first animation

tinyraycaster.cpp

@@ -2,6 +2,8 @@
 #include <cmath>
 #include <iostream>
 #include <fstream>
+#include <sstream>
+#include <iomanip>
 #include <vector>
 #include <cstdint>
 #include <cassert>
@@ -35,7 +37,7 @@ void draw_rectangle(std::vector<uint32_t> &img, const size_t img_w, const size_t
         for (size_t j=0; j<h; j++) {
             size_t cx = x+i;
             size_t cy = y+j;
-            if (cx>=img_w || cy>=img_h) continue; // no need to check negative values, (unsigned variables)
+            if (cx>=img_w || cy>=img_h) continue; // no need to check for negative values (unsigned variables)
             img[cx + cy*img_w] = color;
         }
     }
@@ -70,37 +72,54 @@ int main() {
     float player_a = 1.523; // player view direction
     const float fov = M_PI/3.; // field of view
 
+    const size_t ncolors = 10;
+    std::vector<uint32_t> colors(ncolors);
+    for (size_t i=0; i<ncolors; i++) {
+        colors[i] = pack_color(rand()%255, rand()%255, rand()%255);
+    }
+
     const size_t rect_w = win_w/(map_w*2);
     const size_t rect_h = win_h/map_h;
-    for (size_t j=0; j<map_h; j++) { // draw the map
-        for (size_t i=0; i<map_w; i++) {
-            if (map[i+j*map_w]==' ') continue; // skip empty spaces
-            size_t rect_x = i*rect_w;
-            size_t rect_y = j*rect_h;
-            draw_rectangle(framebuffer, win_w, win_h, rect_x, rect_y, rect_w, rect_h, pack_color(0, 255, 255));
+    for (size_t frame=0; frame<360; frame++) {
+        std::stringstream ss;
+        ss << std::setfill('0') << std::setw(5) << frame << ".ppm";
+        player_a += 2*M_PI/360;
+
+        framebuffer = std::vector<uint32_t>(win_w*win_h, pack_color(255, 255, 255)); // clear the screen
+
+        for (size_t j=0; j<map_h; j++) { // draw the map
+            for (size_t i=0; i<map_w; i++) {
+                if (map[i+j*map_w]==' ') continue; // skip empty spaces
+                size_t rect_x = i*rect_w;
+                size_t rect_y = j*rect_h;
+                size_t icolor = map[i+j*map_w] - '0';
+                assert(icolor<ncolors);
+                draw_rectangle(framebuffer, win_w, win_h, rect_x, rect_y, rect_w, rect_h, colors[icolor]);
+            }
         }
-    }
 
-    for (size_t i=0; i<win_w/2; i++) { // draw the visibility cone AND the "3D" view
-        float angle = player_a-fov/2 + fov*i/float(win_w/2);
-        for (float t=0; t<20; t+=.05) {
-            float cx = player_x + t*cos(angle);
-            float cy = player_y + t*sin(angle);
+        for (size_t i=0; i<win_w/2; i++) { // draw the visibility cone AND the "3D" view
+            float angle = player_a-fov/2 + fov*i/float(win_w/2);
+            for (float t=0; t<20; t+=.01) {
+                float cx = player_x + t*cos(angle);
+                float cy = player_y + t*sin(angle);
 
-            size_t pix_x = cx*rect_w;
-            size_t pix_y = cy*rect_h;
-            framebuffer[pix_x + pix_y*win_w] = pack_color(160, 160, 160); // this draws the visibility cone
+                size_t pix_x = cx*rect_w;
+                size_t pix_y = cy*rect_h;
+                framebuffer[pix_x + pix_y*win_w] = pack_color(160, 160, 160); // this draws the visibility cone
 
-            if (map[int(cx)+int(cy)*map_w]!=' ') { // our ray touches a wall, so draw the vertical column to create an illusion of 3D
-                size_t column_height = win_h/t;
-                draw_rectangle(framebuffer, win_w, win_h, win_w/2+i, win_h/2-column_height/2, 1, column_height, pack_color(0, 255, 255));
-                break;
+                if (map[int(cx)+int(cy)*map_w]!=' ') { // our ray touches a wall, so draw the vertical column to create an illusion of 3D
+                    size_t icolor = map[int(cx)+int(cy)*map_w] - '0';
+                    assert(icolor<ncolors);
+                    size_t column_height = win_h/t;
+                    draw_rectangle(framebuffer, win_w, win_h, win_w/2+i, win_h/2-column_height/2, 1, column_height, colors[icolor]);
+                    break;
+                }
             }
         }
+        drop_ppm_image(ss.str(), framebuffer, win_w, win_h);
     }
 
-    drop_ppm_image("./out.ppm", framebuffer, win_w, win_h);
-
     return 0;
 }