Merge branch 'dev'

* Cairo version: 1.16.0-1
* SVG output doens't seem as broken as before with the current cairo version
* Transparency doesn't work. Transparent layers aren't rendered at all.

gds-parser/gds-parser.c

@@ -48,11 +48,17 @@
 #include <math.h>
 #include <cairo.h>
 
+/**
+ * @brief Default units assumed for library.
+ * @note This value is usually overwritten with the value defined in the library.
+ */
+#define GDS_DEFAULT_UNITS (10E-9)
+
 #define GDS_ERROR(fmt, ...) printf("[PARSE_ERROR] " fmt "\n", ##__VA_ARGS__) /**< @brief Print GDS error*/
 #define GDS_WARN(fmt, ...) printf("[PARSE_WARNING] " fmt "\n", ##__VA_ARGS__) /**< @brief Print GDS warning */
 
 #if GDS_PRINT_DEBUG_INFOS
-	#define GDS_INF(fmt, ...) printf(fmt, ##__VA_ARGS__) /**< @brief standard printf. But cna be disabled in code */
+	#define GDS_INF(fmt, ...) printf(fmt, ##__VA_ARGS__) /**< @brief standard printf. But can be disabled in code */
 #else
 	#define GDS_INF(fmt, ...)
 #endif
@@ -221,7 +227,7 @@ static GList *append_library(GList *curr_list, struct gds_library **library_ptr)
 	if (lib) {
 		lib->cells = NULL;
 		lib->name[0] = 0;
-		lib->unit_to_meters = 1; // Default. Will be overwritten
+		lib->unit_in_meters = GDS_DEFAULT_UNITS; // Default. Will be overwritten
 		lib->cell_names = NULL;
 	} else
 		return NULL;
@@ -297,6 +303,7 @@ static GList *append_cell(GList *curr_list, struct gds_cell **cell_ptr)
 		cell->child_cells = NULL;
 		cell->graphic_objs = NULL;
 		cell->name[0] = 0;
+		cell->parent_library = NULL;
 	} else
 		return NULL;
 	/* return cell */
@@ -383,7 +390,7 @@ static int name_cell(struct gds_cell *cell, unsigned int bytes,
 		return -1;
 	}
 	data[bytes] = 0; // Append '0'
-	len = strlen(data);
+	len = (int)strlen(data);
 	if (len > CELL_NAME_MAX-1) {
 		GDS_ERROR("Cell name '%s' too long: %d\n", data, len);
 		return -1;
@@ -458,6 +465,7 @@ static void scan_cell_reference_dependencies(gpointer gcell, gpointer library)
 static void scan_library_references(gpointer library_list_item, gpointer user)
 {
 	struct gds_library *lib = (struct gds_library *)library_list_item;
+	(void)user;
 
 	GDS_INF("Scanning Library: %s\n", lib->name);
 	g_list_foreach(lib->cells, scan_cell_reference_dependencies, lib);
@@ -607,12 +615,20 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 			GDS_INF("Leaving Library\n");
 			break;
 		case BGNSTR:
+			if (current_lib == NULL) {
+				GDS_ERROR("Defining Cell outside of library!\n");
+				run = -4;
+				break;
+			}
 			current_lib->cells = append_cell(current_lib->cells, &current_cell);
 			if (current_lib->cells == NULL) {
 				GDS_ERROR("Allocating memory failed");
 				run = -3;
 				break;
 			}
+
+			current_cell->parent_library = current_lib;
+
 			GDS_INF("Entering Cell\n");
 			break;
 		case ENDSTR:
@@ -710,6 +726,8 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 			break;
 		case PATHTYPE:
 			break;
+		case UNITS:
+			break;
 		default:
 			//GDS_WARN("Record: %04x, len: %u", (unsigned int)rec_type, (unsigned int)rec_data_length);
 			break;
@@ -717,7 +735,7 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 
 
 		/* No Data -> No Processing, go back to top */
-		if (!rec_data_length) continue;
+		if (!rec_data_length || run != 1) continue;
 
 		read = fread(workbuff, sizeof(char), rec_data_length, gds_file);
 
