(VIII) Collisions and strings: dim as string & draw string

G'day everybody!

In this entry we will see the collisions, and we will use a concret one wich is the perfect superposition between two elements, as it used for pac-man and the ghosts.
We have a perfect superposition when te coordinates of two elements are the same, same value for x axis and same value for y axis.

Take a look at the new code of the day:

Let me explain the new keywords used:

dim as string to declare a new variable that will contain an string, an string is delimited with an initial " and a final ".
draw string to draw a string on the screen at the point indicated. The sintaxis is draw string (x,y),string in our case draw string (0,h/2),message

When we execute this code we can move the white square toward the other ones and the message in the screen will remember the color with which square the last collision occurs.

Today's code and concepts are very important because we have an square with controlled interaction of its environment, here we have static squares to collide with but could be enemies both static or moving, solids like floor, walls, stairways, objects like power-ups, weapons, etc. and all this things working the same way. In this point begins to work your imagination to use all this powerfull knowledge.

This is enough by now, in the next entry we will talk about the colors.

Contact me for any question and tell me your feedback, see you!

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(II) Download & setup FreeBASIC's IDE FBIde

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Hey everybody! Take a look at the code of the day: The result of execute our new code will be the same as the obtained with the code of the last entry but you must press Esc key to exit: An screen to play with 400 pixels of width and 300 pixels of height and four squares of 32x32 pixels one in each corner. The white square is painted or filled with same color. The screen is being draw again and again and again until you press Esc key. Let me explain the new keywords used: dim as boolean as const as but with dim we are telling that the label (in our case finish and kescape) will have a variable value. In the case of boolean this value can be false or true. do loop until to make a loop that will repeat the code inside the instruction until the condition after until is resolve to true. if then else to execute the code inside the instruction if the condition is resolve to true, else to execute an alternate code if the condition is not resolve to true. multikey t

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How everybody! In this entry we will see how to write in the screen, to know for exemple how to show things like information or our score. Take a look at this code: We have already seen drwa string but l et me explain the new keyword used: locate to drive the cursor used by print to the desired position in the screen. print to print a value in the screen. When we execute this code we can see this: locate and print works together and understand the screen like tiles of 8x8 pixels where there's only place for a character (1,2,3,...,a,b,c,d,e,...,!"·$%&/..., etc) in each tile, starting at 1,1 position whre the fist number is the value of the row and the second value the column that's why the second message appears at the second row and starts at the fist column. The colors used are the default (black/white) or the one's selected by the color instruction that we talk about in the past entry. This is e nough by now, i

Learning FreeBASIC through videogames

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