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Posted on 1998-07-31
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Last Modified: 2010-03-30
i want to move image from down to top !
I am facing problem in calculating.
how should i do it ?
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Question by:yeda
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Expert Comment

by:shchuka
ID: 1229401
Can you give a bit more details on what calculations you're trying to perform?
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Author Comment

by:yeda
ID: 1229402
I have one gif of man .This gif is displayed initially on top of a building.I want this gif to run on building.So it looks like man running on top of a building.And i want to put a control on this object,such that whenever a player presses space bar this running man jumps down in a parabolic path.

Please supply the code !
Thanking U



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Accepted Solution

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shchuka earned 50 total points
ID: 1229403
Well then.  Assume, your "man" is running from left to right with a constant speed (much easier calculations).

Assume, x is the horizonal coordinate of your image and y is the vertical (top-left corner of the image).  Further, let cvMan be the component with your image (say, canvas).

Then the code will be somethig like this:

int x = 0;
int y =0;
int xIncrement = 2;
while( not space-bar pressed ) {
    cvMan.setLocation(x,y);
    x += xIncrement;
}
//Now for the jump part
int t = 0;                                            //This is the time parameter
int yStart = y;
double gravity = 9.8;                           //Assume gravity on earth
while(y < whatever bottom level) {
    cvMan.setLocation(x,y);
    x += xIncrement;
    y = yStart + gravity * t * t / 2;
    t += 1;                                          //Change the icrement to increase/decrease the
                                                        //speed of fall
}

This is it.  Checking for a key press you can do using a class-level variable, say keypressed, which is initially is set to false, and in the key-press event set it to true.  Then the first loop will look like
while( !keypressed ) {   //and so on
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