Click Ball - Goodheart-Willcox

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Save the Game Create an Object 24. Click the OK button in the Sprite Properties dialog box to finish creating the sprite. The sprite is added to the resource tree in the Sprites branch (folder). 25. Using similar steps, create a wall sprite named SPR_Wall using the wall_block.png image file located in the Maze-Platform folder. 26. Save your game build before continuing (File>Save or the Save the Game button on the toolbar). Adding and Naming Objects You now have two sprites. They are listed in the resource tree in the Sprites branch. However, sprites cannot be placed in the room, only objects. You now need to create objects, have these objects “wear” the sprites, and then place the objects in the room (scene). 27. Click the Create an Object button on the toolbar. The Object Properties dialog box is displayed, Figure 3-5. 28. In the Name: text box, type OBJ_Ball. 29. Look at the Sprite area, which currently states to indicate no sprite has been assigned to the object. Click the selection button to the right of the display. A list of available sprites is displayed. 30. Choose the SPR_Ball sprite from the list. 31. Check the Visible check box so that the ball object can be seen in the game. Note: do not check the Solid check box to make the ball a solid object. Instead, moving objects need to be programmed to act solid. Game Maker does not work as well when moving objects are made solid. The objects may get stuck inside another solid object. Avoid making moving objects solid in your game builds, but objects that will not move can be set to solid. Sprite assigned to object Check to make the object visible Figure 3-5 Name the object Do not check Click to select a sprite 30 Introduction to Video Game Design Copyright by The Goodheart-Willcox Co., Inc. Copyright by The Goodheart-Willcox Co., Inc. Name: __________________________________________ 32. Click the Show Information button. The Information about: dialog box is displayed. This dialog box shows the scripting for the object. When changes are made in the Object Properties dialog box, Game Maker automatically builds the scripting so you do not have to. Close the Information about: dialog box. 33. Leave all other options in the Object Properties dialog box at the default settings, and click the OK button to finish creating the object. 34. The OBJ_Ball object is added to the resource tree in the Objects branch (folder). 35. Using similar steps, create a wall object named OBJ_Wall using the SPR_Wall sprite. Check both the Visible and Solid check boxes. Since this object will not move, it is okay to make the object solid. 36. Save your work. Adding Objects to the Room Now, you have created two sprites and two objects. You have also assigned the sprites to the objects. However, you have not yet placed the objects in a room (scene). Remember, earlier you created a room named room0. You will use this room to build the game. 37. In the resource tree, expand the Rooms branch and double-click room0 to open the room for editing. 38. Click the Windows maximize button in the top-right corner of the Room Properties window to maximize the room display. 39. Click the Objects tab in the Room Properties dialog box (which is now maximized). At the bottom of the tab are some helpful directions, as shown in Figure 3-6. 40. Click the selection button to display a list of objects and choose the OBJ_Ball object. 41. Left-click anywhere in the room to place an instance of the ball object. Notice that the object snaps to a position that is aligned to the top-left corner of the grid. 42. Left-click anywhere in the room to place another instance of the ball. 43. Right-click on each ball object to delete both of them. 44. Hold down the [Alt] key on the keyboard and left-click anywhere in the room. An instance of the object is placed in the room, but it does not snap to the grid lines. 45. Hold down the [Ctrl] key and left-click the ball object you just added. Drag the ball so it is located in the center of the room and then release the mouse button. Notice as you drag the object, it snaps to the grid. If you hold down the [Ctrl] and [Alt] keys, you can drag the object without it snapping to the grid. Figure 3-6 Object to be inserted Click to select a different object Coordinates of cursor Lesson 3 Click Ball 31
46. Change the object to be inserted to the OBJ_Wall object. 47. Move the cursor to the top right-corner of the room. 48. Hold down the [Shift] key, then click the left mouse button and drag along the top of the room to add a series of OBJ_Wall objects to create a wall. Notice that the wall bricks automatically snap to the grid, which results in gaps in the wall. 49. Click the right mouse button and drag across the wall object to erase them. 50. Change the grid size to 32 × 32. The sprite assigned to the OBJ_Wall object is 32 × 32 pixels, so the grid now matches the size of the object. 51. Holding down the [Shift] key, drag to create a row of OBJ_Wall objects along the top of the room. There should be no gaps in the wall now. 52. In a similar manner, create a wall all the way around the room. See Figure 3-7. 53. Close the room by clicking the Windows close button (the X). When prompted to save the room, click the Yes button. 54. Save your work. Figure 3-7 OBJ_Wall objects added to create a wall around the room 32 Introduction to Video Game Design Copyright by The Goodheart-Willcox Co., Inc. Copyright by The Goodheart-Willcox Co., Inc. Name: __________________________________________ Programming Conditions and Events Remember, Game Maker uses events and actions to create the interactions needed in a game. Your game does not yet have any programming, only scene design. The first programming is to create an event for the ball to move in a random direction. Random actions and chance allow for games to be unpredictable and more fun when they are replayed. 55. In the resource tree, double-click on the OBJ_Ball leaf to open the Object Properties dialog box. Notice the Events: and Actions: columns. These columns are used for programming. 56. Click the Add Event button at the bottom of the Events: column. The Choose an Event to Add dialog box is displayed. 57. Click the Create button in the Choose the Event to Add dialog box. An event is added that translates to: IF the OBJ_Ball object is created, THEN perform all actions displayed in the Actions: column. Right now, the Actions: column is blank, so you need to add something cool for the ball to do when the game begins. The first action will be to make the ball object move. 58. Click the Move tab on the right side of the Object Properties dialog box, Figure 3-8. 59. Hover the cursor over each button on the first row to find the Move Fixed button. Drag this button and drop it onto the blank section of the Actions: column. The Move Fixed dialog box is displayed and the Start moving in a direction entry appears in the Action: column. 60. In the Move Fixed dialog box, click the Self radio button in the Applies to area, Figure 3-9. Since you are modifying the properties of the OBJ_Ball object, this means that the selected movement will apply to that object (self). Figure 3-8 Drag the Move Fixed button into the Actions: column Click the Move tab Lesson 3 Click Ball 33 Move Fixed
Page 1 and 2: This sample chapter is for review p
Page 3: Toggle the Showing of the Grid Turn
Page 7 and 8: Set Score Figure 3-10 Select to app
Page 9 and 10: Room for Expansion You have reached
Page 11 and 12: Draw Text Click to select the font,
Page 13 and 14: STEM Review Questions and Activitie

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