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raygui/examples/animation_curve/gui_curve_editor.h

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/*******************************************************************************************
*
* CurveEdit v1.0 - A cubic Hermite editor for making animation curves
*
* MODULE USAGE:
* #define GUI_CURVE_EDITOR_IMPLEMENTATION
* #include "gui_curve_edit.h"
*
* INIT: GuiCurveEditState state = InitCurveEdit();
* EVALUATE: float y = EvalGuiCurve(&state, t); // 0 <= t <= 1
* DRAW: BeginScissorMode(bounds.x,bounds.y,bounds.width,bounds.height);
* GuiCurveEdit(&state, bounds, pointSize);
* EndScissorMode();
*
* NOTE: See 'Module Structures Declaration' section for more informations.
*
* NOTE: This module uses functions of the stdlib:
* - qsort
*
* NOTE: Built-in interactions:
* - Left click to move/add point or move tangents
* - While moving a tangent, hold (left/right) SHIFT to disable tangent symetry
* - Right click to remove a point
*
*
* LICENSE: zlib/libpng
*
* Copyright (c) 2023 Pierre Jaffuer (@smallcluster)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose, including commercial
* applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim that you
* wrote the original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
* as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/
#include "raylib.h"
#ifndef GUI_CURVE_EDITOR_H
#define GUI_CURVE_EDITOR_H
#ifndef GUI_CURVE_EDITOR_MAX_POINTS
#define GUI_CURVE_EDITOR_MAX_POINTS 30
#endif
//----------------------------------------------------------------------------------
// Module Structures Declaration
//----------------------------------------------------------------------------------
typedef struct {
Vector2 position; // In normalized space [0.0f, 1.0f]
Vector2 tangents; // The derivatives (left/right) of the 1D curve
// Let the curve editor calculate tangents to linearize part of the curve
bool leftLinear;
bool rightLinear;
} GuiCurveEditorPoint;
typedef struct {
float start; // Value at y = 0
float end; // Value at y = 1
// Always valid (unless you manualy change state's point array). Make sure to set it to -1 before init
int selectedIndex;
// Unsorted array with at least one point (constant curve)
GuiCurveEditorPoint points[GUI_CURVE_EDITOR_MAX_POINTS];
int numPoints;
// Private variables
bool editLeftTangent;
bool editRightTangent;
Vector2 mouseOffset;
} GuiCurveEditorState;
#ifdef __cplusplus
extern "C" { // Prevents name mangling of functions
#endif
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
GuiCurveEditorState InitGuiCurveEditor(); // Initialize curve editor state
void GuiCurveEditor(GuiCurveEditorState *state, Rectangle bounds); // Draw and update curve control
// 1D Interpolation
// Returns the y value (in [start, end]) of the curve at x = t
// t must be normalized [0.f, 1.f]
float GuiCurveEval(GuiCurveEditorState *state, float t);
#ifdef __cplusplus
}
#endif
#endif // GUI_CURVE_EDITOR_H
/***********************************************************************************
*
* GUI_CURVE_EDITOR IMPLEMENTATION
*
************************************************************************************/
#if defined(GUI_CURVE_EDITOR_IMPLEMENTATION)
#include "../../src/raygui.h" // Change this to fit your project
#include "stdlib.h" // Required for qsort
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
GuiCurveEditorState InitGuiCurveEditor()
{
GuiCurveEditorState state = { 0 };
state.start = 0;
state.end = 1;
state.selectedIndex = 0;
state.editLeftTangent = false;
state.editRightTangent = false;
