C++ int2类代码示例

	void UIScrollBar::MouseOverHandler(UIDialog const & /*sender*/, uint32_t /*buttons*/, int2 const & pt)
	{
		last_mouse_ = pt;
		is_mouse_over_ = true;

		if (drag_)
		{
			thumb_rc_.bottom() += pt.y() - thumb_offset_y_ - thumb_rc_.top();
			thumb_rc_.top() = pt.y() - thumb_offset_y_;
			if (thumb_rc_.top() < track_rc_.top())
			{
				thumb_rc_ += int2(0, track_rc_.top() - thumb_rc_.top());
			}
			else
			{
				if (thumb_rc_.bottom() > track_rc_.bottom())
				{
					thumb_rc_ += int2(0, track_rc_.bottom() - thumb_rc_.bottom());
				}
			}

			// Compute first item index based on thumb position

			size_t nMaxFirstItem = end_ - start_ - page_size_;  // Largest possible index for first item
			size_t nMaxThumb = track_rc_.Height() - thumb_rc_.Height();  // Largest possible thumb position from the top

			position_ = start_ +
				(thumb_rc_.top() - track_rc_.top() +
				nMaxThumb / (nMaxFirstItem * 2)) * // Shift by half a row to avoid last row covered by only one pixel
				nMaxFirstItem  / nMaxThumb;
		}
	}

void IGLUShaderVariable::operator= ( int2 val )
{
	// Check for a valid shader index
	if ( m_varIdx < 0 ) return;

	// Check for type mismatches
	if ( m_isAttribute )
	{
		AssignmentToAttribute( "ivec2" );
		return;
	}
	if ( m_varType != GL_INT_VEC2 && m_varType != GL_UNSIGNED_INT_VEC2 )
		TypeMismatch( "ivec2" );

	// Ensure this program is currently bound, or setting shader values fails!
	m_parent->PushProgram();

	// For types of variable that can be assigned from our input value, assign them here
	if ( m_varType == GL_INT_VEC2 )
		glUniform2iv( m_varIdx, 1, val.GetConstDataPtr() ); 
	if ( m_varType == GL_UNSIGNED_INT_VEC2 )
		glUniform2ui( m_varIdx, val.X(), val.Y() );

	// We have a short "program stack" so make sure to pop off.
	m_parent->PopProgram();
}	

	void UIPolylineEditBox::MouseUpHandler(UIDialog const & /*sender*/, uint32_t buttons, int2 const & pt)
	{
		if (buttons & MB_Left)
		{
			if (!this->GetDialog()->IsKeyboardInputEnabled())
			{
				this->GetDialog()->ClearFocus();
			}

			if (this->ContainsPoint(pt))
			{
				if (move_point_)
				{
					if ((this->ActivePoint() != 0) && (this->ActivePoint() != static_cast<int>(this->NumCtrlPoints() - 1)))
					{
						float2 p = this->PtFromCoord(pt.x(), pt.y());
						if ((p.x() < 0) || (p.x() > 1) || (p.y() < 0) || (p.y() > 1))
						{
							this->DelCtrlPoint(this->ActivePoint());
						}
					}

					move_point_ = false;
				}
			}
		}
	}

void Set2DMode(const int2 &screensize)
{
    glDisable(GL_CULL_FACE);  
    glDisable(GL_DEPTH_TEST);

    otransforms = objecttransforms();

    view2clip = orthoGL(0, (float)screensize.x(), (float)screensize.y(), 0, 1, -1); // left handed coordinate system
}

void OpenGLFrameStart(const int2 &screensize)
{
    glViewport(0, 0, screensize.x(), screensize.y());

    SetBlendMode(BLEND_ALPHA);

    curcolor = float4(1);

    lights.clear();
}

	void UISlider::MouseDownHandler(UIDialog const & /*sender*/, uint32_t buttons, int2 const & pt)
	{
		if (buttons & MB_Left)
		{
			if (button_rc_.PtInRect(pt))
			{
				// Pressed while inside the control
				pressed_ = true;

				drag_x_ = pt.x();
				//m_nDragY = arg.location.y();
				drag_offset_ = button_x_ - drag_x_;

