Movement + Rotation In Flash
Submitted by Abdul on July 29, 2007 – 3:20 pmNo Comment
Have you seen these flash space games where you can move and rotate a spaceship. well here is how to do it.
1- Load up flash MX and set the document size to 550 by 400. to do this go to modify>document.
2- create a spaceship what ever you want it to be.
3- select it and press on F8 select movieclip and the press ok.
Press on the spaceship now and load up the actions panel by going to windows>actions. make sure it says Actions-Movie clip not Actions-frame.
add the following in the actions box:
Actionscript:
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onClipEvent (load) {
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thrust = 1; //sets speed
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decay = 1;//sets strenght not needed at the moment
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maxSpeed = 15;//maximum speed
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}
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onClipEvent (enterFrame) {
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if (Key.isDown(Key.RIGHT)) { //if right button is down
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_rotation += 10; //rotate 10 degreese clockwise
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}
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if (Key.isDown(Key.LEFT)) { //if left button is down
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_rotation -= 10; //rotate 10 degreese anti-clockwise
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}
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if (Key.isDown(Key.UP)) {//if up button is down
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xSpeed += thrust*Math.sin(_rotation*(Math.PI/180));
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ySpeed += thrust*Math.cos(_rotation*(Math.PI/180));
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} else {
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xSpeed *= decay;
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ySpeed *= decay; //slow down
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}
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speed = Math.sqrt((xSpeed*xSpeed)+(ySpeed*ySpeed));
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if (speed>maxSpeed) {
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xSpeed *= maxSpeed/speed;
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ySpeed *= maxSpeed/speed;
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}
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_y -= ySpeed;
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_x += xSpeed;
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//make the ship come back on screen if it goes out of view
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if (_y<0) {
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_y = 400; // document height
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}
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if (_y>400) {
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_y = 0;
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}
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if (_x<0) {
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_x = 550; //document width
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}
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if (_x>550) {
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_x = 0;
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}
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}
test the movie by clicking control+ enter
That should do the job neatly. If you have any problems or errors coming up please do not hesitate to contact me.
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