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-rw-r--r--raylib/examples/textures/textures_textured_curve.c154
1 files changed, 64 insertions, 90 deletions
diff --git a/raylib/examples/textures/textures_textured_curve.c b/raylib/examples/textures/textures_textured_curve.c
index 3c2f060..cf426be 100644
--- a/raylib/examples/textures/textures_textured_curve.c
+++ b/raylib/examples/textures/textures_textured_curve.c
@@ -13,7 +13,6 @@
*
********************************************************************************************/
-
#include "raylib.h"
#include "raymath.h"
@@ -43,12 +42,8 @@ static Vector2 *curveSelectedPoint = NULL;
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
-static void UpdateOptions(void);
-static void UpdateCurve(void);
-static void DrawCurve(void);
static void DrawTexturedCurve(void);
-
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
@@ -81,9 +76,31 @@ int main()
{
// Update
//----------------------------------------------------------------------------------
- UpdateCurve();
- UpdateOptions();
-
+ // Curve config options
+ if (IsKeyPressed(KEY_SPACE)) showCurve = !showCurve;
+ if (IsKeyPressed(KEY_EQUAL)) curveWidth += 2;
+ if (IsKeyPressed(KEY_MINUS)) curveWidth -= 2;
+ if (curveWidth < 2) curveWidth = 2;
+
+ // Update segments
+ if (IsKeyPressed(KEY_LEFT)) curveSegments -= 2;
+ if (IsKeyPressed(KEY_RIGHT)) curveSegments += 2;
+
+ if (curveSegments < 2) curveSegments = 2;
+
+ // Update curve logic
+ // If the mouse is not down, we are not editing the curve so clear the selection
+ if (!IsMouseButtonDown(MOUSE_LEFT_BUTTON)) curveSelectedPoint = NULL;
+
+ // If a point was selected, move it
+ if (curveSelectedPoint) *curveSelectedPoint = Vector2Add(*curveSelectedPoint, GetMouseDelta());
+
+ // The mouse is down, and nothing was selected, so see if anything was picked
+ Vector2 mouse = GetMousePosition();
+ if (CheckCollisionPointCircle(mouse, curveStartPosition, 6)) curveSelectedPoint = &curveStartPosition;
+ else if (CheckCollisionPointCircle(mouse, curveStartPositionTangent, 6)) curveSelectedPoint = &curveStartPositionTangent;
+ else if (CheckCollisionPointCircle(mouse, curveEndPosition, 6)) curveSelectedPoint = &curveEndPosition;
+ else if (CheckCollisionPointCircle(mouse, curveEndPositionTangent, 6)) curveSelectedPoint = &curveEndPositionTangent;
//----------------------------------------------------------------------------------
// Draw
@@ -92,9 +109,29 @@ int main()
ClearBackground(RAYWHITE);
- DrawTexturedCurve();
- DrawCurve();
-
+ DrawTexturedCurve(); // Draw a textured Spline Cubic Bezier
+
+ // Draw spline for reference
+ if (showCurve) DrawSplineSegmentBezierCubic(curveStartPosition, curveEndPosition, curveStartPositionTangent, curveEndPositionTangent, 2, BLUE);
+
+ // Draw the various control points and highlight where the mouse is
+ DrawLineV(curveStartPosition, curveStartPositionTangent, SKYBLUE);
+ DrawLineV(curveStartPositionTangent, curveEndPositionTangent, Fade(LIGHTGRAY, 0.4f));
+ DrawLineV(curveEndPosition, curveEndPositionTangent, PURPLE);
+
+ if (CheckCollisionPointCircle(mouse, curveStartPosition, 6)) DrawCircleV(curveStartPosition, 7, YELLOW);
+ DrawCircleV(curveStartPosition, 5, RED);
+
+ if (CheckCollisionPointCircle(mouse, curveStartPositionTangent, 6)) DrawCircleV(curveStartPositionTangent, 7, YELLOW);
+ DrawCircleV(curveStartPositionTangent, 5, MAROON);
+
+ if (CheckCollisionPointCircle(mouse, curveEndPosition, 6)) DrawCircleV(curveEndPosition, 7, YELLOW);
+ DrawCircleV(curveEndPosition, 5, GREEN);
+
+ if (CheckCollisionPointCircle(mouse, curveEndPositionTangent, 6)) DrawCircleV(curveEndPositionTangent, 7, YELLOW);
+ DrawCircleV(curveEndPositionTangent, 5, DARKGREEN);
+
+ // Draw usage info
DrawText("Drag points to move curve, press SPACE to show/hide base curve", 10, 10, 10, DARKGRAY);
DrawText(TextFormat("Curve width: %2.0f (Use + and - to adjust)", curveWidth), 10, 30, 10, DARKGRAY);
DrawText(TextFormat("Curve segments: %d (Use LEFT and RIGHT to adjust)", curveSegments), 10, 50, 10, DARKGRAY);
@@ -116,53 +153,8 @@ int main()
