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plotter_mod.bi
| Uploader: |  grindstone |
| Datum/Zeit: | 01.05.2015 11:02:28 |
/'
Copyright (c) 2014 by nemored
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Version 2014-08-05
---
The capabilities to quote the colour of the graph and to draw it without a coordinate cross
were added by grindstone in April 2015
'/
#include once "calculate.bi"
#include once "fbgfx.bi"
#ifndef PLOTTER_COLOR_AXIS
#define PLOTTER_COLOR_AXIS rgb(127, 127, 127)
#endif
#ifndef PLOTTER_COLOR_GRAPH
#define PLOTTER_COLOR_GRAPH rgb(255, 255, 255)
#endif
#ifndef PLOTTER_COLOR_BACKGROUND
#define PLOTTER_COLOR_BACKGROUND rgb(0, 0, 0)
#endif
declare function plotFunction overload(term as string, xStart as double, xEnd as double, yStart as double, yEnd as double, _
xWidth as integer, yWidth as integer, xStep as double = 1, _yStep as double = 1, _
gcolor As UInteger = PLOTTER_COLOR_GRAPH, nocc As Integer = 0) as FB.Image ptr
declare function plotFunction(img as FB.Image ptr, term as string, xStart as double, xEnd as double, _
yStart as double, yEnd as double, xStep as double = 1, yStep as double = 1, _
gcolor As UInteger = PLOTTER_COLOR_GRAPH, nocc As Integer = 0) as FB.Image ptr
function plotFunction(term as string, xStart as double, xEnd as double, yStart as double, yEnd as double, _
xWidth as integer, yWidth as integer, xStep as double = 1, yStep as double = 1, _
gcolor As UInteger = PLOTTER_COLOR_GRAPH, nocc as integer = 0) as FB.Image ptr
dim as FB.image ptr img = imagecreate(xWidth, yWidth, PLOTTER_COLOR_BACKGROUND)
return plotFunction(img, term, xStart, xEnd, yStart, yEnd, xStep, yStep, gcolor, nocc)
end function
function plotFunction(img as FB.Image ptr, term as string, xStart as double, xEnd as double, _
yStart as double, yEnd as double, xStep as double = 1, yStep as double = 1, _
gcolor As UInteger = PLOTTER_COLOR_GRAPH, nocc As Integer = 0) as FB.Image ptr
if xStep <= 0 or yStep <= 0 then draw string img, (1, 1), "ERROR", PLOTTER_COLOR_GRAPH : return img
' read image proportions
dim as integer xWidth, yWidth
if img = 0 then screeninfo xWidth, yWidth else imageinfo img, xWidth, yWidth
' coordinate system
dim as single xFactor = xWidth / (xEnd - xStart)
dim as single yFactor = yWidth / (yEnd - yStart)
dim as integer xAxis = yWidth + yWidth * yStart / (yEnd - yStart) - 1
dim as integer yAxis = - xStart * xFactor
if nocc = 0 then
if xAxis >= 0 and xAxis < yWidth then
line img, (0, xAxis)-(xWidth-1, xAxis), PLOTTER_COLOR_AXIS
line img, -step(-5, -5), PLOTTER_COLOR_AXIS
line img, step(5, 5)-step(-5, 5), PLOTTER_COLOR_AXIS
for i as integer = int(xStart) to int(xEnd)+1 step xStep
line img, ((i-xStart)*xFactor, xAxis-2)-step(0, 4), PLOTTER_COLOR_AXIS
next
end if
if yAxis >= 0 and yAxis < xWidth then
line img, (yAxis, yWidth-1)-(yAxis, 0), PLOTTER_COLOR_AXIS
line img, -step(-5, 5), PLOTTER_COLOR_AXIS
line img, step(5, -5)-step(5, 5), PLOTTER_COLOR_AXIS
for i as integer = int(yStart) to int(yEnd)+1 step yStep
line img, (yAxis-2, (i-yStart)*yFactor)-step(4, 0), PLOTTER_COLOR_AXIS
next
end If
endif
' graph
dim as double value, valueOld
valueOld = yEnd + 1
for i as integer = 0 to xWidth
value = Calculate.eval("x=" & (i-yAxis)/xFactor & ";" & term)
if Calculate.CalcError > 0 then
valueOld = yEnd + 1
else
if value > yStart and value <= yEnd then
if valueOld > yStart and valueOld <= yEnd then
'line img, -(i, xAxis - value*yFactor), PLOTTER_COLOR_GRAPH
line img, -(i, xAxis - value*yFactor), gcolor
else
'pset img, (i, xAxis - value*yFactor), PLOTTER_COLOR_GRAPH
pset img, (i, xAxis - value*yFactor), gcolor
end if
valueOld = value
end if
end if
next
if Calculate.CalcError > 0 and Calculate.CalcError <> Calculate.ErrorIllegalValue then
draw string img, (1, 1), "ERROR", PLOTTER_COLOR_GRAPH
end if
return img
end function