@@ -731,7 +749,6 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 		switch (rec_type) {
 
 		case HEADER:
-		case UNITS:
 		case ENDLIB:
 		case ENDSTR:
 		case BOUNDARY:
@@ -742,6 +759,20 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 		case INVALID:
 			break;
 
+		case UNITS:
+			if (!current_lib) {
+				GDS_WARN("Units defined outside of library!\n");
+				break;
+			}
+
+			if (rec_data_length != 16) {
+				GDS_WARN("Unit define incomplete. Will assume database unit of %E meters\n", current_lib->unit_in_meters);
+				break;
+			}
+
+			current_lib->unit_in_meters = gds_convert_double(&workbuff[8]);
+			GDS_INF("Length of database unit: %E meters\n", current_lib->unit_in_meters);
+			break;
 		case BGNLIB:
 			/* Parse date record */
 			gds_parse_date(workbuff, read, &current_lib->mod_time, &current_lib->access_time);
@@ -848,15 +879,11 @@ int parse_gds_from_file(const char *filename, GList **library_list)
 
 	fclose(gds_file);
 
-
 	if (!run) {
 		/* Iterate and find references to cells */
 		g_list_foreach(lib_list, scan_library_references, NULL);
 	}
 
-
-
-
 	*library_list = lib_list;
 
 	free(workbuff);

gds-parser/gds-types.h

@@ -104,6 +104,7 @@ struct gds_cell {
 	struct gds_time_field access_time;
 	GList *child_cells; /**< @brief List of #gds_cell_instance elements */
 	GList *graphic_objs; /**< @brief List of #gds_graphics */
+	struct gds_library *parent_library; /**< @brief Pointer to parent library */
 };
 
 /**
@@ -113,7 +114,7 @@ struct gds_library {
 	char name[CELL_NAME_MAX];
 	struct gds_time_field mod_time;
 	struct gds_time_field access_time;
-	double unit_to_meters;  /**< @warning not yet implemented */
+	double unit_in_meters;  /**< Length of a database unit in meters */
 	GList *cells; /**< List of #gds_cell that contains all cells in this library*/
 	GList *cell_names /**< List of strings that contains all cell names */;
 };

glade/dialog.glade

@@ -4,7 +4,7 @@
   <requires lib="gtk+" version="3.20"/>
   <object class="GtkAdjustment" id="adjustment1">
     <property name="lower">1</property>
-    <property name="upper">3000</property>
+    <property name="upper">4000</property>
     <property name="value">1000</property>
     <property name="step_increment">10</property>
     <property name="page_increment">1000</property>
@@ -51,7 +51,6 @@
         <property name="label" translatable="yes">Render SVG using Cairographics (too buggy at the moment)</property>
         <property name="use_action_appearance">True</property>
         <property name="visible">True</property>
-        <property name="sensitive">False</property>
         <property name="can_focus">True</property>
         <property name="receives_default">False</property>
         <property name="active">True</property>
@@ -69,6 +68,7 @@
         <property name="visible">True</property>
         <property name="can_focus">True</property>
         <property name="adjustment">adjustment1</property>
+        <property name="fill_level">4000</property>
         <property name="round_digits">0</property>
         <property name="digits">0</property>
       </object>
@@ -106,5 +106,83 @@
         <property name="position">5</property>
       </packing>
     </child>
+    <child>
+      <object class="GtkDrawingArea" id="shape-drawer">
+        <property name="height_request">200</property>
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+      </object>
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
+        <property name="position">6</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <child>
+          <object class="GtkLabel" id="x-label">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkLabel" id="y-label">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">7</property>
+      </packing>
+    </child>
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <child>
+          <object class="GtkLabel" id="x-output-label">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkLabel" id="y-output-label">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">8</property>
+      </packing>
+    </child>
   </object>
 </interface>

main-window.c

@@ -36,6 +36,7 @@
 #include "latex-output/latex-output.h"
 #include "widgets/conv-settings-dialog.h"
 #include "cairo-output/cairo-output.h"
+#include "trigonometric/cell-trigonometrics.h"
 
