Mercurial > molko
comparison src/libmlk-core/core/painter.c @ 320:8f9937403749
misc: improve loading of data
author | David Demelier <markand@malikania.fr> |
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date | Fri, 01 Oct 2021 20:30:00 +0200 |
parents | libmlk-core/core/painter.c@d01e83210ca2 |
children | 460c78706989 |
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319:b843eef4cc35 | 320:8f9937403749 |
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1 /* | |
2 * painter.c -- basic drawing routines | |
3 * | |
4 * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr> | |
5 * | |
6 * Permission to use, copy, modify, and/or distribute this software for any | |
7 * purpose with or without fee is hereby granted, provided that the above | |
8 * copyright notice and this permission notice appear in all copies. | |
9 * | |
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 */ | |
18 | |
19 #include <math.h> | |
20 | |
21 #include "color.h" | |
22 #include "painter.h" | |
23 #include "texture.h" | |
24 #include "window.h" | |
25 #include "window_p.h" | |
26 | |
27 /* Current texture renderer. */ | |
28 static struct texture *renderer; | |
29 | |
30 struct texture * | |
31 painter_get_target(void) | |
32 { | |
33 return renderer; | |
34 } | |
35 | |
36 void | |
37 painter_set_target(struct texture *tex) | |
38 { | |
39 renderer = tex; | |
40 SDL_SetRenderTarget(RENDERER(), tex ? tex->handle : NULL); | |
41 } | |
42 | |
43 unsigned long | |
44 painter_get_color(void) | |
45 { | |
46 Uint8 r = 0, g = 0, b = 0, a = 0; | |
47 | |
48 SDL_GetRenderDrawColor(RENDERER(), &r, &g, &b, &a); | |
49 | |
50 return COLOR_HEX(r, g, b, a); | |
51 } | |
52 | |
53 void | |
54 painter_set_color(unsigned long color) | |
55 { | |
56 SDL_SetRenderDrawColor( | |
57 RENDERER(), | |
58 COLOR_R(color), | |
59 COLOR_G(color), | |
60 COLOR_B(color), | |
61 COLOR_A(color) | |
62 ); | |
63 } | |
64 | |
65 void | |
66 painter_draw_line(int x1, int y1, int x2, int y2) | |
67 { | |
68 SDL_RenderDrawLine(RENDERER(), x1, y1, x2, y2); | |
69 } | |
70 | |
71 void | |
72 painter_draw_point(int x1, int y1) | |
73 { | |
74 SDL_RenderDrawPoint(RENDERER(), x1, y1); | |
75 } | |
76 | |
77 void | |
78 painter_draw_rectangle(int x, int y, unsigned int width, unsigned int height) | |
79 { | |
80 const SDL_Rect rect = { | |
81 .w = width, | |
82 .h = height, | |
83 .x = x, | |
84 .y = y | |
85 }; | |
86 | |
87 SDL_RenderFillRect(RENDERER(), &rect); | |
88 } | |
89 | |
90 void | |
91 painter_draw_circle(int x, int y, int radius) | |
92 { | |
93 // Note that there is more to altering the bitrate of this | |
94 // method than just changing this value. See how pixels are | |
95 // altered at the following web page for tips: | |
96 // http://www.libsdl.org/intro.en/usingvideo.html | |
97 for (double dy = 1; dy <= radius; dy += 1.0) { | |
98 double dx = floor(sqrt((2.0 * radius * dy) - (dy * dy))); | |
99 | |
100 SDL_RenderDrawLine(RENDERER(), x - dx, y + dy - radius, x + dx, y + dy - radius); | |
101 SDL_RenderDrawLine(RENDERER(), x - dx, y - dy + radius, x + dx, y - dy + radius); | |
102 } | |
103 } | |
104 | |
105 void | |
106 painter_clear(void) | |
107 { | |
108 SDL_RenderClear(RENDERER()); | |
109 } | |
110 | |
111 void | |
112 painter_present(void) | |
113 { | |
114 SDL_RenderPresent(RENDERER()); | |
115 } |