#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "SDL_test_common.h"

Include dependency graph for testintersections.c:

Macros
#define	SWAP(typ, a, b) do{typ t=a;a=b;b=t;}while(0)
#define	NUM_OBJECTS 100
#define	MAX_LINES 16
#define	MAX_RECTS 16

Functions
void	DrawPoints (SDL_Renderer *renderer)
static int	add_line (int x1, int y1, int x2, int y2)
void	DrawLines (SDL_Renderer *renderer)
static int	add_rect (int x1, int y1, int x2, int y2)
static void	DrawRects (SDL_Renderer *renderer)
static void	DrawRectLineIntersections (SDL_Renderer *renderer)
static void	DrawRectRectIntersections (SDL_Renderer *renderer)
void	loop ()
int	main (int argc, char *argv[])

Variables
static SDLTest_CommonState *	state
static int	num_objects
static SDL_bool	cycle_color
static SDL_bool	cycle_alpha
static int	cycle_direction = 1
static int	current_alpha = 255
static int	current_color = 255
static SDL_BlendMode	blendMode = SDL_BLENDMODE_NONE
int	mouse_begin_x = -1
int	mouse_begin_y = -1
int	done
int	num_lines = 0
SDL_Rect	lines [MAX_LINES]
int	num_rects = 0
SDL_Rect	rects [MAX_RECTS]

Macro Definition Documentation

#define MAX_LINES 16

Definition at line 83 of file testintersections.c.

Referenced by add_line().

#define MAX_RECTS 16

Definition at line 127 of file testintersections.c.

Referenced by add_rect().

#define NUM_OBJECTS 100

Definition at line 26 of file testintersections.c.

Referenced by main().

#define SWAP	(	typ,
		a,
		b
	)	do{typ t=a;a=b;b=t;}while(0)

Definition at line 25 of file testintersections.c.

Referenced by add_rect().

Function Documentation

static int add_line	(	int	x1,
		int	y1,
		int	x2,
		int	y2
	)

static

Definition at line 87 of file testintersections.c.

References SDL_Rect::h, MAX_LINES, num_lines, SDL_Log, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by loop().

{
    if (num_lines >= MAX_LINES)
        return 0;
    if ((x1 == x2) && (y1 == y2))
        return 0;
    SDL_Log("adding line (%d, %d), (%d, %d)\n", x1, y1, x2, y2);
    lines[num_lines].x = x1;
    lines[num_lines].y = y1;
    lines[num_lines].w = x2;
    lines[num_lines].h = y2;
    return ++num_lines;
}

static int add_rect	(	int	x1,
		int	y1,
		int	x2,
		int	y2
	)

static

Definition at line 131 of file testintersections.c.

References SDL_Rect::h, MAX_RECTS, num_rects, SDL_Log, SWAP, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by loop().

{
    if (num_rects >= MAX_RECTS)
        return 0;
    if ((x1 == x2) || (y1 == y2))
        return 0;
    if (x1 > x2)
        SWAP(int, x1, x2);
    if (y1 > y2)
        SWAP(int, y1, y2);
    SDL_Log("adding rect (%d, %d), (%d, %d) [%dx%d]\n", x1, y1, x2, y2,
           x2 - x1, y2 - y1);
    rects[num_rects].x = x1;
    rects[num_rects].y = y1;
    rects[num_rects].w = x2 - x1;
    rects[num_rects].h = y2 - y1;
    return ++num_rects;
}

void DrawLines ( SDL_Renderer * renderer )

Definition at line 105 of file testintersections.c.

References SDL_Rect::h, i, num_lines, SDL_RenderDrawLine, SDL_RenderGetViewport, SDL_SetRenderDrawColor, viewport, and SDL_Rect::w.

{
    int i;
    SDL_Rect viewport;
    /* Query the sizes */
    SDL_RenderGetViewport(renderer, &viewport);
    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
    for (i = 0; i < num_lines; ++i) {
        if (i == -1) {
            SDL_RenderDrawLine(renderer, 0, 0, viewport.w - 1, viewport.h - 1);
            SDL_RenderDrawLine(renderer, 0, viewport.h - 1, viewport.w - 1, 0);
            SDL_RenderDrawLine(renderer, 0, viewport.h / 2, viewport.w - 1, viewport.h / 2);
            SDL_RenderDrawLine(renderer, viewport.w / 2, 0, viewport.w / 2, viewport.h - 1);
        } else {
            SDL_RenderDrawLine(renderer, lines[i].x, lines[i].y, lines[i].w, lines[i].h);
        }
    }
}

void DrawPoints ( SDL_Renderer * renderer )

Definition at line 41 of file testintersections.c.

References current_alpha, current_color, cycle_alpha, cycle_color, cycle_direction, SDL_Rect::h, i, num_objects, SDL_RenderDrawPoint, SDL_RenderGetViewport, SDL_SetRenderDrawColor, viewport, and SDL_Rect::w.

