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163 lines
6.4 KiB
Plaintext
163 lines
6.4 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
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{{QBDLTIME:23:15:52}}
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The '''PSET''' grahics [[SCREEN (statement)|SCREEN]] statement sets a pixel to a coordinate with a default or designated color attribute.
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{{PageSyntax}}
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:: '''PSET''' [STEP]'''('''''column%'', ''row%''''')'''[, ''colorAttribute'']
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''[[Parameters]]:''
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* Can use [[STEP]] relative graphics coordinates from a previous graphic object.
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* ''Column'' and ''row'' can be literal or variable [[INTEGER]] coordinates values which can be offscreen.
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* If the ''colorAttribute'' is omitted, PSET will use the current [[_DEST|destination]] page's _DEFAULTCOLOR.
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''Usage:''
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* ''Color attributes'' are limited to the SCREEN mode used. Any color value other than 0 will be white in [[SCREEN (statement)|SCREEN]]s 2 or 11.
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* PSET can locate other graphics objects and color [[DRAW]] statements.
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* The PSET action can be used in a graphics [[PUT (graphics statement)|PUT]] to produce an identical image on any background.
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* The graphic cursor is set to the center of the program window on program start for [[STEP]] relative coordinates.
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* '''PSET can be used in any graphic screen mode, but cannot be used in the default screen mode 0 as it is text only! (Or in any _NEWIMAGE(x, y, 0) screens which are text only as well.)'''
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''Example:'' Using PSET to locate and color a [[DRAW]] statement.
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{{CodeStart}}
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SCREEN 12
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{{Cl|PSET}}(100, 100), 12
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{{Cl|DRAW}} "U20 R20 D20 L20"
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{{CodeEnd}}
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:''Screen results:'' A drawn box that is bright red.
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''Example 2:'' Magnifying a box portion of a Mandelbrot image with PSET
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{{CodeStart}}
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{{Cl|DEFSTR}} A-Z
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{{Cl|DIM}} red(15) {{Cl|AS}} {{Cl|INTEGER}}, green(15) {{Cl|AS}} {{Cl|INTEGER}}, blue(15) {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|DIM}} i {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|SCREEN}} 12
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 15: {{Cl|READ}} red(i): {{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 15: {{Cl|READ}} green(i): {{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 15: {{Cl|READ}} blue(i): {{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 15: {{Cl|PALETTE}} i, 65536 * blue(i) + 256& * green(i) + red(i): {{Cl|NEXT}}
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{{Cl|DATA}} 0,63,63,63,63,63,31, 0, 0,31,31,31,47,63,63,63
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{{Cl|DATA}} 0, 0,15,31,47,63,63,63,63,31,15, 0, 0, 0, 0, 0
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{{Cl|DATA}} 0, 0, 0, 0, 0, 0, 0, 0,31,63,63,63,63,63,42,21
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{{Cl|DIM}} dmag {{Cl|AS}} {{Cl|INTEGER}}, dlogmag {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|DIM}} a {{Cl|AS}} {{Cl|DOUBLE}}, b {{Cl|AS}} {{Cl|DOUBLE}}, mag {{Cl|AS}} {{Cl|DOUBLE}}
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{{Cl|DIM}} dx {{Cl|AS}} {{Cl|INTEGER}}, dy {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|DIM}} mx {{Cl|AS}} {{Cl|INTEGER}}, my {{Cl|AS}} {{Cl|INTEGER}}, mz {{Cl|AS}} {{Cl|INTEGER}}
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dmag = 16
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mag = 1
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a = -.75
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b = 0
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DO
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{{Cl|DIM}} limitx {{Cl|AS}} {{Cl|DOUBLE}}, limit {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|DIM}} inc {{Cl|AS}} {{Cl|DOUBLE}}, left {{Cl|AS}} {{Cl|DOUBLE}}, top {{Cl|AS}} {{Cl|DOUBLE}}
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limitx = 150 * ({{Cl|LOG}}(mag) + 1)
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{{Cl|IF...THEN|IF}} limitx > 32767 {{Cl|THEN}} limitx = 32767
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limit = {{Cl|INT}}(limitx)
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inc = .004 / mag
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left = a - inc * 319
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top = b + inc * 239
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{{Cl|CLS}}
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{{Cl|DIM}} yy {{Cl|AS}} {{Cl|INTEGER}}, xx {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|DIM}} x {{Cl|AS}} {{Cl|DOUBLE}}, y {{Cl|AS}} {{Cl|DOUBLE}}, z {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|FOR...NEXT|FOR}} yy = 0 {{Cl|TO}} 479
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y = top - inc * yy
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{{Cl|FOR...NEXT|FOR}} xx = 0 {{Cl|TO}} 639
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x = left + inc * xx
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z = mandel(x, y, limit)
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{{Cl|IF...THEN|IF}} z < limit {{Cl|THEN}} {{Cl|PSET}} (xx, yy), 1 + z {{Cl|MOD}} 15
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{{Cl|IF...THEN|IF}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27) {{Cl|THEN}} {{Cl|SYSTEM}}
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{{Cl|NEXT}}
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{{Cl|NEXT}}