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
-static void DrawCurve(void)
-{
- if (showCurve) DrawLineBezierCubic(curveStartPosition, curveEndPosition, curveStartPositionTangent, curveEndPositionTangent, 2, BLUE);
-
- // Draw the various control points and highlight where the mouse is
- DrawLineV(curveStartPosition, curveStartPositionTangent, SKYBLUE);
- DrawLineV(curveEndPosition, curveEndPositionTangent, PURPLE);
- Vector2 mouse = GetMousePosition();
-
- if (CheckCollisionPointCircle(mouse, curveStartPosition, 6)) DrawCircleV(curveStartPosition, 7, YELLOW);
- DrawCircleV(curveStartPosition, 5, RED);
-
- if (CheckCollisionPointCircle(mouse, curveStartPositionTangent, 6)) DrawCircleV(curveStartPositionTangent, 7, YELLOW);
- DrawCircleV(curveStartPositionTangent, 5, MAROON);
-
- if (CheckCollisionPointCircle(mouse, curveEndPosition, 6)) DrawCircleV(curveEndPosition, 7, YELLOW);
- DrawCircleV(curveEndPosition, 5, GREEN);
-
- if (CheckCollisionPointCircle(mouse, curveEndPositionTangent, 6)) DrawCircleV(curveEndPositionTangent, 7, YELLOW);
- DrawCircleV(curveEndPositionTangent, 5, DARKGREEN);
-}
-
-static void UpdateCurve(void)
-{
- // If the mouse is not down, we are not editing the curve so clear the selection
- if (!IsMouseButtonDown(MOUSE_LEFT_BUTTON))
- {
- curveSelectedPoint = NULL;
- return;
- }
-
- // If a point was selected, move it
- if (curveSelectedPoint)
- {
- *curveSelectedPoint = Vector2Add(*curveSelectedPoint, GetMouseDelta());
- return;
- }
-
- // The mouse is down, and nothing was selected, so see if anything was picked
- Vector2 mouse = GetMousePosition();
-
- if (CheckCollisionPointCircle(mouse, curveStartPosition, 6)) curveSelectedPoint = &curveStartPosition;
- else if (CheckCollisionPointCircle(mouse, curveStartPositionTangent, 6)) curveSelectedPoint = &curveStartPositionTangent;
- else if (CheckCollisionPointCircle(mouse, curveEndPosition, 6)) curveSelectedPoint = &curveEndPosition;
- else if (CheckCollisionPointCircle(mouse, curveEndPositionTangent, 6)) curveSelectedPoint = &curveEndPositionTangent;
-}
+// Draw textured curve using Spline Cubic Bezier
static void DrawTexturedCurve(void)
{
const float step = 1.0f/curveSegments;
@@ -179,11 +171,11 @@ static void DrawTexturedCurve(void)
for (int i = 1; i <= curveSegments; i++)
{
- // Segment the curve
- t = step*i;
- float a = powf(1 - t, 3);
- float b = 3*powf(1 - t, 2)*t;
- float c = 3*(1 - t)*powf(t, 2);
+ t = step*(float)i;
+
+ float a = powf(1.0f - t, 3);
+ float b = 3.0f*powf(1.0f - t, 2)*t;
+ float c = 3.0f*(1.0f - t)*powf(t, 2);
float d = powf(t, 3);
// Compute the endpoint for this segment
@@ -216,22 +208,20 @@ static void DrawTexturedCurve(void)
// Draw the segment as a quad
rlSetTexture(texRoad.id);
rlBegin(RL_QUADS);
+ rlColor4ub(255,255,255,255);
+ rlNormal3f(0.0f, 0.0f, 1.0f);
- rlColor4ub(255,255,255,255);
- rlNormal3f(0.0f, 0.0f, 1.0f);
-
- rlTexCoord2f(0, previousV);
- rlVertex2f(prevNegNormal.x, prevNegNormal.y);
-
- rlTexCoord2f(1, previousV);
- rlVertex2f(prevPosNormal.x, prevPosNormal.y);
+ rlTexCoord2f(0, previousV);
+ rlVertex2f(prevNegNormal.x, prevNegNormal.y);
- rlTexCoord2f(1, v);
- rlVertex2f(currentPosNormal.x, currentPosNormal.y);
+ rlTexCoord2f(1, previousV);
+ rlVertex2f(prevPosNormal.x, prevPosNormal.y);
- rlTexCoord2f(0, v);
- rlVertex2f(currentNegNormal.x, currentNegNormal.y);
+ rlTexCoord2f(1, v);
+ rlVertex2f(currentPosNormal.x, currentPosNormal.y);
+ rlTexCoord2f(0, v);
+ rlVertex2f(currentNegNormal.x, currentNegNormal.y);
rlEnd();
// The current step is the start of the next step
@@ -241,19 +231,3 @@ static void DrawTexturedCurve(void)
}
}
-static void UpdateOptions(void)
-{
- if (IsKeyPressed(KEY_SPACE)) showCurve = !showCurve;
-
- // Update with
- if (IsKeyPressed(KEY_EQUAL)) curveWidth += 2;
- if (IsKeyPressed(KEY_MINUS)) curveWidth -= 2;
-
- if (curveWidth < 2) curveWidth = 2;
-
- // Update segments
- if (IsKeyPressed(KEY_LEFT)) curveSegments -= 2;
- if (IsKeyPressed(KEY_RIGHT)) curveSegments += 2;
-
- if (curveSegments < 2) curveSegments = 2;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-16 03:43:11 +0000