Algodoo

Nice work.

This is a good scene with nothing really wrong with it, but I'm going to pick on the code anyway in order to show an example of variable initialization and scope. The following refers to the postStep code in the frog. The present code has (11) "e.this.", (52) "scene.my.", and (0) ":=". The revised code has (0) "e.this.", (17) "scene.my.", and (9) ":=".

To change the code, enter the following in the upper left hand text box of the frog Script widget:
_jumpdelaytime := 0.0;
_frogvel := 0.0;
_randint := (min, max)=>{
min + math.toInt(rand.uniform01 * (max - min))
};

Then change the postStep code to:
(e)=>{
angle >= math.pi * 0.1 ? {
angle = math.pi * 0.1
} : {};
angle <= - math.pi * 0.1 ? {
angle = - math.pi * 0.1
} : {};
frogpos := pos - [0, size(1) / 2];
targetdistance := ((scene.my.targetpos(1) - frogpos(1)) ^ 2 + (scene.my.targetpos(0) - frogpos(0)) ^ 2) ^ 0.5;
targetangle := math.atan((scene.my.targetpos(1) - frogpos(1)) / (scene.my.targetpos(0) - frogpos(0)));
scene.my.playbutton == 1 ? {
_jumpdelaytime = sim.time;
scene.my.stonehit = 0
} : {};
sim.time >= _jumpdelaytime + 0.01 && sim.time <= _jumpdelaytime + 0.02 ? {
vel = _frogvel;
angle = - 0.05
} : {};
mousedistance := ((app.mousepos(0) - pos(0)) ^ 2 + (app.mousepos(1) - pos(1)) ^ 2) ^ 0.5;
mouseangle := math.atan((app.mousepos(1) - frogpos(1)) / (app.mousepos(0) - frogpos(1)));
heightdiff := scene.my.targetpos(1) - frogpos(1);
horidiff := scene.my.targetpos(0) - frogpos(0);
jumpangle := math.atan((heightdiff + targetdistance) / horidiff);
jumpvectorvel := (sim.gravitystrength * (heightdiff + targetdistance)) ^ 0.5;
scene.my.mode == 1 ? {
_frogvel = [jumpvectorvel * math.cos(jumpangle), jumpvectorvel * math.sin(jumpangle)]
} : {
_frogvel = [scene.my.inputvelocity * math.cos(scene.my.inputangle * math.pi / 180), scene.my.inputvelocity * math.sin(scene.my.inputangle * math.pi / 180)]
};
sim.time >= scene.my.spawndelay + 1.0 && sim.time <= scene.my.spawndelay + 1.005 && scene.my.stonehit == 1 ? {
pos = [_randint(1, 46), 1.0];
scene.my.stonepos = [_randint(56, 63), _randint(3, 24)]
} : {}
}

Thanks Sir,

I will first understand and will sure implement. It will help me to simpify my codes in future too !! I need to learn it correct way because I propose to introduce coding to young students from high school and coach them too. Thanks