				//m_nDragValue = value_;

				if (!has_focus_)
				{
					this->GetDialog()->RequestFocus(*this);
				}

				return;
			}

			if (slider_rc_.PtInRect(pt))
			{
				drag_x_ = pt.x();
				drag_offset_ = 0;
				pressed_ = true;

				if (!has_focus_)
				{
					this->GetDialog()->RequestFocus(*this);
				}

				if (pt.x() > button_x_ + x_)
				{
					this->SetValueInternal(value_ + 1);
					return;
				}

				if (pt.x() < button_x_ + x_)
				{
					this->SetValueInternal(value_ - 1);
					return;
				}
			}
		}
	}

	void UISlider::MouseOverHandler(UIDialog const & /*sender*/, uint32_t /*buttons*/, int2 const & pt)
	{
		if (pressed_)
		{
			this->SetValueInternal(ValueFromPos(x_ + pt.x() + drag_offset_));
		}
	}

//---------------------------------------------------------------------------------------------------------
BlockGenerator::BlockGenerator( const int2& size, int blockSize ) : mSize(size), mBockSize(blockSize)
{
	mNumBlocks = int2(
		(int)std::ceil(size.X() / (float) blockSize),
		(int)std::ceil(size.Y() / (float) blockSize));

	mBlocksLeft = mNumBlocks.X() * mNumBlocks.Y();

	mDirection = Right;

	mBlock = mNumBlocks / 2;

	mStepsLeft = 1;
	mNumSteps = 1;

	mStartTime = clock();
}

	void UIScrollBar::MouseDownHandler(UIDialog const & /*sender*/, uint32_t buttons, int2 const & pt)
	{
		last_mouse_ = pt;
		if (buttons & MB_Left)
		{
			if (up_button_rc_.PtInRect(pt))
			{
				if (position_ > start_)
				{
					-- position_;
				}
				this->UpdateThumbRect();
				arrow_ = CLICKED_UP;
				arrow_ts_ = timer_.current_time();
				return;
			}

			// Check for click on down button

			if (down_button_rc_.PtInRect(pt))
			{
				if (position_ + page_size_ < end_)
				{
					++ position_;
				}
				this->UpdateThumbRect();
				arrow_ = CLICKED_DOWN;
				arrow_ts_ = timer_.current_time();
				return;
			}

			// Check for click on thumb

			if (thumb_rc_.PtInRect(pt))
			{
				drag_ = true;
				thumb_offset_y_ = pt.y() - thumb_rc_.top();
				return;
			}

			// Check for click on track

			if ((thumb_rc_.left() <= pt.x()) && (thumb_rc_.right() > pt.x()))
			{
				if ((thumb_rc_.top() > pt.y()) && (track_rc_.top() <= pt.y()))
				{
					this->Scroll(-static_cast<int>(page_size_ - 1));
				}
				else
				{
					if ((thumb_rc_.bottom() <= pt.y()) && (track_rc_.bottom() > pt.y()))
					{
						this->Scroll(static_cast<int>(page_size_ - 1));
					}
				}
			}
		}
	}

bool ListBox::OnMouseButtonRelease( const int2& screenPos, uint32_t button )
{
	bool eventConsumed = false;

	if (button == MS_LeftButton)
	{
		if (mPressed)
		{
			if (mSelectionRegion.Contains((float)screenPos.X(), (float)screenPos.Y()))
			{
				int32_t selIndex = mVertScrollBar->GetScrollValue() + (int32_t)floorf((screenPos.Y() - mSelectionRegion.Top()) / mTextRowHeight);
				SetSelectedIndex(selIndex, true);			
			}	

			mPressed = false;
			eventConsumed = true;
		}
	}

	return eventConsumed;
}

	void Blur::GaussBlur(
		const Ptr<ShaderResourceView> & src,
		const Ptr<RenderTargetView> & dst,
		int2 numSamples,
		float2 blurRadius)
	{
		auto dstTex = dst->GetResource()->Cast<Texture>();
		auto mipSize = dstTex->GetMipSize(dst->Cast<TextureRenderTargetView>()->mipLevel);

		TextureDesc texDesc = dst->GetResource()->Cast<Texture>()->GetDesc();
		texDesc.width = mipSize.x();
		texDesc.height = mipSize.y();
		texDesc.depth = 1;
		texDesc.arraySize = 1;
		texDesc.mipLevels = 1;
		auto tmpTex = TexturePool::Instance().FindFree({ TEXTURE_2D, texDesc });

		GaussBlurX(src, tmpTex->Get()->Cast<Texture>()->GetRenderTargetView(0, 0, 1), numSamples.x(), blurRadius.x());

