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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
*
* Page size preview widget
*/
/*
* Authors:
* Mike Kowalski
*
* Copyright (C) 2021 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "page-size-preview.h"
#include "display/cairo-utils.h"
#include "2geom/rect.h"
namespace Inkscape {
namespace UI {
namespace Widget {
PageSizePreview::PageSizePreview() {
show();
}
void rounded_rectangle(const Cairo::RefPtr<Cairo::Context>& cr, double x, double y, double w, double h, double r) {
cr->begin_new_sub_path();
cr->arc(x + r, y + r, r, M_PI, 3 * M_PI / 2);
cr->arc(x + w - r, y + r, r, 3 * M_PI / 2, 2 * M_PI);
cr->arc(x + w - r, y + h - r, r, 0, M_PI / 2);
cr->arc(x + r, y + h - r, r, M_PI / 2, M_PI);
cr->close_path();
}
void set_source_rgba(const Cairo::RefPtr<Cairo::Context>& ctx, unsigned int rgba) {
ctx->set_source_rgba(SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_B_F(rgba), SP_RGBA32_A_F(rgba));
}
bool PageSizePreview::on_draw(const Cairo::RefPtr<Cairo::Context>& ctx) {
auto alloc = get_allocation();
double width = alloc.get_width();
double height = alloc.get_height();
// too small to fit anything?
if (width <= 2 || height <= 2) return false;
double x = 0;//alloc.get_x();
double y = 0;//alloc.get_y();
if (_draw_checkerboard) {
// auto device_scale = get_scale_factor();
Cairo::RefPtr<Cairo::Pattern> pattern(new Cairo::Pattern(ink_cairo_pattern_create_checkerboard(_desk_color)));
ctx->save();
ctx->set_operator(Cairo::OPERATOR_SOURCE);
ctx->set_source(pattern);
rounded_rectangle(ctx, x, y, width, height, 2.0);
ctx->fill();
ctx->restore();
}
else {
rounded_rectangle(ctx, x, y, width, height, 2.0);
set_source_rgba(ctx, _desk_color);
ctx->fill();
}
// use lesser dimension to prevent page from changing size when
// switching from portrait to landscape or vice versa
auto size = std::round(std::min(width, height) * 0.90); // 90% to leave margins
double w, h;
if (_width > _height) {
w = size;
h = std::round(size * _height / _width);
}
else {
h = size;
w = std::round(size * _width / _height);
}
if (w < 2) w = 2;
if (h < 2) h = 2;
// center page
double ox = std::round(x + (width - w) / 2);
double oy = std::round(y + (height - h) / 2);
Geom::Rect rect(ox, oy, ox + w, oy + h);
ctx->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
if (_draw_checkerboard) {
Cairo::RefPtr<Cairo::Pattern> pattern(new Cairo::Pattern(ink_cairo_pattern_create_checkerboard(_page_color)));
ctx->save();
ctx->set_operator(Cairo::OPERATOR_SOURCE);
ctx->set_source(pattern);
ctx->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
ctx->fill();
ctx->restore();
}
else {
ctx->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
set_source_rgba(ctx, _page_color | 0xff);
ctx->fill();
}
// draw cross
{
double gradient_size = 4;
double cx = std::round(x + (width - gradient_size) / 2);
double cy = std::round(y + (height - gradient_size) / 2);
auto horz = Cairo::LinearGradient::create(x, cy, x, cy + gradient_size);
auto vert = Cairo::LinearGradient::create(cx, y, cx + gradient_size, y);
horz->add_color_stop_rgba(0.0, 0, 0, 0, 0.0);
horz->add_color_stop_rgba(0.5, 0, 0, 0, 0.2);
horz->add_color_stop_rgba(0.5, 1, 1, 1, 0.8);
horz->add_color_stop_rgba(1.0, 1, 1, 1, 0.0);
vert->add_color_stop_rgba(0.0, 0, 0, 0, 0.0);
vert->add_color_stop_rgba(0.5, 0, 0, 0, 0.2);
vert->add_color_stop_rgba(0.5, 1, 1, 1, 0.8);
vert->add_color_stop_rgba(1.0, 1, 1, 1, 0.0);
ctx->rectangle(x, cy, width, gradient_size);
ctx->set_source(horz);
ctx->fill();
ctx->rectangle(cx, y, gradient_size, height);
ctx->set_source(vert);
ctx->fill();
}
ctx->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
set_source_rgba(ctx, _page_color);
ctx->fill();
if (_draw_border) {
// stoke; not pixel aligned, just like page on canvas
ctx->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
set_source_rgba(ctx, _border_color);
ctx->set_line_width(1);
ctx->stroke();
if (_draw_shadow) {
const auto a = (exp(-3 * SP_RGBA32_A_F(_border_color)) - 1) / (exp(-3) - 1);
ink_cairo_draw_drop_shadow(ctx, rect, 12, _border_color, a);
}
}
return true;
}
void PageSizePreview::draw_border(bool border) {
_draw_border = border;
queue_draw();
}
void PageSizePreview::set_desk_color(unsigned int rgba) {
_desk_color = rgba | 0xff; // desk always opaque
queue_draw();
}
void PageSizePreview::set_page_color(unsigned int rgba) {
_page_color = rgba;
queue_draw();
}
void PageSizePreview::set_border_color(unsigned int rgba) {
_border_color = rgba;
queue_draw();
}
void PageSizePreview::enable_drop_shadow(bool shadow) {
_draw_shadow = shadow;
queue_draw();
}
void PageSizePreview::enable_checkerboard(bool checkerboard) {
_draw_checkerboard = checkerboard;
queue_draw();
}
void PageSizePreview::set_page_size(double width, double height) {
_width = width;
_height = height;
queue_draw();
}
} } } // namespace Inkscape/Widget/UI
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