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eeshow/gui/: change zoom system to use float; reduce step from 2 to 2^(1/3)

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This commit is contained in:
Werner Almesberger 2016-08-22 06:41:03 -03:00
parent a1106b0985
commit 0550b016ee
5 changed files with 39 additions and 21 deletions
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2
eeshow/gui/common.h
View File

@ -65,7 +65,7 @@ struct gui_hist {
struct gui_ctx {
GtkWidget *da;
unsigned zoom; /* scale by 1.0 / (1 << zoom) */
float scale; /* pixels = eeschema * scale */
int x, y; /* center, in eeschema coordinates */
struct pl_ctx *pl; // @@@

4
eeshow/gui/glabel.c
View File

@ -49,8 +49,8 @@ static void eeschema_coord(const struct gui_ctx *ctx,
GtkAllocation alloc;
gtk_widget_get_allocation(ctx->da, &alloc);
*rx = ((x - ctx->x) >> ctx->zoom) + alloc.width / 2;
*ry = ((y - ctx->y) >> ctx->zoom) + alloc.height / 2;
*rx = ((x - ctx->x) * ctx->scale) + alloc.width / 2;
*ry = ((y - ctx->y) * ctx->scale) + alloc.height / 2;
}

2
eeshow/gui/gui.c
View File

@ -389,7 +389,7 @@ int gui(unsigned n_args, char **args, bool recurse, int limit,
GtkWidget *window;
char *title;
struct gui_ctx ctx = {
.zoom = 4, /* scale by 1 / 16 */
.scale = 1 / 16.0,
.pl = pl, // @@@
.hist = NULL,
.vcs_hist = NULL,

4
eeshow/gui/render.c
View File

@ -158,7 +158,7 @@ static void hack(const struct gui_ctx *ctx, cairo_t *cr,
struct area *areas = NULL;
areas = changed_sheets(ctx, xo, yo, f);
diff_to_canvas(cr, ctx->x, ctx->y, 1.0 / (1 << ctx->zoom),
diff_to_canvas(cr, ctx->x, ctx->y, ctx->scale,
old->gfx_ctx, new->gfx_ctx, areas);
free_areas(&areas);
}
@ -170,7 +170,7 @@ static gboolean on_draw_event(GtkWidget *widget, cairo_t *cr,
const struct gui_ctx *ctx = user_data;
const struct gui_sheet *sheet = ctx->curr_sheet;
GtkAllocation alloc;
float f = 1.0 / (1 << ctx->zoom);
float f = ctx->scale;
int x, y;
gtk_widget_get_allocation(ctx->da, &alloc);

48
eeshow/gui/sheet.c
View File

@ -29,6 +29,12 @@
#include "gui/common.h"
#define ZOOM_FACTOR 1.26 /* 2^(1/3) */
#define ZOOM_MAX 1
#define ZOOM_MIN_SIZE 16
#define ZOOM_MARGIN 0.95
/* ----- Tools ------------------------------------------------------------- */
@ -41,8 +47,8 @@ static void canvas_coord(const struct gui_ctx *ctx,
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;
*x = sx / ctx->scale + ctx->x;
*y = sy / ctx->scale + ctx->y;
}
@ -51,11 +57,15 @@ static void canvas_coord(const struct gui_ctx *ctx,
static bool zoom_in(struct gui_ctx *ctx, int x, int y)
{
if (ctx->zoom == 0)
float old = ctx->scale;
if (ctx->scale == ZOOM_MAX)
return 0;
ctx->zoom--;
ctx->x = (ctx->x + x) / 2;
ctx->y = (ctx->y + y) / 2;
ctx->scale *= ZOOM_FACTOR;
if (ctx->scale > ZOOM_MAX)
ctx->scale = ZOOM_MAX;
ctx->x = x + (ctx->x - x) * old / ctx->scale;
ctx->y = y + (ctx->y - y) * old / ctx->scale;
redraw(ctx);
return 1;
}
@ -63,11 +73,17 @@ static bool zoom_in(struct gui_ctx *ctx, int x, int y)
static bool zoom_out(struct gui_ctx *ctx, int x, int y)
{
if (ctx->curr_sheet->w >> ctx->zoom <= 16)
float old = ctx->scale;
if (ctx->curr_sheet->w * ctx->scale <= ZOOM_MIN_SIZE)
return 0;
ctx->zoom++;
ctx->x = 2 * ctx->x - x;
ctx->y = 2 * ctx->y - y;
ctx->scale /= ZOOM_FACTOR;
if (ctx->curr_sheet->w <= ZOOM_MIN_SIZE)
ctx->scale = 1;
else if (ctx->curr_sheet->w * ctx->scale <= ZOOM_MIN_SIZE )
ctx->scale = (float) ZOOM_MIN_SIZE / ctx->curr_sheet->w;
ctx->x = x + (ctx->x - x) * old / ctx->scale;
ctx->y = y + (ctx->y - y) * old / ctx->scale;
redraw(ctx);
return 1;
}
@ -106,15 +122,17 @@ static void zoom_to_extents(struct gui_ctx *ctx)
{
GtkAllocation alloc;
int w, h;
float sw, sh;
curr_sheet_size(ctx, &w, &h);
ctx->x = w / 2;
ctx->y = h / 2;
gtk_widget_get_allocation(ctx->da, &alloc);
ctx->zoom = 0;
while (w >> ctx->zoom > alloc.width || h >> ctx->zoom > alloc.height)
ctx->zoom++;
sw = w ? (float) ZOOM_MARGIN * alloc.width / w : 1;
sh = h ? (float) ZOOM_MARGIN * alloc.height / h : 1;
ctx->scale = sw < sh ? sw : sh;
redraw(ctx);
}
@ -439,8 +457,8 @@ static void sheet_drag_move(void *user, int dx, int dy)
{
struct gui_ctx *ctx = user;
ctx->x -= dx << ctx->zoom;
ctx->y -= dy << ctx->zoom;
ctx->x -= dx / ctx->scale;
ctx->y -= dy / ctx->scale;
redraw(ctx);
}