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mz = 0
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{{Cl|CALL}} readmouse(mx, my, mz)
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DO
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dx = 319 \ dmag
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dy = 239 \ dmag
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{{Cl|CALL}} readmouse(mx, my, mz)
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{{Cl|IF...THEN|IF}} mz {{Cl|THEN}} {{Cl|EXIT DO}}
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{{Cl|CALL}} rectangle(mx - dx, my - dy, mx + dx, my + dy)
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{{Cl|DIM}} t {{Cl|AS}} {{Cl|DOUBLE}}
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t = {{Cl|TIMER}}
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{{Cl|WHILE}} t = {{Cl|TIMER}}
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key$ = {{Cl|INKEY$}}
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{{Cl|SELECT CASE}} key$
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{{Cl|CASE}} {{Cl|CHR$}}(27)
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{{Cl|SYSTEM}}
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{{Cl|CASE}} {{Cl|CHR$}}(0) + {{Cl|CHR$}}(72)
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dmag = dmag \ 2
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{{Cl|IF...THEN|IF}} dmag < 2 {{Cl|THEN}} dmag = 2
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{{Cl|CASE}} {{Cl|CHR$}}(0) + {{Cl|CHR$}}(80)
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dmag = dmag * 2
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{{Cl|IF...THEN|IF}} dmag > 128 {{Cl|THEN}} dmag = 128
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{{Cl|END SELECT}}
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{{Cl|WEND}}
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{{Cl|CALL}} rectangle(mx - dx, my - dy, mx + dx, my + dy)
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{{Cl|LOOP}}
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a = a + inc * (mx - 319): b = b - inc * (my - 239)
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{{Cl|IF...THEN|IF}} (mz = 1) {{Cl|THEN}} mag = dmag * mag {{Cl|ELSE}} mag = mag / dmag
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{{Cl|IF...THEN|IF}} (mag < 1) {{Cl|THEN}} mag = 1
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{{Cl|LOOP}}
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{{Cl|FUNCTION}} mandel% (x {{Cl|AS}} {{Cl|DOUBLE}}, y {{Cl|AS}} {{Cl|DOUBLE}}, limit {{Cl|AS}} {{Cl|INTEGER}})
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{{Cl|DIM}} a {{Cl|AS}} {{Cl|DOUBLE}}, b {{Cl|AS}} {{Cl|DOUBLE}}, t {{Cl|AS}} {{Cl|DOUBLE}}
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{{Cl|DIM}} n {{Cl|AS}} {{Cl|INTEGER}}
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n = 0: a = 0: b = 0
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DO
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t = a * a - b * b + x
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b = 2 * a * b + y: a = t
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n = n + 1
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{{Cl|LOOP}} {{Cl|UNTIL}} a * a + b * b > 4 {{Cl|OR (boolean)|OR}} n > limit
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mandel = n
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{{Cl|END FUNCTION}}
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{{Cl|SUB}} readmouse (x {{Cl|AS}} {{Cl|INTEGER}}, y {{Cl|AS}} {{Cl|INTEGER}}, z {{Cl|AS}} {{Cl|INTEGER}})
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z=0
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DO
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if {{Cl|_MOUSEBUTTON}}(1) {{Cl|THEN}} z = z {{Cl|OR (boolean)|OR}} 1
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if {{Cl|_MOUSEBUTTON}}(2) {{Cl|THEN}} z = z {{Cl|OR (boolean)|OR}} 2
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if {{Cl|_MOUSEBUTTON}}(3) {{Cl|THEN}} z = z {{Cl|OR (boolean)|OR}} 4
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|_MOUSEINPUT}}=0
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x={{Cl|_MOUSEX}}
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y={{Cl|_MOUSEY}}
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{{Cl|END SUB}}
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{{Cl|SUB}} rectangle (x1 {{Cl|AS}} {{Cl|INTEGER}}, y1 {{Cl|AS}} {{Cl|INTEGER}}, x2 {{Cl|AS}} {{Cl|INTEGER}}, y2 {{Cl|AS}} {{Cl|INTEGER}})
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{{Cl|DIM}} i {{Cl|AS}} {{Cl|INTEGER}}, j {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|FOR...NEXT|FOR}} i = x1 {{Cl|TO}} x2
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j = {{Cl|POINT}}(i, y1)
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{{Cl|PSET}} (i, y1), j {{Cl|XOR (boolean)|XOR}} 15
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j = {{Cl|POINT}}(i, y2)
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{{Cl|PSET}} (i, y2), j {{Cl|XOR (boolean)|XOR}} 15
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{{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} i = y1 {{Cl|TO}} y2
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j = {{Cl|POINT}}(x1, i)
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{{Cl|PSET}} (x1, i), j {{Cl|XOR (boolean)|XOR}} 15
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j = {{Cl|POINT}}(x2, i)
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{{Cl|PSET}} (x2, i), j {{Cl|XOR (boolean)|XOR}} 15
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{{Cl|NEXT}}
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{{Cl|END SUB}}
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{{CodeEnd}} {{small|Code by Codeguy}}
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: ''Notes:'' Left click, to zoom in on the rectangle. Right click, to zoom out. Up arrow makes the rectangle bigger and down arrow makes the rectangle smaller.
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''See also:''
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* [[PRESET]], [[CIRCLE]], [[LINE]]
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* [[COLOR]], [[POINT]]
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* [[PUT (graphics statement)]]
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* [[GET (graphics statement)]]
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* [[Text Using Graphics]] (Demo)
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{{PageNavigation}}
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