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-rw-r--r--src/display/control/canvas-axonomgrid.cpp770
1 files changed, 770 insertions, 0 deletions
diff --git a/src/display/control/canvas-axonomgrid.cpp b/src/display/control/canvas-axonomgrid.cpp
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+++ b/src/display/control/canvas-axonomgrid.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ * Johan Engelen <j.b.c.engelen@alumnus.utwente.nl>
+ *
+ * Copyright (C) 2006-2012 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+/*
+ * Current limits are: one axis (y-axis) is always vertical. The other two
+ * axes are bound to a certain range of angles. The z-axis always has an angle
+ * smaller than 90 degrees (measured from horizontal, 0 degrees being a line extending
+ * to the right). The x-axis will always have an angle between 0 and 90 degrees.
+ */
+
+#include <gtkmm/box.h>
+#include <gtkmm/label.h>
+#include <gtkmm/grid.h>
+
+#include <glibmm/i18n.h>
+
+#include <2geom/angle.h>
+#include <2geom/line.h>
+
+#include "canvas-axonomgrid.h"
+#include "canvas-grid.h"
+#include "canvas-item-grid.h"
+
+#include "desktop.h"
+#include "document.h"
+#include "inkscape.h"
+#include "preferences.h"
+
+#include "display/cairo-utils.h"
+
+#include "helper/mathfns.h"
+
+#include "object/sp-namedview.h"
+#include "object/sp-object.h"
+#include "object/sp-root.h"
+
+#include "svg/svg-color.h"
+
+#include "ui/widget/canvas.h"
+#include "ui/widget/registered-widget.h"
+
+#include "util/units.h"
+
+using Inkscape::Util::unit_table;
+
+enum Dim3 { X=0, Y, Z };
+
+/**
+ * This function calls Cairo to render a line on a particular canvas buffer.
+ * Coordinates are interpreted as SCREENcoordinates
+ */
+static void
+sp_caxonomgrid_drawline (Inkscape::CanvasItemBuffer *buf, gint x0, gint y0, gint x1, gint y1, guint32 rgba)
+{
+ buf->cr->move_to(0.5 + x0, 0.5 + y0);
+ buf->cr->line_to(0.5 + x1, 0.5 + y1);
+ buf->cr->set_source_rgba(SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba),
+ SP_RGBA32_B_F(rgba), SP_RGBA32_A_F(rgba));
+ buf->cr->stroke();
+}
+
+static void
+sp_grid_vline (Inkscape::CanvasItemBuffer *buf, gint x, gint ys, gint ye, guint32 rgba)
+{
+ if ((x < buf->rect.left()) || (x >= buf->rect.right()))
+ return;
+
+ buf->cr->move_to(0.5 + x, 0.5 + ys);
+ buf->cr->line_to(0.5 + x, 0.5 + ye);
+ buf->cr->set_source_rgba(SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba),
+ SP_RGBA32_B_F(rgba), SP_RGBA32_A_F(rgba));
+ buf->cr->stroke();
+}
+
+namespace Inkscape {
+
+
+CanvasAxonomGrid::CanvasAxonomGrid (SPNamedView * nv, Inkscape::XML::Node * in_repr, SPDocument * in_doc)
+ : CanvasGrid(nv, in_repr, in_doc, GRID_AXONOMETRIC)
+{
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ gridunit = unit_table.getUnit(prefs->getString("/options/grids/axonom/units"));
+ if (!gridunit) {
+ gridunit = unit_table.getUnit("px");
+ }
+ origin[Geom::X] = Inkscape::Util::Quantity::convert(prefs->getDouble("/options/grids/axonom/origin_x", 0.0), gridunit, "px");
+ origin[Geom::Y] = Inkscape::Util::Quantity::convert(prefs->getDouble("/options/grids/axonom/origin_y", 0.0), gridunit, "px");
+ color = prefs->getInt("/options/grids/axonom/color", GRID_DEFAULT_COLOR);
+ empcolor = prefs->getInt("/options/grids/axonom/empcolor", GRID_DEFAULT_EMPCOLOR);
