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Diffstat (limited to 'src/display/control/canvas-item-text.cpp')
| -rw-r--r-- | src/display/control/canvas-item-text.cpp | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-text.cpp b/src/display/control/canvas-item-text.cpp new file mode 100644 index 0000000..f4a6801 --- /dev/null +++ b/src/display/control/canvas-item-text.cpp @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * A class to represent a control textrilateral. Used to highlight selected text. + */ + +/* + * Author: + * Tavmjong Bah + * + * Copyright (C) 2020 Tavmjong Bah + * + * Rewrite of SPCtrlTextr + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "canvas-item-text.h" + +#include <cmath> +#include <utility> // std::move +#include <glibmm/i18n.h> + +#include "color.h" // SP_RGBA_x_F + +#include "ui/widget/canvas.h" + +namespace Inkscape { + +/** + * Create an null control text. + */ +CanvasItemText::CanvasItemText(CanvasItemGroup *group) + : CanvasItem(group) +{ + _name = "CanvasItemText"; + _pickable = false; // Text is never pickable. + _fill = 0x33337fff; // Override CanvasItem default. +} + +/** + * Create a control text. Point are in document coordinates. + */ +CanvasItemText::CanvasItemText(CanvasItemGroup *group, Geom::Point const &p, Glib::ustring text) + : CanvasItem(group) + , _p(p) + , _text(std::move(text)) +{ + _name = "CanvasItemText"; + _pickable = false; // Text is never pickable. + _fill = 0x33337fff; // Override CanvasItem default. + + request_update(); +} + +/** + * Set a text position. Position is in document coordinates. + */ +void CanvasItemText::set_coord(Geom::Point const &p) +{ + _p = p; + + request_update(); +} + +/** + * Set a text position. Position is in document coordinates. + */ +void CanvasItemText::set_bg_radius(double const &rad) +{ + _bg_rad = rad; + + request_update(); +} + +/** + * Returns distance between point in canvas units and nearest point on text. + */ +double CanvasItemText::closest_distance_to(Geom::Point const &p) +{ + double d = Geom::infinity(); + std::cerr << "CanvasItemText::closest_distance_to: Not implemented!" << std::endl; + return d; +} + +/** + * Returns true if point p (in canvas units) is within tolerance (canvas units) distance of text. + */ +bool CanvasItemText::contains(Geom::Point const &p, double tolerance) +{ + return false; // We never select text. +} + +/** + * Update and redraw control text. + */ +void CanvasItemText::update(Geom::Affine const &affine) +{ + if (_affine == affine && !_need_update) { + // Nothing to do. + return; + } + + // Queue redraw of old area (erase previous content). + request_redraw(); + + // Get new bounds + _affine = affine; + Geom::Point p = _p * _affine; + + // Measure text size + auto surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, 1, 1); + auto context = Cairo::Context::create(surface); + context->select_font_face(_fontname, Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_NORMAL); + context->set_font_size(_fontsize); + context->get_text_extents(_text, _text_size); + + if (_fixed_line) { + // TRANSLATORS: This is a set of letters to test for font accender and decenders. + context->get_text_extents(_("lg1p$"), _text_extent); + } else { + _text_extent = _text_size; + } + + // See note at bottom. + _bounds = Geom::Rect::from_xywh(0, 0, + _text_size.x_advance + (_border * 2), + _text_extent.height + (_border * 2)); + + // Offset relative to requested point + double offset_x = -(_anchor_position.x() * _bounds.width()); + double offset_y = -(_anchor_position.y() * _bounds.height()); + offset_x += p.x() + _adjust_offset.x(); + offset_y += p.y() + _adjust_offset.y(); + _bounds *= Geom::Translate(Geom::Point(int(offset_x), int(offset_y))); + + // Pixel alignment of background. Avoid aliasing artifacts on redraw. + _bounds = _bounds.roundOutwards(); + + // Queue redraw of new area + request_redraw(); + + _need_update = false; +} + +/** + * Render text to screen via Cairo. + */ +void CanvasItemText::render(Inkscape::CanvasItemBuffer *buf) +{ + if (!buf) { + std::cerr << "CanvasItemText::Render: No buffer!" << std::endl; + return; + } + + if (!