state.mouseOffset = (Vector2){ 0.0f, 0.0f };
// At least one point (AVG by default)
state.numPoints = 1;
state.points[0].position = (Vector2){ 0.5f, 0.5f };
state.points[0].tangents = (Vector2){ 0.0f, 0.0f };
state.points[0].leftLinear = false;
state.points[0].rightLinear = false;
return state;
}
static int CompareGuiCurveEditPointPtr(const void *a, const void *b)
{
float fa = (*(GuiCurveEditorPoint**)a)->position.x;
float fb = (*(GuiCurveEditorPoint**)b)->position.x;
return ((fa > fb) - (fa < fb));
}
float GuiCurveEval(GuiCurveEditorState *state, float t)
{
// Sort points
GuiCurveEditorPoint* sortedPoints[GUI_CURVE_EDITOR_MAX_POINTS];
for (int i=0; i < state->numPoints; i++) sortedPoints[i] = &state->points[i];
qsort(sortedPoints, state->numPoints, sizeof(GuiCurveEditorPoint*), CompareGuiCurveEditPointPtr);
if (state->numPoints == 0) return state->start;
// Constants part on edges
if (t <= sortedPoints[0]->position.x) return state->start + (state->end-state->start)*sortedPoints[0]->position.y;
if (t >= sortedPoints[state->numPoints-1]->position.x) return state->start + (state->end-state->start)*sortedPoints[state->numPoints-1]->position.y;
// Find curve portion
for (int i=0; i < state->numPoints-1; i++)
{
const GuiCurveEditorPoint *p1 = sortedPoints[i];
const GuiCurveEditorPoint *p2 = sortedPoints[i+1];
// Skip this range
if (!((t >= p1->position.x) && (t < p2->position.x)) || (p1->position.x == p2->position.x)) continue;
float scale = (p2->position.x-p1->position.x);
float T = (t-p1->position.x)/scale;
float startTangent = scale*p1->tangents.y;
float endTangent = scale*p2->tangents.x;
float T2 = T*T;
float T3 = T*T*T;
return (state->start + (state->end-state->start)*((2*T3 - 3*T2 + 1)*p1->position.y + (T3 - 2*T2 + T)*startTangent + (3*T2 - 2*T3)*p2->position.y + (T3 - T2)*endTangent));
}
return state->start;
}
void GuiCurveEditor(GuiCurveEditorState *state, Rectangle bounds)
{
// CONST
//----------------------------------------------------------------------------------
const float pointSize = 10.0f;
const float fontSize = GuiGetStyle(DEFAULT, TEXT_SIZE);
const float handleLength = pointSize*2.5f;
const float handleSize = pointSize/1.5f;
const Rectangle innerBounds = (Rectangle){ bounds.x + fontSize, bounds.y + fontSize, bounds.width - 2*fontSize, bounds.height - 2*fontSize };
const Vector2 mouse = GetMousePosition();
const Vector2 mouseLocal = (Vector2){ (mouse.x - innerBounds.x)/innerBounds.width, (innerBounds.y + innerBounds.height-mouse.y)/innerBounds.height};
//----------------------------------------------------------------------------------
// UPDATE STATE
//----------------------------------------------------------------------------------
// Find first point under mouse (-1 if not found)
int hoveredPointIndex = -1;
for (int i = 0; i < state->numPoints; i++)
{
const GuiCurveEditorPoint *p = &state->points[i];
const Vector2 screenPos = (Vector2){ p->position.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height-p->position.y*innerBounds.height };
const Rectangle pointRect = (Rectangle){ screenPos.x - pointSize/2.0f, screenPos.y - pointSize/2.0f, pointSize, pointSize };
if (CheckCollisionPointRec(mouse, pointRect))
{
hoveredPointIndex = i;
break;
}
}
// Unselect tangents
if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT))
{
state->editLeftTangent = false;
state->editRightTangent = false;
}
// Select a tangent if possible
if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) && (state->selectedIndex != -1) && CheckCollisionPointRec(mouse, bounds))
{
const GuiCurveEditorPoint* p = &state->points[state->selectedIndex];
