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A PHP Library to plot graphs and figures on a xy(-two-dimensional)-plane.

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PHP-Plotter2d

A PHP Library to plot graphs and figures on a xy(-two-dimensional)-plane.

1. Features

PHP-Plotter2d provides basic features to plot graphs and figures on a xy(-two-dimensional)-plane.

1.1. Canvas

You can draw figures freely on the canvas, such as: Pixels, Lines, Boxes, Circles, Ellipses, Polygons and Bezier Curves. You can also put Text or Fill the canvas with a specific color. You can save the Canvas to a file.

1.2. Plotarea

You can put figures within the Plotarea by just specifying the coordinates on the xy-plane without having to consider the pixel coordinates on the image. Transformer automatically maps the coordinates on the xy-plane to pixel coordinates on the image. Plotarea is automatically placed on the Canvas. You can adjust the position and the size of Plotarea on the Canvas.

1.3. Transformer

You can use only Transformer separately from Canvas and Plotarea.

use Macocci7\PhpPlotter2d\Transformer;

$transformer = new Transformer(
    viewport: ['x' => [-1, 4], 'y' => [-2, 3]],
    plotarea: [
        'width' => 400,
        'height' => 400,
    ],
);

$points = $transformer->getCoords([
    [-0.5, -1.2],
    [1.3, 0.6],
    [3.4, 2.8],
]);

2. Contents

3. Requirements

  • PHP 8.1 or later
  • Imagick PHP Extention
  • Composer

4. Installation

composer require macocci7/php-plotter2d

5. Usage

5.1. Handling Canvas

To draw figures on the Canvas, create an instance of Canvas at first. Use Plotter::make() method to get an instance of Canvas. Pass the width and height of the Canvas in the canvasSize parameter.

<?php

require_once __DIR__ . '/../vendor/autoload.php';

use Macocci7\PhpPlotter2d\Plotter;

$canvas = Plotter::make(
    canvasSize: ['width' => 800, 'height' => 400],  // required
);

Now, you can draw figures on the Canvas with draw* methods.

$canvas->drawText('Basic Usage', 300, 20, 32, valign: 'top');

You can save the image into a file with save method.

$canvas
    ->drawText('Handling Canvas', 300, 20, 32, valign: 'top')
    ->save('img/HandlingCanvas.png');

Available methods to draw on the Canvas:

fill()

fills the Canvas with the specified color.

params type required default exampl description
$x int required 10 horizontal position (in pixel)
$y int required 20 vertical position (in pixel)
$color string required '#0000ff' color code (in hex format)

drawPixel()

draws a pixel.

params type required default exampl description
$x int required 10 horizontal position (in pixel)
$y int required 20 vertical position (in pixel)
$color string required '#0000ff' color code (in hex format)

drawLine()

draws a line.

params type required default exampl description
$x1 int required 10 horizontal position of starting point (in pixel)
$y1 int required 20 vertical position of starting point (in pixel)
$x2 int required 30 horizontal position of end point (in pixel)
$y2 int required 40 vertical position of end point (in pixel)
$width int 1 2 vertical position (in pixel)
$color string '#000000' '#0000ff' color code (in hex format)
$dash int[] [] [8, 4, 2, 4] dash pattern(solid and blank)

drawBox()

draws a box.

Note: null value for a color code results in transparent.

params type required default exampl description
$x1 int required 10 horizontal position of starting point (in pixel)
$y1 int required 20 vertical position of starting point (in pixel)
$x2 int required 30 horizontal position of end point (in pixel)
$y2 int required 40 vertical position of end point (in pixel)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)
$dash int[] [] [8, 4, 2, 4] dash pattern (solid and blank)

drawCircle()

draws a circle.

Note: null value for a color code results in transparent.

params type required default exampl description
$x int required 60 horizontal position of the center (in pixel)
$y int required 50 vertical position of the center (in pixel)
$radius int required 40 radius of the circle (in pixel)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

drawEllipse()

draws an ellipse.

Note: null value for a color code results in transparent.

params type required default exampl description
$x int required 60 horizontal position of the center (in pixel)
$y int required 50 vertical position of the center (in pixel)
$width int required 40 width of the ellipse (in pixel)
$height int required 30 height of the ellipse (in pixel)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

drawArc()

draws an arc.

Note: null value for a color code results in transparent.

params type required default exampl description
$x int required 60 horizontal position of the center (in pixel)
$y int required 50 vertical position of the center (in pixel)
$radius int required 40 radius of the circle (in pixel)
$degrees1 int|float required 32.1 starting angle (in degrees)
$degrees2 int|float required -23.4 terminal angle (in degrees)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)
$withSides bool false true whether to draw sides

drawEllipticalArc()

draws an elliptical arc.

