Ostatnio zmodyfikowano wczoraj o godz. 19:55
tBane Temat założony przez niniejszego użytkownika |
[SFML 2.X] Narzędzie Lasso z użyciem sf::ConvexShape » 2025-08-28 14:14:03 Witam. Próbuję napisać narzędzie Lasso. Narzędzie to ma działać w taki sposób, że można zaznaczać przy jego użyciu dowolny kształt poprzez przesuwanie kursora z naciśniętym lewym przyciskiem myszy. Narzędzie działa poprawnie dla większej ilości punktów, ale przy małej ilości punktów się wykrzacza. Dlaczego ? zarysowany cały kształt  tu także więc jest ok  a tu dopiero co zacząłem zaznaczać w lewo w dół i się wykrzaczyło  #ifndef Lasso_hpp
#define Lasso_hpp
enum class LassoState { None, Selecting, Selected, Moving };
class Lasso {
public:
LassoState state;
std::vector < sf::Vector2f > points;
sf::ConvexShape outline;
Lasso() {
state = LassoState::None;
points.clear();
outline = sf::ConvexShape();
outline.setOutlineColor( sf::Color::Cyan );
outline.setOutlineThickness( 2.0f );
outline.setFillColor( sf::Color::Transparent );
}
~Lasso() { }
void addPoint( sf::Vector2f p ) {
if( points.empty() || sqrt( pow( points.back().x - p.x, 2 ) + pow( points.back().y - p.y, 2 ) ) > 4.0f ) {
points.push_back( p );
outline.setPointCount( points.size() );
outline.setPoint( points.size() - 1, p );
}
}
void draw() {
if( outline.getPointCount() > 2 )
window->draw( outline );
else {
}
}
};
Lasso * lasso = nullptr;
#endif
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DejaVu |
» 2025-08-28 16:01:50 A czy przeczytałeś czy dozwolone jest tworzenie kształtu, gdzie 'obwódka' rysowana się przecina sama ze sobą? np. jeżeli liczbę 8 chciałbyś narysować. |
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tBane Temat założony przez niniejszego użytkownika |
» 2025-08-28 16:13:34 No właśnie nie wiem, ale wtedy też się wykrzacza. Czyli co, zastąpić sf::ConvexShape? Tylko czym?  |
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tBane Temat założony przez niniejszego użytkownika |
» 2025-08-28 18:36:06 Dobra. Zrobię to z użyciem sf::VertexArray(sf::LineStrip);. Pomęczę ChatGPT z shaderami na obwódkę (właśnie dlatego chciałem użyć sf::ConvexShape) i dam znać czy się udało |
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tBane Temat założony przez niniejszego użytkownika |
» 2025-08-28 19:00:30 Mam taki kod. Ale czasem przesuwa krawędzie .. #include <SFML/Graphics.hpp>
#include <vector>
#include <cmath>
std::string lasso_image_width_outline_source = R"(
uniform sampler2D texture;
uniform sampler2D mask;
uniform vec2 maskSize;
uniform float outlineSize;
uniform vec4 outlineColor;
void main() {
vec2 uv = gl_TexCoord[0].xy;
vec2 muv = uv;
muv.y = 1.0 - muv.y;
vec4 base = texture2D(texture, uv);
float aCenter = texture2D(mask, muv).a;
vec2 texel = 1.0 / maskSize;
int r = int(floor(outlineSize + 0.5));
float aMax = 0.0;
float aMin = 1.0;
for (int j = -r; j <= r; ++j) {
for (int i = -r; i <= r; ++i) {
vec2 off = vec2(float(i), float(j)) * texel;
float s = texture2D(mask, muv + off).a;
aMax = max(aMax, s);
aMin = min(aMin, s);
}
}
float dilated = step(0.5, aMax);
float eroded = step(0.5, aMin);
float edge = clamp(dilated - eroded, 0.0, 1.0);
vec4 masked = vec4(base.rgb, base.a * aCenter);
vec3 outRGB = mix(masked.rgb, outlineColor.rgb, edge * outlineColor.a);
float outA = max(masked.a, edge * outlineColor.a);
gl_FragColor = vec4(outRGB, outA);
}
)";
std::string lasso_only_outline_source = R"(
uniform sampler2D mask;
uniform vec2 maskSize;
uniform float outlineSize;
uniform vec4 outlineColor;
void main() {
vec2 uv = gl_TexCoord[0].xy;
float aCenter = texture2D(mask, uv).a;
vec2 texel = 1.0 / maskSize;
int r = int(floor(outlineSize + 0.5));
float aMax = 0.0;
float aMin = 1.0;
for (int j = -r; j <= r; ++j) {
for (int i = -r; i <= r; ++i) {
vec2 off = vec2(float(i), float(j)) * texel;
float s = texture2D(mask, uv + off).a;
aMax = max(aMax, s);
aMin = min(aMin, s);
}
}
float dilated = step(0.5, aMax);
float eroded = step(0.5, aMin);
float edge = clamp(dilated - eroded, 0.0, 1.0);
gl_FragColor = vec4(outlineColor.rgb, outlineColor.a * edge);
}
)";
sf::RenderWindow * window;
sf::Texture texture;
sf::Sprite sprite;
sf::RenderTexture mask;
sf::Sprite maskSprite;
sf::Shader shader1;
sf::Shader shader2;
std::vector < sf::Vector2f > points;
sf::VertexArray outline;
bool pointInPolygon( std::vector < sf::Vector2f > & points, sf::Vector2f p ) {
bool inside = false;
for( int i = 0, j = points.size() - 1; i < points.size(); j = i++ ) {
sf::Vector2f A = points[ i ];
sf::Vector2f B = points[ j ];
bool inter =(( A.y > p.y ) !=( B.y > p.y ) ) &&( p.x <( B.x - A.x ) *( p.y - A.y ) /( B.y - A.y ) + A.x );
if( inter )
inside = !inside;
}
return inside;
}
void pushPoint( sf::Vector2f p, std::vector < sf::Vector2f > & points, sf::VertexArray & outline ) {
if( points.empty() || std::hypot( points.back().x - p.x, points.back().y - p.y ) > 2.0f ) {
points.push_back( p );
outline.append( sf::Vertex( p, sf::Color::Cyan ) );
}
}
void generateImage( std::vector < sf::Vector2f > points ) {
if( points.size() < 3 ) return;
sf::Vector2f centroid( 0.f, 0.f );
for( auto & p: points )
centroid += p;
centroid.x /= points.size();
centroid.y /= points.size();
sf::VertexArray fan( sf::TriangleFan );
fan.append( sf::Vertex( centroid, sf::Color::White ) );
for( auto & p: points )
fan.append( sf::Vertex( p, sf::Color::White ) );
fan.append( sf::Vertex( points.front(), sf::Color::White ) ); mask.clear( sf::Color::Transparent );
mask.draw( fan, sf::RenderStates( sf::BlendNone ) );
mask.display();
shader1.setUniform( "mask", mask.getTexture() );
}
void generateOutline( std::vector < sf::Vector2f > points ) {
if( points.size() < 3 ) return;
sf::Vector2f centroid( 0.f, 0.f );
for( auto & p: points )
centroid += p;
centroid.x /= points.size();
centroid.y /= points.size();
sf::VertexArray fan( sf::TrianglesFan );
fan.append( sf::Vertex( centroid, sf::Color::White ) );
for( auto & p: points )
fan.append( sf::Vertex( p, sf::Color::White ) );
fan.append( sf::Vertex( points.front(), sf::Color::White ) ); mask.clear( sf::Color::Transparent );
mask.draw( fan, sf::RenderStates( sf::BlendNone ) );
mask.display();
shader2.setUniform( "mask", mask.getTexture() );
}
int main() {
window = new sf::RenderWindow( sf::VideoMode( 1000, 600 ), "Lasso" );
texture.loadFromFile( "image.png" );
sprite = sf::Sprite( texture );
mask.create( texture.getSize().x, texture.getSize().y );
mask.clear( sf::Color::Transparent );
mask.display();
maskSprite = sf::Sprite( mask.getTexture() );
shader1.loadFromMemory( lasso_image_width_outline_source, sf::Shader::Fragment );
shader1.setUniform( "texture", texture );
shader1.setUniform( "mask", mask.getTexture() );
shader1.setUniform( "maskSize", sf::Glsl::Vec2( mask.getSize().x, mask.getSize().y ) );
shader1.setUniform( "outlineSize", 1.f );
shader1.setUniform( "outlineColor", sf::Glsl::Vec4( 0, 1, 1, 1 ) ); shader2.loadFromMemory( lasso_only_outline_source, sf::Shader::Fragment );
shader2.setUniform( "maskSize", sf::Glsl::Vec2( mask.getSize().x, mask.getSize().y ) );
shader2.setUniform( "outlineSize", 1.f );
shader2.setUniform( "outlineColor", sf::Glsl::Vec4( 0, 1, 1, 1 ) ); points.clear();
bool drawing = false;
outline = sf::VertexArray( sf::LineStrip );
while( window->isOpen() ) {
sf::Vector2i mousePosition = sf::Mouse::getPosition( * window );
sf::Vector2f worldMousePosition = window->mapPixelToCoords( mousePosition );
