Module: RedBird::Render

Defined in:
ext/red_bird/render.c,
ext/red_bird/render.c

Overview

This module contains basic rendering functionalities.

Author:

  • Frederico Linhares

Class Method Summary collapse

Class Method Details

.clear_screen ⇒ RedBird::Render

Fill the entire screen with a single color defined by RedBird::Render.set_color.

Returns:

See Also:

Author:

  • Frederico Linhares



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# File 'ext/red_bird/render.c', line 86

VALUE
bird_mRender_clear_screen(VALUE self)
{
  SDL_RenderClear(bird_core.renderer);

  return self;
}

.fill_rect(x, y, width, height) ⇒ RedBird::Render

Draw a rectangle filled with a color defined by RedBird::Render.set_color.

Parameters:

  • x (Integer)
  • y (Integer)
  • width (Integer)
  • height (Integer)

Returns:

See Also:

Author:

  • Frederico Linhares



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# File 'ext/red_bird/render.c', line 58

VALUE
bird_mRender_fill_rect(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
  SDL_Rect rect;

  RB_INTEGER_TYPE_P(x);
  RB_INTEGER_TYPE_P(y);
  RB_INTEGER_TYPE_P(width);
  RB_INTEGER_TYPE_P(height);

  rect.x = x;
  rect.y = y;
  rect.w = width;
  rect.h = height;

  SDL_RenderFillRect(bird_core.renderer, &rect);

  return self;
}

.set_color(color) ⇒ RedBird::Render

Use this method to define the color that will be used by some drawing methods.

Parameters:

Returns:

Author:

  • Frederico Linhares



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# File 'ext/red_bird/render.c', line 25

VALUE
bird_mRender_set_color(VALUE self, VALUE color)
{
  struct bird_color_data *color_ptr;

  if(!rb_obj_is_kind_of(color, bird_cColor))
  {
    rb_raise(rb_eTypeError, "%s",
             "color must be an instance of RedBird::Color");

    return self;
  }

  color_ptr = bird_cColor_get_data(color);

  SDL_SetRenderDrawColor(
      bird_core.renderer, color_ptr->data.r, color_ptr->data.g,
      color_ptr->data.b, color_ptr->data.a);

  return self;
}

.update_screen ⇒ RedBird::Render

Every time you draw anything, this drawing is not applied directly to the screen; instead, the command draws to a buffer. This procedure allows you to do all the drawing before you present it to the user. After you finish all updates you want into the buffer, you must call this method to send the final buffer to the screen.

Returns:

Author:

  • Frederico Linhares



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# File 'ext/red_bird/render.c', line 104

VALUE
bird_mRender_update_screen(VALUE self)
{
  SDL_SetRenderTarget(bird_core.renderer, NULL);

  SDL_RenderCopy(bird_core.renderer, bird_core.pre_screen_buffer, NULL,
                 &bird_core.screen_rect);
  SDL_RenderPresent(bird_core.renderer);

  SDL_SetRenderTarget(bird_core.renderer, bird_core.pre_screen_buffer);

  return self;
}