from_argb() [1/4]

static xtd::drawing::color xtd::drawing::color::from_argb ( uint32  argb )

staticnoexcept

Creates a xtd::drawing::color class from a 32-bit ARGB value.

Parameters

argb	A value specifying the 32-bit ARGB value

Returns

The xtd::drawing::color structure that this method creates.

Remarks

The byte-ordering of the 32-bit ARGB value is AARRGGBB. The most significant byte (MSB), represented by AA, is the alpha component value. The second, third, and fourth bytes, represented by RR, GG, and BB, respectively, are the color components red, green, and blue, respectively.

Examples

The following code example is designed for use with Windows Forms, and it requires xtd::forms::paint_event_args e, which is a parameter of the xtd::forms::control::paint event handler. The code performs the following actions:

• Creates three brushes, each a different color. Each xtd::drawing::color structure that is used to create a brush is created from four component values (alpha, red, green, blue).
• Uses an imaginary triangle to position three circles.
• Paints three overlapping circles, each centered on one vertex of the triangle, using a different brush for each circle.

  void from_argb1(paint_event_args& e) {
    graphics g = e.graphics();
   
    // Transparent red, green, and blue brushes.
    solid_brush trns_red_brush(color::from_argb(0x78FF0000));
    solid_brush trns_green_brush(color::from_argb(0x7800FF00));
    solid_brush trns_blue_brush(color::from_argb(0x780000FF));
   
    // Base and height of the triangle that is used to position the circles. Each vertex of the triangle is at the center of one of the 3 circles. The base is equal to the diameter of the circles.
    float tri_base = 100;
    float tri_height = std::sqrt(3 * (tri_base * tri_base) / 4);
   
    // Coordinates of first circle's bounding rectangle.
    float x1 = 40;
    float y1 = 40;
   
    // Fill 3 over-lapping circles. Each circle is a different color.
    g.fill_ellipse(trns_red_brush, x1, y1, 2 * tri_height, 2 * tri_height);
    g.fill_ellipse(trns_green_brush, x1 + tri_base / 2, y1 + tri_height, 2 * tri_height, 2 * tri_height);
    g.fill_ellipse(trns_blue_brush, x1 + tri_base, y1, 2 * tri_height, 2 * tri_height);
  }

Examples

image_converter.cpp.