| << Chapter < Page | Chapter >> Page > |
Set the pixels to create a border
The code in Listing 12 uses a for loop and the setPixel32 method to set the pixel color to fully opaque magenta (red plus blue) for the first two pixels in each row of pixels and to set the pixel color to fully opaque cyan (green plus blue) for the last two pixels in each row. This produces a magenta border with a thickness of twopixels on the left edge of the middle image in Figure 1 and produces a cyan border with a thickness of two pixels on the right edge of the middle image inFigure 1.
Put borders on the top and bottom edges
Listing 13 uses similar code to put a cyan border along the top edge and a magenta border along the bottom edge of the middle image in Figure 1.
for(var col:uint = 0;col<bitmapData.width;
col++){bitmapData.setPixel32(col,0,0xFF00FFFF);
bitmapData.setPixel32(col,1,0xFF00FFFF);bitmapData.setPixel32(col,bitmapData.height - 1,
0xFFFF00FF);bitmapData.setPixel32(col,bitmapData.height - 2,
0xFFFF00FF);} //End for loop} //end modify method The end of the modify method
Listing 13 also signals the end of the modify method. When the method returns from the call that was made in Listing 7, the pixels in thered and green rectangular region near the upper-left corner of the middle image of Figure 1 have been modified relative to the original image shown in the topimage in Figure 1. In addition, the pixels along all four edges of the middle image have been replaced by magenta and cyan pixels to produce a border with athickness of two pixels.
Return to the complete event handler
Returning now to where we left off in the complete event handler in Listing 7, the code in Listing 14:
//Clone the original bitmap to create another
// duplicate.var duplicateC:Bitmap = new Bitmap(
original.bitmapData.clone());//Place the duplicateC below the other two in the
// VBox.duplicateC.x = 5;
duplicateC.y = 2*original.height;var imageC:Image = new Image();imageC.addChild(duplicateC);
this.addChild(imageC);//Modify the pixels as above to add some color to// the image.
modify(duplicateC);//Now invert the colors in the top half of this
// bitmap. Note that the magenta and green colors// swap positions.
invert(duplicateC);} //end completeHandler Color inversion
The color inversion algorithm is
Usually the new color is readily distinguishable from the old color.
Notification Switch
Would you like to follow the 'Object-oriented programming (oop) with actionscript' conversation and receive update notifications?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|