CLASS Shape (Defined in: jpgraph_canvtools.php : 70)

Shape
Bezier() Circle() FilledCircle() FilledPolygon() FilledRectangle() FilledRoundedRectangle() IndentedRectangle() Line() Polygon() Rectangle() RoundedRectangle() SetColor() SetTextAlign() ShadowRectangle() Shape() StrokeText()

Class usage and Overview
This is mainly awrapper class around thye current image class used. It is meant to make it easier to work with a Canvas graph and a Canvas scale. Basically the class uses the specified scale to trasnalte coordinates which is then passed on to the standard Image routines.

See also related classes:
CanvasScale

Class Methods

function Bezier($p,$aSteps)
Draw a bezier curve

Argument | Default | Description
--- | --- | ---
$p |  | Array with control points
$aSteps | 40 | Number of line segments in curve

Description
Draw a Bezier line with specified in the $p array. The points are specified according to the current scale. The positions in the array has the following meaning

(0,1) x0,y0 (First point on curver)
(2,3) x,y, (Control point 1)
(4,5) x,y, (Control point 2)
(6,7) x,y, (End point of curve)

See example in canvasbezierex1.php

Example

$p = array(3,6,6,9,5,3,7,4);
$shape->SetColor('black');
$shape->Bezier($p);

function Circle($x1,$y1,$r)
Draw a circle

Argument | Default | Description
--- | --- | ---
$x1 |  | Center X-coordinate
$y1 |  | Center Y-coordinate
$r |  | Radius

Description
Draw a circle onto the canvas
See also
Image::Circle

Example

// The shape class is wrapper around the Imgae class which translates
// the coordinates for us
$shape = new Shape($g,$scale);
$shape->SetColor('black');
// .. and a circle (x,y,diameter)
$shape->Circle(5,14,2);

function FilledCircle($x1,$y1,$r)
Draw a filled circle to a canvas

Argument | Default | Description
--- | --- | ---
$x1 |  | Center X-coordinate
$y1 |  | Center Y-coordinate
$r |  | Radius

Description
Draw a filled circle on the canvas using the specified scale.

Note: If you are using GD1.xx you will see moire-patterns in large circles. This is due to the lack of a proper filled circle function in GD 1.xx. Using GD 2.xx will avoid this problem.

See also
Image::FilledCircle

Example

// The shape class is wrapper around the Imgae class which translates
// the coordinates for us
$shape = new Shape($g,$scale);
$shape->SetColor('black');
// .. and a circle (x,y,diameter)
$shape->FilledCircle(5,14,2);

function FilledPolygon($p)
Draw a filled polygon

Argument | Default | Description
--- | --- | ---
$p |  | Polygon array

Description
Draw a filled polygon

function FilledRectangle($x1,$y1,$x2,$y2)
Draw a filled rectangle on the canvas

Argument | Default | Description
--- | --- | ---
$x1 |  | Top left X
$y1 |  | Top left Y
$x2 |  | Bottom right X
$y2 |  | Bottom right Y

Description
Draw a filled rectangle on the canvas using the current sclae.

Example

// .. add a rectangle
$shape->SetColor('green');
$shape->FilledRectangle(15,8,19,14);

function FilledRoundedRectangle($x1,$y1,$x2,$y2,$r)
Create a filled rectangle with rounded corners

Argument | Default | Description
--- | --- | ---
$x1 |  | Top left X
$y1 |  | Top left Y
$x2 |  | Bottom right X
$y2 |  | Bottom right Y
$r | null | Corner radius

Description
Create a filled rectangle with rounded corners

function IndentedRectangle($xt,$yt,$w,$h,$iw,$ih,$aCorner,$aFillColor,$r)
A filled rectangle with one corner 'indented'

Argument | Default | Description
--- | --- | ---
$xt |  | Top left X
$yt |  | Top left Y
$w |  | Width
$h |  | Height
$iw | 0 | Indented width
$ih | 0 | Indeted height
$aCorner | 3 | Corner to indent
$aFillColor | "" | Fill color
$r | 4 | Corner radius

Description
A rounded rectangle where one of the corner has been moved "into" the rectangle. The indention is determined by the two argument 'iw' width and 'ih' height.

