15c6c1daeSBarry Smith 25c6c1daeSBarry Smith #include <petscdraw.h> /*I "petscdraw.h" I*/ 35c6c1daeSBarry Smith 45c6c1daeSBarry Smith #undef __FUNCT__ 55c6c1daeSBarry Smith #define __FUNCT__ "PetscDrawZoom" 65c6c1daeSBarry Smith /*@C 75c6c1daeSBarry Smith PetscDrawZoom - Allows one to create a graphic that users may zoom into. 85c6c1daeSBarry Smith 95c6c1daeSBarry Smith Collective on PetscDraw 105c6c1daeSBarry Smith 115c6c1daeSBarry Smith Input Parameters: 125c6c1daeSBarry Smith + draw - the window where the graph will be made. 135c6c1daeSBarry Smith . func - users function that draws the graphic 145c6c1daeSBarry Smith - ctx - pointer to any user required data 155c6c1daeSBarry Smith 165c6c1daeSBarry Smith Level: advanced 175c6c1daeSBarry Smith 185c6c1daeSBarry Smith Concepts: graphics^zooming 195c6c1daeSBarry Smith Concepts: drawing^zooming 205c6c1daeSBarry Smith Concepts: zooming^in graphics 215c6c1daeSBarry Smith 225c6c1daeSBarry Smith .seealso: 235c6c1daeSBarry Smith @*/ 245c6c1daeSBarry Smith PetscErrorCode PetscDrawZoom(PetscDraw draw,PetscErrorCode (*func)(PetscDraw,void*),void *ctx) 255c6c1daeSBarry Smith { 265c6c1daeSBarry Smith PetscErrorCode ierr; 275c6c1daeSBarry Smith PetscDrawButton button; 285c6c1daeSBarry Smith PetscReal dpause,xc,yc,scale = 1.0,w,h,xr,xl,yr,yl,xmin,xmax,ymin,ymax; 295c6c1daeSBarry Smith PetscBool isnull; 305c6c1daeSBarry Smith 315c6c1daeSBarry Smith PetscFunctionBegin; 325c6c1daeSBarry Smith ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 335c6c1daeSBarry Smith if (isnull) PetscFunctionReturn(0); 345c6c1daeSBarry Smith 355c6c1daeSBarry Smith ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr); 365c6c1daeSBarry Smith ierr = PetscDrawSynchronizedClear(draw);CHKERRQ(ierr); 37*e118a51fSLisandro Dalcin ierr = PetscDrawCollectiveBegin(draw);CHKERRQ(ierr); 385c6c1daeSBarry Smith ierr = (*func)(draw,ctx);CHKERRQ(ierr); 39*e118a51fSLisandro Dalcin ierr = PetscDrawCollectiveEnd(draw);CHKERRQ(ierr); 405c6c1daeSBarry Smith ierr = PetscDrawSynchronizedFlush(draw);CHKERRQ(ierr); 415c6c1daeSBarry Smith 425c6c1daeSBarry Smith ierr = PetscDrawGetPause(draw,&dpause);CHKERRQ(ierr); 435c6c1daeSBarry Smith if (dpause >= 0) { 445c6c1daeSBarry Smith ierr = PetscSleep(dpause);CHKERRQ(ierr); 455c6c1daeSBarry Smith goto theend; 465c6c1daeSBarry Smith } 475c6c1daeSBarry Smith if (dpause != -1) goto theend; 485c6c1daeSBarry Smith 495c6c1daeSBarry Smith ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr); 505c6c1daeSBarry Smith ierr = PetscDrawSynchronizedGetMouseButton(draw,&button,&xc,&yc,0,0);CHKERRQ(ierr); 515c6c1daeSBarry Smith ierr = PetscDrawGetCoordinates(draw,&xl,&yl,&xr,&yr);CHKERRQ(ierr); 52*e118a51fSLisandro Dalcin w = xr - xl; xmin = xl; xmax = xr; 53*e118a51fSLisandro Dalcin h = yr - yl; ymin = yl; ymax = yr; 545c6c1daeSBarry Smith 55*e118a51fSLisandro Dalcin while (button != PETSC_BUTTON_NONE && button != PETSC_BUTTON_RIGHT) { 565c6c1daeSBarry Smith ierr = PetscDrawSynchronizedClear(draw);CHKERRQ(ierr); 575c6c1daeSBarry Smith if (button == PETSC_BUTTON_LEFT) scale = .5; 585c6c1daeSBarry Smith else if (button == PETSC_BUTTON_CENTER) scale = 2.; 595c6c1daeSBarry Smith xl = scale*(xl + w - xc) + xc - w*scale; 605c6c1daeSBarry Smith xr = scale*(xr - w - xc) + xc + w*scale; 615c6c1daeSBarry Smith yl = scale*(yl + h - yc) + yc - h*scale; 625c6c1daeSBarry Smith yr = scale*(yr - h - yc) + yc + h*scale; 635c6c1daeSBarry Smith w *= scale; h *= scale; 645c6c1daeSBarry Smith ierr = PetscDrawSetCoordinates(draw,xl,yl,xr,yr);CHKERRQ(ierr); 65*e118a51fSLisandro Dalcin ierr = PetscDrawCollectiveBegin(draw);CHKERRQ(ierr); 665c6c1daeSBarry Smith ierr = (*func)(draw,ctx);CHKERRQ(ierr); 67*e118a51fSLisandro Dalcin ierr = PetscDrawCollectiveEnd(draw);CHKERRQ(ierr); 685c6c1daeSBarry Smith ierr = PetscDrawSynchronizedFlush(draw);CHKERRQ(ierr); 695c6c1daeSBarry Smith ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr); 705c6c1daeSBarry Smith ierr = PetscDrawSynchronizedGetMouseButton(draw,&button,&xc,&yc,0,0);CHKERRQ(ierr); 715c6c1daeSBarry Smith } 725c6c1daeSBarry Smith ierr = PetscDrawSetCoordinates(draw,xmin,ymin,xmax,ymax);CHKERRQ(ierr); 735c6c1daeSBarry Smith theend: 745c6c1daeSBarry Smith PetscFunctionReturn(0); 755c6c1daeSBarry Smith } 765c6c1daeSBarry Smith 77