2.3 CLIM Drawing Functions

*point-seq*is a sequence of point objects.*coord-seq*is a sequence of coordinate pairs, which are real numbers. It is an error if*coord-seq*does not contain an even number of elements.- The drawing functions take keyword arguments specifying drawing options. For information on the drawing options, see Section 3.2, "Using CLIM Drawing Options". If you prefer to create and use point objects, see Subsection 2.5.2, "CLIM Point Objects".

- Arguments:
*sheet point*`&key`

ink clipping-region transformation line-style line-thickness line-unit

- Arguments:
*sheet x y*`&key`

ink clipping-region transformation line-style line-thickness line-unit

- Summary:
- These functions (structured and spread arguments, respectively) draw a single point on the sheet
*sheet*at the point*point*(or the position (*x, y*)). - The unit and thickness components of the current line style (see Section 3.2, "Using CLIM Drawing Options") affect the drawing of the point by controlling the number of pixels used to render the point on the display device.

- Arguments:
*sheet point-seq*`&key`

ink clipping-region transformation line-style line-thickness line-unit

- Arguments:
*sheet coord-seq*`&key`

ink clipping-region transformation line-style line-thickness line-unit

- Summary:
- These functions (structured and spread arguments, respectively) draw a set of points on the sheet
*sheet*. - For convenience and efficiency, these functions exist as equivalents to

` ``(map nil #'(lambda (point) (draw-point sheet point)) point-seq) `

- and

(do ((i 0 (+ i 2))) ((= i (length coord-seq))) (draw-point* sheet (elt coord-seq i) (elt coord-seq (+ i 1))))

- Arguments:
*sheet point1 point2*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape

- Arguments:
*sheet x1 y1 x2 y2*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape

- Summary:
- These functions (structured and spread arguments, respectively) draw a line segment on the sheet
*sheet*from the point*point1*to*point2*(or from the position (*x1*,*y1*) to (*x2*,*y2*)). - The current line style (see Section 3.2, "Using CLIM Drawing Options") affects the drawing of the line in the obvious way, except that the joint shape has no effect. Dashed lines start dashing at
*point1*.

- Arguments:
*sheet point-seq*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape

- Arguments:
*sheet coord-seq*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape

- Summary:
- These functions (structured and spread arguments, respectively) draw a set of disconnected line segments. These functions are equivalent to

(do ((i 0 (+ i 2))) ((= i (length point-seq))) (draw-line sheet (elt point-seq i) (elt point-seq (1+ i))))

- and

(do ((i 0 (+ i 4))) ((= i (length coord-seq))) (draw-line* sheet (elt coord-seq i) (elt coord-seq (+ i 1)) (elt coord-seq (+ i 2)) (elt coord-seq (+ i 3))))

- Arguments:
*sheet point-seq*`&key`

(filled**t**) (closed**t**) i*nk clipping-region transformation line-style line-thickness line-unit line-dashes line-joint-shape line-cap-shape*

- Arguments:
*sheet coord-seq*`&key`

(filled**t**) (closed**t**) ink clippin*g-region transformation line-style line-thickness line-unit line-dashes line-joint-shape line-cap-shape*

- Summary:
- Draws a polygon or polyline on the sheet
*sheet*. When*filled*is**nil**, this draws a set of connected lines; otherwise, it draws a filled polygon. If*closed*is**t**(the default) and*filled*is**nil**, it ensures that a segment is drawn that connects the ending point of the last segment to the starting point of the first segment. The current line style (see Section 3.3, "CLIM Line Styles" for details) affects the drawing of unfilled polygons in the obvious way. The cap shape affects only the "open" vertices in the case when*closed*is**nil**. Dashed lines start dashing at the starting point of the first segment, and may or may not continue dashing across vertices, depending on the window system. - If
*filled*is**t**, a closed polygon is drawn and filled in. In this case,*closed*is assumed to be**t**as well.

- Arguments:
*sheet point1 point2*`&key`

(filled**t**) ink clipping-region transformation line-style line-thickness line-unit line-dashes line-joint-shape

- Arguments:
*sheet x1 y1 x2 y2*`&key`

(filled**t**) ink clipping-region transformation line-style line-thickness line-unit line-dashes line-joint-shape

- Summary:
- Draws either a filled or unfilled rectangle on the sheet
*sheet*that has its sides aligned with the coordinate axes of the native coordinate system. One corner of the rectangle is at the position (*x1*,*y1*) or point1 and the opposite corner is at (*x2*,*y2*) or point2. The arguments*x1*,*y1*,*x2*, and*y1*are real numbers that are canonicalized in the same way as for**make-bounding-rectangle**.*filled*is as for**draw-polygon***. - The current line style (see Section 3.2, "Using CLIM Drawing Options") affects the drawing of unfilled rectangles in the obvious way, except that the cap shape has no effect.

