Once you’ve got this new Event set up, test your game. The complete set should look just like the image below. Step 72: Now we just need to take the above stack of blocks and insert it into the second Set X to for Self block in our conditionals. On the right side, we enter a value of 1 so our Ship gets replaced 1 pixel inside of the right edge of the screen. This time though, we put that stack of blocks inside the left side of the second Minus block. Remember that you can ALT-drag on our existing blocks to duplicate them you should do this to grab the entire stack out of the comparison.Īgain, we need the same math to subtract the width of the Ship from the width of the Screen. In this case, let's get the following blocks. This will prevent it from ever going off the left side of the screen.Īgain, like our second comparison for our condition, the second value requires a few more blocks to do what we want it to. Simply put, if our Ship is ever at 0 or less X position (further left than the left edge of the screen), we are going to force it back to 1 instead. We just need to put a 1 into the block so it reads Set X to 1 for Self. Step 71: Just like with the comparison for our condition, the first value is rather easy. Let's drag a couple out and put them where they belong. To do so, we need two of the Set X to for Self blocks one for each condition. Given that our goal is to keep the Ship on the screen, we want to reset the position of our Ship Actor so that it is back on-screen anytime these conditions are met. Since we now have those conditions set up, we can have something happen when they are true. Step 70: The goal of setting up these two conditions is to identify when the Ship has gone too far and has reached the edge of the screen. Here's a image of what we should have so far. Be sure to grab the Minus block to move them in, or we might only get one of the blocks inside of it instead. We need to drag this set of blocks into the other half of our second condition. The result will be a stack of blocks that looks like the below image. We then need to drag the Screen Width into the left side of the Minus block, and the Width of Self into the right side. Width of Self (found in Actor > Properties > Size).Screen Width (found in Scene > View > Screen Bounds).Minus (found in Numbers & Text > Math > Arithmetic).Let's get the following blocks and drop them side-by-side in the workspace. As previously noted, we have to account for the width of the actor on the right side. The second, Greater Than, comparison will be slightly more complex, however. All we have to do is type a 0 into the right half of the Less Than block. For our first comparison, we are just going to compare to 0 since an X value of zero is the left side of the screen. Step 69: Now that we have our first value to compare, we need a second value to compare it against. We can click on each one and change them easily with the drop-down menus that appear. We need one more change for these two blocks, we want them to say "x (on screen)" instead of just "x". We want to drag two of these blocks out one for each of our comparison blocks (the blocks). We need a block that tells us that, and we can find it under the Actor category, Position sub-category, Position section visible as x of Self. Step 68: As mentioned previously, one of the numbers we want to compare is the Ship's position. Put the Less Than (shaped like ) in the second, Otherwise If block's empty space. You can find them in the Flow category, Conditions sub-category, in the Equality section. Let's grab the Greater Than and the Less Than blocks from palette. Step 67: For our conditions, we need to compare two numbers the Ship's position and the left or right edge of the screen. Stencyl measures an Actor’s x position from the left-most edge of the graphic if we didn't account for the Ship's width, the right side of the ship could go further than the right side of the screen. Note that it will need to take into account the Ship’s width. The second will check if it’s past the right-most edge (a value equal to the screen’s width) of the screen. We will use the first to check if the Ship’s position on screen is beyond the left-most edge of the screen (an X position of 0). We need to add an If and an Otherwise If block inside. Step 66: Create a new When Updating Event for the Ship. Let's fix that, we need to restrict the Ship’s position so it can’t go past the screen’s edge. You probably played around with the game so far and noticed something the ship can go off the screen (and doesn't come back!).
Comments Crash Course 2: Invaders - Part 9
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