_visible) { + // Hidden + return; + } + + buf->cr->save(); + + double x = _bounds.min().x() - buf->rect.min().x(); + double y = _bounds.min().y() - buf->rect.min().y(); + + // Background + if (_use_background) { + if (_bg_rad == 0) { + buf->cr->rectangle(x, y, _bounds.width(), _bounds.height()); + } else { + double smallest = std::min(_bounds.width(), _bounds.height()); + double radius = _bg_rad * (smallest / 2); + buf->cr->arc(x + _bounds.width() - radius, + y + radius, + radius, + -M_PI_2, + 0); + + buf->cr->arc(x + _bounds.width() - radius, + y + _bounds.height() - radius, + radius, + 0, + M_PI_2); + + buf->cr->arc(x + radius, y + _bounds.height() - radius, + radius, + M_PI_2, + M_PI); + + buf->cr->arc(x + radius, + y + radius, + radius, + M_PI, + 3*M_PI_2); + } + buf->cr->set_line_width(2); + buf->cr->set_source_rgba(SP_RGBA32_R_F(_background), SP_RGBA32_G_F(_background), + SP_RGBA32_B_F(_background), SP_RGBA32_A_F(_background)); + buf->cr->fill(); + } + + // Center the text inside the draw background box + auto bx = x + _bounds.width()/2.0; + auto by = y + _bounds.height()/2.0; + buf->cr->move_to(int(bx - _text_size.x_bearing - _text_size.width/2.0), + int(by - _text_size.y_bearing - _text_extent.height/2.0)); + + buf->cr->select_font_face(_fontname, Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_NORMAL); + buf->cr->set_font_size(_fontsize); + buf->cr->text_path(_text); + buf->cr->set_source_rgba(SP_RGBA32_R_F(_fill), SP_RGBA32_G_F(_fill), + SP_RGBA32_B_F(_fill), SP_RGBA32_A_F(_fill)); + buf->cr->fill(); + +#ifdef CANVAS_ITEM_DEBUG + Geom::Rect bounds = _bounds; + bounds.expandBy(-1); + bounds -= buf->rect.min(); + buf->cr->set_source_rgba(1.0, 0.0, 0.0, 1.0); + buf->cr->rectangle(bounds.min().x(), bounds.min().y(), bounds.width(), bounds.height()); + buf->cr->stroke(); +#endif + + buf->cr->restore(); +} + +void CanvasItemText::set_text(Glib::ustring const &text) +{ + if (_text != text) { + _text = text; + request_update(); // Might be larger than before! + } +} + +void CanvasItemText::set_fontsize(double fontsize) +{ + if (_fontsize != fontsize) { + _fontsize = fontsize; + request_update(); // Might be larger than before! + } +} + +void CanvasItemText::set_background(guint32 background) +{ + if (_background != background) { + _background = background; + request_redraw(); + } + _use_background = true; +} + +/** + * Set the anchor point, x and y between 0.0 and 1.0. + */ +void CanvasItemText::set_anchor(Geom::Point const &anchor_pt) +{ + if (_anchor_position != anchor_pt) { + _anchor_position = anchor_pt; + _canvas->request_update(); + } +} + +void CanvasItemText::set_adjust(Geom::Point const &adjust_pt) +{ + if (_adjust_offset != adjust_pt) { + _adjust_offset = adjust_pt; + _canvas->request_update(); + } +} + +void CanvasItemText::set_fixed_line(bool fixed_line) +{ + if (_fixed_line != fixed_line) { + _fixed_line = fixed_line; + _canvas->request_update(); + } +} + +} // namespace Inkscape + +/* FROM: http://lists.cairographics.org/archives/cairo-bugs/2009-March/003014.html + - Glyph surfaces: In most font rendering systems, glyph surfaces + have an origin at (0,0) and a bounding box that is typically + represented as (x_bearing,y_bearing,width,height). Depending on + which way y progresses in the system, y_bearing may typically be + negative (for systems similar to cairo, with origin at top left), + or be positive (in systems like PDF with origin at bottom left). + No matter which is the case, it is important to note that + (x_bearing,y_bearing) is the coordinates of top-left of the glyph + relative to the glyph origin. That is, for example: + + Scaled-glyph space: + + (x_bearing,y_bearing) <-- negative numbers + +----------------+ + | . | + | . | + |......(0,0) <---|-- glyph origin + | | + | | + +----------------+ + (width+x_bearing,height+y_bearing) + + Note the similarity of the origin to the device space. That is + exactly how we use the device_offset to represent scaled glyphs: + to use the device-space origin as the glyph origin. +*/ + +/* + 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 : |