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Hitting the Blocks
The blocks across the screen are controlled programmatically. Each block is an instance of the same block. A color effect is applied to each to change the color of the blocks. In addition, the following script is applied to each block:
onClipEvent (load) {
startX = this._x
}
This script is used to tell the block to hide if it is crossed by the ball movie clip. The only difference between each block is the instance name; each block has a different name that starts with the word Tile and is followed by a number between 1 and 35.
At the top of the script, you tell the game how many blocks are on the stage:
TileNum = 36;
You then tell Flash how to calculate that the object just hit is a block:
function maketargetList (numOfTiles) {
for (i=0; i<numOfTiles; i++) {
TargetList[i] = String("tile"+(i+1));
}
}
The final step is to add the script that will do something when a block when it is hit:
//check if ball hits a tile
var theTileNum = TargetList.length;
for (i=0; i<theTileNum; i++) {
var thisTile = TargetList[i];
if (this.MovieClip.hitTest(_root[thisTile])) {
this.increaseSpeed();
Total += (10 * CurrentBallNum);
_root[thisTile]._x += -1000;
TargetList.splice(i, 1);
this.flipY();
if (TargetList.length == 0) {
resetGame();
}break;
}
}
Here the script verifies that a target is hit and then increases the games score by 10 points after the collision. The complete game can be seen in Figure 3.
)
Figure
3 The final game.
BreakOut demonstrates collision with a boundary and with a static object.