 /**
  * @brief User data supplied to callback function of the open button
@@ -214,7 +215,7 @@ end_destroy:
 static void on_convert_clicked(gpointer button, gpointer user)
 {
 	static struct render_settings sett = {
-		.scale = 1000.0f,
+		.scale = 1000.0,
 		.renderer = RENDERER_LATEX_TIKZ,
 	};
 	struct convert_button_data *data = (struct convert_button_data *)user;
@@ -229,6 +230,8 @@ static void on_convert_clicked(gpointer button, gpointer user)
 	GtkFileFilter *filter;
 	gint res;
 	char *file_name;
+	union bounding_box cell_box;
+	double height, width;
 
 	/* Get selected cell */
 	selection = gtk_tree_view_get_selection(data->tree_view);
@@ -243,8 +246,21 @@ static void on_convert_clicked(gpointer button, gpointer user)
 	/* Get layers that are rendered */
 	layer_list = export_rendered_layer_info();
 
+	/* Calculate cell size in DB units */
+	bounding_box_prepare_empty(&cell_box);
+	calculate_cell_bounding_box(&cell_box, cell_to_render);
+
+	/* Calculate size in meters database units */
+	height = (cell_box.vectors.upper_right.y - cell_box.vectors.lower_left.y);
+	width = (cell_box.vectors.upper_right.x - cell_box.vectors.lower_left.x);
+
+	/* Show settings dialog */
 	settings = renderer_settings_dialog_new(GTK_WINDOW(data->main_window));
 	renderer_settings_dialog_set_settings(settings, &sett);
+	renderer_settings_dialog_set_database_unit_scale(settings, cell_to_render->parent_library->unit_in_meters);
+	renderer_settings_dialog_set_cell_height(settings, height);
+	renderer_settings_dialog_set_cell_width(settings, width);
+
 	res = gtk_dialog_run(GTK_DIALOG(settings));
 	if (res == GTK_RESPONSE_OK) {
 		renderer_settings_dialog_get_settings(settings, &sett);
@@ -254,8 +270,6 @@ static void on_convert_clicked(gpointer button, gpointer user)
 		goto ret_layer_destroy;
 	}
 
-
-
 	/* save file dialog */
 	dialog = gtk_file_chooser_dialog_new((sett.renderer == RENDERER_LATEX_TIKZ
 					      ? "Save LaTeX File" : "Save PDF"),

main.c

@@ -100,7 +100,6 @@ static int start_gui(int argc, char **argv)
 	g_object_unref(m_about);
 	g_object_unref(menu);
 
-
 	app_status = g_application_run(G_APPLICATION(gapp), argc, argv);
 	g_object_unref(gapp);
 
@@ -189,6 +188,5 @@ int main(int argc, char **argv)
 		app_status = start_gui(argc, argv);
 	}
 
-
 	return app_status;
 }

trigonometric/bounding-box.c

@@ -133,14 +133,70 @@ static void calculate_path_miter_points(struct vector_2d *a, struct vector_2d *b
 	vector_2d_subtract(m2, m2, &v_vec);
 }
 
-void bounding_box_calculate_path_box(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
+void bounding_box_calculate_path_box(GList *vertices, double thickness,
+					conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
 {
+	GList *vertex_iterator;
+	struct vector_2d pt;
 
+	printf("Warning! Function bounding_box_calculate_path_box not yet implemented correctly!\n");
+
+	if (!vertices || !box)
+		return;
+
+	for (vertex_iterator = vertices; vertex_iterator != NULL; vertex_iterator = g_list_next(vertex_iterator)) {
+
+		if (conv_func != NULL)
+			conv_func(vertex_iterator->data, &pt);
+		else
+			(void)vector_2d_copy(&pt, (struct vector_2d *)vertex_iterator->data);
+
+		/* These are approximations.
+		 * Used as long as miter point calculation is not fully implemented
+		 */
+		box->vectors.lower_left.x = MIN(box->vectors.lower_left.x, pt.x - thickness/2);
+		box->vectors.lower_left.y = MIN(box->vectors.lower_left.y, pt.y - thickness/2);
+		box->vectors.upper_right.x = MAX(box->vectors.upper_right.x, pt.x + thickness/2);
+		box->vectors.upper_right.y = MAX(box->vectors.upper_right.y, pt.y + thickness/2);
+	}
 }
 
 void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt)
 {
+	struct vector_2d point;
 
