Manual Reference Pages - draw2 (3)
NAME
draw2(3f) - [M_draw:DRAW] Draw from current graphics position to given point (x, y) (LICENSE:PD)
CONTENTS
Synopsis
Description
Options
Example
SYNOPSIS
subroutine draw2(x, y) real,intent(in) :: x, y
DESCRIPTION
Draw from current position to specified point using current color and line width. Updates current position to new point. (x, y) is a point in world coordinates.
OPTIONS
X new X position Y new Y position
EXAMPLE
Sample program:
program demo_draw2 use M_draw, only : prefsize, vinit, ortho2, clear, getkey use M_draw, only : move2, draw2, vexit, color,linewidth use M_draw, only : D_BLACK, D_WHITE use M_draw, only : D_RED, D_GREEN, D_BLUE use M_draw, only : D_YELLOW, D_MAGENTA, D_CYAN use M_units, only : d2r, polar_to_cartesian ! ! The Archimedean spiral is the locus of points corresponding ! to the locations over time of a point moving away from a ! fixed point with a constant speed along a line which rotates ! with constant angular velocity. ! r=A+B*theta ! Changing the parameter A will turn the spiral, ! while B controls the distance between successive turnings. ! implicit none integer :: i real :: x,y,radius,theta real,parameter :: rotate=0.0, gap=2.0 integer :: ipawscall prefsize(400,400) call vinit(’ ’) ! start graphics using device $M_DRAW_DEVICE call ortho2(-150.0,150.0,-150.0,150.0) call color(D_MAGENTA) call clear() call move2(0.0,0.0) call color(D_BLACK) call linewidth(40) do i=0,360*10,5 theta=d2r(i) ! equation in polar coordinates radius=rotate+gap*theta ! convert polar coordinates to cartesian call polar_to_cartesian(radius,theta,x,y) ! draw from current position to end of next segment call draw2(x,y) enddo ipaws=getkey() ! exit graphics mode call vexit() end program demo_draw2
| draw2 (3) | March 11, 2021 |