+ empspacing = prefs->getInt("/options/grids/axonom/empspacing", 5);
+ lengthy = Inkscape::Util::Quantity::convert(prefs->getDouble("/options/grids/axonom/spacing_y", 1.0), gridunit, "px");
+ angle_deg[X] = prefs->getDouble("/options/grids/axonom/angle_x", 30.0);
+ angle_deg[Z] = prefs->getDouble("/options/grids/axonom/angle_z", 30.0);
+ angle_deg[Y] = 0;
+
+ angle_rad[X] = Geom::rad_from_deg(angle_deg[X]);
+ tan_angle[X] = tan(angle_rad[X]);
+ angle_rad[Z] = Geom::rad_from_deg(angle_deg[Z]);
+ tan_angle[Z] = tan(angle_rad[Z]);
+
+ snapper = new CanvasAxonomGridSnapper(this, &namedview->snap_manager, 0);
+
+ if (repr) readRepr();
+}
+
+CanvasAxonomGrid::~CanvasAxonomGrid ()
+{
+ if (snapper) delete snapper;
+}
+
+static gboolean sp_nv_read_opacity(gchar const *str, guint32 *color)
+{
+ if (!str) {
+ return FALSE;
+ }
+
+ gchar *u;
+ gdouble v = g_ascii_strtod(str, &u);
+ if (!u) {
+ return FALSE;
+ }
+ v = CLAMP(v, 0.0, 1.0);
+
+ *color = (*color & 0xffffff00) | (guint32) floor(v * 255.9999);
+
+ return TRUE;
+}
+
+
+
+void
+CanvasAxonomGrid::readRepr()
+{
+ SPRoot *root = doc->getRoot();
+ double scale_x = 1.0;
+ double scale_y = 1.0;
+ if( root->viewBox_set ) {
+ scale_x = root->width.computed / root->viewBox.width();
+ scale_y = root->height.computed / root->viewBox.height();
+ if (Geom::are_near(scale_x / scale_y, 1.0, Geom::EPSILON)) {
+ // scaling is uniform, try to reduce numerical error
+ scale_x = (scale_x + scale_y)/2.0;
+ double scale_none = Inkscape::Util::Quantity::convert(1, doc->getDisplayUnit(), "px");
+ if (Geom::are_near(scale_x / scale_none, 1.0, Geom::EPSILON))
+ scale_x = scale_none; // objects are same size, reduce numerical error
+ scale_y = scale_x;
+ }
+ }
+
+ gchar const *value;
+
+ if ( (value = repr->attribute("originx")) ) {
+
+ Inkscape::Util::Quantity q = unit_table.parseQuantity(value);
+
+ if( q.unit->type == UNIT_TYPE_LINEAR ) {
+ // Legacy grid not in 'user units'
+ origin[Geom::X] = q.value("px");
+ } else {
+ // Grid in 'user units'
+ origin[Geom::X] = q.quantity * scale_x;
+ }
+ }
+
+ if ( (value = repr->attribute("originy")) ) {
+
+ Inkscape::Util::Quantity q = unit_table.parseQuantity(value);
+
+ if( q.unit->type == UNIT_TYPE_LINEAR ) {
+ // Legacy grid not in 'user units'
+ origin[Geom::Y] = q.value("px");
+ } else {
+ // Grid in 'user units'
+ origin[Geom::Y] = q.quantity * scale_y;
+ }
+ }
+
+ if ( (value = repr->attribute("spacingy")) ) {
+
+ Inkscape::Util::Quantity q = unit_table.parseQuantity(value);
+
+ if( q.unit->type == UNIT_TYPE_LINEAR ) {
+ // Legacy grid not in 'user units'
+ lengthy = q.value("px");
+ } else {
+ // Grid in 'user units'
+ lengthy = q.quantity * scale_y; // We do not handle scale_x != scale_y
+ }
+ if (lengthy < 0.0500) lengthy = 0.0500;
+ }
+
+ if ( (value = repr->attribute("gridanglex")) ) {
+ angle_deg[X] = g_ascii_strtod(value, nullptr);
+ if (angle_deg[X] < 0.) angle_deg[X] = 0.;
+ if (angle_deg[X] > 89.0) angle_deg[X] = 89.0;
+ angle_rad[X] = Geom::rad_from_deg(angle_deg[X]);
+ tan_angle[X] = tan(angle_rad[X]);
+ }
+
+ if ( (value = repr->attribute("gridanglez")) ) {
+ angle_deg[Z] = g_ascii_strtod(value, nullptr);
+ if (angle_deg[Z] < 0.) angle_deg[Z] = 0.;
+ if (angle_deg[Z] > 89.0) angle_deg[Z] = 89.0;
+ angle_rad[Z] = Geom::rad_from_deg(angle_deg[Z]);
+ tan_angle[Z] = tan(angle_rad[Z]);
+ }
+
+ if ( (value = repr->attribute("color")) ) {
+ color = (color & 0xff) | sp_svg_read_color(value, color);
+ }
+
+ if ( (value = repr->attribute("empcolor")) ) {
+ empcolor = (empcolor & 0xff) | sp_svg_read_color(value, empcolor);
+ }
+
+ if ( (value = repr->attribute("opacity")) ) {
+ sp_nv_read_opacity(value, &color);
+ }
+ if ( (value = repr->attribute("empopacity")) ) {
+ sp_nv_read_opacity(value, &empcolor);
+ }
+
+ if ( (value = repr->attribute("empspacing")) ) {
+ empspacing = atoi(value);
+ }
+
+ if ( (value = repr->attribute("visible")) ) {
+ visible = (strcmp(value,"false") != 0 && strcmp(value, "0") != 0);
+ }
+
+ if ( (value = repr->attribute("enabled")) ) {
+ g_assert(snapper != nullptr);
+ snapper->setEnabled(strcmp(value,"false") != 0 && strcmp(value, "0") != 0);
+ }
+
+ if ( (value = repr->attribute("snapvisiblegridlinesonly")) ) {
+ g_assert(snapper != nullptr);
+ snapper->setSnapVisibleOnly(strcmp(value,"false") != 0 && strcmp(value, "0") != 0);
+ }
+
+ if ( (value = repr->attribute("units")) ) {
+ gridunit = unit_table.getUnit(value); // Display unit identifier in grid menu
+ }
+
+ for (auto grid : canvas_item_grids) {
+ grid->request_update();
+ }
+
+ return;
+}
+
+/**
+ * Called when XML node attribute changed; updates dialog widgets if change was not done by widgets themselves.
+ */
+void
+CanvasAxonomGrid::onReprAttrChanged(Inkscape::XML::Node */*repr*/, gchar const */*key*/, gchar const */*oldval*/, gchar const */*newval*/, bool /*is_interactive*/)
+{
+ readRepr();
+
+ if ( ! (_wr.isUpdating()) )
+ updateWidgets();
+}
+
+Gtk::Widget *
+CanvasAxonomGrid::newSpecificWidget()
+{
+ _rumg = Gtk::manage( new Inkscape::UI::Widget::RegisteredUnitMenu(
+ _("Grid _units:"), "units", _wr, repr, doc) );
+ _rsu_ox = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalarUnit(
+ _("_Origin X:"), _("X coordinate of grid origin"), "originx",
+ *_rumg, _wr, repr, doc, Inkscape::UI::Widget::RSU_x) );
+ _rsu_oy = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalarUnit(
+ _("O_rigin Y:"), _("Y coordinate of grid origin"), "originy",
+ *_rumg, _wr, repr, doc, Inkscape::UI::Widget::RSU_y) );
+ _rsu_sy = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalarUnit(
+ _("Spacing _Y:"), _("Base length of z-axis"), "spacingy",
+ *_rumg, _wr, repr, doc, Inkscape::UI::Widget::RSU_y) );
+ _rsu_ax = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalar(
+ _("Angle X:"), _("Angle of x-axis"), "gridanglex", _wr, repr, doc ) );
+ _rsu_az = Gtk::manage( new Inkscape::UI::Widget::RegisteredScalar(
+ _("Angle Z:"), _("Angle of z-axis"), "gridanglez", _wr, repr, doc ) );
+
+ _rcp_gcol = Gtk::manage( new Inkscape::UI::Widget::RegisteredColorPicker(
+ _("Minor grid line _color:"), _("Minor grid line color"), _("Color of the minor grid lines"),
+ "color", "opacity", _wr, repr, doc));
+ _rcp_gmcol = Gtk::manage( new Inkscape::UI::Widget::RegisteredColorPicker(
+ _("Ma_jor grid line color:"), _("Major grid line color"),
+ _("Color of the major (highlighted) grid lines"),
+ "empcolor", "empopacity", _wr, repr, doc));
+
+ _rsi = Gtk::manage( new Inkscape::UI::Widget::RegisteredSuffixedInteger(
+ _("_Major grid line every:"), "", _("lines"), "empspacing", _wr, repr, doc ) );
+
+ _rumg->set_hexpand();
+ _rsu_ox->set_hexpand();
+ _rsu_oy->set_hexpand();
+ _rsu_sy->set_hexpand();
+ _rsu_ax->set_hexpand();
+ _rsu_az->set_hexpand();
+ _rcp_gcol->set_hexpand();
+ _rcp_gmcol->set_hexpand();
+ _rsi->set_hexpand();
+
+ // set widget values
+ _wr.setUpdating (true);
+
+ _rsu_ox->setDigits(5);
+ _rsu_ox->setIncrements(0.1, 1.0);
+
+ _rsu_oy->setDigits(5);
+ _rsu_oy->setIncrements(0.1, 1.0);
+
+ _rsu_sy->setDigits(5);
+ _rsu_sy->setIncrements(0.1, 1.0);
+
+ _rumg->setUnit (gridunit->abbr);
+
+ gdouble val;
+ val = origin[Geom::X];
+ val = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_ox->setValue (val);
+ val = origin[Geom::Y];
+ val = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_oy->setValue (val);
+ val = lengthy;
+ double gridy = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_sy->setValue (gridy);
+
+ _rsu_ax->setValue(angle_deg[X]);
+ _rsu_az->setValue(angle_deg[Z]);
+
+ _rcp_gcol->setRgba32 (color);
+ _rcp_gmcol->setRgba32 (empcolor);
+ _rsi->setValue (empspacing);
+
+ _wr.setUpdating (false);
+
+ _rsu_ox->setProgrammatically = false;
+ _rsu_oy->setProgrammatically = false;
+
+ Gtk::Box *column = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_VERTICAL, 4));
+ column->pack_start(*_rumg, true, false);
+ column->pack_start(*_rsu_ox, true, false);
+ column->pack_start(*_rsu_oy, true, false);
+ column->pack_start(*_rsu_sy, true, false);
+ column->pack_start(*_rsu_ax, true, false);
+ column->pack_start(*_rsu_az, true, false);
+ column->pack_start(*_rcp_gcol, true, false);
+ column->pack_start(*_rcp_gmcol, true, false);
+ column->pack_start(*_rsi, true, false);
+
+ return column;
+}
+
+
+/**
+ * Update dialog widgets from object's values.
+ */
+void
+CanvasAxonomGrid::updateWidgets()
+{
+ if (_wr.isUpdating()) return;
+
+ //no widgets (grid created with the document, not with the dialog)
+ if (!_rcb_visible) return;
+
+ _wr.setUpdating (true);
+
+ _rcb_visible->setActive(visible);
+ if (snapper != nullptr) {
+ _rcb_enabled->setActive(snapper->getEnabled());
+ _rcb_snap_visible_only->setActive(snapper->getSnapVisibleOnly());
+ }
+
+ _rumg->setUnit (gridunit->abbr);
+
+ gdouble val;
+
+ val = origin[Geom::X];
+ val = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_ox->setValue (val);
+
+ val = origin[Geom::Y];
+ val = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_oy->setValue (val);
+
+ val = lengthy;
+ val = Inkscape::Util::Quantity::convert(val, "px", gridunit);
+ _rsu_sy->setValue (val);
+
+ _rsu_ax->setValue(angle_deg[X]);
+ _rsu_az->setValue(angle_deg[Z]);
+
+ _rsu_ox->setProgrammatically = false;
+ _rsu_oy->setProgrammatically = false;
+ _rsu_sy->setProgrammatically = false;
+ _rsu_ax->setProgrammatically = false;
+ _rsu_az->setProgrammatically = false;
+
+ _rcp_gcol->setRgba32 (color);
+ _rcp_gmcol->setRgba32 (empcolor);
+ _rsi->setValue (empspacing);
+
+ _wr.setUpdating (false);
+}
+
+
+
+void
+CanvasAxonomGrid::Update (Geom::Affine const &affine, unsigned int /*flags*/)
+{
+ ow = origin * affine;
+ sw = Geom::Point(fabs(affine[0]),fabs(affine[3]));
+ sw *= lengthy;
+
+ scaled = false;
+
+ for(int dim = 0; dim < 2; dim++) {
+ gint scaling_factor = empspacing;
+
+ if (scaling_factor <= 1)
+ scaling_factor = 5;
+
+ int watchdog = 0;
+ while ( (sw[dim] < 8.0) & (watchdog < 100) ) {
+ scaled = true;
+ sw[dim] *= scaling_factor;
+ // First pass, go up to the major line spacing, then
+ // keep increasing by two.
+ scaling_factor = 2;
+ watchdog++;
+ }
+
+ }
+
+ spacing_ylines = sw[Geom::X] /(tan_angle[X] + tan_angle[Z]);
+ lyw = sw[Geom::Y];
+ lxw_x = Geom::are_near(tan_angle[X],0.) ? Geom::infinity() : sw[Geom::X] / tan_angle[X];
+ lxw_z = Geom::are_near(tan_angle[Z],0.) ? Geom::infinity() : sw[Geom::X] / tan_angle[Z];
+
+ if (empspacing == 0) {
+ scaled = true;
+ }
+}
+
+void
+CanvasAxonomGrid::Render (Inkscape::CanvasItemBuffer *buf)
+{
+ //set correct coloring, depending preference (when zoomed out, always major coloring or minor coloring)
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ guint32 _empcolor;
+ guint32 _color = color;
+ bool preference = prefs->getBool("/options/grids/no_emphasize_when_zoomedout", false);
+ if( scaled && preference ) {
+ _empcolor = color;
+ } else {
+ _empcolor = empcolor;
+ }
+
+ bool xrayactive = prefs->getBool("/desktop/xrayactive", false);
+ if (xrayactive) { //this allow good looking on xray zones
+ guint32 bg = 0xffffffff;
+ _color = SP_RGBA32_F_COMPOSE(
+ CLAMP(((1 - SP_RGBA32_A_F(_color)) * SP_RGBA32_R_F(bg)) + (SP_RGBA32_A_F(_color) * SP_RGBA32_R_F(_color)), 0.0, 1.0),
+ CLAMP(((1 - SP_RGBA32_A_F(_color)) * SP_RGBA32_G_F(bg)) + (SP_RGBA32_A_F(_color) * SP_RGBA32_G_F(_color)), 0.0, 1.0),
+ CLAMP(((1 - SP_RGBA32_A_F(_color)) * SP_RGBA32_B_F(bg)) + (SP_RGBA32_A_F(_color) * SP_RGBA32_B_F(_color)), 0.0, 1.0),
+ 1.0);
+ _empcolor = SP_RGBA32_F_COMPOSE(
+ CLAMP(((1 - SP_RGBA32_A_F(_empcolor)) * SP_RGBA32_R_F(bg)) + (SP_RGBA32_A_F(_empcolor) * SP_RGBA32_R_F(_empcolor)), 0.0, 1.0),
+ CLAMP(((1 - SP_RGBA32_A_F(_empcolor)) * SP_RGBA32_G_F(bg)) + (SP_RGBA32_A_F(_empcolor) * SP_RGBA32_G_F(_empcolor)), 0.0, 1.0),
+ CLAMP(((1 - SP_RGBA32_A_F(_empcolor)) * SP_RGBA32_B_F(bg)) + (SP_RGBA32_A_F(_empcolor) * SP_RGBA32_B_F(_empcolor)), 0.0, 1.0),
+ 1.0);
+ }
+
+ buf->cr->save();
+ buf->cr->translate(-buf->rect.left(), -buf->rect.top());
+ buf->cr->set_line_width(1.0);
+ buf->cr->set_line_cap(Cairo::LINE_CAP_SQUARE);
+
+ // gc = gridcoordinates (the coordinates calculated from the grids origin 'grid->ow'.
+ // sc = screencoordinates ( for example "buf->rect.left()" is in screencoordinates )
+ // bc = buffer patch coordinates (x=0 on left side of page, y=0 on bottom of page)
+
+ // tl = topleft ; br = bottomright
+ Geom::Point buf_tl_gc;
+ Geom::Point buf_br_gc;
+ buf_tl_gc[Geom::X] = buf->rect.left() - ow[Geom::X];
+ buf_tl_gc[Geom::Y] = buf->rect.top() - ow[Geom::Y];
+ buf_br_gc[Geom::X] = buf->rect.right() - ow[Geom::X];
+ buf_br_gc[Geom::Y] = buf->rect.bottom() - ow[Geom::Y];
+
+ // render the three separate line groups representing the main-axes
+
+ // x-axis always goes from topleft to bottomright. (0,0) - (1,1)
+ gdouble const xintercept_y_bc = (buf_tl_gc[Geom::X] * tan_angle[X]) - buf_tl_gc[Geom::Y] ;
+ gdouble const xstart_y_sc = ( xintercept_y_bc - floor(xintercept_y_bc/lyw)*lyw ) + buf->rect.top();
+ gint const xlinestart = round( (xstart_y_sc - buf_tl_gc[Geom::X]*tan_angle[X] - ow[Geom::Y]) / lyw );
+ gint xlinenum = xlinestart;
+
+ // lines starting on left side.
+
+ for (gdouble y = xstart_y_sc; y < buf->rect.bottom(); y += lyw, xlinenum++) {
+ gint const x0 = buf->rect.left();
+ gint const y0 = round(y);
+ gint x1 = x0 + round( (buf->rect.bottom() - y) / tan_angle[X] );
+ gint y1 = buf->rect.bottom();
+ if ( Geom::are_near(tan_angle[X],0.) ) {
+ x1 = buf->rect.right();
+ y1 = y0;
+ }
+
+ if (!scaled && (xlinenum % empspacing) != 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _color);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
+ }
+ }
+ // lines starting from top side
+ if (!Geom::are_near(tan_angle[X],0.))
+ {
+ gdouble const xstart_x_sc = buf->rect.left() + (lxw_x - (xstart_y_sc - buf->rect.top()) / tan_angle[X]) ;
+ xlinenum = xlinestart-1;
+ for (gdouble x = xstart_x_sc; x < buf->rect.right(); x += lxw_x, xlinenum--) {
+ gint const y0 = buf->rect.top();
+ gint const y1 = buf->rect.bottom();
+ gint const x0 = round(x);
+ gint const x1 = x0 + round( (y1 - y0) / tan_angle[X] );
+
+ if (!scaled && (xlinenum % empspacing) != 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _color);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
+ }
+ }
+ }
+
+ // y-axis lines (vertical)
+ gdouble const ystart_x_sc = floor (buf_tl_gc[Geom::X] / spacing_ylines) * spacing_ylines + ow[Geom::X];
+ gint const ylinestart = round((ystart_x_sc - ow[Geom::X]) / spacing_ylines);
+ gint ylinenum = ylinestart;
+ for (gdouble x = ystart_x_sc; x < buf->rect.right(); x += spacing_ylines, ylinenum++) {
+ gint const x0 = floor(x); // sp_grid_vline will add 0.5 again, so we'll pre-emptively use floor()
+ // instead of round() to avoid biasing the vertical lines to the right by half a pixel; see
+ // CanvasXYGrid::Render() for more details
+ if (!scaled && (ylinenum % empspacing) != 0) {
+ sp_grid_vline (buf, x0, buf->rect.top(), buf->rect.bottom() - 1, _color);
+ } else {
+ sp_grid_vline (buf, x0, buf->rect.top(), buf->rect.bottom() - 1, _empcolor);
+ }
+ }
+
+ // z-axis always goes from bottomleft to topright. (0,1) - (1,0)
+ gdouble const zintercept_y_bc = (buf_tl_gc[Geom::X] * -tan_angle[Z]) - buf_tl_gc[Geom::Y] ;
+ gdouble const zstart_y_sc = ( zintercept_y_bc - floor(zintercept_y_bc/lyw)*lyw ) + buf->rect.top();
+ gint const zlinestart = round( (zstart_y_sc + buf_tl_gc[Geom::X]*tan_angle[Z] - ow[Geom::Y]) / lyw );
+ gint zlinenum = zlinestart;
+ // lines starting from left side
+ gdouble next_y = zstart_y_sc;
+ for (gdouble y = zstart_y_sc; y < buf->rect.bottom(); y += lyw, zlinenum++, next_y = y) {
+ gint const x0 = buf->rect.left();
+ gint const y0 = round(y);
+ gint x1 = x0 + round( (y - buf->rect.top() ) / tan_angle[Z] );
+ gint y1 = buf->rect.top();
+ if ( Geom::are_near(tan_angle[Z],0.) ) {
+ x1 = buf->rect.right();
+ y1 = y0;
+ }
+
+ if (!scaled && (zlinenum % empspacing) != 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _color);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
+ }
+ }
+ // draw lines from bottom-up
+ if (!Geom::are_near(tan_angle[Z],0.))
