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annotate examples/example-drawable.c @ 159:e05a792f6910

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ui: make message less clever and provide spacing field
author David Demelier <markand@malikania.fr>
date Fri, 16 Oct 2020 18:44:05 +0200
parents c3a40062acc2
children f6497ec74b49
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1 /*
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2 * example-drawable.c -- example on how to use automatic drawables
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
136
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19 #include <stdlib.h>
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20
129
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21 #include <core/animation.h>
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22 #include <core/clock.h>
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23 #include <core/core.h>
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24 #include <core/event.h>
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25 #include <core/drawable.h>
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26 #include <core/key.h>
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27 #include <core/painter.h>
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28 #include <core/panic.h>
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29 #include <core/sys.h>
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30 #include <core/image.h>
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31 #include <core/sprite.h>
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32 #include <core/texture.h>
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33 #include <core/util.h>
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34 #include <core/window.h>
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35
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36 #include <ui/label.h>
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37 #include <ui/theme.h>
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38 #include <ui/ui.h>
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39
129
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40 #include <assets/sprites/explosion.h>
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41
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42 #define W 1280
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43 #define H 720
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44
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45 static struct label help = {
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46 .x = 10,
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47 .y = 10,
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48 .text = "Keys: <Esc> to reset. Click anywhere to spawn a drawable.",
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49 .flags = LABEL_FLAGS_SHADOW
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50 };
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51
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52 static struct drawable_stack stack;
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53
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54 /*
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55 * List of drawables for this example.
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56 * -----------------------------------------------------------------------------
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57 */
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58
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59 /* 0: Explosion animation. */
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60 static struct texture explosion_tex;
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61 static struct sprite explosion_sprite;
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62
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63 struct explosion {
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64 struct animation anim;
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65 struct drawable dw;
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66 };
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67
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68 static void
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69 init(void)
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70 {
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71 if (!core_init() || !ui_init())
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72 panic();
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73 if (!window_open("Example - Drawable", W, H))
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74 panic();
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75
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76 /* 0: Explosion animation. */
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77 if (!image_openmem(&explosion_tex, sprites_explosion, sizeof (sprites_explosion)))
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78 panic();
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79
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80 sprite_init(&explosion_sprite, &explosion_tex, 256, 256);
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81 }
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82
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83 static void
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84 explosion_finish(struct drawable *dw)
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85 {
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86 free(dw->data);
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87 }
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88
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89 static void
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90 spawn(int x, int y)
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91 {
136
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92 struct explosion *expl = emalloc(sizeof (struct explosion));
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93
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94 animation_init(&expl->anim, &explosion_sprite, 100);
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95 animation_drawable(&expl->anim, &expl->dw, x, y);
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96
136
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97 /*
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98 * This work because the drawable->data field expects a struct animation
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99 * pointer which is the first member of struct explosion.
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100 *
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101 * Thus this "poor man inheritance" trick works perfectly in our case
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102 * and we simply need to free the whole explosion struct afterwards.
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103 */
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104 expl->dw.finish = explosion_finish;
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105
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106 drawable_stack_add(&stack, &expl->dw);
129
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107 }
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108
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109 static void
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110 run(void)
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111 {
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112 struct clock clock = {0};
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113
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114 clock_start(&clock);
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115
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116 for (;;) {
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117 union event ev;
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118 unsigned int elapsed = clock_elapsed(&clock);
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119
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120 clock_start(&clock);
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121
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122 while (event_poll(&ev)) {
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123 switch (ev.type) {
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124 case EVENT_KEYDOWN:
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125 switch (ev.key.key) {
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126 case KEY_ESCAPE:
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127 drawable_stack_finish(&stack);
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128 break;
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129 default:
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130 break;
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131 }
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132 break;
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133 case EVENT_CLICKDOWN:
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134 spawn(ev.click.x, ev.click.y);
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135 break;
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136 case EVENT_QUIT:
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137 return;
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138 default:
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139 break;
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140 }
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141 }
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142
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143 drawable_stack_update(&stack, elapsed);
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144 painter_set_color(0xebede9ff);
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145 painter_clear();
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146 label_draw(&help);
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147 drawable_stack_draw(&stack);
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148 painter_present();
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149
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150 if ((elapsed = clock_elapsed(&clock)) < 20)
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151 delay(20 - elapsed);
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152 }
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153 }
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154
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155 static void
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156 quit(void)
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157 {
156
c3a40062acc2 misc: create more generic startup function, closes #2500
David Demelier <markand@malikania.fr>
parents: 153
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158 window_finish();
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159 ui_finish();
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160 core_finish();
129
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161 }
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162
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163 int
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164 main(int argc, char **argv)
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165 {
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166 (void)argc;
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167 (void)argv;
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168
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169 init();
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170 run();
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171 quit();
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172 }