) * f - (ctx->x - alloc.width / 2); // y = -(ctx->yo - ctx->h / 2) * f - (ctx->y - alloc.height / 2); x = -(ctx->xmin + ctx->x) * f + alloc.width / 2; y = -(ctx->ymin + ctx->y) * f + alloc.height / 2; cro_canvas_draw(ctx->gfx_ctx, cr, x, y, f); return FALSE; } static void render(struct gui_ctx *ctx) { char *argv[] = { "gui", NULL }; gfx_init(&cro_canvas_ops, 1, argv); sch_render(ctx->sch->sheets); cro_canvas_end(gfx_ctx, &ctx->w, &ctx->h, &ctx->xmin, &ctx->ymin); ctx->gfx_ctx = gfx_ctx; ctx->x = ctx->w >> 1; ctx->y = ctx->h >> 1; // gfx_end(); } /* ----- Tools ------------------------------------------------------------- */ static void canvas_coord(const struct gui_ctx *ctx, int ex, int ey, int *x, int *y) { int sx, sy; GtkAllocation alloc; gtk_widget_get_allocation(ctx->da, &alloc); sx = ex - alloc.width / 2; sy = ey - alloc.height / 2; *x = (sx << ctx->zoom) + ctx->x; *y = (sy << ctx->zoom) + ctx->y; } /* ----- Panning ----------------------------------------------------------- */ static void pan_begin(struct gui_ctx *ctx, int x, int y) { if (ctx->panning) return; ctx->panning = 1; ctx->pan_x = x; ctx->pan_y = y; } static void pan_update(struct gui_ctx *ctx, int x, int y) { if (!ctx->panning) return; ctx->x -= (x - ctx->pan_x) << ctx->zoom; ctx->y -= (y - ctx->pan_y) << ctx->zoom; ctx->pan_x = x; ctx->pan_y = y; gtk_widget_queue_draw(ctx->da); } static void pan_end(struct gui_ctx *ctx, int x, int y) { pan_update(ctx, x, y); ctx->panning = 0; } /* ----- Zoom -------------------------------------------------------------- */ static void zoom_in(struct gui_ctx *ctx, int x, int y) { if (ctx->zoom == 0) return; ctx->zoom--; ctx->x = (ctx->x + x) / 2; ctx->y = (ctx->y + y) / 2; gtk_widget_queue_draw(ctx->da); } static void zoom_out(struct gui_ctx *ctx, int x, int y) { if (ctx->w >> ctx->zoom <= 16) return; ctx->zoom++; ctx->x = 2 * ctx->x - x; ctx->y = 2 * ctx->y - y; gtk_widget_queue_draw(ctx->da); } /* ----- Event handlers ---------------------------------------------------- */ static gboolean motion_notify_event(GtkWidget *widget, GdkEventMotion *event, gpointer data) { struct gui_ctx *ctx = data; int x, y; canvas_coord(ctx, event->x, event->y, &x, &y); // fprintf(stderr, "motion\n"); pan_update(ctx, event->x, event->y); return TRUE; } static gboolean button_press_event(GtkWidget *widget, GdkEventButton *event, gpointer data) { struct gui_ctx *ctx = data; int x, y; canvas_coord(ctx, event->x, event->y, &x, &y); fprintf(stderr, "button press\n"); switch (event->button) { case 1: break; case 2: pan_begin(ctx, event->x, event->y); break; case 3: break; } return TRUE; } static gboolean button_release_event(GtkWidget *widget, GdkEventButton *event, gpointer data) { struct gui_ctx *ctx = data; int x, y; canvas_coord(ctx, event->x, event->y, &x, &y); fprintf(stderr, "button release\n"); switch (event->button) { case 1: break; case 2: pan_end(ctx, event->x, event->y); break; case 3: break; } return TRUE; } static gboolean key_press_event(GtkWidget *widget, GdkEventKey *event, gpointer data) { fprintf(stderr, "key %d\n", event->keyval); switch (event->keyval) { case GDK_KEY_q: gtk_main_quit(); } return TRUE; } static gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event, gpointer data) { struct gui_ctx *ctx = data; int x, y; canvas_coord(ctx, event->x, event->y, &x, &y); switch (event->direction) { case GDK_SCROLL_UP: zoom_in(ctx, x, y); break; case GDK_SCROLL_DOWN: zoom_out(ctx, x, y); break; default: /* ignore */; } return TRUE; } /* ----- Initialization ---------------------------------------------------- */ int gui(struct sch_ctx *sch) { GtkWidget *window; struct gui_ctx ctx = { .sch = sch, .zoom = 4, /* scale by 1 / 16 */ .panning = 0, }; render(&ctx); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); ctx.da = gtk_drawing_area_new(); gtk_container_add(GTK_CONTAINER(window), ctx.da); g_signal_connect(G_OBJECT(ctx.da), "draw", G_CALLBACK(on_draw_event), &ctx); g_signal_connect(G_OBJECT(ctx.da), "motion_notify_event", G_CALLBACK(motion_notify_event), &ctx); g_signal_connect(G_OBJECT(ctx.da), "button_press_event", G_CALLBACK(button_press_event), &ctx); g_signal_connect(G_OBJECT(ctx.da), "button_release_event", G_CALLBACK(button_release_event), &ctx); g_signal_connect(G_OBJECT(ctx.da), "scroll_event", G_CALLBACK(scroll_event), &ctx); g_signal_connect(G_OBJECT(ctx.da), "key_press_event", G_CALLBACK(key_press_event), &ctx); g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL); gtk_widget_set_can_focus(ctx.da, TRUE); gtk_widget_set_events(ctx.da, GDK_EXPOSE | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_SCROLL_MASK | GDK_POINTER_MOTION_MASK); // gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER); // gtk_window_set_default_size(GTK_WINDOW(window), 400, 90); gtk_window_set_title(GTK_WINDOW(window), "eeshow"); gtk_widget_show_all(window); gtk_main(); return 0; }