6 #include <xcb/xcb_aux.h>
7 #include <xcb/xcb_image.h>
8 #define XCB_ALL_PLANES ~0
15 /* Parameters of the fractal */
17 /* double cr = -0.7927; */
18 /* double ci = 0.1609; */
20 /* double cr = 0.32; */
21 /* double ci = 0.043; */
23 /* double cr = -1.1380; */
24 /* double ci = -0.2403; */
26 /* double cr = -0.0986; */
27 /* double ci = -0.65186; */
29 /* double cr = -0.1225; */
30 /* double ci = 0.7449; */
34 double origin_x = -1.8;
35 double origin_y = -1.2;
39 /* Numbers of colors in the palette */
43 palette_julia (Data *datap)
45 xcb_alloc_color_reply_t *rep;
48 datap->palette = (uint32_t *)malloc (sizeof (uint32_t) * cmax);
50 for (i = 0 ; i < cmax ; i++)
53 rep = xcb_alloc_color_reply (datap->conn,
54 xcb_alloc_color (datap->conn,
59 rep = xcb_alloc_color_reply (datap->conn,
60 xcb_alloc_color (datap->conn,
62 65535, (i-127)<<9, 0),
65 rep = xcb_alloc_color_reply (datap->conn,
66 xcb_alloc_color (datap->conn,
68 65535, 65535, (i-255)<<10),
72 datap->palette[i] = 0;
74 datap->palette[i] = rep->pixel;
81 draw_julia (Data *datap)
87 datap->image = xcb_image_get (datap->conn, datap->draw,
89 XCB_ALL_PLANES, datap->format);
91 for (i = 0 ; i < datap->image->width ; i++)
92 for (j = 0 ; j < datap->image->height ; j++)
94 zr = origin_x + width * (double)i / (double)datap->image->width;
95 zi = origin_y + height * (double)j / (double)datap->image->height;
97 while ((zr*zr + zi*zi < 4.0) &&
101 zr = zr*zr - zi*zi + cr;
105 xcb_image_put_pixel (datap->image,
110 xcb_image_put (datap->conn, datap->draw, datap->gc, datap->image,
115 main (int argc, char *argv[])
118 xcb_screen_t *screen;
121 xcb_gcontext_t bgcolor;
125 xcb_rectangle_t rect_coord = { 0, 0, W_W, W_H};
126 xcb_generic_event_t *e;
129 data.conn = xcb_connect (0, &screen_num);
130 screen = xcb_aux_get_screen (data.conn, screen_num);
131 data.depth = xcb_aux_get_depth (data.conn, screen);
135 data.gc = xcb_generate_id (data.conn);
136 mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
137 valgc[0] = screen->black_pixel;
138 valgc[1] = 0; /* no graphics exposures */
139 xcb_create_gc (data.conn, data.gc, win, mask, valgc);
141 bgcolor = xcb_generate_id (data.conn);
142 mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
143 valgc[0] = screen->white_pixel;
144 valgc[1] = 0; /* no graphics exposures */
145 xcb_create_gc (data.conn, bgcolor, win, mask, valgc);
147 data.draw = xcb_generate_id (data.conn);
148 mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK | XCB_CW_DONT_PROPAGATE;
149 valwin[0] = screen->white_pixel;
150 valwin[1] = XCB_EVENT_MASK_KEY_RELEASE | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_EXPOSURE;
151 valwin[2] = XCB_EVENT_MASK_BUTTON_PRESS;
152 xcb_create_window (data.conn, 0,
157 XCB_WINDOW_CLASS_INPUT_OUTPUT,
160 xcb_map_window (data.conn, data.draw);
162 rect = xcb_generate_id (data.conn);
163 xcb_create_pixmap (data.conn, data.depth,
166 xcb_poly_fill_rectangle(data.conn, rect, bgcolor, 1, &rect_coord);
168 xcb_map_window (data.conn, data.draw);
170 data.format = XCB_IMAGE_FORMAT_Z_PIXMAP;
172 data.cmap = xcb_generate_id (data.conn);
173 xcb_create_colormap (data.conn,
174 XCB_COLORMAP_ALLOC_NONE,
177 screen->root_visual);
179 palette_julia (&data);
181 xcb_flush (data.conn);
183 while ((e = xcb_wait_for_event(data.conn)))
185 switch (e->response_type)
189 xcb_copy_area(data.conn, rect, data.draw, bgcolor,
190 0, 0, 0, 0, W_W, W_H);
192 xcb_flush (data.conn);
195 case XCB_KEY_RELEASE:
196 case XCB_BUTTON_RELEASE:
201 xcb_image_destroy (data.image);
203 xcb_disconnect (data.conn);