+	if (!destination || !pt)
+		return;
+
+	if (conv_func)
+		conv_func(pt, &point);
+	else
+		(void)vector_2d_copy(&point, (struct vector_2d *)pt);
+
+	destination->vectors.lower_left.x = MIN(destination->vectors.lower_left.x, point.x);
+	destination->vectors.lower_left.y = MIN(destination->vectors.lower_left.y, point.y);
+	destination->vectors.upper_right.x = MAX(destination->vectors.upper_right.x, point.x);
+	destination->vectors.upper_right.y = MAX(destination->vectors.upper_right.y, point.y);
+}
+
+/**
+ * @brief bounding_box_apply_transform
+ * @param scale scaling factor
+ * @param rotation roation of bounding box around the origin in degrees (counterclockwise)
+ * @param box bounding box the operations should be applied to
+ */
+void bounding_box_apply_transform(double scale, double rotation_deg, bool flip_at_x, union bounding_box *box)
+{
+	int i;
+
+	/* Due to linearity, the order of the operations does not matter.
+	 * flip must be applied before rotation as defined by the GDS format
+	 */
+	for (i = 0; i < 2; i++) {
+		box->vector_array[i].y *= (flip_at_x ? -1 : 1);
+		vector_2d_rotate(&box->vector_array[i], rotation_deg * M_PI / 180);
+		vector_2d_scale(&box->vector_array[i], scale);
+	}
 }
 
 /** @} */

trigonometric/bounding-box.h

@@ -32,6 +32,7 @@
 #define _BOUNDING_BOX_H_
 #include <glib.h>
 #include "vector-operations.h"
+#include <stdbool.h>
 
 union bounding_box {
 	/** Coordinate System is (y up | x right) */
@@ -48,6 +49,8 @@ void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t
 void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
 void bounding_box_prepare_empty(union bounding_box *box);
 void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt);
+void bounding_box_apply_transform(double scale, double rotation_deg, bool flip_at_x, union bounding_box *box);
+void bounding_box_calculate_path_box(GList *vertices, double thickness, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
 
 #endif /* _BOUNDING_BOX_H_ */
 

trigonometric/cell-trigonometrics.c

@@ -0,0 +1,117 @@
+/*
+ * GDSII-Converter
+ * Copyright (C) 2018  Mario Hüttel <mario.huettel@gmx.net>
+ *
+ * This file is part of GDSII-Converter.
+ *
+ * GDSII-Converter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * GDSII-Converter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GDSII-Converter.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file cell-trigonometrics.c
+ * @brief Calculation of gds_cell trigonometrics
+ * @author Mario Hüttel <mario.huettel@gmx.net>
+ */
+
+#include "cell-trigonometrics.h"
+#include <math.h>
+
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
+static void convert_gds_point_to_2d_vector(struct gds_point *pt, struct vector_2d *vector)
+{
+	vector->x = pt->x;
+	vector->y = pt->y;
+}
+
+/**
+ * @brief update_box_with_gfx
+ * @param box
+ * @param gfx_list
+ */
+static void update_box_with_gfx(union bounding_box *box, struct gds_graphics *gfx)
+{
+	union bounding_box current_box;
+
+	bounding_box_prepare_empty(&current_box);
+
+	switch (gfx->gfx_type) {
+	case GRAPHIC_BOX:
+		/* Expected fallthrough */
+	case GRAPHIC_POLYGON:
+		bounding_box_calculate_polygon(gfx->vertices,
+							(conv_generic_to_vector_2d_t)&convert_gds_point_to_2d_vector,
+							&current_box);
+		break;
+	case GRAPHIC_PATH:
+		/*
+		 * This is not implemented correctly.
+		 * Please be aware if paths are the outmost elements of your cell.
+		 * You might end up with a completely wrong calculated cell size.
+		 */
+		bounding_box_calculate_path_box(gfx->vertices, gfx->width_absolute,
+							(conv_generic_to_vector_2d_t)&convert_gds_point_to_2d_vector,
+							&current_box);
+		break;
+	default:
+		/* Unknown graphics object. */
+		/* Print error? Nah.. */
+		break;
+	}
+
+	/* Update box with results */
+	bounding_box_update_box(box, &current_box);
+}
+
+void calculate_cell_bounding_box(union bounding_box *box, struct gds_cell *cell)
+{
+	GList *gfx_list;
+	struct gds_graphics *gfx;
+	GList *sub_cell_list;
+	struct gds_cell_instance *sub_cell;
+	union bounding_box temp_box;
+
+	if (!box || !cell)
+		return;
+
+	/* Update box with graphic elements */
+	for (gfx_list = cell->graphic_objs; gfx_list != NULL; gfx_list = gfx_list->next) {
+		gfx = (struct gds_graphics *)gfx_list->data;
+		update_box_with_gfx(box, gfx);
+	}
+
+	/* Update bounding box with boxes of subcells */
+	for (sub_cell_list = cell->child_cells; sub_cell_list != NULL; sub_cell_list = sub_cell_list->next) {
+		sub_cell = (struct gds_cell_instance *)sub_cell_list->data;
+		bounding_box_prepare_empty(&temp_box);
+		/* Recursion Woohoo!!  This dies if your GDS is faulty and contains a reference loop */
+		calculate_cell_bounding_box(&temp_box, sub_cell->cell_ref);
+
+		/* Apply transformations */
+		bounding_box_apply_transform(ABS(sub_cell->magnification), sub_cell->angle, sub_cell->flipped, &temp_box);
+
+		/* Move bounding box to origin */
+		temp_box.vectors.lower_left.x += sub_cell->origin.x;
+		temp_box.vectors.upper_right.x += sub_cell->origin.x;
+		temp_box.vectors.lower_left.y += sub_cell->origin.y;
+		temp_box.vectors.upper_right.y += sub_cell->origin.y;
+
+		/* update the parent's box */
+		bounding_box_update_box(box, &temp_box);
+	}
+}
+
+/** @} */

