// this procedure is called when a key is pressed or released
static void onKeyboard(object sender, SdlDotNet.Input.KeyboardEventArgs args)
{
if (args.Down) {
switch (args.Key) {
case SdlDotNet.Input.Key.RightArrow :
ship.setRotation(-12);
break;
case SdlDotNet.Input.Key.LeftArrow :
ship.setRotation(+12);
break;
case SdlDotNet.Input.Key.UpArrow :
ship.thrust(2);
break;
case SdlDotNet.Input.Key.Space :
if (laser == null) {
laser = new Laser(3,ship.getX(),ship.getY(),12.0,ship.getDirection()+90);
}
break;
case SdlDotNet.Input.Key.Escape :
Events.QuitApplication();
break;
}
} else {
switch (args.Key) {
case SdlDotNet.Input.Key.RightArrow :
case SdlDotNet.Input.Key.LeftArrow :
ship.setRotation(0);
break;
}
}
}
// This procedure is called (invoked) for each window refresh
static void onTick(object sender, TickEventArgs args)
{
// STEP
// Update the automagic elements and enforce the rules of the game here.
ship.move();
if (ship.getX() < 0) {
ship.setX(FRAME_WIDTH);
} else if (ship.getX() > FRAME_WIDTH) {
ship.setX(0);
}
if (ship.getY() < 0) {
ship.setY(FRAME_HEIGHT);
} else if (ship.getY() > FRAME_HEIGHT) {
ship.setY(0);
}
for (int i = 0; i < asteroids.Length; ++i) {
asteroids[i].move();
if (asteroids[i].getX() < 0) {
asteroids[i].setX(FRAME_WIDTH);
} else if (asteroids[i].getX() > FRAME_WIDTH) {
asteroids[i].setX(0);
}
if (asteroids[i].getY() < 0) {
asteroids[i].setY(FRAME_HEIGHT);
} else if (asteroids[i].getY() > FRAME_HEIGHT) {
asteroids[i].setY(0);
}
}
if (laser != null) {
Beam beam = laser.getBeam();
Newtonian.move(beam.getPosition(),beam.getMotion());
if ( (beam.getPosition().getX() < 0)
|| (beam.getPosition().getX() > FRAME_WIDTH)
|| (beam.getPosition().getY() < 0)
|| (beam.getPosition().getY() > FRAME_HEIGHT)) {
laser = null;
}
}
// DRAW
// Draw the new view of the game based on the state of the elements here.
drawBackground();
if (laser != null) {
drawSprite(laser.getSprite(),(int)laser.getBeam().getPosition().getX(), (int)laser.getBeam().getPosition().getY(), (int)laser.getBeam().getMotion().getDirection()+90);
}
drawSprite(ship.getSprite(),ship.getX(),ship.getY(),ship.getDirection());
for (int i = 0; i < asteroids.Length; ++i) {
drawSprite(asteroids[i].getSprite(), asteroids[i].getX(), asteroids[i].getY(), asteroids[i].getDirection());
}
// ANIMATE
// Step the animation frames ready for the next tick
// ...
// REFRESH
// Tranfer the new view to the screen for the user to see.
video.Update();
}
// This procedure is called (invoked) for each window refresh
static void onTick(object sender, TickEventArgs args)
{
// STEP
// Update the automagic elements and enforce the rules of the game here.
duck.move();
step++;
if (step > 60)
{
for (int i = 0; i < asteroids.Length; ++i)
{
if (asteroids[i].getSprite() == 2)
{
asteroids[i].setSprite(1);
}
else
{
asteroids[i].setSprite(2);
}
step = 0;
}
}
if (duck.getX() < 0)
{
duck.setX(FRAME_WIDTH);
}
else if (duck.getX() > FRAME_WIDTH)
{
duck.setX(0);
}
if (duck.getY() < 0)
{
duck.setY(FRAME_HEIGHT);
}
else if (duck.getY() > FRAME_HEIGHT)
{
duck.setY(0);
}
for (int i = 0; i < asteroids.Length; ++i)
{
asteroids[i].move();
if (asteroids[i].getX() < 0)
{
asteroids[i].setX(FRAME_WIDTH);
}
else if (asteroids[i].getX() > FRAME_WIDTH)
{
asteroids[i].setX(0);
}
if (asteroids[i].getY() < 0)
{
asteroids[i].setY(FRAME_HEIGHT);
}
else if (asteroids[i].getY() > FRAME_HEIGHT)
{
asteroids[i].setY(0);
}
}
if (laser != null)
{
Beam beam = laser.getBeam();
Newtonian.move(beam.getPosition(), beam.getMotion());
if ((beam.getPosition().getX() < 0) ||
(beam.getPosition().getX() > FRAME_WIDTH) ||
(beam.getPosition().getY() < 0) ||
(beam.getPosition().getY() > FRAME_HEIGHT))
{
laser = null;
}
}
// DRAW
// Draw the new view of the game based on the state of the elements here.
drawBackground();
if (laser != null)
{
drawSprite(laser.getSprite(), (int)laser.getBeam().getPosition().getX(), (int)laser.getBeam().getPosition().getY(), (int)laser.getBeam().getMotion().getDirection() + 90);
}
drawSprite(duck.getSprite(), duck.getX(), duck.getY(), duck.getDirection());
for (int i = 0; i < asteroids.Length; ++i)
{
drawSprite(asteroids[i].getSprite(), asteroids[i].getX(), asteroids[i].getY(), asteroids[i].getDirection());
}
// ANIMATE
// Step the animation frames ready for the next tick
// ...
// REFRESH
// Tranfer the new view to the screen for the user to see.
video.Update();
}