SFML/src/SFML/Graphics/Text.cpp at master · sharedptr/SFML · GitHub

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////////////////////////////////////////////////////////////

// SFML - Simple and Fast Multimedia Library

// This software is provided 'as-is', without any express or implied warranty.

// In no event will the authors be held liable for any damages arising from the use of this software.

// Permission is granted to anyone to use this software for any purpose,

// including commercial applications, and to alter it and redistribute it freely,

// subject to the following restrictions:

// 1. The origin of this software must not be misrepresented;

// you must not claim that you wrote the original software.

// If you use this software in a product, an acknowledgment

// in the product documentation would be appreciated but is not required.

// 2. Altered source versions must be plainly marked as such,

// and must not be misrepresented as being the original software.

// 3. This notice may not be removed or altered from any source distribution.

////////////////////////////////////////////////////////////

// Headers

////////////////////////////////////////////////////////////

#include <SFML/Graphics/Text.hpp>

#include <SFML/Graphics/Texture.hpp>

#include <SFML/Graphics/RenderTarget.hpp>

#include <cassert>

namespace sf

{

////////////////////////////////////////////////////////////

Text::Text() :

m_string (),

m_font (NULL),

m_characterSize(30),

m_style (Regular),

m_color (255, 255, 255),

m_vertices (Quads),

m_bounds ()

{

}

////////////////////////////////////////////////////////////

Text::Text(const String& string, const Font& font, unsigned int characterSize) :

m_string (string),

m_font (&font),

m_characterSize(characterSize),

m_style (Regular),

m_color (255, 255, 255),

m_vertices (Quads),

m_bounds ()

{

updateGeometry();

}

////////////////////////////////////////////////////////////

void Text::setString(const String& string)

{

m_string = string;

updateGeometry();

}

////////////////////////////////////////////////////////////

void Text::setFont(const Font& font)

{

if (m_font != &font)

{

m_font = &font;

updateGeometry();

}

////////////////////////////////////////////////////////////

void Text::setCharacterSize(unsigned int size)

{

if (m_characterSize != size)

{

m_characterSize = size;

updateGeometry();

}

////////////////////////////////////////////////////////////

void Text::setStyle(Uint32 style)

{

if (m_style != style)

{

m_style = style;

updateGeometry();

}

////////////////////////////////////////////////////////////

void Text::setColor(const Color& color)

{

if (color != m_color)

{

m_color = color;

for (unsigned int i = 0; i < m_vertices.getVertexCount(); ++i)

m_vertices[i].color = m_color;

}

////////////////////////////////////////////////////////////

const String& Text::getString() const

{

return m_string;

}

////////////////////////////////////////////////////////////

const Font* Text::getFont() const

{

return m_font;

}

////////////////////////////////////////////////////////////

unsigned int Text::getCharacterSize() const

{

return m_characterSize;

}

////////////////////////////////////////////////////////////

Uint32 Text::getStyle() const

{

return m_style;

}

////////////////////////////////////////////////////////////

const Color& Text::getColor() const

{

return m_color;

}

////////////////////////////////////////////////////////////

Vector2f Text::findCharacterPos(std::size_t index) const

{

// Make sure that we have a valid font

if (!m_font)

return Vector2f();

// Adjust the index if it's out of range

if (index > m_string.getSize())

index = m_string.getSize();

// Precompute the variables needed by the algorithm

bool bold = (m_style & Bold) != 0;

float hspace = static_cast<float>(m_font->getGlyph(L' ', m_characterSize, bold).advance);

float vspace = static_cast<float>(m_font->getLineSpacing(m_characterSize));

// Compute the position

Vector2f position;

Uint32 prevChar = 0;

for (std::size_t i = 0; i < index; ++i)

{

Uint32 curChar = m_string[i];

// Apply the kerning offset

position.x += static_cast<float>(m_font->getKerning(prevChar, curChar, m_characterSize));

prevChar = curChar;

// Handle special characters

switch (curChar)

{

case ' ' : position.x += hspace; continue;

case '\t' : position.x += hspace * 4; continue;

case '\n' : position.y += vspace; position.x = 0; continue;

case '\v' : position.y += vspace * 4; continue;

}

// For regular characters, add the advance offset of the glyph

position.x += static_cast<float>(m_font->getGlyph(curChar, m_characterSize, bold).advance);

}

// Transform the position to global coordinates

position = getTransform().transformPoint(position);

return position;

}

////////////////////////////////////////////////////////////

FloatRect Text::getLocalBounds() const

{

return m_bounds;

}

////////////////////////////////////////////////////////////

FloatRect Text::getGlobalBounds() const

{

return getTransform().transformRect(getLocalBounds());

