pineapple-src/externals/SDL/test/testmouse.c

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2021-12-07 01:20:09 +00:00
/*
Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
#include "SDL.h"
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#endif
#include <stdlib.h> /* exit() */
#ifdef __IPHONEOS__
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 480
#else
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#endif
static SDL_Window *window;
typedef struct _Line {
struct _Line *next;
int x1, y1, x2, y2;
Uint8 r, g, b;
} Line;
static Line *active = NULL;
static Line *lines = NULL;
static int buttons = 0;
static SDL_bool done = SDL_FALSE;
void
DrawLine(SDL_Renderer * renderer, Line * line)
{
SDL_SetRenderDrawColor(renderer, line->r, line->g, line->b, 255);
SDL_RenderDrawLine(renderer, line->x1, line->y1, line->x2, line->y2);
}
void
DrawLines(SDL_Renderer * renderer)
{
Line *next = lines;
while (next != NULL) {
DrawLine(renderer, next);
next = next->next;
}
}
void
AppendLine(Line *line)
{
if (lines) {
Line *next = lines;
while (next->next != NULL) {
next = next->next;
}
next->next = line;
} else {
lines = line;
}
}
void
loop(void *arg)
{
SDL_Renderer *renderer = (SDL_Renderer *)arg;
SDL_Event event;
/* Check for events */
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_MOUSEMOTION:
if (!active)
break;
active->x2 = event.motion.x;
active->y2 = event.motion.y;
break;
case SDL_MOUSEBUTTONDOWN:
if (!active) {
active = SDL_calloc(1, sizeof(*active));
active->x1 = active->x2 = event.button.x;
active->y1 = active->y2 = event.button.y;
}
switch (event.button.button) {
case SDL_BUTTON_LEFT: active->r = 255; buttons |= SDL_BUTTON_LMASK; break;
case SDL_BUTTON_MIDDLE: active->g = 255; buttons |= SDL_BUTTON_MMASK; break;
case SDL_BUTTON_RIGHT: active->b = 255; buttons |= SDL_BUTTON_RMASK; break;
}
break;
case SDL_MOUSEBUTTONUP:
if (!active)
break;
switch (event.button.button) {
case SDL_BUTTON_LEFT: buttons &= ~SDL_BUTTON_LMASK; break;
case SDL_BUTTON_MIDDLE: buttons &= ~SDL_BUTTON_MMASK; break;
case SDL_BUTTON_RIGHT: buttons &= ~SDL_BUTTON_RMASK; break;
}
if (buttons == 0) {
AppendLine(active);
active = NULL;
}
break;
case SDL_QUIT:
done = SDL_TRUE;
break;
default:
break;
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
DrawLines(renderer);
if (active)
DrawLine(renderer, active);
SDL_RenderPresent(renderer);
#ifdef __EMSCRIPTEN__
if (done) {
emscripten_cancel_main_loop();
}
#endif
}
int
main(int argc, char *argv[])
{
SDL_Renderer *renderer;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Initialize SDL (Note: video is required to start event loop) */
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
exit(1);
}
/* Create a window to display joystick axis position */
window = SDL_CreateWindow("Mouse Test", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
SCREEN_HEIGHT, 0);
if (window == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError());
return SDL_FALSE;
}
renderer = SDL_CreateRenderer(window, -1, 0);
if (renderer == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create renderer: %s\n", SDL_GetError());
SDL_DestroyWindow(window);
return SDL_FALSE;
}
/* Main render loop */
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop_arg(loop, renderer, 0, 1);
#else
while (!done) {
loop(renderer);
}
#endif
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */