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Provide pi constant, clean up floating point math

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Since M_PI is non-standard, provide own constant to avoid using
-std=gnu++11 or other unwanted hacks.
This commit is contained in:
Dmitry Marakasov 2015-03-27 03:55:52 +03:00
parent 30751aac1a
commit 0d08d4b7bc
1 changed files with 6 additions and 4 deletions
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10
examples/image.cc
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@ -34,6 +34,8 @@
using namespace SDL2pp;
static const float pi = 3.14159265358979323846f;
int main() try {
SDL sdl(SDL_INIT_VIDEO);
SDLImage image(IMG_INIT_PNG); // optional
@ -65,10 +67,10 @@ int main() try {
render.Clear();
// Simple copy
float angle = SDL_GetTicks() / 5000.0 * 2.0 * M_PI;
render.Copy(sprite1, NullOpt, Rect(320 - 64, 240 - 64, 128, 128), angle / M_PI * 180.0);
render.Copy(sprite1, NullOpt, Rect(320 - 32 + sin(angle) * 40, 240 - 32 + cos(angle) * 40, 64, 64));
render.Copy(sprite2, NullOpt, Rect(320 - 32 - sin(angle) * 40, 240 - 32 - cos(angle) * 40, 64, 64));
float angle = SDL_GetTicks() / 5000.0f * 2.0f * pi;
render.Copy(sprite1, NullOpt, Rect(320 - 64, 240 - 64, 128, 128), angle / pi * 180.0f);
render.Copy(sprite1, NullOpt, Rect(320 - 32 + (int)(std::sin(angle) * 40.0f), 240 - 32 + (int)(std::cos(angle) * 40.0f), 64, 64));
render.Copy(sprite2, NullOpt, Rect(320 - 32 - (int)(std::sin(angle) * 40.0f), 240 - 32 - (int)(std::cos(angle) * 40.0f), 64, 64));
render.Present();