imgui-java/example/src/main/java/ExampleImGuizmo.java at main · SpaiR/imgui-java · GitHub

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import imgui.ImGui;

import imgui.extension.imguizmo.ImGuizmo;

import imgui.extension.imguizmo.flag.Mode;

import imgui.extension.imguizmo.flag.Operation;

import imgui.flag.ImGuiCond;

import imgui.flag.ImGuiInputTextFlags;

import imgui.flag.ImGuiKey;

import imgui.flag.ImGuiWindowFlags;

import imgui.type.ImBoolean;

import imgui.type.ImFloat;

import java.awt.Desktop;

import java.net.URI;

import java.util.Arrays;

public class ExampleImGuizmo {

private static final String URL = "https://github.com/CedricGuillemet/ImGuizmo/tree/f7bbbe";

private static final int CAM_DISTANCE = 8;

private static final float CAM_Y_ANGLE = 165.f / 180.f * (float) Math.PI;

private static final float CAM_X_ANGLE = 32.f / 180.f * (float) Math.PI;

private static final float FLT_EPSILON = 1.19209290E-07f;

private static final float[][] OBJECT_MATRICES = {

{

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

0.f, 0.f, 0.f, 1.f

{

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

2.f, 0.f, 0.f, 1.f

{

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

2.f, 0.f, 2.f, 1.f

{

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

0.f, 0.f, 2.f, 1.f

}

};

private static final float[] IDENTITY_MATRIX = {

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

0.f, 0.f, 0.f, 1.f

};

private static final float[] EMPTY = new float[]{0};

private static final float[] INPUT_CAMERA_VIEW = {

1.f, 0.f, 0.f, 0.f,

0.f, 1.f, 0.f, 0.f,

0.f, 0.f, 1.f, 0.f,

0.f, 0.f, 0.f, 1.f

};

private static final float[] INPUT_BOUNDS = new float[]{-0.5f, -0.5f, -0.5f, 0.5f, 0.5f, 0.5f};

private static final float[] INPUT_BOUNDS_SNAP = new float[]{1f, 1f, 1f};

private static final float[] INPUT_SNAP_VALUE = new float[]{1f, 1f, 1f};

private static final float[] INPUT_MATRIX_TRANSLATION = new float[3];

private static final float[] INPUT_MATRIX_SCALE = new float[3];

private static final float[] INPUT_MATRIX_ROTATION = new float[3];

private static final ImFloat INPUT_FLOAT = new ImFloat();

private static final ImBoolean BOUNDING_SIZE = new ImBoolean(false);

private static final ImBoolean USE_SNAP = new ImBoolean(false);

private static int currentMode = Mode.LOCAL;

private static int currentGizmoOperation;

private static boolean boundSizingSnap = false;

private static boolean firstFrame = true;

public static void show(final ImBoolean showImGuizmoWindow) {

ImGuizmo.beginFrame();

if (ImGui.begin("ImGuizmo Demo", showImGuizmoWindow)) {

ImGui.text("This a demo for ImGuizmo");

ImGui.alignTextToFramePadding();

ImGui.text("Repo:");

ImGui.sameLine();

if (ImGui.button(URL)) {

try {

Desktop.getDesktop().browse(new URI(URL));

} catch (Exception e) {

e.printStackTrace();

}

ImGui.separator();

if (firstFrame) {

float[] eye = new float[]{

(float) (Math.cos(CAM_Y_ANGLE) * Math.cos(CAM_X_ANGLE) * CAM_DISTANCE),

(float) (Math.sin(CAM_X_ANGLE) * CAM_DISTANCE),

(float) (Math.sin(CAM_Y_ANGLE) * Math.cos(CAM_X_ANGLE) * CAM_DISTANCE)

};

float[] at = new float[]{0.f, 0.f, 0.f};

float[] up = new float[]{0.f, 1.f, 0.f};

lookAt(eye, at, up, INPUT_CAMERA_VIEW);

firstFrame = false;

}

ImGui.text("Keybindings:");

ImGui.text("T - Translate");

ImGui.text("R - Rotate");

ImGui.text("S - Scale");

ImGui.separator();

if (ImGuizmo.isUsing()) {

ImGui.text("Using gizmo");

if (ImGuizmo.isOver()) {

ImGui.text("Over a gizmo");

}

if (ImGuizmo.isOver(Operation.TRANSLATE)) {

ImGui.text("Over translate gizmo");

