🛠️🐜 Antkeeper superbuild with dependencies included
https://antkeeper.com
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272 lines
7.5 KiB
272 lines
7.5 KiB
/*
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Copyright (C) 1997-2022 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 _Object {
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struct _Object *next;
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int x1, y1, x2, y2;
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Uint8 r, g, b;
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SDL_bool isRect;
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} Object;
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static Object *active = NULL;
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static Object *objects = NULL;
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static int buttons = 0;
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static SDL_bool isRect = SDL_FALSE;
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static SDL_bool wheel_x_active = SDL_FALSE;
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static SDL_bool wheel_y_active = SDL_FALSE;
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static float wheel_x = SCREEN_WIDTH * 0.5f;
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static float wheel_y = SCREEN_HEIGHT * 0.5f;
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static SDL_bool done = SDL_FALSE;
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void
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DrawObject(SDL_Renderer * renderer, Object * object)
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{
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SDL_SetRenderDrawColor(renderer, object->r, object->g, object->b, 255);
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if (object->isRect) {
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SDL_Rect rect;
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if (object->x1 > object->x2) {
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rect.x = object->x2;
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rect.w = object->x1 - object->x2;
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} else {
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rect.x = object->x1;
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rect.w = object->x2 - object->x1;
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}
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if (object->y1 > object->y2) {
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rect.y = object->y2;
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rect.h = object->y1 - object->y2;
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} else {
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rect.y = object->y1;
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rect.h = object->y2 - object->y1;
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}
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/* SDL_RenderDrawRect(renderer, &rect); */
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SDL_RenderFillRect(renderer, &rect);
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} else {
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SDL_RenderDrawLine(renderer, object->x1, object->y1, object->x2, object->y2);
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}
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}
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void
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DrawObjects(SDL_Renderer * renderer)
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{
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Object *next = objects;
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while (next != NULL) {
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DrawObject(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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AppendObject(Object *object)
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{
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if (objects) {
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Object *next = objects;
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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 = object;
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} else {
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objects = object;
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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_MOUSEWHEEL:
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if (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED) {
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event.wheel.preciseX *= -1.0f;
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event.wheel.preciseY *= -1.0f;
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event.wheel.x *= -1;
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event.wheel.y *= -1;
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}
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if (event.wheel.preciseX != 0.0f) {
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wheel_x_active = SDL_TRUE;
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/* "positive to the right and negative to the left" */
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wheel_x += event.wheel.preciseX * 10.0f;
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}
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if (event.wheel.preciseY != 0.0f) {
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wheel_y_active = SDL_TRUE;
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/* "positive away from the user and negative towards the user" */
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wheel_y -= event.wheel.preciseY * 10.0f;
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}
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break;
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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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active->isRect = isRect;
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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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case SDL_BUTTON_X1: active->r = 255; active->b = 255; buttons |= SDL_BUTTON_X1MASK; break;
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case SDL_BUTTON_X2: active->g = 255; active->b = 255; buttons |= SDL_BUTTON_X2MASK; 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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case SDL_BUTTON_X1: buttons &= ~SDL_BUTTON_X1MASK; break;
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case SDL_BUTTON_X2: buttons &= ~SDL_BUTTON_X2MASK; break;
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}
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if (buttons == 0) {
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AppendObject(active);
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active = NULL;
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}
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break;
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case SDL_KEYDOWN:
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case SDL_KEYUP:
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switch (event.key.keysym.sym) {
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case SDLK_LSHIFT:
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isRect = (event.key.state == SDL_PRESSED);
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if (active) {
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active->isRect = isRect;
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}
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break;
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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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/* Mouse wheel */
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SDL_SetRenderDrawColor(renderer, 0, 255, 128, 255);
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if (wheel_x_active) {
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SDL_RenderDrawLine(renderer, (int)wheel_x, 0, (int)wheel_x, SCREEN_HEIGHT);
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}
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if (wheel_y_active) {
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SDL_RenderDrawLine(renderer, 0, (int)wheel_y, SCREEN_WIDTH, (int)wheel_y);
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}
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/* Objects from mouse clicks */
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DrawObjects(renderer);
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if (active)
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DrawObject(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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