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 QuickSCREEN Details Example Contents Index |
| ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ |
| DRAW Statement Details |
|
| Syntax |
| DRAW stringexpression |
| |
| The DRAW statement combines many of the capabilities of the other |
| graphics statements into a graphics macro language. This macro language |
| defines a set of characteristics that can be used to describe an image. |
| These characteristics include motion (up, down, left, right), color, |
| rotation angle, and scale factor. The stringexpression consists of these |
| macro commands. |
| |
| There are three types of macro commands: |
| |
| cursor-movement commands |
| angle, color, and scale factor commands |
| X, the substring command |
| |
| Differences from BASICA |
| |
| The DRAW statement requires modification of BASICA programs when used |
| with QuickBASIC. Specifically, the compiler requires the VARPTR$ form |
| for variables. Statements such as the following: |
| |
| DRAW "XA$" |
| DRAW "TA = ANGLE" |
| |
| (where A$ and ANGLE are variables) must be changed as follows: |
| |
| DRAW "X" + VARPTR$(A$) |
| DRAW "TA =" + VARPTR$(ANGLE) |
| |
| when using the compiler. |
| |
| The compiler does not support the Xstringexpression command. However, |
| you may execute a substring by appending the character form of the |
| address to X. For example, the following two statements are |
| equivalent. The first statement works when within the environment |
| and when using the compiler, while the second works only within the |
| environment. |
| |
| DRAW "X" + VARPTR$(A$) |
| DRAW "XA$" |
