#include <stdlib.h> #include <ctype.h> #include <stdio.h> #include "agg_basics.h" #include "agg_rendering_buffer.h" #include "agg_rasterizer_scanline_aa.h" #include "agg_scanline_u.h" #include "agg_renderer_scanline.h" #include "agg_path_storage.h" #include "agg_conv_transform.h" #include "agg_trans_affine.h" #include "agg_trans_bilinear.h" #include "agg_trans_perspective.h" #include "agg_span_interpolator_linear.h" #include "agg_span_interpolator_trans.h" #include "agg_span_allocator.h" #include "agg_image_accessors.h" #include "ctrl/agg_rbox_ctrl.h" #include "platform/agg_platform_support.h" #include "interactive_polygon.h" #include "agg_pixfmt_rgb.h" #include "agg_span_image_filter_rgb.h" #define span_image_filter_2x2 agg::span_image_filter_rgb_2x2 #define span_image_filter_nn agg::span_image_filter_rgb_nn #define pix_format agg::pix_format_bgr24 typedef agg::pixfmt_bgr24 pixfmt; typedef agg::pixfmt_bgr24_pre pixfmt_pre; typedef pixfmt::color_type color_type; enum flip_y_e { flip_y = true }; agg::rasterizer_scanline_aa<> g_rasterizer; agg::scanline_u8 g_scanline; double g_x1 = 0; double g_y1 = 0; double g_x2 = 0; double g_y2 = 0; class the_application : public agg::platform_support { public: typedef agg::renderer_base<pixfmt> renderer_base; typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_solid; typedef agg::renderer_base<pixfmt_pre> renderer_base_pre; agg::interactive_polygon m_quad; agg::rbox_ctrl<agg::rgba> m_trans_type; bool m_test_flag; the_application(agg::pix_format_e format, bool flip_y) : agg::platform_support(format, flip_y), m_quad(4, 5.0), m_trans_type(460, 5.0, 420+170.0, 60.0, !flip_y), m_test_flag(false) { m_trans_type.text_size(8); m_trans_type.text_thickness(1); m_trans_type.add_item("Affine"); m_trans_type.add_item("Bilinear"); m_trans_type.add_item("Perspective"); m_trans_type.cur_item(2); add_ctrl(m_trans_type); } virtual void on_init() { g_x1 = -150; g_y1 = -150; g_x2 = 150; g_y2 = 150; double trans_x1 = -200; double trans_y1 = -200; double trans_x2 = 200; double trans_y2 = 200; double dx = width() / 2.0 - (trans_x2 + trans_x1) / 2.0; double dy = height() / 2.0 - (trans_y2 + trans_y1) / 2.0; m_quad.xn(0) = floor(trans_x1 + dx); m_quad.yn(0) = floor(trans_y1 + dy); m_quad.xn(1) = floor(trans_x2 + dx); m_quad.yn(1) = floor(trans_y1 + dy); m_quad.xn(2) = floor(trans_x2 + dx); m_quad.yn(2) = floor(trans_y2 + dy); m_quad.xn(3) = floor(trans_x1 + dx); m_quad.yn(3) = floor(trans_y2 + dy); } virtual void on_draw() { pixfmt pixf(rbuf_window()); pixfmt_pre pixf_pre(rbuf_window()); renderer_base rb(pixf); renderer_base_pre rb_pre(pixf_pre); if(!m_test_flag) { rb.clear(agg::rgba(1, 1, 1)); } if(m_trans_type.cur_item() == 0) { // For the affine parallelogram transformations we // calculate the 4-th (implicit) point of the parallelogram m_quad.xn(3) = m_quad.xn(0) + (m_quad.xn(2) - m_quad.xn(1)); m_quad.yn(3) = m_quad.yn(0) + (m_quad.yn(2) - m_quad.yn(1)); } if(!m_test_flag) { //-------------------------- // Render the "quad" tool and controls g_rasterizer.add_path(m_quad); agg::render_scanlines_aa_solid(g_rasterizer, g_scanline, rb, agg::rgba(0, 0.3, 0.5, 0.6)); //-------------------------- agg::render_ctrl(g_rasterizer, g_scanline, rb, m_trans_type); } // Prepare the polygon to rasterize. Here we need to fill // the destination (transformed) polygon. g_rasterizer.clip_box(0, 0, width(), height()); g_rasterizer.reset(); g_rasterizer.move_to_d(m_quad.xn(0), m_quad.yn(0)); g_rasterizer.line_to_d(m_quad.xn(1), m_quad.yn(1)); g_rasterizer.line_to_d(m_quad.xn(2), m_quad.yn(2)); g_rasterizer.line_to_d(m_quad.xn(3), m_quad.yn(3)); typedef