transform()

vec2f fl::TransformFloatImpl::transform

(

const vec2f &

xy

)

const

Definition at line 15 of file transform.cpp.

                                                         {
    if (is_identity()) {
        return xy;
    }
    float x = xy.x;
    float y = xy.y;
    if (scale_x != 1.0f) {
        x *= scale_x;
    }
    if (scale_y != 1.0f) {
        y *= scale_y;
    }
    // Assume that adding floats is fast when offset_x == 0.0f
    x += offset_x;
    y += offset_y;
 
    const bool has_rotation = (rotation != 0.0f);
 
    if (has_rotation) {
        float radians = rotation * 2 * PI;
        float cos_theta = cosf(radians);
        float sin_theta = sinf(radians);
        float x_rotated = x * cos_theta - y * sin_theta;
        float y_rotated = x * sin_theta + y * cos_theta;
        return vec2f(x_rotated, y_rotated);
    }
    return vec2f(x, y);
}

References is_identity(), offset_x, offset_y, PI, rotation, scale_x, scale_y, x, xy(), and y.

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