Graphics.Shape

Image constructors

Documentation

data Mode

Drawing mode.

Instances

Eq Mode

Defined in Graphics.Shape

Methods

(==) :: Mode -> Mode -> Bool

(/=) :: Mode -> Mode -> Bool

solid :: Mode

Type of drawing mode.

outline :: Mode

Type of drawing mode.

circle

Arguments

:: Float

r

-> Mode

m

-> Color

c

-> Image

Constructs a circle of radius r, drawing mode m and color c.

ellipse

Arguments

:: Float

w

-> Float

h

-> Mode

m

-> Color

c

-> Image

Constructs an ellipse of width w, height h, mode m, and color c.

line

Arguments

:: Float

x1

-> Float

y1

-> Color

c

-> Image

Constructs an image of a line segment of color c that connects the points (0,0) to (x1, y1).

addLine

Arguments

:: Image

i

-> Float

x1

-> Float

y1

-> Float

x2

-> Float

y2

-> Color

-> Image

Adds a line to the given image i of color c, starting from point (x1, y1) and going to point (x2, y2). If the line crosses the given image's binding box, then new image dimesions are changed to accommodate the line.

emptyImage :: Image

Constructs an image of width and height 0.

triangle

Arguments

:: Float

l

-> Mode

m

-> Color

c

-> Image

Constructs an upward-pointing equilateral triangle with length l, mode m, and color c.

rightTriangle

Arguments

:: Float

b

-> Float

p

-> Mode

m

-> Color

c

-> Image

Constructs a right triangle with base length b, perpendicular length p, mode m, and color c.

isoscelesTriangle

Arguments

:: Float

l

-> Float

a

-> Mode

m

-> Color

c

-> Image

Constructs a triangle of two equal-length sides, of length l, where the angle between those sides is a, mode is m and color is c. If the angle is less than 180, then the triangle will point up, else it will point down.

The following image from 2htdp/image documentation is useful for the following family of functions.

triangleSSS

Arguments

:: Float

a

-> Float

b

-> Float

c

-> Mode

m

-> Color

color

-> Image

Constructs a triangle of side a, b, and c. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleASS

Arguments

:: Float

A

-> Float

b

-> Float

c

-> Mode

mode

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle A, and lengths b and c. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleSAS

Arguments

:: Float

B

-> Float

a

-> Float

c

-> Mode

mode

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle B, and lengths a and c. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleSSA

Arguments

:: Float

C

-> Float

a

-> Float

c

-> Mode

mode

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle C, and lengths a and c. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleAAS

Arguments

:: Float

A

-> Float

B

-> Float

c

-> Mode

m

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle A, angle B, and length c. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleASA

Arguments

:: Float

A

-> Float

C

-> Float

b

-> Mode

m

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle A, angle C, and length b. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

triangleSAA

Arguments

:: Float

B

-> Float

C

-> Float

a

-> Mode

m

-> Color

color

-> Image

Constructs a triangle of mode m, color color, angle B, angle C, and length a. The variables refer to the diagram above. If it's not possible to construct the triangle with the given arguments, an empty image is returned.

square

Arguments

:: Float

s

-> Mode

m

-> Color

c

-> Image

Constructs a square of side s, mode m, and color c.

rectangle

Arguments

:: Float

w

-> Float

h

-> Mode

m

-> Color

c

-> Image

Constructs a rectangle of width w, height h, mode m, and color c.

rhombus

Arguments

:: Float

l

-> Float

a

-> Mode

m

-> Color

c

-> Image

Constructs a four sided polygon with all equal sides of length l, where the top and bottom pair of angles is a, and the left and right are 180 - a. As usual, mode is m and color is c.

star

Arguments

:: Float

l

-> Mode

m

-> Color

c

-> Image

Constructs a star with five points of mode m and color c. The argument l determines the side length of the internal pentagon. Currently, a solid star is glitchy since it is a non-convex polygon and openGL (the underlying graphics library) doesn't draw them correctly. This will be corrected in future versions.