trigonometric/cell-trigonometrics.h

@@ -0,0 +1,47 @@
+/*
+ * GDSII-Converter
+ * Copyright (C) 2018  Mario Hüttel <mario.huettel@gmx.net>
+ *
+ * This file is part of GDSII-Converter.
+ *
+ * GDSII-Converter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * GDSII-Converter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GDSII-Converter.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file cell-trigonometrics.h
+ * @brief Calculation of gds_cell trigonometrics
+ * @author Mario Hüttel <mario.huettel@gmx.net>
+ */
+
+/**
+ * @addtogroup trigonometric
+ * @{
+ */
+
+#ifndef _CELL_TRIGONOMETRICS_H_
+#define _CELL_TRIGONOMETRICS_H_
+
+#include "bounding-box.h"
+#include "../gds-parser/gds-types.h"
+
+/**
+ * @brief calculate_cell_bounding_box Calculate bounding box of gds cell
+ * @param box Resulting boundig box. Will be uüdated and not overwritten
+ * @param cell toplevel cell
+ * @warning Path handling not yet implemented correctly
+ */
+void calculate_cell_bounding_box(union bounding_box *box, struct gds_cell *cell);
+
+#endif /* _CELL_TRIGONOMETRICS_H_ */
+
+/** @} */

trigonometric/vector-operations.c

@@ -76,19 +76,18 @@ struct vector_2d *vector_2d_copy(struct vector_2d *opt_res, struct vector_2d *ve
 
 	if (!vec)
 		return NULL;
-	if (opt_res) {
-		opt_res->x = vec->x;
-		opt_res->y = vec->y;
-		return opt_res;
-	} else {
+
+	if (opt_res)
+		res = opt_res;
+	else
 		res = vector_2d_alloc();
+
 	if (res) {
 		res->x = vec->x;
 		res->y = vec->y;
 	}
 		return res;
 }
-}
 
 struct vector_2d *vector_2d_alloc(void)
 {

widgets/conv-settings-dialog.c

@@ -39,12 +39,20 @@ struct  _RendererSettingsDialog {
 		GtkWidget *scale;
 		GtkWidget *layer_check;
 		GtkWidget *standalone_check;
+		GtkDrawingArea *shape_drawing;
+		GtkLabel *x_label;
+		GtkLabel *y_label;
+
+		GtkLabel *x_output_label;
+		GtkLabel *y_output_label;
+
+		unsigned int cell_height;
+		unsigned int cell_width;
+		double unit_in_meters;
 };
 
