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123b5c9d34
This functon will draw an ellipse which is intersecting the corners of the rect given. It is a very naive implementation, taking 200 samples of points around the ellipse, and drawing straight lines between each of these points. The ellipses look good enough to me though!
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
#pragma once
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#include "Color.h"
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#include "Point.h"
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#include "Rect.h"
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#include "Size.h"
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#include <AK/String.h>
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#include <AK/Utf8View.h>
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#include <LibDraw/TextAlignment.h>
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#include <LibDraw/TextElision.h>
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class CharacterBitmap;
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class GlyphBitmap;
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class GraphicsBitmap;
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class Font;
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class Emoji;
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class Painter {
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public:
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explicit Painter(GraphicsBitmap&);
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~Painter();
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void clear_rect(const Rect&, Color);
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void fill_rect(const Rect&, Color);
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void fill_rect_with_gradient(const Rect&, Color gradient_start, Color gradient_end);
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void draw_rect(const Rect&, Color, bool rough = false);
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void draw_bitmap(const Point&, const CharacterBitmap&, Color = Color());
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void draw_bitmap(const Point&, const GlyphBitmap&, Color = Color());
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void draw_ellipse_intersecting(const Rect&, Color, int thickness = 1);
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void set_pixel(const Point&, Color);
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void draw_line(const Point&, const Point&, Color, int thickness = 1, bool dotted = false);
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void draw_scaled_bitmap(const Rect& dst_rect, const GraphicsBitmap&, const Rect& src_rect);
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void blit(const Point&, const GraphicsBitmap&, const Rect& src_rect, float opacity = 1.0f);
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void blit_dimmed(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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void draw_tiled_bitmap(const Rect& dst_rect, const GraphicsBitmap&);
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void blit_offset(const Point&, const GraphicsBitmap&, const Rect& src_rect, const Point&);
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void blit_scaled(const Rect&, const GraphicsBitmap&, const Rect&, float, float);
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void draw_text(const Rect&, const StringView&, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
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void draw_text(const Rect&, const StringView&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
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void draw_glyph(const Point&, char, Color);
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void draw_glyph(const Point&, char, const Font&, Color);
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void draw_emoji(const Point&, const GraphicsBitmap&, const Font&);
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void draw_glyph_or_emoji(const Point&, u32 codepoint, const Font&, Color);
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const Font& font() const { return *state().font; }
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void set_font(const Font& font) { state().font = &font; }
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enum class DrawOp {
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Copy,
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Xor
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};
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void set_draw_op(DrawOp op) { state().draw_op = op; }
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DrawOp draw_op() const { return state().draw_op; }
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void add_clip_rect(const Rect& rect);
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void clear_clip_rect();
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Rect clip_rect() const { return state().clip_rect; }
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void translate(int dx, int dy) { state().translation.move_by(dx, dy); }
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void translate(const Point& delta) { state().translation.move_by(delta); }
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Point translation() const { return state().translation; }
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GraphicsBitmap* target() { return m_target.ptr(); }
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void save() { m_state_stack.append(m_state_stack.last()); }
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void restore()
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{
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ASSERT(m_state_stack.size() > 1);
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m_state_stack.take_last();
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}
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protected:
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void set_pixel_with_draw_op(u32& pixel, const Color&);
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void fill_rect_with_draw_op(const Rect&, Color);
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void blit_with_alpha(const Point&, const GraphicsBitmap&, const Rect& src_rect);
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void blit_with_opacity(const Point&, const GraphicsBitmap&, const Rect& src_rect, float opacity);
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void draw_pixel(const Point&, Color, int thickness = 1);
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void draw_text_line(const Rect&, const Utf8View&, const Font&, TextAlignment, Color, TextElision);
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struct State {
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const Font* font;
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Point translation;
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Rect clip_rect;
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DrawOp draw_op;
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};
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State& state() { return m_state_stack.last(); }
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const State& state() const { return m_state_stack.last(); }
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Rect m_clip_origin;
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NonnullRefPtr<GraphicsBitmap> m_target;
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Vector<State, 4> m_state_stack;
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};
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class PainterStateSaver {
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public:
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explicit PainterStateSaver(Painter&);
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~PainterStateSaver();
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private:
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Painter& m_painter;
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};
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