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<?php |
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namespace Nielsiano\DmplBuilder; |
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use Exception; |
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/** |
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* Illustrate a plot program visually as an SVG line drawing. |
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*/ |
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class SvgBuilder implements PlotBuilder |
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{ |
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/** |
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* Current position. |
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*/ |
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protected $x = 0; |
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protected $y = 0; |
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/** |
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* Extent of drawing |
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*/ |
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protected $maxX = 0; |
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protected $maxY = 0; |
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protected $instructions = []; |
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protected $axesFlipped = false; |
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protected $penIsDown = true; |
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protected $tool = 'regular'; |
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protected $unit = 'mm'; |
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protected $scale = 0.1; |
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const TOOLS = [ |
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0 => 'regular', |
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6 => 'flex', |
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]; |
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/** |
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* Adds a new plot of x and y to machine instructions. |
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*/ |
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public function plot(int $x, int $y): PlotBuilder |
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{ |
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if ($this->axesFlipped) { |
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list($x, $y) = [$y, $x]; |
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} |
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$targetX = $this->x + $x; |
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$targetY = $this->y + $y; |
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$this->maxX = max($this->maxX, $targetX); |
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$this->maxY = max($this->maxY, $targetY); |
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if ($this->penIsDown) { |
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$this->pushInstruction('line', [ |
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'x1' => $this->x, |
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'y1' => $this->y, |
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'x2' => $targetX, |
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'y2' => $targetY, |
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'class' => $this->tool |
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]); |
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} |
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$this->x = $targetX; |
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$this->y = $targetY; |
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return $this; |
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} |
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/** |
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* Changes the pen of the plotter. |
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*/ |
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public function changePen(int $pen): PlotBuilder |
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{ |
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$this->tool = self::TOOLS[$pen]; |
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return $this; |
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} |
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/** |
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* Compiles a string in target format with machine instructions. |
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*/ |
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public function compile(): string |
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{ |
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$instructions = implode("\n", $this->instructions); |
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$width = ($this->maxX * $this->scale) . $this->unit; |
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$height = ($this->maxY * $this->scale) . $this->unit; |
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return <<<SVG |
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<svg xmlns="http://www.w3.org/2000/svg" width="{$width}" height="{$height}" viewBox="0 0 {$this->maxX} {$this->maxY}"> |
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<defs> |
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<style> |
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line.regular { |
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stroke: rgb(0,0,255); |
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stroke-width: 4; |
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} |
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line.flex { |
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stroke: rgb(255,0,0); |
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stroke-width: 4; |
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stroke-dasharray: 20 4; |
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} |
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</style> |
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</defs> |
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{$instructions} |
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</svg> |
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SVG; |
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} |
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/** |
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* Pushes a command to the instructions. |
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* |
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* No effect in the SVG output. |
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*/ |
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public function pushCommand(string $command): PlotBuilder |
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{ |
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return $this; |
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} |
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/** |
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* Lifts the pen up. |
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*/ |
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public function penUp(): PlotBuilder |
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{ |
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$this->penIsDown = false; |
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return $this; |
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} |
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/** |
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* Pushes the pen down on paper. |
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*/ |
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public function penDown(): PlotBuilder |
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{ |
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$this->penIsDown = true; |
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return $this; |
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} |
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/** |
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* Changes the plotter pen to use flexcut. |
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*/ |
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public function flexCut(): PlotBuilder |
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{ |
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return $this->changePen(6); |
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} |
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/** |
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* Change to the regular plotter pen. |
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*/ |
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public function regularCut(): PlotBuilder |
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{ |
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return $this->changePen(0); |
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} |
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/** |
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* Changes the pen pressure in gram. |
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* |
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* No effect in the SVG output. |
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*/ |
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public function pressure(int $gramPressure): PlotBuilder |
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{ |
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return $this; |
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} |
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/** |
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* Specifies measuring unit. |
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* 1 selects 0.001 inch |
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* 5 selects 0.005 inch |
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* M selects 0.1 mm |
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* |
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* @throws Exception |
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*/ |
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public function setMeasuringUnit($unit): PlotBuilder |
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{ |
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switch ($unit) { |
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case 'M': |
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$this->unit = 'mm'; |
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$this->scale = 0.1; |
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break; |
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case 1: |
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$this->unit = 'in'; |
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$this->scale = 0.001; |
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break; |
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case 5: |
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$this->unit = 'in'; |
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$this->scale = 0.005; |
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break; |
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default: |
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throw new Exception('Unhandled unit: ' . $unit); |
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} |
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return $this; |
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} |
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/** |
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* Changes the plotter velocity. |
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* |
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* No effect in the SVG output. |
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*/ |
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public function velocity(int $velocity): PlotBuilder |
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{ |
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return $this; |
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} |
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/** |
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* Flips the x, y coordinates. |
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*/ |
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public function flipAxes(): PlotBuilder |
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{ |
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$this->axesFlipped = true; |
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return $this; |
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} |
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/** |
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* Cuts off paper when a operation finishes. |
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* |
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* No effect in the SVG output. |
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*/ |
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public function cutOff(): PlotBuilder |
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{ |
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return $this; |
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} |
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protected function pushInstruction(string $name, array $parameters): PlotBuilder |
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{ |
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$instruction = '<' . $name; |
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foreach ($parameters as $parameter => $value) { |
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$instruction .= ' ' . $parameter . '="' . htmlspecialchars($value) . '"'; |
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} |
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$this->instructions[] = $instruction . ' />'; |
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return $this; |
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} |
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} |
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