{
    int i;
    int x, y;
    SDL_Rect viewport;
    /* Query the sizes */
    SDL_RenderGetViewport(renderer, &viewport);
    for (i = 0; i < num_objects * 4; ++i) {
        /* Cycle the color and alpha, if desired */
        if (cycle_color) {
            current_color += cycle_direction;
            if (current_color < 0) {
                current_color = 0;
                cycle_direction = -cycle_direction;
            }
            if (current_color > 255) {
                current_color = 255;
                cycle_direction = -cycle_direction;
            }
        }
        if (cycle_alpha) {
            current_alpha += cycle_direction;
            if (current_alpha < 0) {
                current_alpha = 0;
                cycle_direction = -cycle_direction;
            }
            if (current_alpha > 255) {
                current_alpha = 255;
                cycle_direction = -cycle_direction;
            }
        }
        SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
                               (Uint8) current_color, (Uint8) current_alpha);
        x = rand() % viewport.w;
        y = rand() % viewport.h;
        SDL_RenderDrawPoint(renderer, x, y);
    }
}

static void DrawRectLineIntersections ( SDL_Renderer * renderer )

static

Definition at line 162 of file testintersections.c.

References SDL_Rect::h, i, j, num_lines, num_rects, SDL_IntersectRectAndLine, SDL_RenderDrawLine, SDL_SetRenderDrawColor, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by loop().

{
    int i, j;
    SDL_SetRenderDrawColor(renderer, 0, 255, 55, 255);
    for (i = 0; i < num_rects; i++)
        for (j = 0; j < num_lines; j++) {
            int x1, y1, x2, y2;
            SDL_Rect r;
            r = rects[i];
            x1 = lines[j].x;
            y1 = lines[j].y;
            x2 = lines[j].w;
            y2 = lines[j].h;
            if (SDL_IntersectRectAndLine(&r, &x1, &y1, &x2, &y2)) {
                SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
            }
        }
}

static void DrawRectRectIntersections ( SDL_Renderer * renderer )

static

Definition at line 186 of file testintersections.c.

References i, j, num_rects, SDL_IntersectRect, SDL_RenderFillRect, and SDL_SetRenderDrawColor.

Referenced by loop().

{
    int i, j;
    SDL_SetRenderDrawColor(renderer, 255, 200, 0, 255);
    for (i = 0; i < num_rects; i++)
        for (j = i + 1; j < num_rects; j++) {
            SDL_Rect r;
            if (SDL_IntersectRect(&rects[i], &rects[j], &r)) {
                SDL_RenderFillRect(renderer, &r);
            }
        }
}

static void DrawRects ( SDL_Renderer * renderer )

static

Definition at line 155 of file testintersections.c.

References num_rects, SDL_RenderFillRects, and SDL_SetRenderDrawColor.

{
    SDL_SetRenderDrawColor(renderer, 255, 127, 0, 255);
    SDL_RenderFillRects(renderer, rects, num_rects);
}

void loop ( )

Definition at line 202 of file testintersections.c.

References add_line(), add_rect(), SDL_MouseButtonEvent::button, SDL_Event::button, done, DrawLines(), DrawPoints(), DrawRectLineIntersections(), DrawRectRectIntersections(), DrawRects(), i, SDL_Event::key, SDL_KeyboardEvent::keysym, KMOD_SHIFT, SDL_Keysym::mod, mouse_begin_x, mouse_begin_y, NULL, num_lines, num_rects, SDLTest_CommonState::num_windows, renderer, SDLTest_CommonState::renderers, SDL_KEYDOWN, SDL_MOUSEBUTTONDOWN, SDL_MOUSEBUTTONUP, SDL_PollEvent, SDL_RenderClear, SDL_RenderPresent, SDL_SetRenderDrawColor, SDLTest_CommonEvent(), SDL_Keysym::sym, SDL_Event::type, SDLTest_CommonState::windows, SDL_MouseButtonEvent::x, and SDL_MouseButtonEvent::y.

{
    int i;
    SDL_Event event;
    /* Check for events */
    while (SDL_PollEvent(&event)) {
        SDLTest_CommonEvent(state, &event, &done);
        switch (event.type) {
        case SDL_MOUSEBUTTONDOWN:
            mouse_begin_x = event.button.x;
            mouse_begin_y = event.button.y;
            break;
        case SDL_MOUSEBUTTONUP:
            if (event.button.button == 3)
                add_line(mouse_begin_x, mouse_begin_y, event.button.x,
                         event.button.y);
            if (event.button.button == 1)
                add_rect(mouse_begin_x, mouse_begin_y, event.button.x,
                         event.button.y);
            break;
        case SDL_KEYDOWN:
            switch (event.key.keysym.sym) {
            case 'l':
                if (event.key.keysym.mod & KMOD_SHIFT)
                    num_lines = 0;
                else
                    add_line(rand() % 640, rand() % 480, rand() % 640,
                             rand() % 480);
                break;
            case 'r':
                if (event.key.keysym.mod & KMOD_SHIFT)
                    num_rects = 0;
                else
                    add_rect(rand() % 640, rand() % 480, rand() % 640,
                             rand() % 480);
                break;
            }
            break;
        default:
            break;
        }
    }
    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        if (state->windows[i] == NULL)
            continue;
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
        SDL_RenderClear(renderer);
        DrawRects(renderer);
        DrawPoints(renderer);
        DrawRectRectIntersections(renderer);
        DrawLines(renderer);
        DrawRectLineIntersections(renderer);
        SDL_RenderPresent(renderer);
    }
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 268 of file testintersections.c.

