// Draw triangle on screen
void DrawTriangle(SDL_Surface *screen, triangle_t *triangle)
{
int isOK;
// Scale.
ScaleTriangle(triangle);
// Translate.
TranslateTriangle(triangle);
// Determine bounding box
CalculateTriangleBoundingBox(triangle);
// Sanity check that triangle is within screen boundaries.
isOK = SanityCheckTriangle(screen, triangle);
if (isOK == 0) {
PrintTriangle(triangle, "Triangle outside screen boundaries");
return;
}
// TODO: Insert calls to DrawLine to draw the triangle.
// Remember to use the on-screen coordinates (triangle->sx1, etc.)
DrawLine(screen, triangle->sx1, triangle->sy1, triangle->sx2, triangle->sy2, TRIANGLE_PENCOLOR);
DrawLine(screen, triangle->sx2, triangle->sy2, triangle->sx3, triangle->sy3, TRIANGLE_PENCOLOR);
DrawLine(screen, triangle->sx1, triangle->sy1, triangle->sx3, triangle->sy3, TRIANGLE_PENCOLOR);
// Fill triangle
FillTriangle(screen, triangle);
/*
DrawLine(screen, triangle->bx, triangle->by, triangle->bx + triangle->bw, triangle->by, 0xffffffff);
DrawLine(screen, triangle->bx, triangle->by, triangle->bx, triangle->by + triangle->bh, 0xffffffff);
DrawLine(screen, triangle->bx + triangle->bw, triangle->by + triangle->bh, triangle->bx + triangle->bw, triangle->by, 0xffffffff);
DrawLine(screen, triangle->bx, triangle->bh + triangle->by, triangle->bw + triangle->bx, triangle->by + triangle->bh, 0xffffffff);
*/
// Force screen update.
SDL_UpdateRect(screen, triangle->bx, triangle->by, triangle->bw, triangle->bh);
// Force update of entire screen. Comment/remove this call and uncomment the above call
// when your CalculateTriangleBoundingBox function has been implemented.
// SDL_UpdateRect(screen, 0, 0, screen->w, screen->h);
}
/* *** MAIN *** */
int main(void) {
triangle_t red_triangle;
triangle_t green_triangle;
// declare a pointer to triangle_t
triangle_t *p_triangle;
// assigned the pointer to the green_triangle
p_triangle= &green_triangle;
red_triangle.x1 = 10;
red_triangle.y1 = 30;
red_triangle.scale = 2;
PrintTriangle(&red_triangle);
PrintTriangle(&blue_triangle);
ScaleTriangle(&red_triangle);
ScaleTriangle(&blue_triangle);
// use the pointer to the green_triangle
p_triangle->x1 = 44;
p_triangle->y1 = 22;
PrintTriangle(p_triangle);
return 0;
}