It seems that I need to use GreenfootImage#setColorAt(...) with a transparent Color(0,0,0,0) in order to remove / erase pixels, instead of GreenfootImage#drawRect(...) after setting the image color to transparent. This surprised me and seems counter intuitive. Can someone offer an explanation, please? Thanks in advance.
Details
I have a simple actor that is a transparent window that is placed over other actor locations. It can have a border drawn on it to draw focus to that location. Then the border can be reset or cleared.
and then
but this doesn't appear to work. Instead I had to use this approach:
I would have expected the drawRect method to eventually call the setColor method....?
Thanks.
1 2 3 4 5 6 7 8 9 | public void drawBorder( Color c ) { GreenfootImage img = getImage(); int width = img.getWidth(); int height = img.getHeight(); img.setColor( c ); for( int i=0; i<BORDER_WIDTH; i++ ) { img.drawRect(i, i, width-(2*i+1), height-(2*i+1) ); }} |
1 2 3 | public void clearBorder() { drawBorder( new Color( 0, 0, 0, 0 ) );} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | public void erase() { GreenfootImage img = getImage(); Color color = new Color( 0,0,0,0 ); img.setColor( color ); for( int r=0; r<img.getWidth(); r++ ) for(int c=0; c<img.getHeight(); c++ ) if( r < BORDER_WIDTH || r > img.getHeight() - BORDER_WIDTH - 1 || c < BORDER_WIDTH || c > img.getWidth() - BORDER_WIDTH - 1 ) img.setColorAt(r, c, color); } |