References blendMode, cycle_alpha, cycle_color, done, i, loop(), NULL, NUM_OBJECTS, num_objects, SDLTest_CommonState::num_windows, renderer, SDLTest_CommonState::renderers, SDL_atoi, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_GetTicks(), SDL_INIT_VIDEO, SDL_isdigit, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogSetPriority, SDL_RenderClear, SDL_SetRenderDrawBlendMode, SDL_SetRenderDrawColor, SDL_strcasecmp, SDL_TRUE, SDLTest_CommonArg(), SDLTest_CommonCreateState(), SDLTest_CommonInit(), SDLTest_CommonQuit(), and SDLTest_CommonUsage().

{
    int i;
    Uint32 then, now, frames;
    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    /* Initialize parameters */
    num_objects = NUM_OBJECTS;
    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    if (!state) {
        return 1;
    }
    for (i = 1; i < argc;) {
        int consumed;
        consumed = SDLTest_CommonArg(state, i);
        if (consumed == 0) {
            consumed = -1;
            if (SDL_strcasecmp(argv[i], "--blend") == 0) {
                if (argv[i + 1]) {
                    if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
                        blendMode = SDL_BLENDMODE_NONE;
                        consumed = 2;
                    } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
                        blendMode = SDL_BLENDMODE_BLEND;
                        consumed = 2;
                    } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
                        blendMode = SDL_BLENDMODE_ADD;
                        consumed = 2;
                    } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
                        blendMode = SDL_BLENDMODE_MOD;
                        consumed = 2;
                    }
                }
            } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
                cycle_color = SDL_TRUE;
                consumed = 1;
            } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
                cycle_alpha = SDL_TRUE;
                consumed = 1;
            } else if (SDL_isdigit(*argv[i])) {
                num_objects = SDL_atoi(argv[i]);
                consumed = 1;
            }
        }
        if (consumed < 0) {
            SDL_Log("Usage: %s %s [--blend none|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
                    argv[0], SDLTest_CommonUsage(state));
            return 1;
        }
        i += consumed;
    }
    if (!SDLTest_CommonInit(state)) {
        return 2;
    }
    /* Create the windows and initialize the renderers */
    for (i = 0; i < state->num_windows; ++i) {
        SDL_Renderer *renderer = state->renderers[i];
        SDL_SetRenderDrawBlendMode(renderer, blendMode);
        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
        SDL_RenderClear(renderer);
    }
    srand(time(NULL));
    /* Main render loop */
    frames = 0;
    then = SDL_GetTicks();
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        ++frames;
        loop();
    }
#endif
    SDLTest_CommonQuit(state);
    /* Print out some timing information */
    now = SDL_GetTicks();
    if (now > then) {
        double fps = ((double) frames * 1000) / (now - then);
        SDL_Log("%2.2f frames per second\n", fps);
    }
    return 0;
}

Variable Documentation

SDL_BlendMode blendMode = SDL_BLENDMODE_NONE

static

Definition at line 35 of file testintersections.c.

Referenced by main().

int current_alpha = 255

static

Definition at line 33 of file testintersections.c.

Referenced by DrawPoints().

int current_color = 255

static

Definition at line 34 of file testintersections.c.

Referenced by DrawPoints().

SDL_bool cycle_alpha

static

Definition at line 31 of file testintersections.c.

Referenced by DrawPoints(), and main().

SDL_bool cycle_color

static

Definition at line 30 of file testintersections.c.

Referenced by DrawPoints(), and main().

int cycle_direction = 1

static

Definition at line 32 of file testintersections.c.

Referenced by DrawPoints().

int done

Definition at line 38 of file testintersections.c.

SDL_Rect lines[MAX_LINES]

Definition at line 85 of file testintersections.c.

int mouse_begin_x = -1

Definition at line 37 of file testintersections.c.

Referenced by loop().

int mouse_begin_y = -1

Definition at line 37 of file testintersections.c.

Referenced by loop().

int num_lines = 0

Definition at line 84 of file testintersections.c.

Referenced by add_line(), DrawLines(), DrawRectLineIntersections(), and loop().

int num_objects

static

Definition at line 29 of file testintersections.c.

Referenced by DrawPoints(), and main().

int num_rects = 0

Definition at line 128 of file testintersections.c.

Referenced by add_rect(), DrawRectLineIntersections(), DrawRectRectIntersections(), DrawRects(), and loop().

SDL_Rect rects[MAX_RECTS]

Definition at line 129 of file testintersections.c.

SDLTest_CommonState* state

static

Definition at line 28 of file testintersections.c.

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation