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