12. November 2010
Slider bearbeiten
VSlider sliderR = null;
VSlider sliderG = null;
VSlider sliderB = null;
void setup()
{
size(300, 600);
sliderR = new VSlider(100,50,20,500,.5);
sliderG = new VSlider(150,50,20,500,.5);
sliderB = new VSlider(200,50,20,500,.5);
}
void draw()
{
background(sliderR.pos() * 255,sliderG.pos() * 255,sliderB.pos() * 255);
sliderR.draw();
sliderG.draw();
sliderB.draw();
}
void mousePressed()
{
sliderR.mousePos(mouseX,mouseY,true);
sliderG.mousePos(mouseX,mouseY,true);
sliderB.mousePos(mouseX,mouseY,true);
}
void mouseDragged()
{
sliderR.mousePos(mouseX,mouseY,true);
sliderG.mousePos(mouseX,mouseY,true);
sliderB.mousePos(mouseX,mouseY,true);}
}
klasse:
class VSlider
{
PVector _p1;
PVector _p2;
int _w;
float _pos;
VSlider(int x,int y,int w,int h,float pos)
{
_p1 = new PVector(x+ w*.5,y);
_p2 = new PVector(x+ w*.5,y+h);
_w = w;
_pos = pos;
if(_pos > 1.0)
_pos = 1.0;
else if(_pos < 0.0)
_pos = 0.0;
}
float pos()
{
return _pos;
}
boolean isHit(int x,int y) //WO IST DIE maus?
{
if(y > _p1.y && y < _p2.y &&
x > _p1.x -10 && x < _p1.x +10)
return true;
else
return false;
}
void draw()
{
pushStyle();
drawSlider();
drawKnob();
popStyle();
}
void drawSlider()
{
stroke(225);
line(_p1.x,_p1.y,_p2.x,_p2.y);
line(_p1.x-0.5*_w,_p1.y,_p1.x+0.5*_w,_p1.y);
line(_p2.x-0.5*_w,_p2.y,_p2.x+0.5*_w,_p2.y);
}
void drawKnob()
{
stroke(255);
fill(0);
PVector dir = PVector.sub(_p2,_p1);
PVector pos = PVector.add( _p1 , PVector.mult(dir,_pos));
rect(pos.x-10,pos.y-30,20,60);
}
void mousePos(int x,int y,boolean pressed) //boolean = wert entweder 0 und 1
{
if(pressed)
{
if(isHit(x,y))
{ // move knob
PVector dir = PVector.sub(_p2,_p1);
_pos = 1.0 / dir.mag() * (y - _p1.y);
}
}
else
{ // mouse over
}
}
}