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| − | An example from [http://antigrain.com The Antigrain Graphics (AGG)] code extended to 7 vertices.
| + | <big>'''Note:''' We are migrating this content to the slicer.org domain - <font color="orange">The newer page is [https://www.slicer.org/wiki/Slicer3:Editor:Rasterizing:AGGextended_demo here]</font></big>a |
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| − | [[Image:Agg-intersection.png|right|thumb|202px]]
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| − | <nowiki>
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| − | #include "agg_basics.h"
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| − | #include "agg_rendering_buffer.h"
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| − | #include "agg_rasterizer_scanline_aa.h"
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| − | #include "agg_scanline_u.h"
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| − | #include "agg_renderer_scanline.h"
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| − | #include "agg_pixfmt_rgb.h"
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| − | #include "platform/agg_platform_support.h"
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| − | #include "ctrl/agg_slider_ctrl.h"
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| − | #include "ctrl/agg_cbox_ctrl.h"
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| − |
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| − | enum flip_y_e { flip_y = true };
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| − |
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| − | #define NUMPOINTS 7
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| − |
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| − | namespace agg
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| − | {
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| − |
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| − | class square
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| − | {
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| − | public:
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| − | square(double size) : m_size(size) {}
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| − |
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| − | template<class Rasterizer, class Scanline, class Renderer, class ColorT>
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| − | void draw(Rasterizer& ras, Scanline& sl, Renderer& ren, ColorT color,
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| − | double x, double y)
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| − | {
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| − | ras.reset();
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| − | ras.move_to_d(x*m_size, y*m_size);
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| − | ras.line_to_d(x*m_size+m_size, y*m_size);
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| − | ras.line_to_d(x*m_size+m_size, y*m_size+m_size);
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| − | ras.line_to_d(x*m_size, y*m_size+m_size);
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| − | agg::render_scanlines_aa_solid(ras, sl, ren, color);
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| − | }
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| − |
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| − | private:
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| − | double m_size;
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| − | };
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| − |
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| − |
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| − |
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| − | template<class Renderer> class renderer_enlarged
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| − | {
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| − | public:
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| − | renderer_enlarged(Renderer& ren, double size) :
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| − | m_ren(ren),
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| − | m_square(size),
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| − | m_size(size) {}
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| − |
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| − | //--------------------------------------------------------------------
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| − | void color(rgba8 c) { m_color = c; }
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| − |
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| − | //--------------------------------------------------------------------
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| − | void prepare() {}
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| − |
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| − | //--------------------------------------------------------------------
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| − | template<class Scanline> void render(const Scanline& sl)
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| − | {
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| − | int y = sl.y();
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| − |
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| − | unsigned num_spans = sl.num_spans();
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| − | typename Scanline::const_iterator span = sl.begin();
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| − |
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| − | do
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| − | {
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| − | int x = span->x;
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| − | const typename Scanline::cover_type* covers = span->covers;
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| − | int num_pix = span->len;
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| − |
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| − | do
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| − | {
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| − | int a = (*covers++ * m_color.a) >> 8;
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| − | m_square.draw(m_ras, m_sl, m_ren,
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| − | rgba8(m_color.r, m_color.g, m_color.b, a),
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| − | x, y);
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| − | ++x;
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| − | }
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| − | while(--num_pix);
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| − | }
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| − | while(--num_spans);
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| − | }
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| − |
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| − | private:
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| − | rasterizer_scanline_aa<> m_ras;
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| − | scanline_u8 m_sl;
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| − | Renderer& m_ren;
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| − | square m_square;
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| − | rgba8 m_color;
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| − | double m_size;
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| − | };
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| − |
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| − |
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| − |
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| − | };
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| − | class the_application : public agg::platform_support
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| − | {
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| − | double m_x[NUMPOINTS];
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| − | double m_y[NUMPOINTS];
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| − | double m_dx;
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| − | double m_dy;
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| − | int m_idx;
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| − | int m_numPoints;
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| − |
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| − | agg::slider_ctrl<agg::rgba8> m_slider1;
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| − | agg::slider_ctrl<agg::rgba8> m_slider2;
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| − |
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| − | public:
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| − | the_application(agg::pix_format_e format, bool flip_y) :
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| − | agg::platform_support(format, flip_y),
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| − | m_slider1(80, 10, 600-10, 19, !flip_y),
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| − | m_slider2(80, 10+20, 600-10, 19+20, !flip_y)
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| − | {
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| − | m_idx = -1;
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| − | m_numPoints = NUMPOINTS;
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| − | m_x[0] = 57; m_y[0] = 100;
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| − | m_x[1] = 369; m_y[1] = 170;
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| − | m_x[2] = 143; m_y[2] = 310;
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| − | m_x[3] = 153; m_y[3] = 310;
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| − | m_x[4] = 143; m_y[4] = 360;
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| − | m_x[5] = 173; m_y[5] = 360;
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| − | m_x[6] = 173; m_y[6] = 380;
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| − |
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| − | add_ctrl(m_slider1);
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| − | add_ctrl(m_slider2);
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| − |
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| − | m_slider1.range(8.0, 100.0);
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| − | m_slider1.num_steps(23);
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| − | m_slider1.value(32.0);
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| − |
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| − | m_slider2.range(0.1, 3.0);
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| − | m_slider2.value(1.0);
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| − |
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| − | m_slider1.label("Pixel size=%1.0f");
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| − | m_slider2.label("Gamma=%4.3f");
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| − |
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| − | m_slider1.no_transform();
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| − | m_slider2.no_transform();
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| − | }
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| − |
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| − |
