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Diffstat (limited to 'src/ui/tools/dropper-tool.cpp')
| -rw-r--r-- | src/ui/tools/dropper-tool.cpp | 402 |
1 files changed, 402 insertions, 0 deletions
diff --git a/src/ui/tools/dropper-tool.cpp b/src/ui/tools/dropper-tool.cpp new file mode 100644 index 0000000..e7ff4fb --- /dev/null +++ b/src/ui/tools/dropper-tool.cpp @@ -0,0 +1,402 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Tool for picking colors from drawing + * + * Authors: + * Lauris Kaplinski <lauris@kaplinski.com> + * bulia byak <buliabyak@users.sf.net> + * Abhishek Sharma + * + * Copyright (C) 1999-2005 Authors + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <glibmm/i18n.h> +#include <gdk/gdk.h> +#include <gdk/gdkkeysyms.h> + +#include <2geom/transforms.h> +#include <2geom/circle.h> + +#include "desktop-style.h" +#include "desktop.h" +#include "document-undo.h" +#include "message-context.h" +#include "preferences.h" +#include "selection.h" +#include "style.h" +#include "page-manager.h" + +#include "display/curve.h" +#include "display/drawing.h" +#include "display/control/canvas-item-bpath.h" +#include "display/control/canvas-item-drawing.h" + +#include "include/macros.h" + +#include "object/sp-namedview.h" + +#include "svg/svg-color.h" + +#include "ui/cursor-utils.h" +#include "ui/icon-names.h" +#include "ui/tools/dropper-tool.h" +#include "ui/widget/canvas.h" + +using Inkscape::DocumentUndo; + +namespace Inkscape { +namespace UI { +namespace Tools { + +DropperTool::DropperTool(SPDesktop *desktop) + : ToolBase(desktop, "/tools/dropper", "dropper-pick-fill.svg") +{ + area = new Inkscape::CanvasItemBpath(desktop->getCanvasControls()); + area->set_stroke(0x0000007f); + area->set_fill(0x0, SP_WIND_RULE_EVENODD); + area->hide(); + + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + + if (prefs->getBool("/tools/dropper/selcue")) { + this->enableSelectionCue(); + } + + if (prefs->getBool("/tools/dropper/gradientdrag")) { + this->enableGrDrag(); + } +} + +DropperTool::~DropperTool() +{ + this->enableGrDrag(false); + + ungrabCanvasEvents(); + + if (this->area) { + delete this->area; + this->area = nullptr; + } +} + +/** + * Returns the current dropper context color. + * + * - If in dropping mode, returns color from selected objects. + * Ignored if non_dropping set to true. + * - If in dragging mode, returns average color on canvas, depending on radius + * - If in pick mode, alpha is not premultiplied. Alpha is only set if in pick mode + * and setalpha is true. Both values are taken from preferences. + * + * @param invert If true, invert the rgb value + * @param non_dropping If true, use color from canvas, even in dropping mode. + */ +guint32 DropperTool::get_color(bool invert, bool non_dropping) { + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + + int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE); + bool setalpha = prefs->getBool("/tools/dropper/setalpha", true); + + // non_dropping ignores dropping mode and always uses color from canvas. + // Used by the clipboard + double r = non_dropping ? this->non_dropping_R : this->R; + double g = non_dropping ? this->non_dropping_G : this->G; + double b = non_dropping ? this->non_dropping_B : this->B; + double a = non_dropping ? this->non_dropping_A : this->alpha; + + return SP_RGBA32_F_COMPOSE( + fabs(invert - r), + fabs(invert - g), + fabs(invert - b), + (pick == SP_DROPPER_PICK_ACTUAL && setalpha) ? a : 1.0); +} + +bool DropperTool::root_handler(GdkEvent* event) { + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + + int ret = FALSE; + int pick = prefs->getInt("/tools/dropper/pick", SP_DROPPER_PICK_VISIBLE); + + // Decide first what kind of 'mode' we're in. + if (event->type == GDK_KEY_PRESS || event->type == GDK_KEY_RELEASE) { + switch (event->key.keyval) { + case GDK_KEY_Shift_L: + case GDK_KEY_Shift_R: + this->stroke = event->type == GDK_KEY_PRESS; + break; + case GDK_KEY_Control_L: + case GDK_KEY_Control_R: + this->dropping = event->type == GDK_KEY_PRESS; + break; + case GDK_KEY_Alt_L: + case GDK_KEY_Alt_R: + this->invert = event->type == GDK_KEY_PRESS; + break; + } + } + + // Get color from selected object + // Only if dropping mode enabled and object's color is set. + // Otherwise dropping mode disabled. + if(this->dropping) { + Inkscape::Selection *selection = _desktop->getSelection(); + g_assert(selection); + guint32 apply_color; + bool apply_set = false; + for (auto& obj: selection->objects()) { + if(obj->style) { + double opacity = 1.0; + if(!this->stroke && obj->style->fill.set) { + if(obj->style->fill_opacity.set) { + opacity = SP_SCALE24_TO_FLOAT(obj->style->fill_opacity.value); + } + apply_color = obj->style->fill.value.color.toRGBA32(opacity); + apply_set = true; + } else if(this->stroke && obj->style->stroke.set) { + if(obj->style->stroke_opacity.set) { + opacity = SP_SCALE24_TO_FLOAT(obj->style->stroke_opacity.value); + } + apply_color = obj->style->stroke.value.color.toRGBA32(opacity); + apply_set = true; + } + } + } + if(apply_set) { + this->R = SP_RGBA32_R_F(apply_color); + this->G = SP_RGBA32_G_F(apply_color); + this->B = SP_RGBA32_B_F(apply_color); + this->alpha = SP_RGBA32_A_F(apply_color); + } else { + // This means that having no selection or some other error + // we will default back to normal dropper mode. + this->dropping = false; + } + } + + switch (event->type) { + case GDK_BUTTON_PRESS: + if (event->button.button == 1) { + this->centre = Geom::Point(event->button.x, event->button.y); + this->dragging = true; + ret = TRUE; + } + + grabCanvasEvents(Gdk::KEY_PRESS_MASK | + Gdk::KEY_RELEASE_MASK | + Gdk::BUTTON_RELEASE_MASK | + Gdk::POINTER_MOTION_MASK | + Gdk::BUTTON_PRESS_MASK ); + break; + + case GDK_MOTION_NOTIFY: + if (event->motion.state & GDK_BUTTON2_MASK || event->motion.state & GDK_BUTTON3_MASK) { + // pass on middle and right drag + ret = FALSE; + break; + } else { + // otherwise, constantly calculate color no matter if any button pressed or not + + Geom::IntRect pick_area; + if (this->dragging) { + // calculate average + + // radius + double rw = std::min(Geom::L2(Geom::Point(event->button.x, event->button.y) - this->centre), 400.0); + if (rw == 0) { // happens sometimes, little idea why... + break; + } + this->radius = rw; + + Geom::Point const cd = _desktop->w2d(this->centre); + Geom::Affine const w2dt = _desktop->w2d(); + const double scale = rw * w2dt.descrim(); + Geom::Affine const sm( Geom::Scale(scale, scale) * Geom::Translate(cd) ); + + // Show circle on canvas + Geom::PathVector path = Geom::Path(Geom::Circle(0, 0, 1)); // Unit circle centered at origin. + path *= sm; + this->area->set_bpath(path); + this->area->show(); + + /* Get buffer */ + Geom::Rect r(this->centre, this->centre); + r.expandBy(rw); + if (!r.hasZeroArea()) { + pick_area = r.roundOutwards(); + + } + } else { + // pick single pixel + pick_area = Geom::IntRect::from_xywh(floor(event->button.x), floor(event->button.y), 1, 1); + } + + Inkscape::CanvasItemDrawing *canvas_item_drawing = _desktop->getCanvasDrawing(); + Inkscape::Drawing *drawing = canvas_item_drawing->get_drawing(); + + // Ensure drawing up-to-date. (Is this really necessary?) + drawing->update(); + + // Get average color. + double R, G, B, A; + drawing->average_color(pick_area, R, G, B, A); + + if (pick == SP_DROPPER_PICK_VISIBLE) { + // compose with page color + auto bg = _desktop->getDocument()->getPageManager().getDefaultBackgroundColor(); + R = R + bg[0] * (1 - A); + G = G + bg[1] * (1 - A); + B = B + bg[2] * (1 - A); + A = 1.0; + } else { + // un-premultiply color channels + if (A > 0) { + R /= A; + G /= A; + B /= A; + } + } + + if (fabs(A) < 1e-4) { + A = 0; // suppress exponentials, CSS does not allow that + } + + // remember color + if (!this->dropping) { + this->R = R; + this->G = G; + this->B = B; + this->alpha = A; + } + // remember color from canvas, even in dropping mode + // These values are used by the clipboard + this->non_dropping_R = R; + this->non_dropping_G = G; + this->non_dropping_B = B; + this->non_dropping_A = A; + + ret = TRUE; + } + break; + + case GDK_BUTTON_RELEASE: + if (event->button.button == 1) { + this->area->hide(); + this->dragging = false; + + ungrabCanvasEvents(); + + Inkscape::Selection *selection = _desktop->getSelection(); + g_assert(selection); + std::vector<SPItem *> old_selection(selection->items().begin(), selection->items().end()); + if(this->dropping) { + Geom::Point const button_w(event->button.x, event->button.y); + // remember clicked item, disregarding groups, honoring Alt + this->item_to_select = sp_event_context_find_item (_desktop, button_w, event->button.state & GDK_MOD1_MASK, TRUE); + + // Change selected object to object under cursor + if (this->item_to_select) { + std::vector<SPItem *> vec(selection->items().begin(), selection->items().end()); + selection->set(this->item_to_select); + } + } + + auto picked_color = ColorRGBA(this->get_color(this->invert)); + + // One time pick has active signal, call them all and clear. + if (!onetimepick_signal.empty()) + { + onetimepick_signal.emit(&picked_color); + onetimepick_signal.clear(); + // Do this last as it destroys the picker tool. + sp_toggle_dropper(_desktop); + return true; + } + + // do the actual color setting + sp_desktop_set_color(_desktop, picked_color, false, !this->stroke); + + // REJON: set aux. toolbar input to hex color! + if (!(_desktop->getSelection()->isEmpty())) { + DocumentUndo::done(_desktop->getDocument(), _("Set picked color"), INKSCAPE_ICON("color-picker")); + } + if(this->dropping) { + selection->setList(old_selection); + } + + + ret = TRUE; + } + break; + + case GDK_KEY_PRESS: + switch (get_latin_keyval(&event->key)) { + case GDK_KEY_Up: + case GDK_KEY_Down: + case GDK_KEY_KP_Up: + case GDK_KEY_KP_Down: + // prevent the zoom field from activation + if (!MOD__CTRL_ONLY(event)) { + ret = TRUE; + } + break; + case GDK_KEY_Escape: + _desktop->getSelection()->clear(); + break; + } + break; + } + + // set the status message to the right text. + gchar c[64]; + sp_svg_write_color(c, sizeof(c), this->get_color(this->invert)); + + // alpha of color under cursor, to show in the statusbar + // locale-sensitive printf is OK, since this goes to the UI, not into SVG + gchar *alpha = g_strdup_printf(_(" alpha %.3g"), this->alpha); + // where the color is picked, to show in the statusbar + gchar *where = this->dragging ? g_strdup_printf(_(", averaged with radius %d"), (int) this->radius) : g_strdup_printf("%s", _(" under cursor")); + // message, to show in the statusbar + const gchar *message = this->dragging ? _("<b>Release mouse</b> to set color.") : _("<b>Click</b> to set fill, <b>Shift+click</b> to set stroke; <b>drag</b> to average color in area; with <b>Alt</b> to pick inverse color; <b>Ctrl+C</b> to copy the color under mouse to clipboard"); + + this->defaultMessageContext()->setF( + Inkscape::NORMAL_MESSAGE, + "<b>%s%s</b>%s. %s", c, + (pick == SP_DROPPER_PICK_VISIBLE) ? "" : alpha, where, message); + + g_free(where); + g_free(alpha); + + // Set the right cursor for the mode and apply the special Fill color + _cursor_filename = (this->dropping ? (this->stroke ? "dropper-drop-stroke.svg" : "dropper-drop-fill.svg") : + (this->stroke ? "dropper-pick-stroke.svg" : "dropper-pick-fill.svg") ); + + // We do this ourselves to get color correct. + auto display = _desktop->getCanvas()->get_display(); + auto window = _desktop->getCanvas()->get_window(); + auto cursor = load_svg_cursor(display, window, _cursor_filename, get_color(invert)); + window->set_cursor(cursor); + + if (!ret) { + ret = ToolBase::root_handler(event); + } + + return ret; +} + +} +} +} + + +/* + 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 : |