Note: If a non-null background color is specified, or true is specified for the withSide argument, an elliptical sector connecting the center of the ellipse and the elliptical arc will be drawn.

Note: null value for a color code results in transparent.

params type required default exampl description
$x int required 60 horizontal position of the center (in pixel)
$y int required 50 vertical position of the center (in pixel)
$width int required 80 width of the ellipse (in pixel)
$height int required 120 height of the ellipse (in pixel)
$degrees1 int|float required 32.1 starting angle (in degrees)
$degrees2 int|float required -23.4 terminal angle (in degrees)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)
$withSides bool false true whether to draw sides

drawPolygon()

draws a polygon.

Note: null value for a color code results in transparent.

params type required default exampl description
$points array<int, int[]> required [[1, 2], [3, 4]] positions of the points (in pixel)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

drawBezier()

draws a Bezier curve.

Note: null value for a color code results in transparent.

params type required default exampl description
$points array<int, int[]> required [[1, 2], [3, 4]] positions of the points (in pixel)
$backgroundColor string|null null '#ccffff' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

drawText()

draws text.

params type required default exampl description
$text string required 'Title' text to draw
$x int required 40 horizontal position (in pixel)
$y int required 40 vertical position (in pixel)
$fontSize int 16 32 font size (in pixel)
$fontPath string './fonts/myfont.ttf' 32 font path (true type)
$fontColor string '#000000 '#009900' font color (in hex format)
$align string 'left' 'center' text align
$valign string 'bottom' 'middle' text valign
$angle int\float 0 -23.4 degrees to rotate (counterclockwise)
$offsetX int\float 0 3.5 x-offset from left edge (after rotation)
$offsetY int\float 0 -1.5 y-offset from top edge (after rotation)
$rotateAlign string 'center' 'left' align (after rotation)
$rotateValign string 'middle' 'top' valign (after rotation)

5.2. Handling Plotarea

To plot figures within the Plotarea, ceate an instance of Canvas with the parameters of viewport and plotarea.

viewport is the definition of the visible area of the xy-plane, which consists of arrays of x and y ranges.

plotarea has five attributes: offset, width, height, backgroundColor and placeAutomatically.

<?php

require_once __DIR__ . '/../vendor/autoload.php';

use Macocci7\PhpPlotter2d\Plotter;

$canvas = Plotter::make(
    canvasSize: [
        'width' => 800,     // required
        'height' => 400,    // required
    ],
    viewport: [
        'x' => [-5, 5],     // -5 <= x <= 5
        'y' => [-5, 5],     // -5 <= y <= 5
    ],
    plotarea: [
        // 20pix from left edge, 30pix from top edge
        // default=(10% of the canvas)
        'offset' => [20, 30],
        'width' => 640, // in pix, default=(80% of the canvas)
        'height' => 360 // in pix, default=(80% of the canvas)
        'backgroundColor' => '#dddddd', // defautl='#ffffff'
        'placeAutomatically' => false, // default=true
    ],
    backgroundColor: '#0000cc',  // optional, default='#ffffff'
);

Now, you can plot figures within the Plotarea by using plot* methods with coordinates on the xy-plane.

// boxrange: (-3.5, 4.2) - (2.5, 2.3)
// backgroundColor: '#ffff99'
// borderWidth: 1 (pix)
// borderColor: '#0000ff'
$canvas
    ->plotBox(-3.5, 4.2, 2.5, 2.3, '#ffff99', 1, '#0000ff')
    ->save('img/HandlingPlotarea.png');

When you set $plotarea['placeAutomatically'] as false, you need to use placePlotarea() method to place Plotarea on the Canvas after using plot* methods.

This is expected to avoid slowdowns when using the plot* methods frequently, and unexpected results when making the background of Plotarea transparent.

$canvas
    ->plotBox(-3.5, 4.2, 2.5, 2.3, '#ffff99', 1, '#0000ff')
    ->placePlotarea()
    ->save('img/HandlingPlotarea.png');

Available plot* methods to plot figures within the Plotarea:

plotFill()

fills the Plotarea with the specified color.

parmas type required default example description
$x int|float required -2.4 x-coordinate
$y int|float required 3.2 y-coordinate
$color string required '#cccccc' color code (in hex format)

plotPixel()

plots a pixel within the Plotarea.

parmas type required default example description
$x int|float required -3.5 x-coordinate
$y int|float required 4.5 y-coordinate
$color string required '#ff0000' color code (in hex format)

plotLine()

plots a line within the Plotarea.

parmas type required default example description
$x1 int|float required -6.2 x-coordinate of the starting point
$y1 int|float required -7.4 y-coordinate of the starting point
$x2 int|float required 8.3 x-coordinate of the end point
$y2 int|float required 6.4 y-coordinate of the end point
$width int 1 2 width (in pixel)
$color string '#000000' '#009900' color code (in hex format)
$dash int[] [] [8, 4, 2, 4] dash pattern (solid and blank)

plotBox()

polots a box within the Plotarea.