The corners (as used in the $aCorner) are numbered as 0=Top left, 1=top right, 2=bottom right, 3=bottom left

function Line($x1,$y1,$x2,$y2)
Draw a line between

Argument | Default | Description
--- | --- | ---
$x1 |  | X1
$y1 |  | Y1
$x2 |  | X2
$y2 |  | Y2

Description
Draw a line between two points in the canvas using the current scale.
See also
Image::Line

Example

// Add a black line
$shape->SetColor('black');
$shape->Line(0,0,20,20);

function Polygon($p,$aClosed)
Draw a closed polygon

Argument | Default | Description
--- | --- | ---
$p |  | Array of points in polygon
$aClosed | false | No description available

Description
Draw a closed polygon

Example

$p = array(3,6,6,9,5,3,7,4);
$shape->SetColor('blue:0.35');
$shape->Polygon($p);

function Rectangle($x1,$y1,$x2,$y2)
Draw a rectangle on the canvas

Argument | Default | Description
--- | --- | ---
$x1 |  | Top left X
$y1 |  | Top left Y
$x2 |  | Bottom right X
$y2 |  | Bottom right Y

Description
Draw a rectangle on the canvas using the current scale.

Example

// .. add a rectangle
$shape->SetColor('green');
$shape->Rectangle(15,8,19,14);

function RoundedRectangle($x1,$y1,$x2,$y2,$r)
Draw a rectangle with rounded corners

Argument | Default | Description
--- | --- | ---
$x1 |  | Top left X
$y1 |  | Top left Y
$x2 |  | Bottom right X
$y2 |  | Bottom right Y
$r | null | Corner radius

Description
Draw a rectangle with rounded corners

function SetColor($aColor)
Specify color to use when drawing shapes

Argument | Default | Description
--- | --- | ---
$aColor |  | Color specification

Description
Specify color to use when drawing shapes
See also
RGB::Color

Example

// Add a black line
$shape->SetColor('black');
$shape->Line(0,0,20,20);

function SetTextAlign($halign,$valign)
Specify bae point for StrokeText()

Argument | Default | Description
--- | --- | ---
$halign |  | Horizontal position for basepoint
$valign | "bottom" | Vertical position for base point

Description
Specifies how the coordinate for the text should be interpretated. Possible values for horizontal base-position are

- "left"
- "center"
- "right"

and for vertical

- "top"
- "center"
- "bottom"

Example

// Interpret the text coordinate as beeing the
// top left corner of the bounding box for the text
$shape->SetTextAlign('left','top');
$shape->StrokeText(....)

function ShadowRectangle($x1,$y1,$x2,$y2,$fcolor,$shadow_width,$shadow_color)
Draw a filled rectangle with a drop shadow

Argument | Default | Description
--- | --- | ---
$x1 |  | Top left X
$y1 |  | Top left Y
$x2 |  | Bottom right X
$y2 |  | Bottom right Y
$fcolor | false | Fill color
$shadow_width | null | Shadow width
$shadow_color | array(102,102,102) | Shadow color

Description
Draw a filled rectangle with a drop shadow

function Shape(&$aGraph,&$scale)
Methods to draw shapes on canvas

Argument | Default | Description
--- | --- | ---
&$aGraph |  | Canvas graph
&$scale |  | Canvas scale

Description
Create a new shape class used to draw siple shape onto a canvas using the specified scale.
See also
CanvasGraph::CanvasGraph and CanvasScale::CanvasScale

Example

// Setup a basic canvas we can work
$g = new CanvasGraph(400,200,'auto');
$g->SetMargin(5,11,6,11);
$g->SetShadow();
$g->SetMarginColor("teal");
// We need to stroke the plotarea and margin before we add the
// text since we otherwise would overwrite the text.
$g->InitFrame();
// Create a new scale
$scale = new CanvasScale($g);
$scale->Set(0,$xmax,0,$ymax);
// The shape class is wrapper around the Imgae class which translates
// the coordinates for us
$shape = new Shape($g,$scale);

function StrokeText($x1,$y1,$txt,$dir,$paragraph_align)
Stroke a text string onto the canvas

Argument | Default | Description
--- | --- | ---
$x1 |  | X-position
$y1 |  | Y-position
$txt |  | Text string
$dir | 0 | Angle
$paragraph_align | "left" | Paragraph align for multi-line texts

Description
Stroke a text string onto the canvas.
See also
CanvasRectangleText::CanvasRectangleText