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First step for the algorithm of clipping...

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This commit is contained in:
Edouard Dupin 2011-11-10 15:51:20 +01:00
parent ffcaa34037
commit 40f82d2f77
5 changed files with 143 additions and 4 deletions
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5
Sources/ewolOObject.h
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@ -51,7 +51,10 @@ namespace ewol {
void SetName(const char * name);
etk::String GetName(void);
public:
virtual void UpdateOrigin(float x, float y) {};
// use to crop element outside the display
virtual void UpdateSize(float sizeX, float sizeY) { };
// Move to the correct position display
virtual void UpdateOrigin(float x, float y) { };
private:
etk::String m_name;
};

120
Sources/ewolOObject2DColored.cpp
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@ -78,6 +78,125 @@ void ewol::OObject2DColored::UpdateOrigin(float x, float y)
}
}
void generatePolyGone(etk::VectorType<coord2D_ts> & input, etk::VectorType<coord2D_ts> & output )
{
if (input.Size()<3) {
return;
}
coord2D_ts basePoint = input[0];
for (int32_t iii=1; iii<input.Size()-1; iii++) {
output.PushBack(basePoint);
output.PushBack(input[iii]);
output.PushBack(input[iii+1]);
}
}
void SutherlandHodgman(etk::VectorType<coord2D_ts> & input, etk::VectorType<coord2D_ts> & output, float sx, float sy, float ex, float ey)
{
// with Sutherland-Hodgman-Algorithm
if (input.Size() <0) {
return;
}
// last element :
coord2D_ts destPoint;
coord2D_ts lastElement = input[input.Size()-1];
bool inside = true;
if (lastElement.x < 0) {
inside = false;
}
EWOL_DEBUG("generate an crop : ");
for(int32_t iii=0; iii<input.Size(); iii++) {
if(input[iii].x < 0) {
if(true == inside) {
//EWOL_DEBUG("element IN ==> OUT ");
//new point intersection ...
//y=aaax+bbb
//EWOL_DEBUG(" A (" << lastElement.x << "," << lastElement.y << ") A(" << input[iii].x << "," << input[iii].y << ")");
float aaa = (lastElement.y-input[iii].y) / (lastElement.x-input[iii].x);
float bbb = lastElement.y - (aaa*lastElement.x);
//EWOL_DEBUG(" y=" << aaa << "*x + " << bbb << ";");
//==> intersection en x=0 :
destPoint.y = bbb;
destPoint.x = 0;
//EWOL_DEBUG(" ADD (" << destPoint.x << "," << destPoint.y << ")");
output.PushBack(destPoint);
} else {
//EWOL_DEBUG("element OUT ==> OUT ");
}
inside = false;
} else {
if(true == inside) {
//EWOL_DEBUG("element IN ==> IN ");
//EWOL_DEBUG(" ADD (" << input[iii].x << "," << input[iii].y << ")");
output.PushBack(input[iii]);
} else {
//EWOL_DEBUG("element OUT ==> IN ");
//new point intersection ...
//y=aaax+bbb
//EWOL_DEBUG(" A (" << lastElement.x << "," << lastElement.y << ") A(" << input[iii].x << "," << input[iii].y << ")");
float aaa = (lastElement.y-input[iii].y) / (lastElement.x-input[iii].x);
float bbb = lastElement.y - (aaa*lastElement.x);
//EWOL_DEBUG(" y=" << aaa << "*x + " << bbb << ";");
//==> intersection en x=0 :
destPoint.y = bbb;
destPoint.x = 0;
//EWOL_DEBUG(" ADD (" << destPoint.x << "," << destPoint.y << ")");
output.PushBack(destPoint);
//EWOL_DEBUG(" ADD (" << input[iii].x << "," << input[iii].y << ")");
output.PushBack(input[iii]);
}
inside = true;
}
// update the last point position :
lastElement.x = input[iii].x;
lastElement.y = input[iii].y;
}
EWOL_DEBUG("generate an crop on element : " << input.Size()<< " ==> " << output.Size() );
}
void ewol::OObject2DColored::UpdateSize(float sizeX, float sizeY)
{
// copy the data
etk::VectorType<coord2D_ts> coord = m_coord;
etk::VectorType<color_ts> color = m_coordColor;
// Clear the generated display ...
m_coord.Clear();
m_coordColor.Clear();
// Check if the triangle is in the area...
int32_t nbTriangle = coord.Size()/3;
for (int32_t iii=0; iii<nbTriangle; iii++) {
if( coord[iii*3+0].x >= 0.0 && coord[iii*3+0].x < sizeX
&& coord[iii*3+0].y >= 0.0 && coord[iii*3+0].y < sizeY
&& coord[iii*3+1].x >= 0.0 && coord[iii*3+1].x < sizeX
&& coord[iii*3+1].y >= 0.0 && coord[iii*3+1].y < sizeY
&& coord[iii*3+2].x >= 0.0 && coord[iii*3+2].x < sizeX
&& coord[iii*3+2].y >= 0.0 && coord[iii*3+2].y < sizeY)
{
// point 1-2-3 inside
m_coord.PushBack(coord[iii*3+0]);
m_coordColor.PushBack(color[iii*3+0]);
m_coord.PushBack(coord[iii*3+1]);
m_coordColor.PushBack(color[iii*3+1]);
m_coord.PushBack(coord[iii*3+2]);
m_coordColor.PushBack(color[iii*3+2]);
} else {
etk::VectorType<coord2D_ts> tmpCoord;
etk::VectorType<coord2D_ts> tmpCoordOut;
tmpCoord.PushBack(coord[iii*3+0]);
tmpCoord.PushBack(coord[iii*3+1]);
tmpCoord.PushBack(coord[iii*3+2]);
SutherlandHodgman(tmpCoord, tmpCoordOut, 0, 0, sizeX, sizeY);
tmpCoord.Clear();
generatePolyGone(tmpCoordOut, tmpCoord);
for (int32_t jjj=0; jjj<tmpCoord.Size(); jjj++) {
m_coord.PushBack(tmpCoord[jjj]);
m_coordColor.PushBack(color[iii*3+0]);
}
}
}
}
void ewol::OObject2DColored::GenerateTriangle(void)
{
@ -244,7 +363,6 @@ void ewol::OObject2DColored::Circle(float x, float y, float radius, float thickn
void ewol::OObject2DColored::Disc(float x, float y, float radius)
{
ResetCount();
coord2D_ts point;
if (radius<0) {
radius *= -1;
}

