function DrawPieChart($cx, $cy, $r, $angle1 = 0, $angle2 = 0, $fill = 'red', $fill_opacity = 1, $stroke = 'black', $strokewidth = 0)
{
list($x1, $y1) = polarToCartesian($cx, $cy, $r, $angle1);
list($x2, $y2) = polarToCartesian($cx, $cy, $r, $angle2);
if ($angle2 - $angle1 >= 360) {
$long_arc_flag = 1;
} else {
$long_arc_flag = $angle2 - $angle1 > 180 ? 1 : 0;
}
$svg = '<path d="M' . $cx . ',' . $cy . ' L' . $x1 . ',' . $y1 . ' A' . $r . ',' . $r . ' 0 ' . $long_arc_flag . ',0 ' . $x2 . ',' . $y2 . ' z" fill="' . $fill . '" fill-opacity="' . $fill_opacity . '" stroke-width="' . $strokewidth . '"/>';
return $svg;
}
function DrawAngle($angle_deg, $showdegrees = FALSE)
{
// $angle_deg = 200;
$width = 400;
$height = 260;
$stroke_width = 1;
$color1 = '#F2F2F2';
$color2 = 'black';
$centerx = $width / 2;
$centery = $height / 2;
$radius1 = 100;
$radius2 = 40;
$svg = '<div class="img-question text-center">
<svg width="' . $width . '" height="' . $height . '">
<circle cx="' . $centerx . '" cy="' . $centery . '" r="' . $radius1 . '" fill="' . $color1 . '" />
<line x1="' . $centerx . '" y1="' . $centery . '" x2="' . strval($centerx + $radius1) . '" y2="' . $centery . '" stroke="' . $color2 . '" stroke-width="' . $stroke_width . '" />';
if ($angle_deg == 360) {
$svg .= '<circle cx="' . $centerx . '" cy="' . $centery . '" r="' . $radius2 . '" stroke="black" fill="none" />';
} elseif ($angle_deg <= 360) {
list($x1, $y1) = polarToCartesian($centerx, $centery, $radius1, $angle_deg);
list($x2, $y2) = polarToCartesian($centerx, $centery, $radius2, $angle_deg);
$large_arc_flag = $angle_deg <= 180 ? 0 : 1;
$svg .= '<path stroke="black" fill="none" d="M' . strval($centerx + $radius2) . ',' . $centery . ' A' . $radius2 . ',' . $radius2 . ' 0 ' . $large_arc_flag . ',0 ' . $x2 . ',' . $y2 . '" />
<line x1="' . $centerx . '" y1="' . $centery . '" x2="' . $x1 . '" y2="' . $y1 . '" stroke="' . $color2 . '" stroke-width="' . $stroke_width . '" />';
} else {
$angle = 0;
$radius = 30;
while ($angle < $angle_deg) {
list($x1, $y1) = polarToCartesian($centerx, $centery, $radius, $angle);
list($x2, $y2) = polarToCartesian($centerx, $centery, $radius + 0.1, min($angle_deg, $angle + 5));
$svg .= '<path stroke="black" fill="none" d="M' . $x1 . ',' . $y1 . ' A' . $radius . ',' . strval($radius + 0.5) . ' 0 0,0 ' . $x2 . ',' . $y2 . '" />';
$angle += 5;
$radius += 0.1;
}
list($x1, $y1) = polarToCartesian($centerx, $centery, $radius1, $angle_deg);
$svg .= '<line x1="' . $centerx . '" y1="' . $centery . '" x2="' . $x1 . '" y2="' . $y1 . '" stroke="' . $color2 . '" stroke-width="' . $stroke_width . '" />';
}
if ($showdegrees) {
$svg .= '<text font-size="15" fill="black" x="' . strval($centerx + $radius1 + 18) . '" y="' . strval($centery + 7) . '">$0°$</text>';
$svg .= '<text font-size="15" fill="black" x="' . strval($centerx + 5) . '" y="' . strval($centery - $radius1 - 7) . '">$90°$</text>';
$svg .= '<text font-size="15" fill="black" x="' . strval($centerx - $radius1 - 25) . '" y="' . strval($centery + 7) . '">$180°$</text>';
$svg .= '<text font-size="15" fill="black" x="' . strval($centerx + 5) . '" y="' . strval($centery + $radius1 + 22) . '">$270°$</text>';
}
$svg .= '</svg></div>';
return $svg;
