walkero
/
agg
1
0
Fork 0
Code Issues Pull Requests 1 Projects Releases Wiki Activity
agg/examples/line_patterns_clip.cpp

354 lines
14 KiB
C++
Raw Blame History

#include <math.h>
#include <stdio.h>
#include <time.h>
#include "agg_math.h"
#include "agg_rendering_buffer.h"
#include "agg_conv_transform.h"
#include "agg_conv_stroke.h"
#include "agg_conv_clip_polyline.h"
#include "agg_scanline_p.h"
#include "agg_renderer_scanline.h"
#include "agg_rasterizer_outline_aa.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_pattern_filters_rgba.h"
#include "agg_renderer_outline_aa.h"
#include "agg_renderer_outline_image.h"
#include "agg_path_storage.h"
#include "agg_pixfmt_rgb.h"
#include "ctrl/agg_slider_ctrl.h"
#include "ctrl/agg_bezier_ctrl.h"
#include "platform/agg_platform_support.h"
#define AGG_BGRA32
//#define AGG_BGRA128
#include "pixel_formats.h"
enum flip_y_e { flip_y = true };
static agg::int8u brightness_to_alpha[256 * 3] =
{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 254, 254, 254, 254, 254,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 253, 253,
253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 252,
252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 251, 251, 251, 251, 251,
251, 251, 251, 251, 250, 250, 250, 250, 250, 250, 250, 250, 249, 249, 249, 249,
249, 249, 249, 248, 248, 248, 248, 248, 248, 248, 247, 247, 247, 247, 247, 246,
246, 246, 246, 246, 246, 245, 245, 245, 245, 245, 244, 244, 244, 244, 243, 243,
243, 243, 243, 242, 242, 242, 242, 241, 241, 241, 241, 240, 240, 240, 239, 239,
239, 239, 238, 238, 238, 238, 237, 237, 237, 236, 236, 236, 235, 235, 235, 234,
234, 234, 233, 233, 233, 232, 232, 232, 231, 231, 230, 230, 230, 229, 229, 229,
228, 228, 227, 227, 227, 226, 226, 225, 225, 224, 224, 224, 223, 223, 222, 222,
221, 221, 220, 220, 219, 219, 219, 218, 218, 217, 217, 216, 216, 215, 214, 214,
213, 213, 212, 212, 211, 211, 210, 210, 209, 209, 208, 207, 207, 206, 206, 205,
204, 204, 203, 203, 202, 201, 201, 200, 200, 199, 198, 198, 197, 196, 196, 195,
194, 194, 193, 192, 192, 191, 190, 190, 189, 188, 188, 187, 186, 186, 185, 184,
183, 183, 182, 181, 180, 180, 179, 178, 177, 177, 176, 175, 174, 174, 173, 172,
171, 171, 170, 169, 168, 167, 166, 166, 165, 164, 163, 162, 162, 161, 160, 159,
158, 157, 156, 156, 155, 154, 153, 152, 151, 150, 149, 148, 148, 147, 146, 145,
144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129,
128, 128, 127, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113,
112, 111, 110, 109, 108, 107, 106, 105, 104, 102, 101, 100, 99, 98, 97, 96,
95, 94, 93, 91, 90, 89, 88, 87, 86, 85, 84, 82, 81, 80, 79, 78,
77, 75, 74, 73, 72, 71, 70, 69, 67, 66, 65, 64, 63, 61, 60, 59,
58, 57, 56, 54, 53, 52, 51, 50, 48, 47, 46, 45, 44, 42, 41, 40,
39, 37, 36, 35, 34, 33, 31, 30, 29, 28, 27, 25, 24, 23, 22, 20,
19, 18, 17, 15, 14, 13, 12, 11, 9, 8, 7, 6, 4, 3, 2, 1
};
class pattern_src_brightness_to_alpha
{
public:
pattern_src_brightness_to_alpha(agg::rendering_buffer& rb) :
m_rb(&rb), m_pf(*m_rb) {}
unsigned width() const { return m_pf.width(); }
unsigned height() const { return m_pf.height(); }
color_type pixel(int x, int y) const
{
color_type c = m_pf.pixel(x, y);
// It's a bit of a hack, but we can treat the 8-bit alpha value as a cover.
color_type::calc_type sum = c.r + c.g + c.b;
int i = int(sum * sizeof(brightness_to_alpha) / (3 * color_type::full_value()));
agg::cover_type cover = brightness_to_alpha[i];
c.a = color_type::mult_cover(color_type::full_value(), cover);
return c;
}
private:
agg::rendering_buffer* m_rb;
pixfmt m_pf;
};
class the_application : public agg::platform_support
{
agg::srgba8 m_ctrl_color;
agg::polygon_ctrl<color_type> m_line1;
agg::slider_ctrl<color_type> m_scale_x;
agg::slider_ctrl<color_type> m_start_x;
agg::trans_affine m_scale;
public:
typedef agg::renderer_base<pixfmt> renderer_base;
typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_scanline;
typedef agg::rasterizer_scanline_aa<agg::rasterizer_sl_clip_int_sat> rasterizer_scanline;
typedef agg::scanline_p8 scanline;
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_ctrl_color(agg::rgba(0, 0.3, 0.5, 0.3)),
m_line1(5),
m_scale_x(5.0, 5.0, 240.0, 12.0, !flip_y),
m_start_x(250.0, 5.0, 495.0, 12.0, !flip_y)
{
m_line1.line_color(m_ctrl_color);
m_line1.xn(0) = 20;
m_line1.yn(0) = 20;
m_line1.xn(1) = 500-20;
m_line1.yn(1) = 500-20;
m_line1.xn(2) = 500-60;
m_line1.yn(2) = 20;
m_line1.xn(3) = 40;
m_line1.yn(3) = 500-40;
m_line1.xn(4) = 100;
m_line1.yn(4) = 300;
m_line1.close(false);
add_ctrl(m_line1);
m_line1.transform(m_scale);
m_scale_x.label("Scale X=%.2f");
m_scale_x.range(0.2, 3.0);
m_scale_x.value(1.0);
add_ctrl(m_scale_x);
m_scale_x.no_transform();
m_start_x.label("Start X=%.2f");
m_start_x.range(0.0, 10.0);
m_start_x.value(0.0);
add_ctrl(m_start_x);
m_start_x.no_transform();
}
template<class Rasterizer, class Renderer>
void draw_polyline(Rasterizer& ras,
Renderer& ren,
const double* polyline,
int num_points)
{
agg::poly_plain_adaptor<double> vs(polyline, num_points, m_line1.close());
agg::conv_transform<agg::poly_plain_adaptor<double> > trans(vs, m_scale);
ras.add_path(trans);
}
virtual void on_draw()
{
pixfmt pf(rbuf_window());
renderer_base ren_base(pf);
ren_base.clear(agg::rgba(0.5, 0.75, 0.85));
renderer_scanline ren(ren_base);
rasterizer_scanline ras;
scanline sl;
ras.clip_box(0, 0, width(), height());
// Pattern source. Must have an interface:
// width() const
// height() const
// pixel(int x, int y) const
// Any agg::renderer_base<> or derived
// is good for the use as a source.
//-----------------------------------
pattern_src_brightness_to_alpha p1(rbuf_img(0));
agg::pattern_filter_bilinear_rgba<color_type> fltr; // Filtering functor
// agg::line_image_pattern is the main container for the patterns. It creates
// a copy of the patterns extended according to the needs of the filter.
// agg::line_image_pattern can operate with arbitrary image width, but if the
// width of the pattern is power of 2, it's better to use the modified
// version agg::line_image_pattern_pow2 because it works about 15-25 percent
// faster than agg::line_image_pattern (because of using simple masking instead
// of expensive '%' operation).
typedef agg::line_image_pattern<agg::pattern_filter_bilinear_rgba<color_type> > pattern_type;
typedef agg::renderer_base<pixfmt> base_ren_type;
typedef agg::renderer_outline_image<base_ren_type, pattern_type> renderer_img_type;
typedef agg::rasterizer_outline_aa<renderer_img_type, agg::line_coord_sat> rasterizer_img_type;
typedef agg::renderer_outline_aa<base_ren_type> renderer_line_type;
typedef agg::rasterizer_outline_aa<renderer_line_type, agg::line_coord_sat> rasterizer_line_type;
//-- Create with specifying the source
//pattern_type patt(fltr, src);
//-- Create uninitialized and set the source
pattern_type patt(fltr);
patt.create(p1);
renderer_img_type ren_img(ren_base, patt);
rasterizer_img_type ras_img(ren_img);
//-- create uninitialized and set parameters
agg::line_profile_aa profile;
profile.smoother_width(10.0); //optional
profile.width(8.0); //mandatory!
renderer_line_type ren_line(ren_base, profile);
ren_line.color(agg::srgba8(0,0,127)); //mandatory!
rasterizer_line_type ras_line(ren_line);
ras_line.round_cap(true); //optional
//ras_line.line_join(agg::outline_no_join); //optional
// Calculate the dilation value so that, the line caps were
// drawn correctly.