- Arguments:
*sheet points*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-joint-shape

- Arguments:
*sheet position-seq*`&key`

ink clipping-region transformation line-style line-thickness line-unit line-dashes line-joint-shape

- Summary:
- These functions (structured and spread arguments, respectively) draw a set of rectangles on the sheet
*sheet*. points is a sequence of point objects; position-seq is a sequence of coordinate pairs. It is an error if*position-seq*does not contain an even number of elements. - Ignoring the drawing options, these functions are equivalent to:

(do ((i 0 (+ i 2))) ((= i (length points))) (draw-rectangle sheet (elt points i) (elt points (1+ i))))

- and

(do ((i 0 (+ i 4))) ((= i (length position-seq))) (draw-rectangle* sheet (elt position-seq i) (elt position-seq (+ i 1)) (elt position-seq (+ i 2)) (elt position-seq (+ i 3))))

- Arguments:
*sheet center-pt radius-1-dx radius-1-dy radius-2-dx radius-2-dy*`&key`

(filled**t***) start-angle end-angle ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape*

- Arguments:
*sheet center-x center-y radius-1-dx radius-1-dy radius-2-dx radius-2-dy*`&key`

(filled**t***) start-angle end-angle ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape*

- Summary:
- These functions (structured and spread arguments, respectively) draw an ellipse (when
*filled*is**t**, the default) or an elliptical arc (when*filled*is**nil**) on the sheet*sheet*. The center of the ellipse is the point*center-pt*(or the position (*center-x*,*center-y*)). - Two vectors, (
*radius-1-dx*,*radius-1-dy*) and (*radius-2-dx*,*radius-2-dy*) specify the bounding parallelogram of the ellipse as explained in Section 2.5, "General Geometric Objects in CLIM." All of the radii are real numbers. If the two vectors are collinear, the ellipse is not well-defined and the**ellipse-not-well-defined**error will be signaled. The special case of an ellipse with its major axes aligned with the coordinate axes can be obtained by setting both*radius-1-dy*and*radius-2-dx*to 0. *start-angle*and*end-angle*are real numbers that specify an arc rather than a complete ellipse. Angles are measured with respect to the positive*x*axis. The elliptical arc runs positively (counter-clockwise) from*start-angle*to*end-angle*. The default for*start-angle*is 0; the default for*end-angle*is 2p.- In the case of a "filled arc" (that is, when
*filled*is**t**and*start-angle*or*end-angle*are supplied and are not 0 and 2p), the figure drawn is the "pie slice" area swept out by a line from the center of the ellipse to a point on the boundary as the boundary point moves from*start-angle*to*end-angle*. - When drawing unfilled ellipses, the current line style (see Section 3.2, "Using CLIM Drawing Options") affects the drawing in the obvious way, except that the joint shape has no effect. Dashed elliptical arcs start dashing at
*start-angle*.

- Arguments:
*sheet center-pt radius*`&key`

(filled**t***) start-angle end-angle ink clipping-region transformation line-style line-thickness line-unit line-dashes line-cap-shape*

- Arguments:
*sheet center-x center-y radius*`&key`

(filled

- Summary:
- These functions (structured and spread arguments, respectively) draw a circle (when
*filled*is**t**, the default) or a circular arc (when*filled*is**nil**) on the sheet*sheet*. The center of the circle is*center-pt*or (*center-x*,*center-y*) and the radius is*radius*. These are just special cases of**draw-ellipse**and**draw-ellipse***.*filled*is as for**draw-ellipse***. *start-angle*and*end-angle*allow the specification of an arc rather than a complete circle in the same manner as that of the ellipse functions.- The "filled arc" behavior is the same as that of an ellipse.

- Arguments:
*sheet string-or-char point*`&key`

text-style (start**0**) end (align-x**:left**) (align-y**:baseline***) toward-point transform-glyphs ink clipping-region transformation text-style text-family text-face text-size*

- Arguments:
*sheet string-or-char x y*`&key`

text-style (start**0**) end (align-x**:left**) (align-y**:baseline***) toward-x toward-y transform-glyphs ink clipping-region transformation text-style text-family text-face text-size*

- Summary:
- The text specified by
*string-or-char*is drawn on the sheet*sheet*starting at the position specified by the point*point*(or the position (*x, y*)). The exact definition of "starting at" depends on*align-x*and*align-y*.*align-x*is one of**:left**,**:center**, or**:right**.*align-y*is one of**:baseline**,**:top**,**:center**, or**:bottom**.*align-x*defaults to**:left**and*align-y*defaults to**:baseline**; with these defaults, the first glyph is drawn with its left edge and its baseline at*point*. *text-style*defaults to**nil**, meaning that the text will be drawn using the current text style of the sheet's medium.*start*and*end*specify the start and end of the string, in the case where*string-or-char*is a string. If*start*is supplied, it must be an integer that is less than the length of the string. If*end*is supplied, it must be an integer that is less than the length of the string, but greater than or equal to*start*.- Normally, glyphs are drawn from left to right no matter what transformation is in effect.
*toward-x*or*toward-y*(derived from*toward-point*in the case of**draw-text**) can be used to change the direction from one glyph to the next one. For example, if*toward-x*is less than the*x*position of*point*, then the glyphs will be drawn from right to left. If*toward-y*is greater than the*y*position of*point*, then the glyphs' baselines will be positioned one above another. More precisely, the reference point in each glyph lies on a line from*point*to*toward-point*, and the spacing of each glyph is determined by packing rectangles along that line, where each rectangle is "char-width" wide and "char-height" high. *transform-glyphs*is not supported in this version of CLIM.

CLIM 2.0 User's Guide - OCT 1998

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