1
Sources/ewolOObject2DColored.h
View File

@ -60,6 +60,7 @@ namespace ewol {
//void DiscPart(float x, float y, float radius, float angleStart, float angleStop);
public:
// Ewol internal ... : done to update at the origin of the widget ...
virtual void UpdateSize(float sizeX, float sizeY);
virtual void UpdateOrigin(float x, float y);
};
};

4
Sources/ewolWidget.cpp
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@ -180,7 +180,9 @@ void ewol::Widget::AddOObject(ewol::OObject* newObject, etk::String name)
return;
}
newObject->SetName(name);
//EWOL_INFO("UPDATE AT origin : (" << m_origin.x << "," << m_origin.y << ")");
//EWOL_INFO("UPDATE AT size : (" << m_size.x << "," << m_size.y << ")");
newObject->UpdateSize(m_size.x, m_size.y);
//EWOL_INFO("UPDATE AT origin : (" << m_origin.x << "," << m_origin.y << ")");
newObject->UpdateOrigin(m_origin.x, m_origin.y);
m_listOObject.PushBack(newObject);
}

17
Sources/widget/ewolTest.cpp
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@ -57,8 +57,8 @@ void ewol::Test::OnRegenerateDisplay(void)
{
// clean the object list ...
ClearOObjectList();
ewol::OObject2DColored * tmpOObjects = new ewol::OObject2DColored;
tmpOObjects->SetColor(1.0, 0.0, 0.0, 1.0);
tmpOObjects->Rectangle( 0, 0, m_size.x, m_size.y);
tmpOObjects->SetColor(1.0, 1.0, 1.0, 1.0);
@ -146,6 +146,21 @@ void ewol::Test::OnRegenerateDisplay(void)
size.x = m_size.x-6;
size.y = m_size.y-6;
AddEventArea(origin, size, FLAG_EVENT_INPUT_1 | FLAG_EVENT_INPUT_CLICKED_ALL, ewolEventTestPressed);
//tmpOObjects->SetColor(1.0, 0.0, 0.0, 1.0);
/*
tmpOObjects->SetPoint(-20, -20);
tmpOObjects->SetPoint(50, 50);
tmpOObjects->SetPoint(-20, 100);
*/
/*
tmpOObjects->SetPoint(20, -20);
tmpOObjects->SetPoint(50, 50);
tmpOObjects->SetPoint(-20, 100);
AddOObject(tmpOObjects, "BouttonDecoration");
*/
}
bool ewol::Test::OnEventArea(const char * generateEventId, double x, double y)