const Vector2 screenPos = (Vector2){ p->position.x*innerBounds.width+innerBounds.x, innerBounds.y+innerBounds.height-p->position.y*innerBounds.height };
// Left control
Vector2 target = (Vector2){ (p->position.x-1)*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - (p->position.y-p->tangents.x)*innerBounds.height };
Vector2 dir = (Vector2){ target.x-screenPos.x, target.y-screenPos.y };
float d = sqrt(dir.x*dir.x + dir.y*dir.y);
Vector2 control = (Vector2){ screenPos.x + dir.x/d*handleLength, screenPos.y + dir.y/d*handleLength };
Rectangle controlRect = (Rectangle){ control.x - handleSize/2.0f, control.y - handleSize/2.0f, handleSize, handleSize };
// Edit left tangent
if (CheckCollisionPointRec(mouse, controlRect)) state->editLeftTangent = true;
// Right control
target = (Vector2){ (p->position.x + 1)*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - (p->position.y + p->tangents.y)*innerBounds.height };
dir = (Vector2){ target.x-screenPos.x, target.y-screenPos.y };
d = sqrt(dir.x*dir.x + dir.y*dir.y);
control = (Vector2){ screenPos.x + dir.x/d*handleLength, screenPos.y + dir.y/d*handleLength };
controlRect = (Rectangle){ control.x - handleSize/2.0f, control.y - handleSize/2.0f, handleSize, handleSize };
// Edit right tangent
if (CheckCollisionPointRec(mouse, controlRect)) state->editRightTangent = true;
}
// Move tangents
if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) && state->editRightTangent)
{
// editRightTangent == true implies selectedIndex != -1
GuiCurveEditorPoint *p = &state->points[state->selectedIndex];
const Vector2 dir = (Vector2){ mouseLocal.x - p->position.x, mouseLocal.y - p->position.y};
// Calculate right tangent slope
p->tangents.y = (dir.x < 0.001f)? dir.y/0.001f : dir.y/dir.x;
p->rightLinear = false; // Stop right linearization update
// Tangents are symetric by default unless SHIFT is pressed
if (!(IsKeyDown(KEY_LEFT_SHIFT) || IsKeyDown(KEY_RIGHT_SHIFT)))
{
p->tangents.x = p->tangents.y;
p->leftLinear = false; // Stop left linearization update
}
}
else if (IsMouseButtonDown(MOUSE_BUTTON_LEFT) && state->editLeftTangent)
{
// editLeftTangent == true implies selectedIndex != -1
GuiCurveEditorPoint *p = &state->points[state->selectedIndex];
const Vector2 dir = (Vector2){ mouseLocal.x - p->position.x, mouseLocal.y - p->position.y };
// Calculate left tangent slope
p->tangents.x = (dir.x > -0.001f)? dir.y/(-0.001f) : dir.y/dir.x;
p->leftLinear = false; // Stop left linearization update
// Tangents are symetric by default unless SHIFT is pressed
if (!(IsKeyDown(KEY_LEFT_SHIFT) || IsKeyDown(KEY_RIGHT_SHIFT)))
{
p->tangents.y = p->tangents.x;
p->rightLinear = false; // Stop right linearization update
}
}
// Select a point
else if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) && (hoveredPointIndex != -1) && CheckCollisionPointRec(mouse, bounds))
{
state->selectedIndex = hoveredPointIndex;
const GuiCurveEditorPoint *p = &state->points[state->selectedIndex];
state->mouseOffset = (Vector2){ p->position.x - mouseLocal.x, p->position.y - mouseLocal.y };
}
// Remove a point (check against bounds)
else if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT) && (hoveredPointIndex != -1) && CheckCollisionPointRec(mouse, bounds) && (state->numPoints > 1))
{
// Deselect everything
state->selectedIndex = 0; // select first point by default
state->editLeftTangent = false;
state->editRightTangent = false;
// Remove point
state->numPoints -= 1;
for (int i = hoveredPointIndex; i < state->numPoints; i++) state->points[i] = state->points[i+1];
}
// Add a point (check against innerBounds)
