Apple MA434Z/A User Manual - Page 921
Setting Slider Ranges, To set the slider range
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bgRed, bgGreen, bgBlue, 0, 0 ); Select1 = Select(keepAspect, Resize1, SetBGColor1, 0, 0); return Select1; } The ui file looks like this: nuiPushMenu("Tools"); nuiPushToolBox("Transform"); nuiToolBoxItem("@VidResize",VidResize()); nuiPopToolBox(); nuiPopMenu(); The only tricky portions in the macro so far are the Select function, and the logic to choose the height. When the branch of Select equals 1, the first image input is passed through. When it equals 2, the second branch is fed through. The keepAspect parameter is connected to Select to choose the branch you want. The other tricky portion is the height logic, the first line of the macro body. It declares an internal variable (it cannot be seen outside the macro) named yRes. It tests vidFormat to see if it equals 0. If so, it sets yRes to equal 486, the height of an NTSC image. Otherwise, it sets yRes to 576, the standard PAL image height. Setting Slider Ranges The first inconvenience about the macro, when used in the interface, is that the keepAspect slider goes from 0 to 1. The values you want are 1 or 2. Since you do not want to have to manually enter the format, it is easier to set the slider range from 1 to 2. This is done in the ui file VidResizeUI.h. To find the format, see "Using Parameters Controls Within Macros" on page 379. If you are reading this document electronically, you can copy and paste the command from the document into the text file. To set the slider range: 1 Load the ui/VidResizeUI.h file into the text editor. 2 Add the nuiDefSlider function to set a slider range: nuiPushMenu("Tools"); nuiPushToolBox("Transform"); nuiToolBoxItem("@VidResize",VidResize()); nuiPopToolBox(); nuiPopMenu(); nuiDefSlider("VidResize.keepAspect", 1, 2); The word "VidResize" of VidResize.keepAspect indicates that you only want to modify the keepAspect slider in the VidResize function. If you do not specify this, for example, you just have nuiDefSlider("keepAspect", 1, 2); and it tries to apply that slider range to all parameters named keepAspect, no matter what function they are in. 3 Save VidResizeUI.h and start Shake again. 4 Create the VidResize node (there is no need to test it on an image). Chapter 30 Installing and Creating Macros 921
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