SFML/src/SFML/Graphics/Shape.cpp at master · binary1248/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/Shape.hpp>

#include <SFML/Graphics/RenderTarget.hpp>

#include <SFML/Graphics/Texture.hpp>

#include <SFML/System/Err.hpp>

#include <cmath>

namespace

{

// Compute the normal of a segment

sf::Vector2f computeNormal(const sf::Vector2f& p1, const sf::Vector2f& p2)

{

sf::Vector2f normal(p1.y - p2.y, p2.x - p1.x);

float length = std::sqrt(normal.x * normal.x + normal.y * normal.y);

if (length != 0.f)

normal /= length;

return normal;

}

// Compute the dot product of two vectors

float dotProduct(const sf::Vector2f& p1, const sf::Vector2f& p2)

{

return p1.x * p2.x + p1.y * p2.y;

}

namespace sf

{

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

Shape::~Shape()

{

}

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

void Shape::setTexture(const Texture* texture, bool resetRect)

{

if (texture)

{

// Recompute the texture area if requested, or if there was no texture & rect before

if (resetRect || (!m_texture && (m_textureRect == IntRect())))

setTextureRect(IntRect(0, 0, texture->getSize().x, texture->getSize().y));

}

// Assign the new texture

m_texture = texture;

}

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

const Texture* Shape::getTexture() const

{

return m_texture;

}

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

void Shape::setTextureRect(const IntRect& rect)

{

m_textureRect = rect;

updateTexCoords();

}

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

const IntRect& Shape::getTextureRect() const

{

return m_textureRect;

}

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

void Shape::setFillColor(const Color& color)

{

m_fillColor = color;

updateFillColors();

}

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

const Color& Shape::getFillColor() const

{

return m_fillColor;

}

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

void Shape::setOutlineColor(const Color& color)

{

m_outlineColor = color;

updateOutlineColors();

}

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

const Color& Shape::getOutlineColor() const

{

return m_outlineColor;

}

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

void Shape::setOutlineThickness(float thickness)

{

m_outlineThickness = thickness;

update(); // recompute everything because the whole shape must be offset

}

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

float Shape::getOutlineThickness() const

{

return m_outlineThickness;

}

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

FloatRect Shape::getLocalBounds() const

{

return m_bounds;

}

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

FloatRect Shape::getGlobalBounds() const

{

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

}

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

Shape::Shape() :

m_texture (NULL),

m_textureRect (),

m_fillColor (255, 255, 255),

m_outlineColor (255, 255, 255),

m_outlineThickness(0),

m_vertices (TriangleFan),

m_outlineVertices (TriangleStrip),

m_insideBounds (),

m_bounds ()

{

}

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

void Shape::update()

{

// Get the total number of points of the shape

std::size_t count = getPointCount();

if (count < 3)

{

m_vertices.resize(0);

m_outlineVertices.resize(0);

return;

}

m_vertices.resize(count + 2); // + 2 for center and repeated first point

// Position

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

m_vertices[i + 1].position = getPoint(i);

m_vertices[count + 1].position = m_vertices[1].position;

// Update the bounding rectangle

m_vertices[0] = m_vertices[1]; // so that the result of getBounds() is correct

m_insideBounds = m_vertices.getBounds();

// Compute the center and make it the first vertex

m_vertices[0].position.x = m_insideBounds.left + m_insideBounds.width / 2;

m_vertices[0].position.y = m_insideBounds.top + m_insideBounds.height / 2;

// Color

updateFillColors();

// Texture coordinates

updateTexCoords();

// Outline

updateOutline();

}

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

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

{

states.transform *= getTransform();

// Render the inside

states.texture = m_texture;

target.draw(m_vertices, states);

// Render the outline

if (m_outlineThickness != 0)

{

states.texture = NULL;

target.draw(m_outlineVertices, states);

}

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

void Shape::updateFillColors()

{

for (std::size_t i = 0; i < m_vertices.getVertexCount(); ++i)

m_vertices[i].color = m_fillColor;

}

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

void Shape::updateTexCoords()

{

for (std::size_t i = 0; i < m_vertices.getVertexCount(); ++i)

{

float xratio = m_insideBounds.width > 0 ? (m_vertices[i].position.x - m_insideBounds.left) / m_insideBounds.width : 0;

float yratio = m_insideBounds.height > 0 ? (m_vertices[i].position.y - m_insideBounds.top) / m_insideBounds.height : 0;

m_vertices[i].texCoords.x = m_textureRect.left + m_textureRect.width * xratio;

m_vertices[i].texCoords.y = m_textureRect.top + m_textureRect.height * yratio;

}

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

void Shape::updateOutline()

{

// Return if there is no outline

if (m_outlineThickness == 0.f)

{

m_outlineVertices.clear();

m_bounds = m_insideBounds;

return;

}

std::size_t count = m_vertices.getVertexCount() - 2;

m_outlineVertices.resize((count + 1) * 2);

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

{

std::size_t index = i + 1;

// Get the two segments shared by the current point

Vector2f p0 = (i == 0) ? m_vertices[count].position : m_vertices[index - 1].position;

Vector2f p1 = m_vertices[index].position;

Vector2f p2 = m_vertices[index + 1].position;

// Compute their normal

Vector2f n1 = computeNormal(p0, p1);

Vector2f n2 = computeNormal(p1, p2);

// Make sure that the normals point towards the outside of the shape

// (this depends on the order in which the points were defined)

if (dotProduct(n1, m_vertices[0].position - p1) > 0)

n1 = -n1;

if (dotProduct(n2, m_vertices[0].position - p1) > 0)

n2 = -n2;

// Combine them to get the extrusion direction

float factor = 1.f + (n1.x * n2.x + n1.y * n2.y);

Vector2f normal = (n1 + n2) / factor;

// Update the outline points

m_outlineVertices[i * 2 + 0].position = p1;

m_outlineVertices[i * 2 + 1].position = p1 + normal * m_outlineThickness;

}

// Duplicate the first point at the end, to close the outline

m_outlineVertices[count * 2 + 0].position = m_outlineVertices[0].position;

m_outlineVertices[count * 2 + 1].position = m_outlineVertices[1].position;

// Update outline colors

updateOutlineColors();

// Update the shape's bounds

m_bounds = m_outlineVertices.getBounds();

}

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

void Shape::updateOutlineColors()

{

for (std::size_t i = 0; i < m_outlineVertices.getVertexCount(); ++i)

m_outlineVertices[i].color = m_outlineColor;

}

} // namespace sf

SFML/src/SFML/Graphics/Shape.cpp at master · binary1248/SFML · GitHub

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