} else if (ImGuizmo.isOver(Operation.ROTATE)) {

ImGui.text("Over rotate gizmo");

} else if (ImGuizmo.isOver(Operation.SCALE)) {

ImGui.text("Over scale gizmo");

}

} else {

ImGui.text("Not using gizmo");

}

editTransform(showImGuizmoWindow);

ImGui.end();

}

private static void editTransform(final ImBoolean showImGuizmoWindow) {

if (ImGui.isKeyPressed(ImGuiKey.T)) {

currentGizmoOperation = Operation.TRANSLATE;

} else if (ImGui.isKeyPressed(ImGuiKey.R)) {

currentGizmoOperation = Operation.ROTATE;

} else if (ImGui.isKeyPressed(ImGuiKey.S)) {

currentGizmoOperation = Operation.SCALE;

} else if (ImGui.isKeyPressed(ImGuiKey.LeftShift)) {

USE_SNAP.set(!USE_SNAP.get());

}

if (ImGuizmo.isUsing()) {

ImGuizmo.decomposeMatrixToComponents(OBJECT_MATRICES[0], INPUT_MATRIX_TRANSLATION, INPUT_MATRIX_ROTATION, INPUT_MATRIX_SCALE);

}

ImGui.inputFloat3("Tr", INPUT_MATRIX_TRANSLATION, "%.3f", ImGuiInputTextFlags.ReadOnly);

ImGui.inputFloat3("Rt", INPUT_MATRIX_ROTATION, "%.3f", ImGuiInputTextFlags.ReadOnly);

ImGui.inputFloat3("Sc", INPUT_MATRIX_SCALE, "%.3f", ImGuiInputTextFlags.ReadOnly);

if (ImGuizmo.isUsing()) {

ImGuizmo.recomposeMatrixFromComponents(INPUT_MATRIX_TRANSLATION, INPUT_MATRIX_ROTATION, INPUT_MATRIX_SCALE, OBJECT_MATRICES[0]);

}

if (currentGizmoOperation != Operation.SCALE) {

if (ImGui.radioButton("Local", currentMode == Mode.LOCAL)) {

currentMode = Mode.LOCAL;

}

ImGui.sameLine();

if (ImGui.radioButton("World", currentMode == Mode.WORLD)) {

currentMode = Mode.WORLD;

}

ImGui.checkbox("Snap Checkbox", USE_SNAP);

INPUT_FLOAT.set(INPUT_SNAP_VALUE[0]);

switch (currentGizmoOperation) {

case Operation.TRANSLATE:

ImGui.inputFloat3("Snap Value", INPUT_SNAP_VALUE);

break;

case Operation.ROTATE:

ImGui.inputFloat("Angle Value", INPUT_FLOAT);

float rotateValue = INPUT_FLOAT.get();

Arrays.fill(INPUT_SNAP_VALUE, rotateValue); //avoiding allocation

break;

case Operation.SCALE:

ImGui.inputFloat("Scale Value", INPUT_FLOAT);

float scaleValue = INPUT_FLOAT.get();

Arrays.fill(INPUT_SNAP_VALUE, scaleValue);

break;

}

ImGui.checkbox("Show Bound Sizing", BOUNDING_SIZE);

if (BOUNDING_SIZE.get()) {

if (ImGui.checkbox("BoundSizingSnap", boundSizingSnap)) {

boundSizingSnap = !boundSizingSnap;

}

ImGui.sameLine();

ImGui.inputFloat3("Snap", INPUT_BOUNDS_SNAP);

}

ImGui.setNextWindowPos(ImGui.getMainViewport().getPosX() + 100, ImGui.getMainViewport().getPosY() + 100, ImGuiCond.Once);

ImGui.setNextWindowSize(800, 400, ImGuiCond.Once);

ImGui.begin("Gizmo", showImGuizmoWindow);

ImGui.beginChild("prevent_window_from_moving_by_drag", 0, 0, false, ImGuiWindowFlags.NoMove);

float aspect = ImGui.getWindowWidth() / ImGui.getWindowHeight();

float[] cameraProjection = perspective(27, aspect, 0.1f, 100f);

ImGuizmo.setOrthographic(false);

ImGuizmo.enable(true);

ImGuizmo.setDrawList();

float windowWidth = ImGui.getWindowWidth();

float windowHeight = ImGui.getWindowHeight();

ImGuizmo.setRect(ImGui.getWindowPosX(), ImGui.getWindowPosY(), windowWidth, windowHeight);