//---------------
double w2 = 9.0;//p1.height() / 2 + 2;
// Set the clip box a bit bigger than you expect. You need it
// to draw the clipped line caps correctly. The correct result
// is achieved with raster clipping.
//------------------------
ren_img.scale_x(m_scale_x.value());
ren_img.start_x(m_start_x.value());
ren_img.clip_box (50-w2, 50-w2, width()-50+w2, height()-50+w2);
ren_line.clip_box(50-w2, 50-w2, width()-50+w2, height()-50+w2);
// First, draw polyline without raster clipping just to show the idea
//------------------------
draw_polyline(ras_line, ren_line, m_line1.polygon(), m_line1.num_points());
draw_polyline(ras_img, ren_img, m_line1.polygon(), m_line1.num_points());
// Clear the area, almost opaque, but not completely
//------------------------
ren_base.blend_bar(0, 0, (int)width(), (int)height(), agg::rgba(1,1,1), 200);
// Set the raster clip box and then, draw again.
// In reality there shouldn't be two calls above.
// It's done only for demonstration
//------------------------
ren_base.clip_box((int)50, (int)50, (int)width()-50, (int)height()-50);
// This "copy_bar" is also for demonstration only
//------------------------
ren_base.copy_bar(0, 0, (int)width(), (int)height(), agg::rgba(1,1,1));
// Finally draw polyline correctly clipped: We use double clipping,
// first is vector clipping, with extended clip box, second is raster
// clipping with normal clip box.
//------------------------
ren_img.scale_x(m_scale_x.value());
ren_img.start_x(m_start_x.value());
draw_polyline(ras_line, ren_line, m_line1.polygon(), m_line1.num_points());
draw_polyline(ras_img, ren_img, m_line1.polygon(), m_line1.num_points());
// Reset clipping and draw the controls and stuff
ren_base.reset_clipping(true);
m_line1.line_width(1/m_scale.scale());
m_line1.point_radius(5/m_scale.scale());
agg::render_ctrl(ras, sl, ren_base, m_line1);
agg::render_ctrl(ras, sl, ren_base, m_scale_x);
agg::render_ctrl(ras, sl, ren_base, m_start_x);
char buf[256];
agg::gsv_text t;
t.size(10.0);
agg::conv_stroke<agg::gsv_text> pt(t);
pt.width(1.5);
pt.line_cap(agg::round_cap);
const double* p = m_line1.polygon();
sprintf(buf, "Len=%.2f", agg::calc_distance(p[0], p[1], p[2], p[3]) * m_scale.scale());
t.start_point(10.0, 30.0);
t.text(buf);
ras.add_path(pt);
ren.color(agg::rgba(0,0,0));
agg::render_scanlines(ras, sl, ren);
}
virtual void on_key(int x, int y, unsigned key, unsigned flags)
{
if(key == '+' || key == agg::key_kp_plus)
{
m_scale *= agg::trans_affine_translation(-x, -y);
m_scale *= agg::trans_affine_scaling(1.1);
m_scale *= agg::trans_affine_translation(x, y);
force_redraw();
}
if(key == '-' || key == agg::key_kp_minus)
{
m_scale *= agg::trans_affine_translation(-x, -y);
m_scale *= agg::trans_affine_scaling(1/1.1);
m_scale *= agg::trans_affine_translation(x, y);
force_redraw();
}
}
virtual void on_ctrl_change()
{
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Clipping Lines with Image Patterns");
if(!app.load_img(0, "1"))
{
char buf[256];
sprintf(buf, "There must be file 1%s\n", app.img_ext());
app.message(buf);
return 1;
}
if(app.init(500, 500, agg::window_resize))
{
return app.run();
}
return 1;
}
Reference in New Issue View Git Blame Copy Permalink