1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Coordinate System</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<h2 align="center">Coordinate System</h2>
<pre class="function"><span class="mainFunction">void <a name="cdGetCanvasSize">cdCanvasGetSize</a>(cdCanvas* canvas, int *width, int *height, double *width_mm, double *height_mm); [in C]</span>
canvas:GetSize() -> (width, height, mm_width, mm_height: number) [in Lua]</pre>
<p>Returns the canvas size in pixels and in millimeters. You can provide only
the desired values and <font>NULL</font> for the others.</p>
<pre class="function"><span class="mainFunction">int <a name="cdUpdateYAxis">cdCanvasUpdateYAxis</a>(cdCanvas* canvas, int *y); [in C]</span>
double cdfCanvasUpdateYAxis(cdCanvas* canvas, double *y); [in C]
int cdCanvasInvertYAxis(cdCanvas* canvas, int y); [in C]
double cdfCanvasInvertYAxis(cdCanvas* canvas, double y); [in C]
canvas:UpdateYAxis(yc: number) -> (yr: number) [in Lua]
canvas:InvertYAxis(yc: number) -> (yr: number) [in Lua]</pre>
<p>In some graph systems, the origin is at the upper left corner of the
canvas, with the direction of the Y axis pointing down. In this case, the
function converts the coordinate system of the CD library into the internal
system of the active canvas' driver, and the other way round. If this is not
the case, nothing happens. This is just <font>"y = height-1 -
y"</font>. It returns the changed value. The "Invert" will always invert
the given value, the "Update" function will invert only if the canvas has the
Y axis inverted.</p>
<pre class="function"><span class="mainFunction">void cdCanvasMM2Pixel(cdCanvas* canvas, double mm_dx, double mm_dy, int *dx, int *dy); [in C]</span>
void cdfCanvasMM2Pixel(cdCanvas* canvas, double mm_dx, double mm_dy, double *dx, double *dy); [in C]
canvas:MM2Pixel(mm_dx, mm_dy: number) -> (dx, dy: number) [in Lua]
canvas:fMM2Pixel(mm_dx, mm_dy: number) -> (dx, dy: number) [in Lua]</pre>
<p>Converts sizes in millimeters into pixels (canvas coordinates). You can
provide only the desired values and <font>NULL</font> for the
others.</p>
<pre class="function"><span class="mainFunction">void cdCanvasPixel2MM(cdCanvas* canvas, int dx, int dy, double *mm_dx, double *mm_dy); [in C]</span>
void cdfCanvasPixel2MM(cdCanvas* canvas, double dx, double dy, double *mm_dx, double *mm_dy); [in C]
canvas:Pixel2MM(dx, dy: number) -> (mm_dx, mm_dy: number) [in Lua]
canvas:fPixel2MM(dx, dy: number) -> (mm_dx, mm_dy: number) [in Lua]</pre>
<p>Converts sizes in pixels (canvas coordinates) into millimeters. You can
provide only the desired values and <font>NULL</font> for the
others. Use this function to obtain the horizontal and vertical resolution of
the canvas by passing 1 as parameter in <font>dx</font> and
<font>dy</font>. The resolution value is obtained using the
formula <strong><font>res=1.0/mm</font></strong>.</p>
<pre class="function"><span class="mainFunction">void cdCanvasOrigin(cdCanvas* canvas, int x, int y); [in C]</span>
void cdfCanvasOrigin(cdCanvas* canvas, double x, double y); [in C]
canvas:Origin(x, y: number) [in Lua]
canvas:fOrigin(x, y: number) [in Lua]</pre>
<p>Allows translating the origin - for instance, to the center of the canvas.
The function profits from the architecture of the library to simulate a
translation of the origin, which in fact is never actually passed to the
canvas in the respective driver. Default values: (0, 0)</p>
<pre class="function"><span class="mainFunction">void cdCanvasGetOrigin(cdCanvas* canvas, int *x, int *y); [in C]</span>
void cdfCanvasGetOrigin(cdCanvas* canvas, double *x, double *y); [in C]
canvas:GetOrigin() -> (x, y: number) [in Lua]
canvas:fGetOrigin() -> (x, y: number) [in Lua]</pre>
<p>Returns the origin.</p>
<h3>Transformation Matrix</h3>
<pre class="function"><span class="mainFunction">void <a name="cdTransform">cdCanvasTransform</a>(cdCanvas* canvas, const double* matrix); [in C]</span>
canvas:Transform(matrix: table) [in Lua]</pre>
<p>Defines a transformation matrix with 6 elements. If the matrix is NULL,
the
transformation is reset to the identity. Default value: NULL.</p>
<p>The matrix contains scale, rotation and translation elements as follows:</p>
<pre>|x'| |sx*cos(angle) -sin(angle) dx| |x| |0 2 4|
|y'| = | sin(angle) sy*cos(angle) dy| * |y| with indices |1 3 5|
|1|</pre>
<p>But notice that the indices are different of the <strong>
cdCanvasVectorTextTransform</strong>.</p>
<p>Functions that retrieve images from the canvas are not affected by the
transformation matrix, such as <strong>GetImage</strong>, <strong>GetImageRGB</strong>
and <strong>ScrollArea</strong>.</p>
<p>Transformation matrix is independent of the <strong>World Coordinate</strong>
and <strong>Origin</strong>
functions. And those are affected if a transformation is set, just like other
regular primitives.</p>
<pre class="function"><span class="mainFunction">double* <a name="cdGetTransform">cdCanvasGetTransform</a>(cdCanvas* canvas); [in C]</span>
canvas:GetTransformation() -> (matrix: table) [in Lua]</pre>
<p>Returns the transformation matrix. If the identity is set, returns NULL.</p>
<pre class="function"><span class="mainFunction">void <a name="cdTransformMultiply">cdCanvasTransforMultiply</a>(cdCanvas* canvas, const double* matrix); [in C]</span>
canvas:TransformMultiply(matrix: table) [in Lua]</pre>
<p>Left multiply the current transformation by the given transformation.</p>
<pre class="function"><span class="mainFunction">void <a name="cdTransformTranslate">cdCanvasTransformTranslate</a>(cdCanvas* canvas, double dx, double dy); [in C]</span>
canvas:TransformTranslate(dx, dy: number) [in Lua]</pre>
<p>Applies a translation to the current transformation.</p>
<pre class="function"><span class="mainFunction">void <a name="cdTransformScale">cdCanvasTransformScale</a>(cdCanvas* canvas, double sx, double sy); [in C]</span>
canvas:TransformScale(sx, sy: number) [in Lua]</pre>
<p>Applies a scale to the current transformation.</p>
<pre class="function"><span class="mainFunction">void <a name="cdTransformRotate">cdCanvasTransformRotate</a>(cdCanvas* canvas, double angle); [in C]</span>
canvas:TransformRotate(angle: number) [in Lua]</pre>
<p>Applies a rotation to the current transformation. Angle is in degrees,
oriented counter-clockwise from the horizontal axis.</p>
<pre class="function"><span class="mainFunction">void <a name="cdTransformPoint">cdCanvasTransformPoint</a>(cdCanvas* canvas, int x, int y, int *tx, int *ty); [in C]</span>
void cdfCanvasTransformPoint(cdCanvas* canvas, double x, double y, double *tx, double *ty); [in C]
canvas:TransformPoint(x, y: number) -> (tx, ty: number) [in Lua]
canvas:fTransformPoint(x, y: number) -> (tx, ty: number) [in Lua]</pre>
<p>Applies a transformation to a given point.</p>
</body>
</html>
|
