Failure on wand function: DrawPathEllipticArcAbsolute
Posted: 2010-07-09T09:44:49-07:00
When I use DrawPathEllipticArcAbsolute() for a small arcline which degree smaller than 40/360, nothing can be drew on the DrawingWand.
ImageMagick version: 6.6.3-0 (newest, but old version 6.5.3-6 works well)
Test C code:
ImageMagick version: 6.6.3-0 (newest, but old version 6.5.3-6 works well)
Test C code:
Code: Select all
#define RADIUS 50
#define DEG2RAD(d) (((float)(d)) / 180.0 * 3.14)
#include <MagickWand.h>
#include <math.h>
MagickWand *mgck_wnd;
DrawingWand *drw_wnd;
PixelWand *pxl_wnd;
void draw_sector(int sd, int ed)
{
// ox=100, oy=100, raidus = 50
int sx, sy, ex, ey;
sx = 100 + (int)(cos(DEG2RAD(sd)) * 50);
sy = 100 + (int)(sin(DEG2RAD(sd)) * 50);
ex = 100 + (int)(cos(DEG2RAD(ed)) * 50);
ey = 100 + (int)(sin(DEG2RAD(ed)) * 50);
// draw the secotr path
DrawPathStart(drw_wnd);
DrawPathMoveToAbsolute(drw_wnd, 100, 100);
DrawPathLineToAbsolute(drw_wnd, ex, ey);
DrawPathMoveToAbsolute(drw_wnd, 100, 100);
DrawPathLineToAbsolute(drw_wnd, sx, sy);
DrawPathEllipticArcAbsolute(drw_wnd, 50, 50, 0, (ed - sd) >= 180 ? MagickTrue : MagickFalse, MagickTrue, ex, ey);
DrawPathClose(drw_wnd);
DrawPathFinish(drw_wnd);
}
int main(int argc, char *argv[])
{
MagickWandGenesis();
mgck_wnd = NewMagickWand();
drw_wnd = NewDrawingWand();
pxl_wnd = NewPixelWand();
//
PixelSetColor(pxl_wnd, "red");
DrawSetFillColor(drw_wnd, pxl_wnd);
// try draw some sector (from 0 -> endDegree)
draw_sector(0, 30); // failure
draw_sector(40, 90); // OK!
draw_sector(90, 110); // failure
draw_sector(120, 200); // OK!
// create picture & drawing it
PixelSetColor(pxl_wnd, "white");
MagickNewImage(mgck_wnd, 200, 200, pxl_wnd);
MagickDrawImage(mgck_wnd, drw_wnd);
// output the image
MagickSetFormat(mgck_wnd, "GIF");
MagickWriteImagesFile(mgck_wnd, stdout);
// destroy
DestroyPixelWand(pxl_wnd);
DestroyDrawingWand(drw_wnd);
DestroyMagickWand(mgck_wnd);
MagickWandTerminus();
exit(0);
}