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testlines2.c
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/* Simple program: draw as many random lines on the screen as possible */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "common.h"
#define NUM_LINES 100
static CommonState *state;
static int num_lines;
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;
void
DrawLines(SDL_WindowID window)
{
int i, n;
int x1, y1, x2, y2;
int window_w, window_h;
SDL_SelectRenderer(window);
/* Query the sizes */
SDL_GetWindowSize(window, &window_w, &window_h);
/* Move the sprite, bounce at the wall, and draw */
n = 0;
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderFill(NULL);
SDL_SetRenderDrawBlendMode(blendMode);
for (i = 0; i < num_lines; ++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(255, (Uint8) current_color,
(Uint8) current_color, (Uint8) current_alpha);
x1 = rand() % window_w;
x2 = rand() % window_w;
y1 = rand() % window_h;
y2 = rand() % window_h;
SDL_RenderLine(x1, y1, x2, y2);
}
SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
/* Update the screen! */
SDL_RenderPresent();
}
int
main(int argc, char *argv[])
{
int i, done;
SDL_Event event;
Uint32 then, now, frames;
/* Initialize parameters */
num_lines = NUM_LINES;
/* Initialize test framework */
state = CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
for (i = 1; i < argc;) {
int consumed;
consumed = 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], "mask") == 0) {
blendMode = SDL_BLENDMODE_MASK;
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_lines = SDL_atoi(argv[i]);
consumed = 1;
}
}
if (consumed < 0) {
fprintf(stderr,
"Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
argv[0], CommonUsage(state));
return 1;
}
i += consumed;
}
if (!CommonInit(state)) {
return 2;
}
/* Create the windows and initialize the renderers */
for (i = 0; i < state->num_windows; ++i) {
SDL_SelectRenderer(state->windows[i]);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderFill(NULL);
}
srand(time(NULL));
/* Main render loop */
frames = 0;
then = SDL_GetTicks();
done = 0;
while (!done) {
/* Check for events */
++frames;
while (SDL_PollEvent(&event)) {
CommonEvent(state, &event, &done);
switch (event.type) {
case SDL_WINDOWEVENT:
switch (event.window.event) {
case SDL_WINDOWEVENT_EXPOSED:
SDL_SelectRenderer(event.window.windowID);
SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
SDL_RenderFill(NULL);
break;
}
break;
default:
break;
}
}
for (i = 0; i < state->num_windows; ++i) {
DrawLines(state->windows[i]);
}
}
/* Print out some timing information */
now = SDL_GetTicks();
if (now > then) {
double fps = ((double) frames * 1000) / (now - then);
printf("%2.2f frames per second\n", fps);
}
return 0;
}
/* vi: set ts=4 sw=4 expandtab: */