+ {
+ gdouble const zstart_x_sc = buf->rect.left() + (next_y - buf->rect.bottom()) / tan_angle[Z] ;
+ for (gdouble x = zstart_x_sc; x < buf->rect.right(); x += lxw_z, zlinenum++) {
+ gint const y0 = buf->rect.bottom();
+ gint const y1 = buf->rect.top();
+ gint const x0 = round(x);
+ gint const x1 = x0 + round(buf->rect.height() / tan_angle[Z] );
+
+ if (!scaled && (zlinenum % empspacing) != 0) {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _color);
+ } else {
+ sp_caxonomgrid_drawline (buf, x0, y0, x1, y1, _empcolor);
+ }
+ }
+ }
+
+ buf->cr->restore();
+}
+
+CanvasAxonomGridSnapper::CanvasAxonomGridSnapper(CanvasAxonomGrid *grid, SnapManager *sm, Geom::Coord const d) : LineSnapper(sm, d)
+{
+ this->grid = grid;
+}
+
+/**
+ * \return Snap tolerance (desktop coordinates); depends on current zoom so that it's always the same in screen pixels
+ */
+Geom::Coord CanvasAxonomGridSnapper::getSnapperTolerance() const
+{
+ SPDesktop const *dt = _snapmanager->getDesktop();
+ double const zoom = dt ? dt->current_zoom() : 1;
+ return _snapmanager->snapprefs.getGridTolerance() / zoom;
+}
+
+bool CanvasAxonomGridSnapper::getSnapperAlwaysSnap() const
+{
+ return _snapmanager->snapprefs.getGridTolerance() == 10000; //TODO: Replace this threshold of 10000 by a constant; see also tolerance-slider.cpp
+}
+
+LineSnapper::LineList
+CanvasAxonomGridSnapper::_getSnapLines(Geom::Point const &p) const
+{
+ LineList s;
+
+ if ( grid == nullptr ) {
+ return s;
+ }
+
+ SPDesktop const *dt = _snapmanager->getDesktop();
+ double ta_x = grid->tan_angle[X];
+ double ta_z = grid->tan_angle[Z];
+
+ if (dt && dt->is_yaxisdown()) {
+ std::swap(ta_x, ta_z);
+ }
+
+ double spacing_h;
+ double spacing_v;
+
+ if (getSnapVisibleOnly()) {
+ // Only snapping to visible grid lines
+ spacing_h = grid->spacing_ylines; // this is the spacing of the visible grid lines measured in screen pixels
+ spacing_v = grid->lyw; // vertical
+ // convert screen pixels to px
+ // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
+ if (dt) {
+ spacing_h /= dt->current_zoom();
+ spacing_v /= dt->current_zoom();
+ }
+ } else {
+ // Snapping to any grid line, whether it's visible or not
+ spacing_h = grid->lengthy /(grid->tan_angle[X] + grid->tan_angle[Z]);
+ spacing_v = grid->lengthy;
+
+ }
+
+ // In an axonometric grid, any point will be surrounded by 6 grid lines:
+ // - 2 vertical grid lines, one left and one right from the point
+ // - 2 angled z grid lines, one above and one below the point
+ // - 2 angled x grid lines, one above and one below the point
+
+ // Calculate the x coordinate of the vertical grid lines
+ Geom::Coord x_max = Inkscape::Util::round_to_upper_multiple_plus(p[Geom::X], spacing_h, grid->origin[Geom::X]);
+ Geom::Coord x_min = Inkscape::Util::round_to_lower_multiple_plus(p[Geom::X], spacing_h, grid->origin[Geom::X]);
+
+ // Calculate the y coordinate of the intersection of the angled grid lines with the y-axis
+ double y_proj_along_z = p[Geom::Y] - ta_z * (p[Geom::X] - grid->origin[Geom::X]);
+ double y_proj_along_x = p[Geom::Y] + ta_x * (p[Geom::X] - grid->origin[Geom::X]);
+ double y_proj_along_z_max = Inkscape::Util::round_to_upper_multiple_plus(y_proj_along_z, spacing_v, grid->origin[Geom::Y]);
+ double y_proj_along_z_min = Inkscape::Util::round_to_lower_multiple_plus(y_proj_along_z, spacing_v, grid->origin[Geom::Y]);
+ double y_proj_along_x_max = Inkscape::Util::round_to_upper_multiple_plus(y_proj_along_x, spacing_v, grid->origin[Geom::Y]);
+ double y_proj_along_x_min = Inkscape::Util::round_to_lower_multiple_plus(y_proj_along_x, spacing_v, grid->origin[Geom::Y]);
+
+ // Calculate the versor for the angled grid lines
+ Geom::Point vers_x = Geom::Point(1, -ta_x);
+ Geom::Point vers_z = Geom::Point(1, ta_z);
+
+ // Calculate the normal for the angled grid lines
+ Geom::Point norm_x = Geom::rot90(vers_x);
+ Geom::Point norm_z = Geom::rot90(vers_z);
+
+ // The four angled grid lines form a parallelogram, enclosing the point
+ // One of the two vertical grid lines divides this parallelogram in two triangles
+ // We will now try to find out in which half (i.e. triangle) our point is, and return
+ // only the three grid lines defining that triangle
+
+ // The vertical grid line is at the intersection of two angled grid lines.
