51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
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#include "xorrectangle.h"
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#include <gtk/gtk.h>
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bool XORRectangle::initialised() const
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{
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return !!cr;
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}
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void XORRectangle::lazy_init()
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{
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if (!initialised()) {
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cr = gdk_cairo_create(gtk_widget_get_window(m_widget));
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}
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}
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void XORRectangle::draw() const
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{
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const int x = float_to_integer(m_rectangle.x);
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const int y = float_to_integer(m_rectangle.y);
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const int w = float_to_integer(m_rectangle.w);
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const int h = float_to_integer(m_rectangle.h);
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GtkAllocation allocation;
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gtk_widget_get_allocation(m_widget, &allocation);
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cairo_rectangle(cr, x, -(h) - (y - allocation.height), w, h);
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cairo_set_source_rgb(cr, 1, 1, 1);
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cairo_set_operator(cr, CAIRO_OPERATOR_DIFFERENCE);
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cairo_stroke(cr);
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}
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XORRectangle::XORRectangle(ui::GLArea widget) : m_widget(widget), cr(0)
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{
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}
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XORRectangle::~XORRectangle()
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{
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if (initialised()) {
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cairo_destroy(cr);
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}
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}
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void XORRectangle::set(rectangle_t rectangle)
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{
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if (gtk_widget_get_realized(m_widget)) {
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lazy_init();
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draw();
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m_rectangle = rectangle;
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draw();
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}
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}
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