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// coordinate system. myDoors = decoder.createDoors(); myKeys = decoder.createKeys(); // get an array of ints that lists whether each door is // open or closed in the saved game int[] openDoors = info.getDoorsOpen(); for(int i = 0; i < myDoors.length; i++) { append(myDoors[i]); if(openDoors[i] == 0) { // if the door was open, make it invisible myDoors[i].setVisible(false); } } // the keys can be moved by the player, so you get their // coordinates from the GameInfo saved data. int[][] keyCoords = info.getKeyCoords(); for(int i = 0; i < myKeys.length; i++) { append(myKeys[i]); myKeys[i].setPosition(SQUARE_WIDTH * keyCoords[i][0], SQUARE_WIDTH * keyCoords[i][1]); } // if the player was holding a key in the saved game, // you have the player hold that key and set it to invisible. int heldKey = info.getHeldKey(); if(heldKey != -1) { myHeldKey = myKeys[heldKey]; myHeldKey.setVisible(false); } // append the background last so it will be painted first. append(myBackground); // this sets the view screen so that the player is // in the center. myViewWindowX = SQUARE_WIDTH * playerCoords[0] - ((DISP_WIDTH - SQUARE_WIDTH)/2); myViewWindowY = SQUARE_WIDTH * playerCoords[1] - ((DISP_HEIGHT - SQUARE_WIDTH)/2); // a number of objects are created in order to set up the game, // but they should be eliminated to free up memory: decoder = null; System.gc(); } return(retVal); } /** * save the current game in progress. */ void saveGame(int gameTicks) throws Exception {

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I prefer smooth COG shifting bipeds due to their speed and smoothness you probably will, too. They use a single motor to achieve both weight shifting and stepping; hence you need a refined mechanism. In Figure 1-6, you can see the biped robot that I built in August 2004. This particular robot could only walk straight using COG shifting, and was meant to be a prototype for future bipeds that could also turn.

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Figure 5-3. Configuration Console tree node icons The ImageAttribute class has two constructors: one takes a parameter of just System.Type, and the other takes a parameter of System.Type and System.String. The constructor with the single parameter of System.Type uses the System.Type to determine the assembly in which that image is located. It then looks for a resource named namespace. classname.bmp. The namespace and classname are defined by the System.Type parameter passed in. The constructor with the System.Type and System.String parameters works a little differently. In this instance, the System.Type determines in which assembly to look and the namespace it will use to find the resource. However, the System.String will determine the specific resource within the namespace to find the image.

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Figure 1-6. COG-shifting Biped I My Advanced COG Biped (dated October 2004), shown in Figure 1-7, features a smooth walking gait and can turn thanks to a motorized rotating ankle. The left foot includes a motor to allow it to turn, while the other foot is built of normal parts (in the Robotics Invention System kit, there were only two motors), trying to balance the other foot s weight. On each foot, a touch sensor lets the robot know which foot is touching the ground. The robot uses this sequence for turning: when the left foot is lifted from the ground, it is swung outside at a little angle; then the robot steps to load the weight on the foot, to bring it onto the ground. The ankle is then rotated back in its place and the whole robot turns left. You can repeat this routine as many times as needed to turn in place, and you can modify it slightly to turn in the other direction.

int[] playerSquare = new int[2]; // the coordinates of the player are given in terms of // the 16x16 dungeon grid. You divide the player's // pixel coordinates to get the right grid square. // If the player was not precisely aligned with a // grid square when the game was saved, the difference // will be shaved off. playerSquare[0] = myPrincess.getX()/SQUARE_WIDTH; playerSquare[1] = myPrincess.getY()/SQUARE_WIDTH; // save the coordinates of the current locations of // the keys, and if a key is currently held by the // player, we save the info of which one it was. int[][] keyCoords = new int[4][]; int heldKey = -1; for(int i = 0; i < myKeys.length; i++) { keyCoords[i] = new int[2]; keyCoords[i][0] = myKeys[i].getX()/SQUARE_WIDTH; keyCoords[i][1] = myKeys[i].getY()/SQUARE_WIDTH; if((myHeldKey != null) && (myKeys[i] == myHeldKey)) { heldKey = i; } } // save the information of which doors were open. int[] doorsOpen = new int[8]; for(int i = 0; i < myDoors.length; i++) { if(myDoors[i].isVisible()) { doorsOpen[i] = 1; } } // take all the information you've gathered and // create a GameInfo object that will save the info // in the device's memory. GameInfo info = new GameInfo(myCurrentBoardNum, gameTicks, playerSquare, keyCoords, doorsOpen, heldKey); } //------------------------------------------------------// graphics methods /** * paint the game graphic on the screen. */ public void paint(Graphics g) throws Exception { // only repaint if something has changed: if(myModifiedSinceLastPaint) { g.setColor(DungeonCanvas.WHITE); // paint the background white to cover old game objects

documentation or MSDN online (http://msdn.microsoft.com).

Using the ImageAttribute is easy. Just add the appropriate 16-by-16 bitmap to the solution within one of your projects, create a custom implementation of the ConfigurationNode class, and then mark up the custom ConfigurationNode class with the ImageAttribute. Listing 5-5 shows an example.

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. NET Barcode Scanner Library API for . NET Barcode Reading and ...
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