}

////////////////////////////////////////////////////////////

void Text::draw(RenderTarget& target, RenderStates states) const

{

if (m_font)

{

states.transform *= getTransform();

states.texture = &m_font->getTexture(m_characterSize);

target.draw(m_vertices, states);

}

////////////////////////////////////////////////////////////

void Text::updateGeometry()

{

// Clear the previous geometry

m_vertices.clear();

m_bounds = FloatRect();

// No font: nothing to draw

if (!m_font)

return;

// No text: nothing to draw

if (m_string.isEmpty())

return;

// Compute values related to the text style

bool bold = (m_style & Bold) != 0;

bool underlined = (m_style & Underlined) != 0;

float italic = (m_style & Italic) ? 0.208f : 0.f; // 12 degrees

float underlineOffset = m_characterSize * 0.1f;

float underlineThickness = m_characterSize * (bold ? 0.1f : 0.07f);

// Precompute the variables needed by the algorithm

float hspace = static_cast<float>(m_font->getGlyph(L' ', m_characterSize, bold).advance);

float vspace = static_cast<float>(m_font->getLineSpacing(m_characterSize));

float x = 0.f;

float y = static_cast<float>(m_characterSize);

// Create one quad for each character

float minX = static_cast<float>(m_characterSize);

float minY = static_cast<float>(m_characterSize);

float maxX = 0.f;

float maxY = 0.f;

Uint32 prevChar = 0;

for (std::size_t i = 0; i < m_string.getSize(); ++i)

{

Uint32 curChar = m_string[i];

// Apply the kerning offset

x += static_cast<float>(m_font->getKerning(prevChar, curChar, m_characterSize));

prevChar = curChar;

// If we're using the underlined style and there's a new line, draw a line

if (underlined && (curChar == L'\n'))

{

float top = y + underlineOffset;

float bottom = top + underlineThickness;

m_vertices.append(Vertex(Vector2f(0, top), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(x, top), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(x, bottom), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(0, bottom), m_color, Vector2f(1, 1)));

}

// Handle special characters

if ((curChar == ' ') || (curChar == '\t') || (curChar == '\n') || (curChar == '\v'))

{

// Update the current bounds (min coordinates)

minX = std::min(minX, x);

minY = std::min(minY, y);

switch (curChar)

{

case ' ' : x += hspace; break;

case '\t' : x += hspace * 4; break;

case '\n' : y += vspace; x = 0; break;

case '\v' : y += vspace * 4; break;

}

// Update the current bounds (max coordinates)

maxX = std::max(maxX, x);

maxY = std::max(maxY, y);

// Next glyph, no need to create a quad for whitespace

continue;

}

// Extract the current glyph's description

const Glyph& glyph = m_font->getGlyph(curChar, m_characterSize, bold);

int left = glyph.bounds.left;

int top = glyph.bounds.top;

int right = glyph.bounds.left + glyph.bounds.width;

int bottom = glyph.bounds.top + glyph.bounds.height;

float u1 = static_cast<float>(glyph.textureRect.left);

float v1 = static_cast<float>(glyph.textureRect.top);

float u2 = static_cast<float>(glyph.textureRect.left + glyph.textureRect.width);

float v2 = static_cast<float>(glyph.textureRect.top + glyph.textureRect.height);

// Add a quad for the current character

m_vertices.append(Vertex(Vector2f(x + left - italic * top, y + top), m_color, Vector2f(u1, v1)));

m_vertices.append(Vertex(Vector2f(x + right - italic * top, y + top), m_color, Vector2f(u2, v1)));

m_vertices.append(Vertex(Vector2f(x + right - italic * bottom, y + bottom), m_color, Vector2f(u2, v2)));

m_vertices.append(Vertex(Vector2f(x + left - italic * bottom, y + bottom), m_color, Vector2f(u1, v2)));

// Update the current bounds

minX = std::min(minX, x + left - italic * bottom);

maxX = std::max(maxX, x + right - italic * top);

minY = std::min(minY, y + top);

maxY = std::max(maxY, y + bottom);

// Advance to the next character

x += glyph.advance;

}

// If we're using the underlined style, add the last line

if (underlined)

{

float top = y + underlineOffset;

float bottom = top + underlineThickness;

m_vertices.append(Vertex(Vector2f(0, top), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(x, top), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(x, bottom), m_color, Vector2f(1, 1)));

m_vertices.append(Vertex(Vector2f(0, bottom), m_color, Vector2f(1, 1)));

}

// Update the bounding rectangle

m_bounds.left = minX;

m_bounds.top = minY;

m_bounds.width = maxX - minX;

m_bounds.height = maxY - minY;

}

} // namespace sf

SFML/src/SFML/Graphics/Text.cpp at master · sharedptr/SFML · GitHub

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