Atlas - power.c
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[FILE BEGIN]
1/*
2 * This example code reports power status (plugged in, battery level, etc).
3 *
4 * This code is public domain. Feel free to use it for any purpose!
5 */
6
7#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
8#include <SDL3/SDL.h>
9#include <SDL3/SDL_main.h>
10
11/* We will use this renderer to draw into this window every frame. */
12static SDL_Window *window = NULL;
13static SDL_Renderer *renderer = NULL;
14
15/* This function runs once at startup. */
16SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
17{
18    SDL_SetAppMetadata("Example Misc Power", "1.0", "com.example.misc-power");
19
20    if (!SDL_Init(SDL_INIT_VIDEO)) {
21        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
22        return SDL_APP_FAILURE;
23    }
24
25    if (!SDL_CreateWindowAndRenderer("examples/misc/power", 640, 480, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
26        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
27        return SDL_APP_FAILURE;
28    }
29    SDL_SetRenderLogicalPresentation(renderer, 640, 480, SDL_LOGICAL_PRESENTATION_LETTERBOX);
30
31    return SDL_APP_CONTINUE;  /* carry on with the program! */
32}
33
34/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
35SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
36{
37    if (event->type == SDL_EVENT_QUIT) {
38        return SDL_APP_SUCCESS;  /* end the program, reporting success to the OS. */
39    }
40    return SDL_APP_CONTINUE;  /* carry on with the program! */
41}
42
43/* This function runs once per frame, and is the heart of the program. */
44SDL_AppResult SDL_AppIterate(void *appstate)
45{
46    const SDL_FRect frame = { 100, 200, 440, 80 };  /* the percentage bar dimensions. */
47
48    /* Query for battery info */
49    int seconds = 0, percent = 0;
50    const SDL_PowerState state = SDL_GetPowerInfo(&seconds, &percent);
51
52    /* We set up different drawing details for each power state, then
53       run it all through the same drawing code. */
54    int clearr = 0, clearg = 0, clearb = 0;  /* clear window to this color. */
55    int textr = 255, textg = 255, textb = 255;  /* draw messages in this color. */
56    int framer = 255, frameg = 255, frameb = 255;  /* draw a percentage bar frame in this color. */
57    int barr = 0, barg = 0, barb = 0;  /* draw a percentage bar in this color. */
58    const char *msg = NULL;
59    const char *msg2 = NULL;
60
61    switch (state) {
62        case SDL_POWERSTATE_ERROR:
63            msg2 = "ERROR GETTING POWER STATE";
64            msg = SDL_GetError();
65            clearr = 255;  /* red background */
66            break;
67
68        default:  /* in case this does something unexpected later, treat it as unknown. */
69        case SDL_POWERSTATE_UNKNOWN:
70            msg = "Power state is unknown.";
71            clearr = clearb = clearg = 50;  /* grey background */
72            break;
73
74        case SDL_POWERSTATE_ON_BATTERY:
75            msg = "Running on battery.";
76            barr = 255;  /* draw in red */
77            break;
78
79        case SDL_POWERSTATE_NO_BATTERY:
80            msg = "Plugged in, no battery available.";
81            clearg = 50;  /* green background */
82            break;
83
84        case SDL_POWERSTATE_CHARGING:
85            msg = "Charging.";
86            barb = barg = 255;  /* draw in cyan */
87            break;
88
89        case SDL_POWERSTATE_CHARGED:
90            msg = "Charged.";
91            barg = 255;  /* draw in green */
92            break;
93    }
94
95    SDL_SetRenderDrawColor(renderer, clearr, clearg, clearb, 255);
96    SDL_RenderClear(renderer);
97
98    if (percent >= 0) {
99        float x, y;
100        SDL_FRect pctrect;
101        char remainstr[64];
102        char msgbuf[128];
103        
104        SDL_copyp(&pctrect, &frame);
105        pctrect.w *= percent / 100.0f;
106
107        if (seconds < 0) {
108            SDL_strlcpy(remainstr, "unknown time", sizeof (remainstr));
109        } else {
110            int hours, minutes;
111            hours = seconds / (60 * 60);
112            seconds -= hours * (60 * 60);
113            minutes = seconds / 60;
114            seconds -= minutes * 60;
115            SDL_snprintf(remainstr, sizeof (remainstr), "%02d:%02d:%02d", hours, minutes, seconds);
116        }
117
118        SDL_snprintf(msgbuf, sizeof (msgbuf), "Battery: %3d percent, %s remaining", percent, remainstr);
119        x  = frame.x + ((frame.w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(msgbuf))) / 2.0f);
120        y = frame.y + frame.h + SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE;
121
122        SDL_SetRenderDrawColor(renderer, barr, barg, barb, 255);  /* draw percent bar. */
123        SDL_RenderFillRect(renderer, &pctrect);
124        SDL_SetRenderDrawColor(renderer, framer, frameg, frameb, 255);  /* draw frame on top of bar. */
125        SDL_RenderRect(renderer, &frame);
126        SDL_SetRenderDrawColor(renderer, textr, textg, textb, 255);
127        SDL_RenderDebugText(renderer, x, y, msgbuf);  /* draw text about battery level */
128    }
129
130    if (msg) {
131        const float x = frame.x + ((frame.w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(msg))) / 2.0f);
132        const float y = frame.y - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * 2);
133        SDL_SetRenderDrawColor(renderer, textr, textg, textb, 255);
134        SDL_RenderDebugText(renderer, x, y, msg);
135    }
136
137    if (msg2) {
138        const float x = frame.x + ((frame.w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(msg2))) / 2.0f);
139        const float y = frame.y - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * 4);
140        SDL_SetRenderDrawColor(renderer, textr, textg, textb, 255);
141        SDL_RenderDebugText(renderer, x, y, msg2);
142    }
143
144    /* put the new rendering on the screen. */
145    SDL_RenderPresent(renderer);
146
147    return SDL_APP_CONTINUE;  /* carry on with the program! */
148}
149
150/* This function runs once at shutdown. */
151void SDL_AppQuit(void *appstate, SDL_AppResult result)
152{
153    /* SDL will clean up the window/renderer for us. */
154}
155
156
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