sf::Event ev;
while( window->pollEvent( ev ) ) {
if( ev.type == sf::Event::Closed ) window->close();
if( ev.type == sf::Event::MouseButtonPressed && ev.mouseButton.button == sf::Mouse::Left ) {
drawing = true;
points.clear();
outline.clear();
pushPoint( worldMousePosition, points, outline );
}
if( ev.type == sf::Event::MouseMoved && drawing ) {
pushPoint( worldMousePosition, points, outline );
generateOutline( points );
}
if( ev.type == sf::Event::MouseButtonReleased && ev.mouseButton.button == sf::Mouse::Left ) {
drawing = false;
generateImage( points );
}
if( ev.type == sf::Event::KeyPressed && ev.key.code == sf::Keyboard::C ) {
mask.clear( sf::Color::Transparent );
mask.display();
shader1.setUniform( "mask", mask.getTexture() );
points.clear();
outline.clear();
}
}
window->clear( sf::Color( 30, 30, 34 ) );
if( !drawing && outline.getVertexCount() >= 3 ) {
sf::RenderStates rs;
rs.shader = & shader1;
window->draw( sprite, rs );
}
if( drawing && outline.getVertexCount() >= 3 ) {
sf::RenderStates rs;
rs.shader = & shader2;
window->draw( maskSprite, rs );
}
window->display();
}
return 0;
}
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tBane Temat założony przez niniejszego użytkownika |
» 2025-08-28 19:55:49 Dobra. Udało sie napisać. Obwódka to sf::VertexArray fan( sf::LineStrip ); a obraz to sf::VertexArray fan( sf::TriangleFan ); #include <SFML/Graphics.hpp>
#include <vector>
#include <cmath>
std::string lasso_image_width_outline_source = R"(
uniform sampler2D texture;
uniform sampler2D mask;
uniform vec2 maskSize;
uniform float outlineSize;
uniform vec4 outlineColor;
void main() {
vec2 uv = gl_TexCoord[0].xy;
vec2 muv = uv;
muv.y = 1.0 - muv.y;
vec4 base = texture2D(texture, uv);
float aCenter = texture2D(mask, muv).a;
vec2 texel = 1.0 / maskSize;
int r = int(floor(outlineSize + 0.5));
float aMax = 0.0;
float aMin = 1.0;
for (int j = -r; j <= r; ++j) {
for (int i = -r; i <= r; ++i) {
vec2 off = vec2(float(i), float(j)) * texel;
float s = texture2D(mask, muv + off).a;
aMax = max(aMax, s);
aMin = min(aMin, s);
}
}
float dilated = step(0.5, aMax);
float eroded = step(0.5, aMin);
float edge = clamp(dilated - eroded, 0.0, 1.0);
vec4 masked = vec4(base.rgb, base.a * aCenter);
vec3 outRGB = mix(masked.rgb, outlineColor.rgb, edge * outlineColor.a);
float outA = max(masked.a, edge * outlineColor.a);
gl_FragColor = vec4(outRGB, outA);
}
)";
std::string lasso_only_outline_source = R"(
uniform sampler2D mask;
uniform vec2 maskSize;
uniform float outlineSize;
uniform vec4 outlineColor;
void main() {
vec2 uv = gl_TexCoord[0].xy;
float aCenter = texture2D(mask, uv).a;
vec2 texel = 1.0 / maskSize;
int r = int(floor(outlineSize + 0.5));
float aMax = 0.0;
float aMin = 1.0;
for (int j = -r; j <= r; ++j) {
for (int i = -r; i <= r; ++i) {
vec2 off = vec2(float(i), float(j)) * texel;
float s = texture2D(mask, uv + off).a;
aMax = max(aMax, s);
aMin = min(aMin, s);
}
}
float dilated = step(0.5, aMax);
float eroded = step(0.5, aMin);
float edge = clamp(dilated - eroded, 0.0, 1.0);
gl_FragColor = vec4(outlineColor.rgb, outlineColor.a * edge);
}
)";
sf::RenderWindow * window;
sf::Texture texture;
sf::Sprite sprite;
sf::RenderTexture mask;
sf::Sprite maskSprite;
sf::Shader shader1;
sf::Shader shader2;
std::vector < sf::Vector2f > points;
sf::VertexArray outline;
bool pointInPolygon( std::vector < sf::Vector2f > & points, sf::Vector2f p ) {
bool inside = false;
for( int i = 0, j = points.size() - 1; i < points.size(); j = i++ ) {
sf::Vector2f A = points[ i ];
sf::Vector2f B = points[ j ];
bool inter =(( A.y > p.y ) !=( B.y > p.y ) ) &&( p.x <( B.x - A.x ) *( p.y - A.y ) /( B.y - A.y ) + A.x );