}
function PieChart($angle_deg = NULL)
{
$width = 400;
$height = 260;
$cx = $width / 2;
$cy = $height / 2;
$r = 100;
$svg = '<div class="img-question text-center">
<svg width="' . $width . '" height="' . $height . '">';
// Show angle
if ($angle_deg) {
if ($angle_deg == 360) {
$svg .= DrawCircle($cx, $cy, $r, $stroke = 'black', $strokewidth = 0, $fill = '#CCC');
} else {
$svg .= DrawPieChart($cx, $cy, $r, 0, $angle_deg, $fill = '#CCC');
}
list($x1, $y1) = polarToCartesian($cx, $cy, $r, 0);
list($x2, $y2) = polarToCartesian($cx, $cy, $r, $angle_deg);
$svg .= DrawLine($cx, $cy, $x1, $y1);
$svg .= DrawLine($cx, $cy, $x2, $y2);
}
// Circle
$svg .= DrawCircle($cx, $cy, $r);
// Ticks for every 10°
for ($i = 0; $i < 36; $i++) {
$angle = $i * 10;
list($x1, $y1) = polarToCartesian($cx, $cy, $r + 5, $angle);
list($x2, $y2) = polarToCartesian($cx, $cy, $r - 5, $angle);
$svg .= DrawLine($x1, $y1, $x2, $y2);
}
// Show hint degrees
$svg .= DrawText($cx + $r + 10, $cy + 7, '0°', 15);
$svg .= DrawText($cx + $r + 5, $cy - 13, '10°', 15);
$svg .= DrawText($cx - 8, $cy - $r - 7, '90°', 15);
$svg .= DrawText($cx - $r - 40, $cy + 7, '180°', 15);
$svg .= DrawText($cx - 15, $cy + $r + 22, '270°', 15);
$svg .= '</svg></div>';
return $svg;
}
function DrawEdges($centerX, $centerY, $radius, $angle0, $degrees, $i, $color)
{
$points = count($degrees);
$svg = '';
$prev_degrees = 0;
$zeros = 0;
list($x1, $y1) = polarToCartesian($centerX, $centerY, $radius, $angle0);
// calculate nodes with zero edges
for ($j = 0; $j < $i; $j++) {
$zeros += $degrees[$j] == 0 ? 1 : 0;
}
// calculate previous degrees
for ($j = 0; $j < $i; $j++) {
$prev_degrees += $degrees[$j] == count($degrees) - $zeros - 1 ? 1 : 0;
}
if ($i < count($degrees) - 1) {
for ($j = 1; $j <= $degrees[$i] - $prev_degrees; $j++) {
$angle = $angle0 + $j * 360 / $points;
list($x2, $y2) = polarToCartesian($centerX, $centerY, $radius, $angle);
$svg .= $this->DrawEdge($x1, $y1, $x2, $y2, $color);
}
}
return $svg;
}
function Graph($graph, $step = NULL)
{
$width = 400;
$height = 300;
$centerX = $width / 2;
$centerY = $height / 2;
$radius = 100;
$svg = '<div class="img-question text-center">
<svg width="' . $width . '" height="' . $height . '">';
// $svg .= '<rect width="'.$width.'" height="'.$height.'" fill="black" fill-opacity="0.2" />';
$size = count($graph);
$angle0 = $size == 4 ? 45 : 90;
// Edges
for ($node1 = 0; $node1 < $size; $node1++) {
if ($node1 < $step) {
$color = $node1 == $step - 1 ? '#B155CF' : 'black';
foreach ($graph[$node1] as $node2) {
if (!is_array($node2)) {
$angle1 = $angle0 + $node1 * 360 / $size;
$angle2 = $angle0 + $node2 * 360 / $size;
list($x1, $y1) = polarToCartesian($centerX, $centerY, $radius, $angle1);
list($x2, $y2) = polarToCartesian($centerX, $centerY, $radius, $angle2);
$svg .= DrawLine($x1, $y1, $x2, $y2, $color, 2);
}
}
}
}
// Nodes
for ($node = 0; $node < $size; $node++) {
$angle = $angle0 + $node * 360 / $size;
if ($node < $step - 1) {
$color = '#A1D490';
} elseif ($node == $step - 1) {
$color = '#B155CF';
} else {
$color = 'white';
}
list($x, $y) = polarToCartesian($centerX, $centerY, $radius, $angle);
$svg .= DrawCircle($x, $y, 10, 'black', $width = 2, $color);
}
$svg .= '</svg></div>';
return $svg;
}