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Try to support grid lines sub-pixel positioning

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No simple solution to this issue...
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Ray
2019-01-15 16:28:54 +01:00
parent 947c1abb48
commit adf03f9877
1 changed files with 11 additions and 5 deletions
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16
src/raygui.h
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@ -354,6 +354,7 @@ RAYGUIDEF bool GuiListView(Rectangle bounds, const char **text, int count, int *
RAYGUIDEF bool GuiListViewEx(Rectangle bounds, const char **text, int *enabledElements, int count, int *scrollIndex, int *active, int *focus, bool editMode); // with List View extended parameters
RAYGUIDEF Color GuiColorPicker(Rectangle bounds, Color color); // Color Picker control
RAYGUIDEF bool GuiMessageBox(Rectangle bounds, const char *windowTitle, const char *message); // Message Box control, displays a message
RAYGUIDEF Vector2 GuiGrid(Rectangle bounds, float spacing, int subdivs); // Grid
// Styles loading functions
RAYGUIDEF void GuiLoadStyle(const char *fileName); // Load style file (.rgs)
@ -2836,13 +2837,18 @@ RAYGUIDEF bool GuiMessageBox(Rectangle bounds, const char *windowTitle, const ch
// Grid control
// NOTE: Returns grid mouse-hover selected cell
RAYGUIDEF Vector2 GuiGrid(Rectangle bounds, int spacing, int subdivs)
// About drawing lines at subpixel spacing, simple put, not easy solution:
// https://stackoverflow.com/questions/4435450/2d-opengl-drawing-lines-that-dont-exactly-fit-pixel-raster
RAYGUIDEF Vector2 GuiGrid(Rectangle bounds, float spacing, int subdivs)
{
#define GRID_COLOR_ALPHA 0.15f // Grid lines alpha amount
GuiControlState state = guiState;
Vector2 mousePoint = GetMousePosition();
Vector2 currentCell = { -1, -1 };
int linesV = ((int)(bounds.width/spacing) + 1)*subdivs;
int linesH = ((int)(bounds.height/spacing) + 1)*subdivs;
// Update control
//--------------------------------------------------------------------
@ -2863,15 +2869,15 @@ RAYGUIDEF Vector2 GuiGrid(Rectangle bounds, int spacing, int subdivs)
case GUI_STATE_NORMAL:
{
// Draw vertical grid lines
for (int i = 0; i < (bounds.width/spacing + 1)*subdivs; i++)
for (int i = 0; i < linesV; i++)
{
DrawRectangle(bounds.x + spacing*i, bounds.y, 1, bounds.height, ((i%subdivs) == 0) ? Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA*4) : Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA));
DrawRectangleRec((Rectangle){ bounds.x + spacing*i, bounds.y, 1, bounds.height }, ((i%subdivs) == 0) ? Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA*4) : Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA));
}
// Draw horizontal grid lines
for (int i = 0; i < (bounds.height/spacing + 1)*subdivs; i++)
for (int i = 0; i < linesH; i++)
{
DrawRectangle(bounds.x, bounds.y + spacing*i, bounds.width, 1, ((i%subdivs) == 0) ? Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA*4) : Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA));
DrawRectangleRec((Rectangle){ bounds.x, bounds.y + spacing*i, bounds.width, 1 }, ((i%subdivs) == 0) ? Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA*4) : Fade(GetColor(GuiGetStyle(DEFAULT, LINES_COLOR)), GRID_COLOR_ALPHA));
}
} break;