else if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) && CheckCollisionPointRec(mouse, innerBounds) && (state->numPoints < GUI_CURVE_EDITOR_MAX_POINTS))
{
state->editLeftTangent = false;
state->editRightTangent = false;
// Create new point
GuiCurveEditorPoint p;
p.tangents = (Vector2){ 0.0f, 0.0f };
p.position = mouseLocal;
p.leftLinear = false;
p.rightLinear = false;
// Append point
state->points[state->numPoints] = p;
state->selectedIndex = state->numPoints; // select new point
state->numPoints += 1;
// Point is add on mouse pos
state->mouseOffset = (Vector2){ 0, 0 };
}
// Move selected point
else if ((state->selectedIndex != -1) && IsMouseButtonDown(MOUSE_BUTTON_LEFT) && CheckCollisionPointRec(mouse, bounds))
{
GuiCurveEditorPoint *p = &state->points[state->selectedIndex];
// use mouse offset on click to prevent point teleporting to mouse
const Vector2 newLocalPos = (Vector2){ mouseLocal.x + state->mouseOffset.x, mouseLocal.y + state->mouseOffset.y };
// Clamp to innerbounds
p->position.x = (newLocalPos.x < 0)? 0 : ((newLocalPos.x > 1)? 1 : newLocalPos.x);
p->position.y = (newLocalPos.y < 0)? 0 : ((newLocalPos.y > 1)? 1 : newLocalPos.y);
}
// Sort points
GuiCurveEditorPoint *sortedPoints[GUI_CURVE_EDITOR_MAX_POINTS] = { 0 };
for (int i = 0; i < state->numPoints; i++) sortedPoints[i] = &state->points[i];
qsort(sortedPoints, state->numPoints, sizeof(GuiCurveEditorPoint*), CompareGuiCurveEditPointPtr);
// Update linear tangents
for (int i = 0; i < state->numPoints; i++)
{
GuiCurveEditorPoint *p = sortedPoints[i];
// Left tangent
if ((i > 0) && p->leftLinear)
{
const GuiCurveEditorPoint *p2 = sortedPoints[i - 1];
Vector2 dir = (Vector2){ p2->position.x - p->position.x, p2->position.y - p->position.y };
p->tangents.x = (dir.x == 0)? 0 : dir.y/dir.x;
}
// Right tangent
if ((i < state->numPoints - 1) && p->rightLinear)
{
const GuiCurveEditorPoint *p2 = sortedPoints[i + 1];
Vector2 dir = (Vector2){ p2->position.x - p->position.x, p2->position.y - p->position.y };
p->tangents.y = (dir.x == 0)? 0 : dir.y/dir.x;
}
}
//----------------------------------------------------------------------------------
// DRAWING
//----------------------------------------------------------------------------------
DrawRectangle(bounds.x, bounds.y, bounds.width, bounds.height, GetColor(GuiGetStyle(DEFAULT, BACKGROUND_COLOR)));
// Draw grid
// H lines
const Color lineColor = GetColor(GuiGetStyle(DEFAULT, BORDER_COLOR_NORMAL));
DrawLine(bounds.x, innerBounds.y, bounds.x+bounds.width, innerBounds.y, lineColor); // end
DrawLine(bounds.x, innerBounds.y+innerBounds.height/2, bounds.x+bounds.width, innerBounds.y+innerBounds.height/2, lineColor); // avg
DrawLine(bounds.x, innerBounds.y+innerBounds.height, bounds.x+bounds.width, innerBounds.y+innerBounds.height, lineColor); // start
// V lines
DrawLine(innerBounds.x, bounds.y, innerBounds.x, bounds.y+bounds.height, lineColor); // 0
DrawLine(innerBounds.x + innerBounds.width/4, bounds.y, innerBounds.x + innerBounds.width/4, bounds.y + bounds.height, lineColor); // 0.25
DrawLine(innerBounds.x + innerBounds.width/2, bounds.y, innerBounds.x + innerBounds.width/2, bounds.y + bounds.height, lineColor); // 0.5
DrawLine(innerBounds.x + 3*innerBounds.width/4, bounds.y, innerBounds.x + 3*innerBounds.width/4, bounds.y + bounds.height, lineColor); // 0.75
DrawLine(innerBounds.x + innerBounds.width, bounds.y, innerBounds.x + innerBounds.width, bounds.y + bounds.height, lineColor); // 1
Font font = GuiGetFont();
// V labels
