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Diffstat (limited to 'src/display/control/canvas-axonomgrid.cpp')
| -rw-r--r-- | src/display/control/canvas-axonomgrid.cpp | 770 |
1 files changed, 770 insertions, 0 deletions
diff --git a/src/display/control/canvas-axonomgrid.cpp b/src/display/control/canvas-axonomgrid.cpp new file mode 100644 index 0000000..6ec4626 --- /dev/null +++ b/src/display/control/canvas-axonomgrid.cpp @@ -0,0 +1,770 @@ +// 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 : |