/*******************************/ /* class_pad_draw_function.cpp */ /*******************************/ #include "fctsys.h" #include "gr_basic.h" #include "common.h" #include "trigo.h" #include "pcbnew_id.h" // ID_TRACK_BUTT #include "class_drawpanel.h" #include "drawtxt.h" #include "pcbnew.h" #include "class_board_design_settings.h" #include "colors_selection.h" /* uncomment this line to show this pad with its specfic size and color * when it is not on copper layers, and only one solder mask layer or solder paste layer * is displayed for this pad * After testing this feature,I am not sure this is a good idea * but the code is left here. */ //#define SHOW_PADMASK_REAL_SIZE_AND_COLOR // Helper class to store parameters used to draw a pad PAD_DRAWINFO::PAD_DRAWINFO() { m_DrawPanel = NULL; m_DrawMode = 0; m_Color = BLACK; m_HoleColor = BLACK; // could be DARKGRAY; m_PadClearance = 0; m_Display_padnum = true; m_Display_netname = true; m_ShowPadFilled = true; m_ShowNCMark = true; #ifndef USE_WX_ZOOM m_Scale = 1.0; #endif m_IsPrinting = false; } /** Draw a pad: * @param aDC = device context * @param aDraw_mode = mode: GR_OR, GR_XOR, GR_AND... * @param aOffset = draw offset */ void D_PAD::Draw( WinEDA_DrawPanel* aPanel, wxDC* aDC, int aDraw_mode, const wxPoint& aOffset ) { int color = 0; wxSize mask_margin; // margin (clearance) used for some non copper layers int showActualMaskSize = 0; /* == layer number if the actual pad size on mask layer can be displayed * i.e. if only one layer is shown for this pad * and this layer is a mask (solder mask or sloder paste */ if( m_Flags & DO_NOT_DRAW ) return; PAD_DRAWINFO drawInfo; drawInfo.m_Offset = aOffset; /* We can show/hide pads from the layer manager. * options are show/hide pads on front and/or back side of the board * For through pads, we hide them only if both sides are hidden. * smd pads on back are hidden for all layers (copper and technical layers) * on back side of the board * smd pads on front are hidden for all layers (copper and technical layers) * on front side of the board * ECO, edge and Draw layers and not considered */ // Mask layers for Back side of board #define BACK_SIDE_LAYERS \ (LAYER_BACK | ADHESIVE_LAYER_BACK | SOLDERPASTE_LAYER_BACK \ | SILKSCREEN_LAYER_BACK | SOLDERMASK_LAYER_BACK) // Mask layers for Front side of board #define FRONT_SIDE_LAYERS \ (LAYER_FRONT | ADHESIVE_LAYER_FRONT | SOLDERPASTE_LAYER_FRONT \ | SILKSCREEN_LAYER_FRONT | SOLDERMASK_LAYER_FRONT) BOARD* brd = GetBoard(); bool frontVisible = brd->IsElementVisible( PCB_VISIBLE( PAD_FR_VISIBLE ) ); bool backVisible = brd->IsElementVisible( PCB_VISIBLE( PAD_BK_VISIBLE ) ); if( !frontVisible && !backVisible ) return; /* If pad are only on front side (no layer on back side) * and if hide front side pads is enabled, do not draw */ if( !frontVisible && ( (m_Masque_Layer & BACK_SIDE_LAYERS) == 0 ) ) return; /* If pad are only on back side (no layer on front side) * and if hide back side pads is enabled, do not draw */ if( !backVisible && ( (m_Masque_Layer & FRONT_SIDE_LAYERS) == 0 ) ) return; WinEDA_BasePcbFrame* frame = (WinEDA_BasePcbFrame*) aPanel->GetParent(); PCB_SCREEN* screen = frame->GetScreen(); if( frame->m_DisplayPadFill == FILLED ) drawInfo.m_ShowPadFilled = true; else drawInfo.m_ShowPadFilled = false; if( m_Masque_Layer & LAYER_FRONT ) { color = brd->GetVisibleElementColor( PAD_FR_VISIBLE ); } if( m_Masque_Layer & LAYER_BACK ) { color |= brd->GetVisibleElementColor( PAD_BK_VISIBLE ); } if( color == 0 ) /* Not on copper layer */ { // If the pad in on only one tech layer, use the layer color // else use DARKGRAY int mask_non_copper_layers = m_Masque_Layer & ~ALL_CU_LAYERS; #ifdef SHOW_PADMASK_REAL_SIZE_AND_COLOR mask_non_copper_layers &= brd->GetVisibleLayers(); #endif switch( mask_non_copper_layers ) { case 0: break; case ADHESIVE_LAYER_BACK: color = brd->GetLayerColor( ADHESIVE_N_BACK ); break; case ADHESIVE_LAYER_FRONT: color = brd->GetLayerColor( ADHESIVE_N_FRONT ); break; case SOLDERPASTE_LAYER_BACK: color = brd->GetLayerColor( SOLDERPASTE_N_BACK ); showActualMaskSize = SOLDERPASTE_N_BACK; break; case SOLDERPASTE_LAYER_FRONT: color = brd->GetLayerColor( SOLDERPASTE_N_FRONT ); showActualMaskSize = SOLDERPASTE_N_FRONT; break; case SILKSCREEN_LAYER_BACK: color = brd->GetLayerColor( SILKSCREEN_N_BACK ); break; case SILKSCREEN_LAYER_FRONT: color = brd->GetLayerColor( SILKSCREEN_N_FRONT ); break; case SOLDERMASK_LAYER_BACK: color = brd->GetLayerColor( SOLDERMASK_N_BACK ); showActualMaskSize = SOLDERMASK_N_BACK; break; case SOLDERMASK_LAYER_FRONT: color = brd->GetLayerColor( SOLDERMASK_N_FRONT ); showActualMaskSize = SOLDERMASK_N_FRONT; break; case DRAW_LAYER: color = brd->GetLayerColor( DRAW_N ); break; case COMMENT_LAYER: color = brd->GetLayerColor( COMMENT_N ); break; case ECO1_LAYER: color = brd->GetLayerColor( ECO1_N ); break; case ECO2_LAYER: color = brd->GetLayerColor( ECO2_N ); break; case EDGE_LAYER: color = brd->GetLayerColor( EDGE_N ); break; default: color = DARKGRAY; break; } } // if PAD_SMD pad and high contrast mode if( ( m_Attribut == PAD_SMD || m_Attribut == PAD_CONN ) && DisplayOpt.ContrastModeDisplay ) { // when routing tracks if( frame && frame->m_ID_current_state == ID_TRACK_BUTT ) { int routeTop = screen->m_Route_Layer_TOP; int routeBot = screen->m_Route_Layer_BOTTOM; // if routing between copper and component layers, // or the current layer is one of said 2 external copper layers, // then highlight only the current layer. if( ( ( 1 << routeTop ) | ( 1 << routeBot ) ) == ( LAYER_BACK | LAYER_FRONT ) || ( ( 1 << screen->m_Active_Layer ) & ( LAYER_BACK | LAYER_FRONT ) ) ) { if( !IsOnLayer( screen->m_Active_Layer ) ) { color &= ~MASKCOLOR; color |= DARKDARKGRAY; } } // else routing between an internal signal layer and some other // layer. Grey out all PAD_SMD pads not on current or the single // selected external layer. else if( !IsOnLayer( screen->m_Active_Layer ) && !IsOnLayer( routeTop ) && !IsOnLayer( routeBot ) ) { color &= ~MASKCOLOR; color |= DARKDARKGRAY; } } // when not edting tracks, show PAD_SMD components not on active layer // as greyed out else { if( !IsOnLayer( screen->m_Active_Layer ) ) { color &= ~MASKCOLOR; color |= DARKDARKGRAY; } } } #ifdef SHOW_PADMASK_REAL_SIZE_AND_COLOR if( showActualMaskSize ) { switch( showActualMaskSize ) { case SOLDERMASK_N_BACK: case SOLDERMASK_N_FRONT: mask_margin.x = mask_margin.y = GetSolderMaskMargin(); break; case SOLDERPASTE_N_BACK: case SOLDERPASTE_N_FRONT: mask_margin = GetSolderPasteMargin(); break; default: break; } } #endif // if Contrast mode is ON and a technical layer active, show pads on this // layer so we can see pads on paste or solder layer and the size of the // mask if( DisplayOpt.ContrastModeDisplay && screen->m_Active_Layer > LAST_COPPER_LAYER ) { if( IsOnLayer( screen->m_Active_Layer ) ) { color = brd->GetLayerColor( screen->m_Active_Layer ); // In hight contrast mode, and if the active layer is the mask // layer shows the pad size with the mask clearance switch( screen->m_Active_Layer ) { case SOLDERMASK_N_BACK: case SOLDERMASK_N_FRONT: mask_margin.x = mask_margin.y = GetSolderMaskMargin(); break; case SOLDERPASTE_N_BACK: case SOLDERPASTE_N_FRONT: mask_margin = GetSolderPasteMargin(); break; default: break; } } else color = DARKDARKGRAY; } if( aDraw_mode & GR_SURBRILL ) { if( aDraw_mode & GR_AND ) color &= ~HIGHT_LIGHT_FLAG; else color |= HIGHT_LIGHT_FLAG; } if( color & HIGHT_LIGHT_FLAG ) color = ColorRefs[color & MASKCOLOR].m_LightColor; bool DisplayIsol = DisplayOpt.DisplayPadIsol; if( ( m_Masque_Layer & ALL_CU_LAYERS ) == 0 ) DisplayIsol = FALSE; drawInfo.m_DrawMode = aDraw_mode; drawInfo.m_Color = color; drawInfo.m_DrawPanel = aPanel; drawInfo.m_Mask_margin = mask_margin; drawInfo.m_ShowNCMark = brd->IsElementVisible( PCB_VISIBLE( NO_CONNECTS_VISIBLE ) ); drawInfo.m_IsPrinting = screen->m_IsPrinting; #ifndef USE_WX_ZOOM drawInfo.m_Scale = (double) screen->Scale( 1000 ) / 1000; #endif SetAlpha( &color, 170 ); /* Get the pad clearance. This has a meaning only for Pcbnew. * for Cvpcb (and Gerbview) GetClearance() creates debug errors because * there is no net classes so a call to GetClearance() is made only when * needed (never needed in Cvpcb nor in Gerbview) */ drawInfo.m_PadClearance = DisplayIsol ? GetClearance() : 0; /* Draw the pad number */ if( frame && !frame->m_DisplayPadNum ) drawInfo.m_Display_padnum = false; if( ( DisplayOpt.DisplayNetNamesMode == 0 ) || ( DisplayOpt.DisplayNetNamesMode == 2 ) ) drawInfo.m_Display_netname = false; // Display net names is restricted to pads that are on the active layer // in cotranst mode displae if( !IsOnLayer( screen->m_Active_Layer ) && DisplayOpt.ContrastModeDisplay ) drawInfo.m_Display_netname = false; DrawShape( &aPanel->m_ClipBox, aDC, drawInfo ); } /** function DrawShape * basic function to draw a pad. * used by D_PAD::Draw after calculation of parameters (color, final orientation ...) * this function can be called to draw a pad on a panel * even if this panel is not a WinEDA_DrawPanel (for instance on a wxPanel