agg::span_allocator<color_type> span_alloc_type; span_alloc_type sa; agg::image_filter<agg::image_filter_hanning> filter; typedef agg::wrap_mode_reflect_auto_pow2 remainder_type; typedef agg::image_accessor_wrap<pixfmt, remainder_type, remainder_type> img_source_type; pixfmt img_pixf(rbuf_img(0)); img_source_type img_src(img_pixf); enum subdiv_shift_e { subdiv_shift = 2 }; switch(m_trans_type.cur_item()) { case 0: { // Note that we consruct an affine matrix that transforms // a parallelogram to a rectangle, i.e., it's inverted. // It's actually the same as: // tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon()); // tr.invert(); agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2); // Also note that we can use the linear interpolator instead of // arbitrary span_interpolator_trans. It works much faster, // but the transformations must be linear and parellel. typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type; interpolator_type interpolator(tr); typedef span_image_filter_2x2<img_source_type, interpolator_type> span_gen_type; span_gen_type sg(img_src, interpolator, filter); agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg); break; } case 1: { agg::trans_bilinear tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2); if(tr.is_valid()) { typedef agg::span_interpolator_linear<agg::trans_bilinear> interpolator_type; interpolator_type interpolator(tr); typedef span_image_filter_2x2<img_source_type, interpolator_type> span_gen_type; span_gen_type sg(img_src, interpolator, filter); agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg); } break; } case 2: { agg::trans_perspective tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2); if(tr.is_valid()) { typedef agg::span_interpolator_linear_subdiv<agg::trans_perspective, 8> interpolator_type; interpolator_type interpolator(tr); typedef span_image_filter_2x2<img_source_type, interpolator_type> span_gen_type; span_gen_type sg(img_src, interpolator, filter); agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg); } break; } } } virtual void on_mouse_button_down(int x, int y, unsigned flags) { if(flags & agg::mouse_left) { if(m_quad.on_mouse_button_down(x, y)) { force_redraw(); } else { start_timer(); m_test_flag = true; on_draw(); on_draw(); on_draw(); on_draw(); char buf[100]; sprintf(buf, "time=%.3f", elapsed_time()); m_test_flag = false; force_redraw(); message(buf); } } } virtual void on_mouse_move(int x, int y, unsigned flags) { if(flags & agg::mouse_left) { if(m_quad.on_mouse_move(x, y)) { force_redraw(); } } if((flags & agg::mouse_left) == 0) { on_mouse_button_up(x, y, flags); } } virtual void on_mouse_button_up(int x, int y, unsigned flags) { if(m_quad.on_mouse_button_up(x, y)) { force_redraw(); } } }; int agg_main(int argc, char* argv[]) { the_application app(pix_format, flip_y); app.caption("AGG Example. Pattern Perspective Transformations"); const char* img_name = "agg"; if(argc >= 2) img_name = argv[1]; if(!app.load_img(0, img_name)) { char buf[256]; if(strcmp(img_name, "agg") == 0) { sprintf(buf, "File not found: %s%s. Download http://www.antigrain.com/%s%s\n" "or copy it from another directory if available.", img_name, app.img_ext(), img_name, app.img_ext()); } else { sprintf(buf, "File not found: %s%s", img_name, app.img_ext()); } app.message(buf); return 1; } if(app.init(600, 600, agg::window_resize)) { return app.run(); } return 1; } |