 G_DEFINE_TYPE(RendererSettingsDialog, renderer_settings_dialog, GTK_TYPE_DIALOG)
 
-
-
 static void renderer_settings_dialog_class_init(RendererSettingsDialogClass *klass)
 {
 	/*  No special code needed. Child cells are destroyed automatically due to reference counter */
@@ -72,13 +80,89 @@ static void latex_render_callback(GtkToggleButton *radio, RendererSettingsDialog
 		hide_tex_options(dialog);
 }
 
+static gboolean shape_drawer_drawing_callback(GtkWidget *widget, cairo_t *cr, gpointer data)
+{
+	int width;
+	int height;
+	GtkStyleContext *style_context;
+	GdkRGBA foreground_color;
+	RendererSettingsDialog *dialog = (RendererSettingsDialog *)data;
+	double usable_width;
+	double usable_height;
+	double height_scale;
+	double width_scale;
+	double final_scale_value;
+
+	style_context = gtk_widget_get_style_context(widget);
+	width = gtk_widget_get_allocated_width(widget);
+	height = gtk_widget_get_allocated_height(widget);
+
+	gtk_render_background(style_context, cr, 0, 0, width, height);
+
+	gtk_style_context_get_color(style_context, gtk_style_context_get_state(style_context),
+					&foreground_color);
+
+	gdk_cairo_set_source_rgba(cr, &foreground_color);
+
+	cairo_save(cr);
+
+	/* Tranform coordiante system */
+	cairo_scale(cr, 1, -1);
+	cairo_translate(cr, (double)width/2.0, -(double)height/2.0);
+
+	/* Define usable drawing area */
+	usable_width = (0.95*(double)width) - 15.0;
+	usable_height = (0.95*(double)height) - 15.0;
+
+	width_scale = usable_width/(double)dialog->cell_width;
+	height_scale = usable_height/(double)dialog->cell_height;
+
+	final_scale_value = (width_scale < height_scale ? width_scale : height_scale);
+
+	cairo_rectangle(cr, -(double)dialog->cell_width*final_scale_value/2.0, -(double)dialog->cell_height*final_scale_value/2.0,
+			(double)dialog->cell_width*final_scale_value, (double)dialog->cell_height*final_scale_value);
+	cairo_stroke(cr);
+	cairo_restore(cr);
+
+	return FALSE;
+}
+
+static void renderer_settings_dialog_update_labels(RendererSettingsDialog *self)
+{
+	char default_buff[100];
+	double scale;
+
+	if (!self)
+		return;
+
+	snprintf(default_buff, sizeof(default_buff), "Width: %E", self->cell_width * self->unit_in_meters);
+	gtk_label_set_text(self->x_label, default_buff);
+	snprintf(default_buff, sizeof(default_buff), "Height: %E", self->cell_height * self->unit_in_meters);
+	gtk_label_set_text(self->y_label, default_buff);
+
+	scale = gtk_range_get_value(GTK_RANGE(self->scale));
+
+	snprintf(default_buff, sizeof(default_buff), "Output Width: %u px", (unsigned int)((double)self->cell_width / scale));
+	gtk_label_set_text(self->x_output_label, default_buff);
+	snprintf(default_buff, sizeof(default_buff), "Output Height: %u px", (unsigned int)((double)self->cell_height / scale));
+	gtk_label_set_text(self->y_output_label, default_buff);
+}
+
+static void scale_value_changed(GtkRange *range, gpointer user_data)
+{
+	(void)range;
+	RendererSettingsDialog *dialog;
+
+	dialog = RENDERER_SETTINGS_DIALOG(user_data);
+	renderer_settings_dialog_update_labels(dialog);
+}
+
 static void renderer_settings_dialog_init(RendererSettingsDialog *self)
 {
 	GtkBuilder *builder;
 	GtkWidget *box;
 	GtkDialog *dialog;
 
