forked from Green-Sky/tomato
315 lines
8.2 KiB
C
315 lines
8.2 KiB
C
/*
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Copyright (C) 1997-2024 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 <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include <SDL3/SDL_test.h>
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#ifdef SDL_PLATFORM_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 SDL_PLATFORM_IOS
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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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{
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struct _Object *next;
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float 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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struct mouse_loop_data {
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SDL_bool done;
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SDL_Renderer *renderer;
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};
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static void 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_FRect 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_RenderFillRect(renderer, &rect);
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} else {
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SDL_RenderLine(renderer, object->x1, object->y1, object->x2, object->y2);
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}
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}
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static void DrawObjects(SDL_Renderer *renderer)
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{
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Object *next = objects;
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while (next) {
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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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static void 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) {
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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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static void loop(void *arg)
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{
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struct mouse_loop_data *loop_data = (struct mouse_loop_data *)arg;
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SDL_Event event;
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SDL_Renderer *renderer = loop_data->renderer;
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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_EVENT_MOUSE_WHEEL:
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if (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED) {
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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.x != 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.x * 10.0f;
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}
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if (event.wheel.y != 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.y * 10.0f;
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}
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break;
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case SDL_EVENT_MOUSE_MOTION:
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if (!active) {
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break;
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}
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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_EVENT_MOUSE_BUTTON_DOWN:
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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:
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active->r = 255;
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buttons |= SDL_BUTTON_LMASK;
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break;
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case SDL_BUTTON_MIDDLE:
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active->g = 255;
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buttons |= SDL_BUTTON_MMASK;
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break;
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case SDL_BUTTON_RIGHT:
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active->b = 255;
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buttons |= SDL_BUTTON_RMASK;
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break;
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case SDL_BUTTON_X1:
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active->r = 255;
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active->b = 255;
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buttons |= SDL_BUTTON_X1MASK;
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break;
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case SDL_BUTTON_X2:
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active->g = 255;
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active->b = 255;
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buttons |= SDL_BUTTON_X2MASK;
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break;
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}
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break;
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case SDL_EVENT_MOUSE_BUTTON_UP:
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if (!active) {
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break;
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}
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switch (event.button.button) {
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case SDL_BUTTON_LEFT:
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buttons &= ~SDL_BUTTON_LMASK;
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break;
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case SDL_BUTTON_MIDDLE:
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buttons &= ~SDL_BUTTON_MMASK;
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break;
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case SDL_BUTTON_RIGHT:
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buttons &= ~SDL_BUTTON_RMASK;
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break;
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case SDL_BUTTON_X1:
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buttons &= ~SDL_BUTTON_X1MASK;
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break;
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case SDL_BUTTON_X2:
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buttons &= ~SDL_BUTTON_X2MASK;
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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_EVENT_KEY_DOWN:
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case SDL_EVENT_KEY_UP:
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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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default:
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break;
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}
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break;
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case SDL_EVENT_QUIT:
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loop_data->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_RenderLine(renderer, wheel_x, 0.0f, wheel_x, (float)SCREEN_HEIGHT);
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}
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if (wheel_y_active) {
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SDL_RenderLine(renderer, 0.0f, wheel_y, (float)SCREEN_WIDTH, 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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}
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SDL_RenderPresent(renderer);
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#ifdef SDL_PLATFORM_EMSCRIPTEN
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if (loop_data->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 main(int argc, char *argv[])
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{
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struct mouse_loop_data loop_data;
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SDLTest_CommonState *state;
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, 0);
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if (!state) {
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return 1;
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}
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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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/* Parse commandline */
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if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
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return 1;
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}
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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", SCREEN_WIDTH, SCREEN_HEIGHT, 0);
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if (!window) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create window: %s\n", SDL_GetError());
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return 0;
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}
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loop_data.done = SDL_FALSE;
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loop_data.renderer = SDL_CreateRenderer(window, NULL, 0);
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if (!loop_data.renderer) {
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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 0;
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}
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/* Main render loop */
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#ifdef SDL_PLATFORM_EMSCRIPTEN
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emscripten_set_main_loop_arg(loop, &loop_data, 0, 1);
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#else
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while (loop_data.done == SDL_FALSE) {
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loop(&loop_data);
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}
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#endif
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SDL_DestroyRenderer(loop_data.renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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SDLTest_CommonDestroyState(state);
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return 0;
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}
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