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imagerectangle — Zeichnet ein Rechteck
ImageRectangle() erzeugt ein Rechteck mit der Linienfarbe col, beginnend bei der oberen linken Koordinate X1 und Y1. Das Ende liegt bei der unteren rechten Koordinate X2 und Y2. Dabei ist 0, 0 die linke obere Ecke des Bildes im.
In addition to Corey's note, this is the kind of code he means. Note that I always draw an outer grid border, so drawing lines will always take
1 + ceil((rows+cols)/2) actions. For a 20X20 grid, this means 21 actions, a 10X25 grid takes 19 Actions
<?php
function draw_grid(&$img, $x0, $y0, $width, $height, $cols, $rows, $color) {
//draw outer border
imagerectangle($img, $x0, $y0, $x0+$width*$cols, $y0+$height*$rows, $color);
//first draw horizontal
$x1 = $x0;
$x2 = $x0 + $cols*$width;
for ($n=0; $n<ceil($rows/2); $n++) {
$y1 = $y0 + 2*$n*$height;
$y2 = $y0 + (2*$n+1)*$height;
imagerectangle($img, $x1,$y1,$x2,$y2, $color);
}
//then draw vertical
$y1 = $y0;
$y2 = $y0 + $rows*$height;
for ($n=0; $n<ceil($cols/2); $n++) {
$x1 = $x0 + 2*$n*$width;
$x2 = $x0 + (2*$n+1)*$width;
imagerectangle($img, $x1,$y1,$x2,$y2, $color);
}
}
//example
$img = imagecreatetruecolor(300, 200);
$red = imagecolorallocate($img, 255, 0, 0);
draw_grid($img, 0,0,15,20,20,10,$red);
header("Content-type: image/png");
imagepng($img);
imagedestroy($img);
?>
have fun ;)
Matt,
I agree that drawing 100 boxes for a 10x10 square is ludicrous. However, if we're going to talk about the best way to draw it in GD, you're still off.
Since a rectangle will draw two vertical lines in one draw, we should use it to our advantage. You can draw 5 rectangles that have the tops and bottoms outside of the image, and there you have your ten rows. Draw 5 more who's sides are out of the image and you have your columns. We just drew a 10x10 (you could do 11x11) grid in 10 draw operations.
:)
<?php
// With this function you will draw rounded corners rectangles with transparent colors.
// Empty (not filled) figures are allowed too!!
function draw_roundrectangle($img, $x1, $y1, $x2, $y2, $radius, $color,$filled=1) {
if ($filled==1){
imagefilledrectangle($img, $x1+$radius, $y1, $x2-$radius, $y2, $color);
imagefilledrectangle($img, $x1, $y1+$radius, $x1+$radius-1, $y2-$radius, $color);
imagefilledrectangle($img, $x2-$radius+1, $y1+$radius, $x2, $y2-$radius, $color);
imagefilledarc($img,$x1+$radius, $y1+$radius, $radius*2, $radius*2, 180 , 270, $color, IMG_ARC_PIE);
imagefilledarc($img,$x2-$radius, $y1+$radius, $radius*2, $radius*2, 270 , 360, $color, IMG_ARC_PIE);
imagefilledarc($img,$x1+$radius, $y2-$radius, $radius*2, $radius*2, 90 , 180, $color, IMG_ARC_PIE);
imagefilledarc($img,$x2-$radius, $y2-$radius, $radius*2, $radius*2, 360 , 90, $color, IMG_ARC_PIE);
}else{
imageline($img, $x1+$radius, $y1, $x2-$radius, $y1, $color);
imageline($img, $x1+$radius, $y2, $x2-$radius, $y2, $color);
imageline($img, $x1, $y1+$radius, $x1, $y2-$radius, $color);
imageline($img, $x2, $y1+$radius, $x2, $y2-$radius, $color);
imagearc($img,$x1+$radius, $y1+$radius, $radius*2, $radius*2, 180 , 270, $color);
imagearc($img,$x2-$radius, $y1+$radius, $radius*2, $radius*2, 270 , 360, $color);
imagearc($img,$x1+$radius, $y2-$radius, $radius*2, $radius*2, 90 , 180, $color);
imagearc($img,$x2-$radius, $y2-$radius, $radius*2, $radius*2, 360 , 90, $color);
}
}
?>
More functions at http://www.sphoera.com
Oh I don't know. He was on the right track..
<?php
$rows = 5;
$cols = 11;
$eachx = 12;
$eachy = 18;
$max = array($cols*$eachx, $rows*$eachy);
$im = imagecreatetruecolor($max[0]+1,$max[1]+1);
$white = imagecolorallocate($im,255,255,255);
imagefill($im,0,0,$white);
$black = imagecolorallocate($im,50,50,50);
for($x=$max[0]/2;$x>=0;$x-=$eachx) {
imagerectangle($im, ($max[0]/2)+$x,0, ($max[0]/2)-$x,$max[1], $black);
}
for($y=$max[1]/2;$y>=0;$y-=$eachy) {
imagerectangle($im, 0,($max[1]/2)+$y, $max[0],($max[1]/2)-$y, $black);
}
header("Content-type: image/jpeg");
imagejpeg($im,'',80);
imagedestroy($im);
?>
Lets not do it Mr Benson's way OK!
I'm sure if I had to draw a 10x10 grid on paper I wouldn't do it by drawing 100 individual squares, redrawing nearly half of the lines twice.
I'd probably do it by drawing 11 vertical lines and 11 horizontal lines.
function ImageGrid2(&$im,$startx,$starty,$width,$height,$xcols,$yrows,&$color) {
$endy = $starty + $height * $yrows;
for ( $x=0; $x <= $xcols; $x++ ) {
$x1 = $startx + $width * $x;
imageline ( $im, $x1, $starty, $x1, $endy, $color );
}
$endx = $startx + $width * $xcols;
for ( $y=0; $y <= $yrows; $y++ ) {
$y1 = $starty + $height * $y;
imageline ( $im, $startx, $y1, $endx, $y1, $color );
}
}
If you want an empty rectangle, I mean, just the borders, fill it first with the ImageFilledRectangle function with the background color and then draw it with this function.
For those wanting a function to draw a grid I've created one. I hope this is the right place to post it.
<?php
function ImageGrid(&$im,$startx,$starty,$width,$height,$xcols,$yrows,&$color) {
for ( $x=0; $x < $xcols; $x++ ) {
for ( $y=0; $y < $yrows; $y++ ) {
$x1 = $startx + ($width * $x);
$x2 = $startx + ($width * ($x+1));
$y1 = $starty + ($height * $y);
$y2 = $starty + ($height * ($y+1));
ImageRectangle($im, $x1, $y1, $x2, $y2, $color);
}
}
} // end function ImageGrid
?>
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