Note: null value for a color code results in transparent.

parmas type required default example description
$x1 int|float required -3.5 x-coordinate of the starting point
$y1 int|float required 4.5 y-coordinate of the starting point
$x2 int|float required -0.5 x-coordinate of the end point
$y2 int|float required 2.5 y-coordinate of the end point
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)
$dash int[] [] [8, 4, 2, 4] dash pattern (solid and blank)

plotCircle()

plots a ciele within the Plotarea.

Note: If the viewport aspect ratio and the plotarea aspect ratio are not equal, plotCircle() draws an ellipse.

Use plotPerfectCircle() if you want to plot a perfect circle regardless of transformation rate.

Note: null value for a color code results in transparent.

parmas type required default example description
$x int|float required -3.5 x-coordinate of the center
$y int|float required 4.5 y-coordinate of the center
$radius int|float required 2.5 radius
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

plotPerfectCircle()

plots a perfect ciele within the Plotarea regardless of transformation rate.

Note: Specify the radius in pix.

Note: null value for a color code results in transparent.

parmas type required default example description
$x int|float required -3.5 x-coordinate of the center
$y int|float required 4.5 y-coordinate of the center
$radius int required 2 radius (in pix)
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

plotEllipse()

plots an ellipse within the Plotarea.

Note: null value for a color code results in transparent.

parmas type required default example description
$x int|float required -3.5 x-coordinate of the center
$y int|float required 4.5 y-coordinate of the center
$width int|float required 2.5 width
$height int|float required 5.5 height
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

plotArc()

plots an arc within the Plotarea.

Note: If the viewport aspect ratio and the plotarea aspect ratio are not equal, plotArc() draws an elliptical arc.

Note: null value for a color code results in transparent.

parmas type required default example description
$x int|float required -3.5 x-coordinate of the center
$y int|float required 4.5 y-coordinate of the center
$radius int|float required 2.5 radius
$degrees1 int|float required 23.4 starting angle (in degrees)
$degrees2 int|float required -32.1 terminal angle (in degrees)
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)
$widthSides bool false true whether to draw sides

plotPolygon()

plots a polygon within the Plotarea.

Note: null value for a color code results in transparent.

parmas type required default example description
$points list<int[]> required [[-3, -4], [-2, 1]] coorinates of the points
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

plotBezier()

plots a Bezier curve within the Plotarea.

Note: null value for a color code results in transparent.

parmas type required default example description
$points list<int[]> required [[-3, -4], [-2, 1]] coorinates of the points
$backgroundColor string|null null '#cccccc' background color (in hex format)
$borderWidth int 1 2 border width (in pixel)
$borderColor string|null '#000000' '#0000ff' border color (in hex format)

plotText()

plots text within the Plotarea.

parmas type required default example description
$text string required 'Title' text to plot
$x int|string required -4.5 x-coordinate
$y int|string required 4.5 y-coordinate
$fontSize int 16 32 font size (in pix)
$fontPath string '' './fonts/myfont.ttf' font path (true type)
$fontColor string '#000000' '#666666' font color (in hex format)
$align string 'left' 'center' hirizontal align
$valign string 'bottom' 'middle' vertical align
$angle int|float 0 -23.4 degrees to rotate (counterclockwise)
$offsetX int|float 0 3.5 x-offset from left edge (after rotation)
$offsetY int|float 0 -1.5 y-offset from top edge (after rotation)
$rotateAlign string 'center' 'left' align (after rotation)
$rotateValign string 'middle' 'top' valign (after rotation)

plotGridHorizon()

plots horizontal grids within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.5 interval between grids (in y direction)
$width int 1 2 width (in pixel)
$color string '#999999' '#ff99ff' color code (in hex format)

plotGridVertical()

plots vertical grids within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.5 interval between grids (in x direction)
$width int 1 2 width (in pixel)
$color string '#999999' '#ff99ff' color code (in hex format)

plotGridValuesX()