+ // Now go find that intersection!
+ Geom::Point p_x(0, y_proj_along_x_max);
+ Geom::Line line_x(p_x, p_x + vers_x);
+ Geom::Point p_z(0, y_proj_along_z_max);
+ Geom::Line line_z(p_z, p_z + vers_z);
+
+ Geom::OptCrossing inters = Geom::OptCrossing(); // empty by default
+ try
+ {
+ inters = Geom::intersection(line_x, line_z);
+ }
+ catch (Geom::InfiniteSolutions &e)
+ {
+ // We're probably dealing with parallel lines; this is useless!
+ return s;
+ }
+
+ // Determine which half of the parallelogram to use
+ bool use_left_half = true;
+ bool use_right_half = true;
+
+ if (inters) {
+ Geom::Point inters_pt = line_x.pointAt((*inters).ta);
+ use_left_half = (p[Geom::X] - grid->origin[Geom::X]) < inters_pt[Geom::X];
+ use_right_half = !use_left_half;
+ }
+
+ // Return the three grid lines which define the triangle that encloses our point
+ // If we didn't find an intersection above, all 6 grid lines will be returned
+ if (use_left_half) {
+ s.push_back(std::make_pair(norm_z, Geom::Point(grid->origin[Geom::X], y_proj_along_z_max)));
+ s.push_back(std::make_pair(norm_x, Geom::Point(grid->origin[Geom::X], y_proj_along_x_min)));
+ s.push_back(std::make_pair(Geom::Point(1, 0), Geom::Point(x_max, 0)));
+ }
+
+ if (use_right_half) {
+ s.push_back(std::make_pair(norm_z, Geom::Point(grid->origin[Geom::X], y_proj_along_z_min)));
+ s.push_back(std::make_pair(norm_x, Geom::Point(grid->origin[Geom::X], y_proj_along_x_max)));
+ s.push_back(std::make_pair(Geom::Point(1, 0), Geom::Point(x_min, 0)));
+ }
+
+ return s;
+}
+
+void CanvasAxonomGridSnapper::_addSnappedLine(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, Geom::Point const &normal_to_line, Geom::Point const &point_on_line) const
+{
+ SnappedLine dummy = SnappedLine(snapped_point, snapped_distance, source, source_num, Inkscape::SNAPTARGET_GRID, getSnapperTolerance(), getSnapperAlwaysSnap(), normal_to_line, point_on_line);
+ isr.grid_lines.push_back(dummy);
+}
+
+void CanvasAxonomGridSnapper::_addSnappedPoint(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const
+{
+ SnappedPoint dummy = SnappedPoint(snapped_point, source, source_num, Inkscape::SNAPTARGET_GRID, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), constrained_snap, true);
+ isr.points.push_back(dummy);
+}
+
+void CanvasAxonomGridSnapper::_addSnappedLinePerpendicularly(IntermSnapResults &isr, Geom::Point const &snapped_point, Geom::Coord const &snapped_distance, SnapSourceType const &source, long source_num, bool constrained_snap) const
+{
+ SnappedPoint dummy = SnappedPoint(snapped_point, source, source_num, Inkscape::SNAPTARGET_GRID_PERPENDICULAR, snapped_distance, getSnapperTolerance(), getSnapperAlwaysSnap(), constrained_snap, true);
+ isr.points.push_back(dummy);
+}
+
+bool CanvasAxonomGridSnapper::ThisSnapperMightSnap() const
+{
+ return _snap_enabled && _snapmanager->snapprefs.isTargetSnappable(Inkscape::SNAPTARGET_GRID);
+}
+
+
+}; // namespace Inkscape
+
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 20:36:13 +0000