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| − | virtual ~the_application()
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| − | {
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| − | }
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| − |
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| − |
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| − | virtual void on_init()
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| − | {
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| − | }
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| − |
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| − |
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| − | virtual void on_draw()
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| − | {
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| − | typedef agg::renderer_base<agg::pixfmt_bgr24> ren_base;
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| − |
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| − | agg::pixfmt_bgr24 pixf(rbuf_window());
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| − | ren_base ren(pixf);
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| − | agg::scanline_u8 sl;
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| − |
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| − | ren.clear(agg::rgba(1,1,1));
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| − |
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| − | agg::rasterizer_scanline_aa<> ras;
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| − |
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| − | int size_mul = int(m_slider1.value());
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| − |
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| − | ras.gamma(agg::gamma_power(m_slider2.value()));
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| − | ras.filling_rule(agg::fill_even_odd);
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| − |
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| − | agg::renderer_enlarged<ren_base> ren_en(ren, size_mul);
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| − |
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| − | ras.reset();
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| − |
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| − | ras.move_to_d(m_x[0]/size_mul, m_y[0]/size_mul);
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| − | for (int i = 0; i < m_numPoints; i++)
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| − | {
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| − | ras.line_to_d(m_x[i]/size_mul, m_y[i]/size_mul);
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| − | }
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| − |
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| − | ren_en.color(agg::rgba8(0,255,0, 255));
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| − | agg::render_scanlines(ras, sl, ren_en);
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| − |
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| − |
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| − | agg::render_scanlines_aa_solid(ras, sl, ren, agg::rgba8(0,0,0));
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| − |
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| − | ras.gamma(agg::gamma_none());
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| − |
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| − | agg::path_storage ps;
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| − | agg::conv_stroke<agg::path_storage> pg(ps);
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| − | pg.width(2.0);
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| − |
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| − | for (int i = 0; i < m_numPoints; i++)
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| − | {
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| − | int nextPoint = (i+1)%m_numPoints;
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| − | ps.remove_all();
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| − | ps.move_to(m_x[i], m_y[i]);
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| − | ps.line_to(m_x[nextPoint], m_y[nextPoint]);
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| − | ras.add_path(pg);
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| − | agg::render_scanlines_aa_solid(ras, sl, ren, agg::rgba8(0,150,160, 200));
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| − | }
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| − |
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| − |
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| − | // Render the controls
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| − | agg::render_ctrl(ras, sl, ren, m_slider1);
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| − | agg::render_ctrl(ras, sl, ren, m_slider2);
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| − | }
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| − | | |
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| − |
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| − |
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| − | virtual void on_mouse_button_down(int x, int y, unsigned flags)
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| − | {
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| − | if(flags & agg::mouse_left)
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| − | {
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| − | unsigned i;
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| − | for (i = 0; i < m_numPoints; i++)
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| − | {
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| − | if(sqrt( (x-m_x[i]) * (x-m_x[i]) + (y-m_y[i]) * (y-m_y[i]) ) < 10.0)
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| − | {
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| − | m_dx = x - m_x[i];
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| − | m_dy = y - m_y[i];
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| − | m_idx = i;
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| − | break;
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| − | }
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| − | }
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| − | if(i == m_numPoints + 1)
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| − | {
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| − | if(agg::point_in_triangle(m_x[0], m_y[0],
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| − | m_x[1], m_y[1],
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| − | m_x[2], m_y[2],
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| − | x, y))
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| − | {
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| − | m_dx = x - m_x[0];
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| − | m_dy = y - m_y[0];
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| − | m_idx = m_numPoints + 1;
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| − | }
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| − | }
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| − | }
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| − | }
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| − |
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| − |
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| − | virtual void on_mouse_move(int x, int y, unsigned flags)
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| − | {
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| − | if(flags & agg::mouse_left)
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| − | {
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| − | if(m_idx == m_numPoints + 1)
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| − | {
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| − | double dx = x - m_dx;
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| − | double dy = y - m_dy;
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| − | m_x[1] -= m_x[0] - dx;
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| − | m_y[1] -= m_y[0] - dy;
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| − | m_x[2] -= m_x[0] - dx;
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| − | m_y[2] -= m_y[0] - dy;
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| − | m_x[0] = dx;
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| − | m_y[0] = dy;
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| − | force_redraw();
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| − | return;
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| − | }
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| − |
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| − | if(m_idx >= 0)
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| − | {
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| − | m_x[m_idx] = x - m_dx;
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| − | m_y[m_idx] = y - m_dy;
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| − | force_redraw();
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| − | }
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| − | }
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| − | else
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| − | {
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| − | on_mouse_button_up(x, y, flags);
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| − | }
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| − | }
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| − |
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| − | virtual void on_mouse_button_up(int x, int y, unsigned flags)
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| − | {
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| − | m_idx = -1;
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| − | }
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| − | };
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| − |
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| − |
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| − | int agg_main(int argc, char* argv[])
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| − | {
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| − | the_application app(agg::pix_format_bgr24, flip_y);
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| − | app.caption("AGG Example. Anti-Aliasing Demo");
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| − |
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| − | if(app.init(600, 400, agg::window_resize))
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| − | {
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| − | return app.run();
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| − | }
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| − | return 1;
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| − | }
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| − |
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| − |
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| − |
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| − |
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| − |
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| − | </nowiki>
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