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Figure 116: New Game Dialog Box for the JaspersDots Program Listing 118: Paint and Click Event Handlers for the New Game Dialog Box
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private void Panel1_Click(object sender, EventArgs e) { if (sender == (object)panel1) iColor1 = 0; else if (sender == (object)panel2) iColor1 = 1; else if (sender == (object)panel3) iColor1 = 2; else if (sender == (object)panel4) iColor1 = 3; else if (sender == (object)panel5) iColor1 = 4; // Redraw the window Invalidate(); } private void Panel2_Click(object sender, EventArgs e) { if (sender == (object)panelA) iColor2 = 0; else if (sender == (object)panelB) iColor2 = 1; else if (sender == (object)panelC) iColor2 = 2;
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else if (sender == (object)panelD) iColor2 = 3; else if (sender == (object)panelE) iColor2 = 4; // Redraw the window Invalidate(); } private void GameNewDialog_Paint(object sender, PaintEventArgs e) { Panel panel = panel1; // // Player 1 // // What is the current player 1 panel switch(iColor1) { case 0: panel = panel1; break; case 1: panel = panel2; break; case 2: panel = panel3; break; case 3: panel = panel4; break; case 4: panel = panel5; break; } clr1 = panelBackColor; // Draw a rectangle around the color selected by player 1 Pen penBlack = new Pen(ColorBlack); Rectangle rc = new Rectangle(panelLeft - 3, panelTop - 3, panelWidth + 5, panelHeight + 5); eGraphicsDrawRectangle(penBlack, rc); rcInflate(1, 1); eGraphicsDrawRectangle(penBlack, rc); rcInflate(1, 1); eGraphicsDrawRectangle(penBlack, rc);
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// // Player 2 // // What is the current player 2 panel switch(iColor2) { case 0: panel = panelA; break; case 1: panel = panelB; break; case 2: panel = panelC; break; case 3: panel = panelD; break; case 4: panel = panelE; break; } clr2 = panelBackColor; // Draw a rectangle around the color selected by player 2 rc = new Rectangle(panelLeft - 3, panelTop - 3, panelWidth + 5, panelHeight + 5); eGraphicsDrawRectangle(penBlack, rc); rcInflate(1, 1); eGraphicsDrawRectangle(penBlack, rc); rcInflate(1, 1); eGraphicsDrawRectangle(penBlack, rc); }
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There is a bug in Visual Studio NET that affects C# programmers The bug is that supported events for certain controls do not appear in the Designer You can, however, add an event handler manually Inside the Visual Studio code editor, you type the control name, the event name, and the += operator, and IntelliSense helps by providing the rest In our JaspersDots game, we found that the Designer did not support the Click event for Panel controls To create Click event handlers for the Panel controls in the New Game dialog box, we manually typed in event handler names, which IntelliSense completed for us The resulting code appears in Listing 119
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Listing 119: Adding Event Handlers Manually
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// Set up the Click handler for player 1 panels // Note: The Designer does not support this // so we have to do it manually panel1Click += new EventHandler(thisPanel1_Click); panel2Click += new SystemEventHandler(thisPanel1_Click); panel3Click += new SystemEventHandler(thisPanel1_Click); panel4Click += new SystemEventHandler(thisPanel1_Click); panel5Click += new SystemEventHandler(thisPanel1_Click); // Set up the Click handler for player 2 panels // Note: The Designer does not support this // so we have to do it manually panelAClick += new EventHandler(thisPanel2_Click); panelBClick += new SystemEventHandler(thisPanel2_Click); panelCClick += new SystemEventHandler(thisPanel2_Click); panelDClick += new SystemEventHandler(thisPanel2_Click); panelEClick += new SystemEventHandler(thisPanel2_Click);
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Figure 117 shows an example of the JaspersDots game in play Each dot is drawn with a call to the FillEllipse method that is drawn in a bounding rectangle that is 4 pixels by 4 pixels Players draw lines by clicking in the area between dots, and when a hit is detected a line is drawn by calling the DrawLine method A player s claimed boxes are drawn with calls to the FillRectangle method
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Figure 117: JaspersDots with a Game under Way
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The JaspersDots program uses a custom control for the game window, our DotControl class Listing 1110 shows the source code to the DotControl class
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