10. November 2010
Lektion 7 so ändern das man mit mausklicks den sart und Endpunkt der Strecke bestimmt und die Kugel dann diesen Weg hin und zurück fährt.
PVector startPos = new PVector();
PVector endPos = new PVector();
int curTime = 0;
int animSpeed = 9;
int animTime = 2000;
boolean drawFlag=false;
boolean clickClick=false;
void setup()
{
size(640, 480);
smooth();
}
void draw()
{
background(51);
// calc. the anim time
curTime += animSpeed;
if(curTime >= animTime|| curTime <0){
animSpeed = animSpeed *-1;
}
// calc. the current time in the animation
float normTime = curTime * 1.0 / animTime;
if(drawFlag)
{
stroke(255);
line(startPos.x,startPos.y,
endPos.x,endPos.y);
// calculate the position of the circle on the line
PVector dir = PVector.sub(endPos,startPos);
PVector pos = PVector.add( startPos , PVector.mult(dir,normTime));
ellipse(pos.x,pos.y, 20,20);
}
}
void mousePressed()
{
if(clickClick == false){
drawFlag = true;
curTime = 0;
startPos.set(mouseX,mouseY,0);
endPos = startPos.get();
clickClick=true;
}else{
endPos.set(mouseX,mouseY,0);
clickClick=false;
}
}
void mouseDragged()
{
endPos.set(mouseX,mouseY,0);
}
void mouseReleased()
{
drawFlag = true;
println("released");
}