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Now you need to repeat the same process to add the design-time provider node for SubtractProvider. Name it SubtractMath. And that completes the creation of the new application block.

CHAPTER 8 JOHNNXT IS ALIVE!

Now with everything built, it is time to use your new application block. Create a new Windows application with two text boxes, a label, and a button. Label the button DoMath. Then add the code for the click event of the DoMath button, as shown in Listing 14-6. Listing 14-6. DoMath Click Event using using using using using using using using System; System.Collections.Generic; System.ComponentModel; System.Data; System.Drawing; System.Text; System.Windows.Forms; SampleAB;

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myScore = 0; myGameOver = false; myGameTicks = myInitialGameTicks; myOldGameTicks = myInitialGameTicks; repaint(); } /** * clears the key states. */ void flushKeys() { getKeyStates(); } /** * This version of the game does not deal with what happens * when the game is hidden, so I hope it won't be hidden... * see the version in the next chapter for how to implement * hideNotify and showNotify. */ protected void hideNotify() { } /** * This version of the game does not deal with what happens * when the game is hidden, so I hope it won't be hidden... * see the version in the next chapter for how to implement * hideNotify and showNotify. */ protected void showNotify() { } //------------------------------------------------------// graphics methods /** * paint the game graphic on the screen. */ public void paint(Graphics g) { // clear the screen: g.setColor(WHITE); g.fillRect(CORNER_X, CORNER_Y, DISP_WIDTH, DISP_HEIGHT); // color the grass green g.setColor(0, 255, 0); g.fillRect(CORNER_X, CORNER_Y + DISP_HEIGHT - GROUND_HEIGHT, DISP_WIDTH, DISP_HEIGHT); // paint the layer manager:

namespace SampleABTestHarness { public partial class TestForm : Form { public TestForm() { InitializeComponent(); } private void m_DoMathButton_Click(object sender, EventArgs e) { ISampleProvider math = SampleProviderFactory.CreateSampleProvider(); int result = math.DoMath(Convert.ToInt32(m_XTextBox.Text, 10), Convert.ToInt32(m_YTextBox.Text, 10)); m_ResultLabel.Text = result.ToString(); } } } The next step is to configure the application configuration file. Add SampleAB to the configuration file, and finally select AddProvider as the default.

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try { myManager.paint(g); } catch(Exception e) { myJump.errorMsg(e); } // draw the time and score g.setColor(BLACK); g.setFont(FONT); g.drawString("Score: " + myScore, (DISP_WIDTH - SCORE_WIDTH)/2, DISP_HEIGHT + 5 - GROUND_HEIGHT, g.TOP|g.LEFT); g.drawString("Time: " + formatTime(), (DISP_WIDTH - TIME_WIDTH)/2, CORNER_Y + FONT_HEIGHT, g.TOP|g.LEFT); // write game over if the game is over if(myGameOver) { myJump.setNewCommand(); // clear the top region: g.setColor(WHITE); g.fillRect(CORNER_X, CORNER_Y, DISP_WIDTH, FONT_HEIGHT*2 + 1); int goWidth = FONT.stringWidth("Game Over"); g.setColor(BLACK); g.setFont(FONT); g.drawString("Game Over", (DISP_WIDTH - goWidth)/2, CORNER_Y + FONT_HEIGHT, g.TOP|g.LEFT); } } /** * a simple utility to make the number of ticks look like a time... */ public String formatTime() { if((myGameTicks / 16) + 1 != myOldGameTicks) { myTimeString = ""; myOldGameTicks = (myGameTicks / 16) + 1; int smallPart = myOldGameTicks % 60; int bigPart = myOldGameTicks / 60; myTimeString += bigPart + ":"; if(smallPart / 10 < 1) { myTimeString += "0"; } myTimeString += smallPart; } return(myTimeString); } //-------------------------------------------------------

Note The completed application block and sample application shown in this chapter can be downloaded

CHAPTER 8 JOHNNXT IS ALIVE!

from the Source Code/Download section of the Apress website (http://www.apress.com).

/** * Tell the layer manager to advance the layers and then * update the display. */ void advance() { myGameTicks--; myScore += myManager.advance(myGameTicks); if(myGameTicks == 0) { setGameOver(); } // paint the display try { paint(getGraphics()); flushGraphics(); } catch(Exception e) { myJump.errorMsg(e); } } /** * Respond to keystrokes. */ public void checkKeys() { if(! myGameOver) { int keyState = getKeyStates(); if((keyState & LEFT_PRESSED) != 0) { myManager.setLeft(true); } if((keyState & RIGHT_PRESSED) != 0) { myManager.setLeft(false); } if((keyState & UP_PRESSED) != 0) { myManager.jump(); } } } }

Summary

CHAPTER 8 JOHNNXT IS ALIVE!

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