if( inter )
inside = !inside;
}
return inside;
}
void pushPoint( sf::Vector2f p, std::vector < sf::Vector2f > & points, sf::VertexArray & outline ) {
if( points.empty() || std::hypot( points.back().x - p.x, points.back().y - p.y ) > 2.0f ) {
points.push_back( p );
outline.append( sf::Vertex( p, sf::Color::Cyan ) );
}
}
void generateImage( std::vector < sf::Vector2f > points ) {
if( points.size() < 3 ) return;
sf::Vector2f centroid( 0.f, 0.f );
for( auto & p: points )
centroid += p;
centroid.x /= points.size();
centroid.y /= points.size();
sf::VertexArray fan( sf::TriangleFan );
fan.append( sf::Vertex( centroid, sf::Color::White ) );
for( auto & p: points )
fan.append( sf::Vertex( p, sf::Color::White ) );
fan.append( sf::Vertex( points.front(), sf::Color::White ) ); mask.clear( sf::Color::Transparent );
mask.draw( fan, sf::RenderStates( sf::BlendNone ) );
mask.display();
shader1.setUniform( "mask", mask.getTexture() );
}
void generateOutline( std::vector < sf::Vector2f > points ) {
if( points.size() < 3 ) return;
sf::VertexArray fan( sf::LineStrip );
for( auto & p: points )
fan.append( sf::Vertex( p, sf::Color::White ) );
mask.clear( sf::Color::Transparent );
mask.draw( fan, sf::RenderStates( sf::BlendNone ) );
mask.display();
shader2.setUniform( "mask", mask.getTexture() );
}
int main() {
window = new sf::RenderWindow( sf::VideoMode( 1000, 600 ), "Lasso" );
texture.loadFromFile( "image.png" );
sprite = sf::Sprite( texture );
mask.create( texture.getSize().x, texture.getSize().y );
mask.clear( sf::Color::Transparent );
mask.display();
maskSprite = sf::Sprite( mask.getTexture() );
shader1.loadFromMemory( lasso_image_width_outline_source, sf::Shader::Fragment );
shader1.setUniform( "texture", texture );
shader1.setUniform( "mask", mask.getTexture() );
shader1.setUniform( "maskSize", sf::Glsl::Vec2( mask.getSize().x, mask.getSize().y ) );
shader1.setUniform( "outlineSize", 1.f );
shader1.setUniform( "outlineColor", sf::Glsl::Vec4( 0, 1, 1, 1 ) ); shader2.loadFromMemory( lasso_only_outline_source, sf::Shader::Fragment );
shader2.setUniform( "maskSize", sf::Glsl::Vec2( mask.getSize().x, mask.getSize().y ) );
shader2.setUniform( "outlineSize", 1.f );
shader2.setUniform( "outlineColor", sf::Glsl::Vec4( 0, 1, 1, 1 ) ); points.clear();
bool drawing = false;
outline = sf::VertexArray( sf::LineStrip );
while( window->isOpen() ) {
sf::Vector2i mousePosition = sf::Mouse::getPosition( * window );
sf::Vector2f worldMousePosition = window->mapPixelToCoords( mousePosition );
sf::Event ev;
while( window->pollEvent( ev ) ) {
if( ev.type == sf::Event::Closed ) window->close();
if( ev.type == sf::Event::MouseButtonPressed && ev.mouseButton.button == sf::Mouse::Left ) {
drawing = true;
points.clear();
outline.clear();
pushPoint( worldMousePosition, points, outline );
}
if( ev.type == sf::Event::MouseMoved && drawing ) {
pushPoint( worldMousePosition, points, outline );
generateOutline( points );
}
if( ev.type == sf::Event::MouseButtonReleased && ev.mouseButton.button == sf::Mouse::Left ) {
drawing = false;
generateImage( points );
}
if( ev.type == sf::Event::KeyPressed && ev.key.code == sf::Keyboard::C ) {
mask.clear( sf::Color::Transparent );
mask.display();
shader1.setUniform( "mask", mask.getTexture() );
points.clear();
outline.clear();
}
}
window->clear( sf::Color( 30, 30, 34 ) );
if( !drawing && outline.getVertexCount() >= 3 ) {
sf::RenderStates rs;
rs.shader = & shader1;
window->draw( sprite, rs );
}
if( drawing && outline.getVertexCount() >= 3 ) {
sf::RenderStates rs;
rs.shader = & shader2;
window->draw( maskSprite, rs );
}
window->display();
}
return 0;
}
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