DrawTextEx(font, "0", (Vector2){ innerBounds.x, bounds.y + bounds.height-fontSize}, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, "0.25", (Vector2){ innerBounds.x + innerBounds.width/4.0f, bounds.y + bounds.height - fontSize}, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, "0.5", (Vector2){ innerBounds.x + innerBounds.width/2.0f, bounds.y + bounds.height - fontSize}, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, "0.75", (Vector2){ innerBounds.x + 3.0f*innerBounds.width/4.0f, bounds.y + bounds.height-fontSize}, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, "1", (Vector2){ innerBounds.x + innerBounds.width, bounds.y+bounds.height - fontSize}, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
// H labels
DrawTextEx(font, TextFormat("%.2f", state->start), (Vector2){ innerBounds.x, innerBounds.y - fontSize+innerBounds.height }, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, TextFormat("%.2f", state->start + (state->end-state->start)/2.f), (Vector2){ innerBounds.x, innerBounds.y - fontSize + innerBounds.height/2.0f }, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
DrawTextEx(font, TextFormat("%.2f", state->end), (Vector2){ innerBounds.x, innerBounds.y }, fontSize, GuiGetStyle(DEFAULT, TEXT_SPACING), lineColor);
// Draw contours
if (CheckCollisionPointRec(mouse, bounds)) DrawRectangleLines(bounds.x, bounds.y, bounds.width, bounds.height, GetColor(GuiGetStyle(DEFAULT, BORDER_COLOR_FOCUSED)));
else DrawRectangleLines(bounds.x, bounds.y, bounds.width, bounds.height, GetColor(GuiGetStyle(DEFAULT, BORDER_COLOR_NORMAL)));
// Draw points
for (int i = 0; i < state->numPoints; i++)
{
const GuiCurveEditorPoint *p = sortedPoints[i];
const Vector2 screenPos = (Vector2){ p->position.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - p->position.y*innerBounds.height };
const Rectangle pointRect = (Rectangle){ screenPos.x - pointSize/2.0f, screenPos.y - pointSize/2.0f, pointSize, pointSize };
Color pointColor = { 0 };
Color pointBorderColor = { 0 };
// Draw point
if (&state->points[state->selectedIndex] == p)
{
// Draw left handle
if (i > 0)
{
const Vector2 target = (Vector2){ (p->position.x - 1)*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - (p->position.y - p->tangents.x)*innerBounds.height };
const Vector2 dir = (Vector2){ target.x - screenPos.x, target.y - screenPos.y };
const float d = sqrt(dir.x*dir.x + dir.y*dir.y);
const Vector2 control = (Vector2){ screenPos.x + dir.x/d*handleLength, screenPos.y + dir.y/d*handleLength };
const Rectangle controlRect = (Rectangle){ control.x - handleSize/2.0f, control.y - handleSize/2.0f, handleSize, handleSize };
Color controlColor = { 0 };
if (state->editLeftTangent)
{
controlColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_PRESSED));
}
else if (CheckCollisionPointRec(mouse, controlRect))
{
controlColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_FOCUSED));
}
else
{
controlColor = GetColor(GuiGetStyle(BUTTON, BASE_COLOR_NORMAL));
}
DrawLine(screenPos.x,screenPos.y, control.x, control.y, controlColor);
DrawRectangle(controlRect.x, controlRect.y, controlRect.width, controlRect.height, controlColor);
DrawRectangleLines(controlRect.x, controlRect.y, controlRect.width, controlRect.height, controlColor);
}
// Draw right handle
if (i < state->numPoints - 1)
{
const Vector2 target = (Vector2){ (p->position.x + 1)*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - (p->position.y + p->tangents.y)*innerBounds.height };
const Vector2 dir = (Vector2){ target.x - screenPos.x, target.y - screenPos.y };
const float d = sqrt(dir.x*dir.x + dir.y*dir.y);