ImGuizmo.drawGrid(INPUT_CAMERA_VIEW, cameraProjection, IDENTITY_MATRIX, 100);

ImGuizmo.setID(0);

ImGuizmo.drawCubes(INPUT_CAMERA_VIEW, cameraProjection, OBJECT_MATRICES[0]);

if (USE_SNAP.get() && BOUNDING_SIZE.get() && boundSizingSnap) {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0], null, INPUT_SNAP_VALUE, INPUT_BOUNDS, INPUT_BOUNDS_SNAP);

} else if (USE_SNAP.get() && BOUNDING_SIZE.get()) {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0], null, INPUT_SNAP_VALUE, INPUT_BOUNDS);

} else if (BOUNDING_SIZE.get() && boundSizingSnap) {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0], null, EMPTY, INPUT_BOUNDS, INPUT_BOUNDS_SNAP);

} else if (BOUNDING_SIZE.get()) {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0], null, EMPTY, INPUT_BOUNDS);

} else if (USE_SNAP.get()) {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0], null, INPUT_SNAP_VALUE);

} else {

ImGuizmo.manipulate(INPUT_CAMERA_VIEW, cameraProjection, currentGizmoOperation, currentMode, OBJECT_MATRICES[0]);

}

float viewManipulateRight = ImGui.getWindowPosX() + windowWidth;

float viewManipulateTop = ImGui.getWindowPosY();

ImGuizmo.viewManipulate(INPUT_CAMERA_VIEW, CAM_DISTANCE, viewManipulateRight - 128, viewManipulateTop, 128, 128, 0x10101010);

ImGui.endChild();

ImGui.end();

}

private static float[] perspective(float fovY, float aspect, float near, float far) {

float ymax, xmax;

ymax = (float) (near * Math.tan(fovY * Math.PI / 180.0f));

xmax = ymax * aspect;

return frustum(-xmax, xmax, -ymax, ymax, near, far);

}

private static float[] frustum(float left, float right, float bottom, float top, float near, float far) {

float[] r = new float[16];

float temp = 2.0f * near;

float temp2 = right - left;

float temp3 = top - bottom;

float temp4 = far - near;

r[0] = temp / temp2;

r[1] = 0.0f;

r[2] = 0.0f;

r[3] = 0.0f;

r[4] = 0.0f;

r[5] = temp / temp3;

r[6] = 0.0f;

r[7] = 0.0f;

r[8] = (right + left) / temp2;

r[9] = (top + bottom) / temp3;

r[10] = (-far - near) / temp4;

r[11] = -1.0f;

r[12] = 0.0f;

r[13] = 0.0f;

r[14] = (-temp * far) / temp4;

r[15] = 0.0f;

return r;

}

private static float[] cross(float[] a, float[] b) {

float[] r = new float[3];

r[0] = a[1] * b[2] - a[2] * b[1];

r[1] = a[2] * b[0] - a[0] * b[2];

r[2] = a[0] * b[1] - a[1] * b[0];

return r;

}

private static float dot(float[] a, float[] b) {

return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];

}

private static float[] normalize(float[] a) {

float[] r = new float[3];

float il = (float) (1.f / (Math.sqrt(dot(a, a)) + FLT_EPSILON));

r[0] = a[0] * il;

r[1] = a[1] * il;

r[2] = a[2] * il;

return r;

}

private static void lookAt(float[] eye, float[] at, float[] up, float[] m16) {

float[] x;

float[] y;

float[] z;

float[] tmp = new float[3];

tmp[0] = eye[0] - at[0];

tmp[1] = eye[1] - at[1];

tmp[2] = eye[2] - at[2];

z = normalize(tmp);

y = normalize(up);

tmp = cross(y, z);

x = normalize(tmp);

tmp = cross(z, x);

y = normalize(tmp);

m16[0] = x[0];

m16[1] = y[0];

m16[2] = z[0];

m16[3] = 0.0f;

m16[4] = x[1];

m16[5] = y[1];

m16[6] = z[1];

m16[7] = 0.0f;

m16[8] = x[2];

m16[9] = y[2];

m16[10] = z[2];

m16[11] = 0.0f;

m16[12] = -dot(x, eye);

m16[13] = -dot(y, eye);

m16[14] = -dot(z, eye);

m16[15] = 1.0f;

}

imgui-java/example/src/main/java/ExampleImGuizmo.java at main · SpaiR/imgui-java · GitHub

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