inside the pad editor) */ void D_PAD::DrawShape( EDA_Rect* aClipBox, wxDC* aDC, PAD_DRAWINFO& aDrawInfo ) { wxPoint coord[4]; int delta_cx, delta_cy; int angle = m_Orient; int seg_width; GRSetDrawMode( aDC, aDrawInfo.m_DrawMode ); // calculate pad shape position : wxPoint shape_pos = ReturnShapePos() - aDrawInfo.m_Offset; wxSize halfsize = m_Size; halfsize.x >>= 1; halfsize.y >>= 1; switch( GetShape() ) { case PAD_CIRCLE: if( aDrawInfo.m_ShowPadFilled ) GRFilledCircle( aClipBox, aDC, shape_pos.x, shape_pos.y, halfsize.x + aDrawInfo.m_Mask_margin.x, 0, aDrawInfo.m_Color, aDrawInfo.m_Color ); else GRCircle( aClipBox, aDC, shape_pos.x, shape_pos.y, halfsize.x + aDrawInfo.m_Mask_margin.x, m_PadSketchModePenSize, aDrawInfo.m_Color ); if( aDrawInfo.m_PadClearance ) { GRCircle( aClipBox, aDC, shape_pos.x, shape_pos.y, halfsize.x + aDrawInfo.m_PadClearance, 0, aDrawInfo.m_Color ); } break; case PAD_OVAL: { wxPoint segStart, segEnd; seg_width = BuildSegmentFromOvalShape(segStart, segEnd, angle); segStart += shape_pos; segEnd += shape_pos; if( aDrawInfo.m_ShowPadFilled ) { GRFillCSegm( aClipBox, aDC, segStart.x, segStart.y, segEnd.x, segEnd.y, seg_width, aDrawInfo.m_Color ); } else { GRCSegm( aClipBox, aDC, segStart.x, segStart.y, segEnd.x, segEnd.y, seg_width, m_PadSketchModePenSize, aDrawInfo.m_Color ); } /* Draw the isolation line. */ if( aDrawInfo.m_PadClearance ) { seg_width += 2 * aDrawInfo.m_PadClearance; GRCSegm( aClipBox, aDC, segStart.x, segStart.y, segEnd.x, segEnd.y, seg_width, aDrawInfo.m_Color ); } } break; case PAD_RECT: case PAD_TRAPEZOID: BuildPadPolygon( coord, aDrawInfo.m_Mask_margin, angle ); for( int ii = 0; ii < 4; ii++ ) coord[ii] += shape_pos; GRClosedPoly( aClipBox, aDC, 4, coord, aDrawInfo.m_ShowPadFilled, aDrawInfo.m_ShowPadFilled ? 0 : m_PadSketchModePenSize, aDrawInfo.m_Color, aDrawInfo.m_Color ); if( aDrawInfo.m_PadClearance ) { BuildPadPolygon( coord, wxSize( aDrawInfo.m_PadClearance, aDrawInfo.m_PadClearance ), angle ); for( int ii = 0; ii < 4; ii++ ) coord[ii] += shape_pos; GRClosedPoly( aClipBox, aDC, 4, coord, 0, aDrawInfo.m_Color, aDrawInfo.m_Color ); } break; default: break; } /* Draw the pad hole */ wxPoint holepos = m_Pos - aDrawInfo.m_Offset; int hole = m_Drill.x >> 1; if( aDrawInfo.m_ShowPadFilled && hole ) { bool blackpenstate = false; if( aDrawInfo.m_IsPrinting ) { blackpenstate = GetGRForceBlackPenState(); GRForceBlackPen( false ); aDrawInfo.m_HoleColor = g_DrawBgColor; } if( aDrawInfo.m_DrawMode != GR_XOR ) GRSetDrawMode( aDC, GR_COPY ); else GRSetDrawMode( aDC, GR_XOR ); switch( m_DrillShape ) { case PAD_CIRCLE: #ifdef USE_WX_ZOOM if( aDC->LogicalToDeviceXRel( hole ) > 1 ) #else if( aDrawInfo.m_Scale * hole > 1 ) /* draw hole if its size is enough */ #endif GRFilledCircle( aClipBox, aDC, holepos.x, holepos.y, hole, 0, aDrawInfo.m_Color, aDrawInfo.m_HoleColor ); break; case PAD_OVAL: halfsize.x = m_Drill.x >> 1; halfsize.y = m_Drill.y >> 1; if( m_Drill.x > m_Drill.y ) /* horizontal */ { delta_cx = halfsize.x - halfsize.y; delta_cy = 0; seg_width = m_Drill.y; } else /* vertical */ { delta_cx = 0; delta_cy = halfsize.y - halfsize.x; seg_width = m_Drill.x; } RotatePoint( &delta_cx, &delta_cy, angle ); GRFillCSegm( aClipBox, aDC, holepos.x + delta_cx, holepos.y + delta_cy, holepos.x - delta_cx, holepos.y - delta_cy, seg_width, aDrawInfo.m_HoleColor ); break; default: break; } if( aDrawInfo.m_IsPrinting ) GRForceBlackPen( blackpenstate ); } GRSetDrawMode( aDC, aDrawInfo.m_DrawMode ); /* Draw "No connect" ( / or \ or cross X ) if necessary. : */ if( m_Netname.IsEmpty() && aDrawInfo.m_ShowNCMark ) { int dx0 = MIN( halfsize.x, halfsize.y ); int nc_color = BLUE; if( m_Masque_Layer & LAYER_FRONT ) /* Draw \ */ GRLine( aClipBox, aDC, holepos.x - dx0, holepos.y - dx0, holepos.x + dx0, holepos.y + dx0, 0, nc_color ); if( m_Masque_Layer & LAYER_BACK ) /* Draw / */ GRLine( aClipBox, aDC, holepos.x + dx0, holepos.y - dx0, holepos.x - dx0, holepos.y + dx0, 0, nc_color ); } /* Draw the pad number */ if( !aDrawInfo.m_Display_padnum && !aDrawInfo.m_Display_netname ) return; wxPoint tpos0 = shape_pos; // Position of the centre of text wxPoint tpos = tpos0; wxSize AreaSize; // size of text area, normalized to // AreaSize.y < AreaSize.x int shortname_len = m_ShortNetname.Len(); if( !aDrawInfo.m_Display_netname ) shortname_len = 0; if( GetShape() == PAD_CIRCLE ) angle = 0; AreaSize = m_Size; if( m_Size.y > m_Size.x ) { angle += 900; AreaSize.x = m_Size.y; AreaSize.y = m_Size.x; } if( shortname_len > 0 ) // if there is a netname, provides room // to display this netname { AreaSize.y /= 2; // Text used only the upper area of the // pad. The lower area displays the net // name tpos.y -= AreaSize.y / 2; } // Calculate the position of text, that is the middle point of the upper // area of the pad RotatePoint( &tpos, shape_pos, angle ); /* Draw text with an angle between -90 deg and + 90 deg */ int t_angle = angle; NORMALIZE_ANGLE_90( t_angle ); /* Note: in next calculations, texte size is calculated for 3 or more * chars. Of course, pads numbers and nets names can have less than 3 * chars. but after some tries, i found this is gives the best look */ #define MIN_CHAR_COUNT 3 wxString buffer; int tsize; if( aDrawInfo.m_Display_padnum ) { ReturnStringPadName( buffer ); int numpad_len = buffer.Len(); numpad_len = MAX( numpad_len, MIN_CHAR_COUNT ); tsize = min( AreaSize.y, AreaSize.x / numpad_len ); #define CHAR_SIZE_MIN 5 #ifdef USE_WX_ZOOM if( aDC->LogicalToDeviceXRel( tsize ) >= CHAR_SIZE_MIN ) // Not drawable when size too small. #else if( aDrawInfo.m_Scale * tsize >= CHAR_SIZE_MIN ) // Not drawable when size too small. #endif { // tsize reserve room for marges and segments thickness tsize = (int) ( tsize * 0.8 ); DrawGraphicText( aDrawInfo.m_DrawPanel, aDC, tpos, WHITE, buffer, t_angle, wxSize( tsize, tsize ), GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER, tsize / 7, false, false, false ); } } // display the short netname, if exists if( shortname_len == 0 ) return; shortname_len = MAX( shortname_len, MIN_CHAR_COUNT ); tsize = min( AreaSize.y, AreaSize.x / shortname_len ); #ifdef USE_WX_ZOOM if( aDC->LogicalToDeviceXRel( tsize ) >= CHAR_SIZE_MIN ) // Not drawable in size too small. #else if( aDrawInfo.m_Scale * tsize >= CHAR_SIZE_MIN ) // Not drawable in size too small. #endif { tpos = tpos0; if( aDrawInfo.m_Display_padnum ) tpos.y += AreaSize.y / 2; RotatePoint( &tpos, shape_pos, angle ); // tsize reserve room for marges and segments thickness tsize = (int) ( tsize * 0.8 ); DrawGraphicText( aDrawInfo.m_DrawPanel, aDC, tpos, WHITE, m_ShortNetname, t_angle, wxSize( tsize, tsize ), GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER, tsize / 7, false, false ); } } /** function BuildSegmentFromOvalShape * Has meaning only for OVAL (and ROUND) pads. * Build an equivalent segment having the same shape as the OVAL shape, * aSegStart and aSegEnd are the ending points of the equivalent segment of the shape * aRotation is the asked rotation of the segment (usually m_Orient) */ int D_PAD::BuildSegmentFromOvalShape(wxPoint& aSegStart, wxPoint& aSegEnd, int aRotation) const { int width; if( m_Size.y < m_Size.x ) // Build an horizontal equiv segment { int delta = ( m_Size.x - m_Size.y ) / 2; aSegStart.x = -delta; aSegStart.y = 0; aSegEnd.x = delta; aSegEnd.y = 0; width = m_Size.y; } else // Vertical oval: build a vertical equiv segment { int delta = ( m_Size.y -m_Size.x ) / 2; aSegStart.x = 0; aSegStart.y = -delta; aSegEnd.x = 0; aSegEnd.y = delta; width = m_Size.x; } if( aRotation ) { RotatePoint( &aSegStart, aRotation); RotatePoint( &aSegEnd, aRotation); } return width; } /** function BuildPadPolygon * Has meaning only for polygonal pads (trapeziod and rectangular) * Build the Corner list of the polygonal shape, * depending on shape, extra size (clearance ...) and orientation * @param aCoord[4] = a buffer to fill. * @param aInflateValue = wxSize: the clearance or margin value. value > 0: inflate, < 0 deflate * @param aRotation = full rotation of the polygon, usually m_Orient */ void D_PAD::BuildPadPolygon( wxPoint aCoord[4], wxSize aInflateValue, int aRotation ) const { if( (GetShape() != PAD_RECT) && (GetShape() != PAD_TRAPEZOID) ) return; wxSize delta; wxSize halfsize; halfsize.x = m_Size.x >> 1; halfsize.y = m_Size.y >> 1; /* For rectangular shapes, inflate is easy */ if( GetShape() == PAD_RECT ) { halfsize += aInflateValue; // Verify if do not deflate more than than size // Only possible for inflate negative values. if( halfsize.x < 0 ) halfsize.x = 0; if( halfsize.y < 0 ) halfsize.y = 0; } else { // Trapezoidal pad: verify delta values delta.x = ( m_DeltaSize.x >> 1 ); delta.y = ( m_DeltaSize.y >> 1 ); // be sure delta values are not to large if( (delta.x < 0) && (delta.x <= -halfsize.y) ) delta.x = -halfsize.y + 1; if( (delta.x > 0) && (delta.x >= halfsize.y) ) delta.x = halfsize.y - 1; if( (delta.y < 0) && (delta.y <= -halfsize.x) ) delta.y = -halfsize.x + 1; if( (delta.y > 0) && (delta.y >= halfsize.x) ) delta.y = halfsize.x - 1; } // Build the basic rectangular or