const Vector2 control = (Vector2){ screenPos.x + dir.x/d*handleLength, screenPos.y + dir.y/d*handleLength };
const Rectangle controlRect = (Rectangle){ control.x - handleSize/2.0f, control.y - handleSize/2.0f, handleSize, handleSize };
Color controlColor = { 0 };
if (state->editRightTangent)
{
controlColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_PRESSED));
}
else if (CheckCollisionPointRec(mouse, controlRect))
{
controlColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_FOCUSED));
}
else
{
controlColor = GetColor(GuiGetStyle(BUTTON, BASE_COLOR_NORMAL));
}
DrawLine(screenPos.x,screenPos.y, control.x, control.y, controlColor);
DrawRectangle(controlRect.x, controlRect.y, controlRect.width, controlRect.height, controlColor);
DrawRectangleLines(controlRect.x, controlRect.y, controlRect.width, controlRect.height, controlColor);
}
pointColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_PRESSED));
pointBorderColor = GetColor(GuiGetStyle(DEFAULT, BORDER_COLOR_NORMAL));
}
else if (&state->points[hoveredPointIndex] == p)
{
pointColor = GetColor(GuiGetStyle(DEFAULT, BASE_COLOR_FOCUSED));
pointBorderColor = GetColor(GuiGetStyle(DEFAULT, BORDER_COLOR_NORMAL));
}
else
{
pointColor = GetColor(GuiGetStyle(BUTTON, BASE_COLOR_NORMAL));
pointBorderColor = GetColor(GuiGetStyle(BUTTON, BORDER_COLOR_NORMAL));
}
DrawRectangle(pointRect.x, pointRect.y, pointRect.width, pointRect.height, pointColor);
DrawRectangleLines(pointRect.x, pointRect.y, pointRect.width, pointRect.height, pointBorderColor);
}
// Draw curve
Color curveColor = GetColor(GuiGetStyle(LABEL, TEXT_COLOR_FOCUSED));
if (state->numPoints == 1)
{
const GuiCurveEditorPoint *p = sortedPoints[0];
const Vector2 screenPos = (Vector2){ p->position.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - p->position.y*innerBounds.height };
DrawLine(innerBounds.x, screenPos.y, innerBounds.x+innerBounds.width, screenPos.y, curveColor);
}
else
{
for (int i = 0; i < state->numPoints - 1; i++)
{
const GuiCurveEditorPoint *p1 = sortedPoints[i];
const GuiCurveEditorPoint *p2 = sortedPoints[i + 1];
const Vector2 screenPos1 = (Vector2){ p1->position.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - p1->position.y*innerBounds.height };
const Vector2 screenPos2 = (Vector2){ p2->position.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - p2->position.y*innerBounds.height };
// Constant on edge
if ((screenPos1.x > innerBounds.x) && (i == 0))
{
DrawLine(innerBounds.x, screenPos1.y, screenPos1.x, screenPos1.y, curveColor);
}
if ((screenPos2.x < innerBounds.x + innerBounds.width) && (i == (state->numPoints - 2)))
{
DrawLine(screenPos2.x, screenPos2.y, innerBounds.x+innerBounds.width, screenPos2.y, curveColor);
}
// Draw cubic Hermite curve
const float scale = (p2->position.x - p1->position.x)/3.0f;
const Vector2 offset1 = (Vector2){ scale, scale*p1->tangents.y };
// negative endTangent => top part => need to invert value to calculate offset
const Vector2 offset2 = (Vector2){ -scale, -scale*p2->tangents.x };
const Vector2 c1 = (Vector2){ p1->position.x + offset1.x, p1->position.y + offset1.y };
const Vector2 c2 = (Vector2){ p2->position.x + offset2.x, p2->position.y + offset2.y };
const Vector2 screenC1 = (Vector2){ c1.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - c1.y*innerBounds.height };
const Vector2 screenC2 = (Vector2){ c2.x*innerBounds.width + innerBounds.x, innerBounds.y + innerBounds.height - c2.y*innerBounds.height };
DrawSplineSegmentBezierCubic(screenPos1, screenC1, screenC2, screenPos2, 1, curveColor);
}
}
}
#endif // GUI_CURVE_EDITOR_IMPLEMENTATION
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