plots grid values on the x-axis within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.5 interval between grids (in x direction)
$size int 16 2 width (in pixel)
$color string '#666666' '#3333cc' color code (in hex format)
$fontPath string '' './fonts/myfont.ttf' font path (true type)
$position string 'lower' 'upper' relative position to the x-axis
$except int[] [0] [-5, -3, -1, 0, 1, 3, 5] list of values to exclude

plotGridValuesY()

plots grid values on the y-axis within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.5 interval between grids (in y direction)
$size int 16 2 width (in pixel)
$color string '#666666' '#3333cc' color code (in hex format)
$fontPath string '' './fonts/myfont.ttf' font path (true type)
$position string 'lower' 'upper' relative position to the x-axis
$except int[] [0] [-5, -3, -1, 0, 1, 3, 5] list of values to exclude

plotAxisX()

plots x-axis with within the Plotarea.

parmas type required default example description
$width int 1 2 width (in pix)
$color string '#000000' '#000099' color code (in hex format)

plotAxisY()

plots x-axis with within the Plotarea.

parmas type required default example description
$width int 1 2 width (in pix)
$color string '#000000' '#000099' color code (in hex format)

plotAxisLabelO()

plots the origin label within the Plotarea.

parmas type required default example description
$label string 'O' 'Z' width (in pix)
$size int 16 24 font size (in pix)
$color string '#000000' '#000099' color code (in hex format)
$quadrant int 3 4 number of quadrant to plot the label for
$fontPath string '' './fonts/myfont.ttf' font path (true type)

plotAxisLabelX()

plots the x-axis label within the Plotarea.

parmas type required default example description
$label string 'x' 'A' width (in pix)
$size int 16 24 font size (in pix)
$color string '#000000' '#000099' color code (in hex format)
$position string 'lower' 'upper' relative position to the x-axis
$fontPath string '' './fonts/myfont.ttf' font path (true type)

plotAxisLabelY()

plots the y-axis label within the Plotarea.

parmas type required default example description
$label string 'y' 'B' width (in pix)
$size int 16 24 font size (in pix)
$color string '#000000' '#000099' color code (in hex format)
$position string 'left' 'right' relative position to the y-axis
$fontPath string '' './fonts/myfont.ttf' font path (true type)

plotScaleX()

plots the x-axis scale within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.0 interval between scale lines.
$width int 1 2 width (in pix)
$length int 6 10 scale line length (in pix)
$color string '#000000' '#990000' color code (in hex format)

plotScaleY()

plots the y-axis scale within the Plotarea.

Note: If 0 is passed to $interval, $interval will be set to the automatically calculated optimal value.

parmas type required default example description
$interval int|float 0 2.0 interval between scale lines.
$width int 1 2 width (in pix)
$length int 6 10 scale line length (in pix)
$color string '#000000' '#990000' color code (in hex format)

5.3. Handling Transformer

To use Transformer, create an instance of Transformer at first.

use Macocci7\PhpPlotter2d\Transformer;

$transformer = new Transformer(
    viewport: ['x' => [-1, 4], 'y' => [-2, 3]],
    plotarea: [
        'width' => 400,
        'height' => 400,
    ],
);

Now, you can use get* methods.

$x = -0.5;
$y = 2.8;
$coord = $transformer->getCoord($x, $y);
echo "({$x}, {$y}) -> ({$coord['x']}, {$coord['y']})" . PHP_EOL;

This code results in:

(-0.5, 2.8) -> (40, 16)

Available methods:

getRateX()

returns the transformation rate of x,

which is defined as:

(width of plogarea) / (range of x)

getRateY()

returns the transformation rate of y,

which is defined as:

(height of plotarea) / (range of y)

getCoord()

returns the transformed coordinate.

params type required default example description
$x int|float required -0.5 x-coordinate on the xy-plane.
$y int|float required 2.8 y-coordinate on the xy-plane.

For example,

$transformer->getCoord(-0.5, 2.8);

returns

['x' => 40, 'y' => 16]

getCoords()

returns multiple transformed coordinates as an arrray.

params type required default example description
$points array<int, array<int, int|float>> required (see below) coordinates

For example,

$transformer->getCoords([
    [-0.5, -1.2],
    [1.3, 0.6],
    [3.4, 2.8],
]);

returns

[
    0 => [40, 336],
    1 => [184, 192],
    2 => [352, 16],
]

getSpanX()

returns the transformed span of the x-direction component.

params type required default example description
$span int|float required 0.25 span of the x-direction component

getSpanY()

returns the transformed span of the y-direction component.

params type required default example description
$span int|float required 0.25 span of the y-direction component

6. Examples

7. LICENSE

MIT

Copyright 2024 macocci7

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A PHP Library to plot graphs and figures on a xy(-two-dimensional)-plane.

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