trapezoid shape // delta is null for rectangular shapes aCoord[0].x = -halfsize.x - delta.y; // lower left aCoord[0].y = +halfsize.y + delta.x; aCoord[1].x = -halfsize.x + delta.y; // upper left aCoord[1].y = -halfsize.y - delta.x; aCoord[2].x = +halfsize.x - delta.y; // upper right aCoord[2].y = -halfsize.y + delta.x; aCoord[3].x = +halfsize.x + delta.y; // lower right aCoord[3].y = +halfsize.y - delta.x; // Offsetting the trapezoid shape id needed // It is assumed delta.x or/and delta.y == 0 if( GetShape() == PAD_TRAPEZOID && (aInflateValue.x != 0 || aInflateValue.y != 0) ) { double angle; wxSize corr; if( delta.y ) // lower and upper segment is horizontal { // Calculate angle of left (or right) segment with vertical axis angle = atan2( double( m_DeltaSize.y ), double( m_Size.y ) ); // left and right sides are moved by aInflateValue.x in their perpendicular direction // We must calculate the corresponding displacement on the horizontal axis // that is delta.x +- corr.x depending on the corner corr.x = wxRound( tan( angle ) * aInflateValue.x ); delta.x = wxRound( aInflateValue.x / cos( angle ) ); // Horizontal sides are moved up and down by aInflateValue.y delta.y = aInflateValue.y; // corr.y = 0 by the constructor } else if( delta.x ) // left and right segment is vertical { // Calculate angle of lower (or upper) segment with horizontal axis angle = atan2( double( m_DeltaSize.x ), double( m_Size.x ) ); // lower and upper sides are moved by aInflateValue.x in their perpendicular direction // We must calculate the corresponding displacement on the vertical axis // that is delta.y +- corr.y depending on the corner corr.y = wxRound( tan( angle ) * aInflateValue.y ); delta.y = wxRound( aInflateValue.y / cos( angle ) ); // Vertical sides are moved left and right by aInflateValue.x delta.x = aInflateValue.x; // corr.x = 0 by the constructor } else // the trapezoid is a rectangle { delta = aInflateValue; // this pad is rectangular (delta null). } aCoord[0].x += -delta.x - corr.x; // lower left aCoord[0].y += delta.y + corr.y; aCoord[1].x += -delta.x + corr.x; // upper left aCoord[1].y += -delta.y - corr.y; aCoord[2].x += delta.x - corr.x; // upper right aCoord[2].y += -delta.y + corr.y; aCoord[3].x += delta.x + corr.x; // lower right aCoord[3].y += delta.y - corr.y; /* test coordinates and clamp them if the offset correction is too large: * Note: if a coordinate is bad, the other "symmetric" coordinate is bad * So when a bad coordinate is found, the 2 symmetric coordinates * are set to the minimun value (0) */ if( aCoord[0].x > 0 ) // lower left x coordinate must be <= 0 aCoord[0].x = aCoord[3].x = 0; if( aCoord[1].x > 0 ) // upper left x coordinate must be <= 0 aCoord[1].x = aCoord[2].x = 0; if( aCoord[0].y < 0 ) // lower left y coordinate must be >= 0 aCoord[0].y = aCoord[1].y = 0; if( aCoord[3].y < 0 ) // lower right y coordinate must be >= 0 aCoord[3].y = aCoord[2].y = 0; } if( aRotation ) { for( int ii = 0; ii < 4; ii++ ) RotatePoint( &aCoord[ii], aRotation ); } }