-
 	dialog = &(self->parent);
 
 	builder = gtk_builder_new_from_resource("/dialog.glade");
@@ -89,12 +173,27 @@ static void renderer_settings_dialog_init(RendererSettingsDialog *self)
 	self->scale = GTK_WIDGET(gtk_builder_get_object(builder, "dialog-scale"));
 	self->standalone_check = GTK_WIDGET(gtk_builder_get_object(builder, "standalone-check"));
 	self->layer_check = GTK_WIDGET(gtk_builder_get_object(builder, "layer-check"));
+	self->shape_drawing = GTK_DRAWING_AREA(gtk_builder_get_object(builder, "shape-drawer"));
+	self->x_label = GTK_LABEL(gtk_builder_get_object(builder, "x-label"));
+	self->y_label = GTK_LABEL(gtk_builder_get_object(builder, "y-label"));
+	self->x_output_label = GTK_LABEL(gtk_builder_get_object(builder, "x-output-label"));
+	self->y_output_label = GTK_LABEL(gtk_builder_get_object(builder, "y-output-label"));
 
 	gtk_dialog_add_buttons(dialog, "Cancel", GTK_RESPONSE_CANCEL, "OK", GTK_RESPONSE_OK, NULL);
 	gtk_container_add(GTK_CONTAINER(gtk_dialog_get_content_area(dialog)), box);
 	gtk_window_set_title(GTK_WINDOW(self), "Renderer Settings");
 
 	g_signal_connect(self->radio_latex, "toggled", G_CALLBACK(latex_render_callback), (gpointer)self);
+	g_signal_connect(G_OBJECT(self->shape_drawing),
+				"draw", G_CALLBACK(shape_drawer_drawing_callback), (gpointer)self);
+
+	g_signal_connect(self->scale, "value-changed", G_CALLBACK(scale_value_changed), (gpointer)self);
+
+	/* Default values */
+	self->cell_width = 1;
+	self->cell_height = 1;
+	self->unit_in_meters = 1E-6;
+	renderer_settings_dialog_update_labels(self);
 
 	g_object_unref(builder);
 }
@@ -155,9 +254,44 @@ void renderer_settings_dialog_set_settings(RendererSettingsDialog *dialog, struc
 		hide_tex_options(dialog);
 		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(dialog->radio_cairo_svg), TRUE);
 		break;
-
-
 	}
 }
 
+void renderer_settings_dialog_set_cell_width(RendererSettingsDialog *dialog, unsigned int width)
+{
+	if (!dialog)
+		return;
+
+	if (width == 0)
+		width = 1;
+
+
+	dialog->cell_width = width;
+	renderer_settings_dialog_update_labels(dialog);
+}
+
+void renderer_settings_dialog_set_cell_height(RendererSettingsDialog *dialog, unsigned int height)
+{
+	if (!dialog)
+		return;
+
+	if (height == 0)
+		height = 1;
+
+	dialog->cell_height = height;
+	renderer_settings_dialog_update_labels(dialog);
+}
+
+void renderer_settings_dialog_set_database_unit_scale(RendererSettingsDialog *dialog, double unit_in_meters)
+{
+	if (!dialog)
+		return;
+
+	if (unit_in_meters < 0)
+		unit_in_meters *= -1;
+
+	dialog->unit_in_meters = unit_in_meters;
+	renderer_settings_dialog_update_labels(dialog);
+}
+
 /** @} */

widgets/conv-settings-dialog.h

@@ -75,6 +75,27 @@ void renderer_settings_dialog_set_settings(RendererSettingsDialog *dialog, struc
  */
 void renderer_settings_dialog_get_settings(RendererSettingsDialog *dialog, struct render_settings *settings);
 
+/**
+ * @brief renderer_settings_dialog_set_cell_width Set width for rendered cell
+ * @param dialog
+ * @param width Width in database units
+ */
+void renderer_settings_dialog_set_cell_width(RendererSettingsDialog *dialog, unsigned int width);
+
+/**
+ * @brief renderer_settings_dialog_set_cell_height Set height for rendered cell
+ * @param dialog
+ * @param height Height in database units
+ */
+void renderer_settings_dialog_set_cell_height(RendererSettingsDialog *dialog, unsigned int height);
+
+/**
+ * @brief renderer_settings_dialog_set_database_unit_scale Set database scale
+ * @param dialog dialog element
+ * @param unit_in_meters Database unit in meters
+ */
+void renderer_settings_dialog_set_database_unit_scale(RendererSettingsDialog *dialog, double unit_in_meters);
+
 #endif /* __CONV_SETTINGS_DIALOG_H__ */
 
 /** @} */