mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-04 22:48:24 -05:00
194 lines
4.6 KiB
C
Executable File
194 lines
4.6 KiB
C
Executable File
/*
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Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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#include "SDL.h"
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include <stdlib.h> /* exit() */
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#ifdef __IPHONEOS__
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#define SCREEN_WIDTH 320
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#define SCREEN_HEIGHT 480
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#else
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#define SCREEN_WIDTH 640
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#define SCREEN_HEIGHT 480
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#endif
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static SDL_Window *window;
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typedef struct _Line {
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struct _Line *next;
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int x1, y1, x2, y2;
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Uint8 r, g, b;
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} Line;
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static Line *active = NULL;
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static Line *lines = NULL;
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static int buttons = 0;
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static SDL_bool done = SDL_FALSE;
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void
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DrawLine(SDL_Renderer * renderer, Line * line)
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{
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SDL_SetRenderDrawColor(renderer, line->r, line->g, line->b, 255);
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SDL_RenderDrawLine(renderer, line->x1, line->y1, line->x2, line->y2);
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}
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void
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DrawLines(SDL_Renderer * renderer)
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{
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Line *next = lines;
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while (next != NULL) {
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DrawLine(renderer, next);
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next = next->next;
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}
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}
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void
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AppendLine(Line *line)
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{
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if (lines) {
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Line *next = lines;
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while (next->next != NULL) {
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next = next->next;
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}
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next->next = line;
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} else {
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lines = line;
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}
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}
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void
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loop(void *arg)
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{
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SDL_Renderer *renderer = (SDL_Renderer *)arg;
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SDL_Event event;
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/* Check for events */
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while (SDL_PollEvent(&event)) {
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switch (event.type) {
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case SDL_MOUSEMOTION:
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if (!active)
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break;
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active->x2 = event.motion.x;
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active->y2 = event.motion.y;
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break;
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case SDL_MOUSEBUTTONDOWN:
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if (!active) {
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active = SDL_calloc(1, sizeof(*active));
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active->x1 = active->x2 = event.button.x;
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active->y1 = active->y2 = event.button.y;
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}
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switch (event.button.button) {
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case SDL_BUTTON_LEFT: active->r = 255; buttons |= SDL_BUTTON_LMASK; break;
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case SDL_BUTTON_MIDDLE: active->g = 255; buttons |= SDL_BUTTON_MMASK; break;
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case SDL_BUTTON_RIGHT: active->b = 255; buttons |= SDL_BUTTON_RMASK; break;
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}
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break;
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case SDL_MOUSEBUTTONUP:
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if (!active)
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break;
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switch (event.button.button) {
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case SDL_BUTTON_LEFT: buttons &= ~SDL_BUTTON_LMASK; break;
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case SDL_BUTTON_MIDDLE: buttons &= ~SDL_BUTTON_MMASK; break;
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case SDL_BUTTON_RIGHT: buttons &= ~SDL_BUTTON_RMASK; break;
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}
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if (buttons == 0) {
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AppendLine(active);
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active = NULL;
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}
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break;
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case SDL_QUIT:
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done = SDL_TRUE;
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break;
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default:
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break;
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}
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}
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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SDL_RenderClear(renderer);
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DrawLines(renderer);
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if (active)
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DrawLine(renderer, active);
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SDL_RenderPresent(renderer);
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#ifdef __EMSCRIPTEN__
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if (done) {
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emscripten_cancel_main_loop();
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}
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#endif
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}
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int
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main(int argc, char *argv[])
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{
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SDL_Renderer *renderer;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Initialize SDL (Note: video is required to start event loop) */
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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exit(1);
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}
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/* Create a window to display joystick axis position */
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window = SDL_CreateWindow("Mouse Test", SDL_WINDOWPOS_CENTERED,
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SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
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SCREEN_HEIGHT, 0);
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if (window == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError());
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return SDL_FALSE;
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}
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renderer = SDL_CreateRenderer(window, -1, 0);
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if (renderer == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError());
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SDL_DestroyWindow(window);
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return SDL_FALSE;
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}
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/* Main render loop */
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop_arg(loop, renderer, 0, 1);
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#else
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while (!done) {
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loop(renderer);
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}
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#endif
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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