		GaussBlurY(tmpTex->Get()->Cast<Texture>()->GetShaderResourceView(0, 1, 0, 1), dst, numSamples.y(), blurRadius.y());
	}

float AADist(std::vector<float> const & img, std::vector<float2> const & grad,
	int width, int offset_addr, int2 const & offset_dist_xy, float2 const & new_dist)
{
	int closest = offset_addr - offset_dist_xy.y() * width - offset_dist_xy.x(); // Index to the edge pixel pointed to from c
	float val = img[closest];
	if (0 == val)
	{
		return 1e10f;
	}

	float di = MathLib::length(new_dist);
	float df;
	if (0 == di)
	{
		df = EdgeDistance(grad[closest], val);
	}
	else
	{
		df = EdgeDistance(new_dist, val);
	}
	return di + df;
}

	void UIListBox::MouseOverHandler(UIDialog const & sender, uint32_t buttons, int2 const & pt)
	{
		// Let the scroll bar handle it first.
		scroll_bar_.MouseOverHandler(sender, buttons, pt);

		if (drag_)
		{
			// Compute the index of the item below cursor

			int nItem;
			if (text_height_ != 0)
			{
				nItem = static_cast<int>(scroll_bar_.GetTrackPos() + (pt.y() - text_rc_.top()) / text_height_);
			}
			else
			{
				nItem = -1;
			}

			// Only proceed if the cursor is on top of an item.

			if ((nItem >= static_cast<int>(scroll_bar_.GetTrackPos()))
				&& (nItem < static_cast<int>(items_.size()))
				&& (nItem < static_cast<int>(scroll_bar_.GetTrackPos() + scroll_bar_.GetPageSize())))
			{
				selected_ = nItem;
				this->OnSelectionEvent()(*this);
			}
			else
			{
				if (nItem < static_cast<int>(scroll_bar_.GetTrackPos()))
				{
					// User drags the mouse above window top
					scroll_bar_.Scroll(-1);
					selected_ = static_cast<int>(scroll_bar_.GetTrackPos());
					this->OnSelectionEvent()(*this);
				}
				else
				{
					if (nItem >= static_cast<int>(scroll_bar_.GetTrackPos() + scroll_bar_.GetPageSize()))
					{
						// User drags the mouse below window bottom
						scroll_bar_.Scroll(1);
						selected_ = static_cast<int>(std::min(items_.size(), scroll_bar_.GetTrackPos() + scroll_bar_.GetPageSize())) - 1;
						this->OnSelectionEvent()(*this);
					}
				}
			}
		}
	}

	void UIPolylineEditBox::MouseDownHandler(UIDialog const & /*sender*/, uint32_t buttons, int2 const & pt)
	{
		if (buttons & MB_Left)
		{
			if (!has_focus_)
			{
				this->GetDialog()->RequestFocus(*this);
			}

			if (this->ContainsPoint(pt))
			{
				float2 p = this->PtFromCoord(pt.x(), pt.y());
				if (MathLib::abs(this->GetValue(p.x()) - p.y()) < 0.1f)
				{
					bool found = false;
					for (int i = 0; i < static_cast<int>(this->NumCtrlPoints()); ++ i)
					{
						float2 cp = this->GetCtrlPoint(i);
						cp = p - cp;
						if (MathLib::dot(cp, cp) < 0.01f)
						{
							this->ActivePoint(i);
							move_point_ = true;
							found = true;
							break;
						}
					}

					if (!found)
					{
						this->AddCtrlPoint(p.x());
						move_point_ = true;
					}
				}
			}
		}
	}

bool ScreenShot(const char *filename)
{
    SDL_Surface *surf = SDL_CreateRGBSurface(0, screensize.x(), screensize.y(), 24,
                                             0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
    if (!surf) return false;

    auto pixels = ReadPixels(int2(0), screensize, false);
    SDL_LockSurface(surf);
    for (int i = 0; i < screensize.y(); i++)
        memcpy(((char *)surf->pixels) + surf->pitch * i,
               pixels + 3 * screensize.x() * (screensize.y() - i - 1),
               screensize.x() * 3);
    SDL_UnlockSurface(surf);
    delete[] pixels;

    bool ok = !SDL_SaveBMP(surf, filename);
    SDL_FreeSurface(surf);
    return ok;
}